&#x27;If you put Sharon and Louis in the house, that’s what you pay them for, they’re going to be controversial,&#x27; Cowell has said. | ITV National News

Simon Cowell responds to public feud between Sharon Osbourne and Amanda Holden | ITV News

Simon Cowell believes Sharon Osbourne and Louis Walsh are simply hiding some other emotions behind their hateful words. After Sharon and Louis, both 71, mocked their X Factor boss during their...

Simon Cowell reveals real reason behind feud with Sharon Osbourne, Louis Walsh | Entertainment | thenews.com.pk

Osbourne recently hit back at comments made by Holden about how she felt ‘The X Factor’ mogul had aided their careers

Simon Cowell addresses Sharon Osbourne’s feud with Amanda Holden | The Independent

Simon Cowell has addressed his rift with Sharon Osbourne and Louis Walsh after their shocking Celebrity Big Brother rant.

Simon Cowell addresses rift with Sharon Osbourne and Louis Walsh | Metro News

EXCLUSIVE: Simon Cowell breaks his silence on Sharon Osbourne and Amanda Holden&#x27;s explosive online feud and says he plans to reach out to calm the storm

Simon Cowell vows to heal rift with Sharon Osbourne and Louis Walsh after Amanda Holden spat - Mirror Online

They might not be Bette Davis and Joan Crawford, but the X Factor judges’ ding-dong over Simon Cowell is a joy

Digested week: May Sharon Osbourne and Amanda Holden’s spat keep on giving | Lucy Mangan | The Guardian

SharyCo

sharyco

For many, using a mock of a third-party service in tests is a common thing. The code's response to a specific response (HTTP code and body) is checked. But how often do you check what request your application makes to this very third-party service? After all, the mock will return the desired response for any request body. Python I'm really keen on writing tests. Moreover, I often use TDD. For me, it is important to cover the code with tests as much as possible. I often study other people's projects and see gaps not only in the tests but also in the code itself. And these gaps go into production. It happens because sometimes, we forget about some details. In addition to checking requests to third-party services, these include, for example, migration testing, transaction rollbacks, etc… Now, I will show you some examples of how you can verify requests to third-party services in tests. I will do it using the example of async + . However, , , and even have a similar set of methods for verification. FastAPI httpx aiohttp requests Django The main task is to compare the request that our application sent to the stub. If it is different, then we need to return an error in the test. At the same time, a correct request may often have a different visual representation, so just comparing the request body with the template will not work. I compare dict or list as it's more flexible. As an example, let's take the following simple application: import httpx
from fastapi import FastAPI

app = FastAPI()
client = httpx.AsyncClient()


@app.post("/")
async def root():
    result1 = await client.request(
        "POST",
        "http://example.com/user",
        json={"name": "John", "age": 21},
    )
    user_json = result1.json()
    result2 = await client.request(
        "POST",
        "http://example1.com/group/23",
        json={"user_id": user_json["id"]},
    )
    group_json = result2.json()
    return {"user": user_json, "group": group_json} This application makes two consecutive requests. For the second request, it uses the result from the first one. In both cases, when using standard mocks, our application can send an absolutely invalid request and will still receive the desired mock response. So, let's see what we can do about it. Test without checking requests The most popular package for sending requests to third-party services is . I usually use as mocks, and for , I often use . httpx pytest_httpx aiohttp aiorequests A simple test to check this endpoint looks something like this: import httpx
import pytest
import pytest_asyncio
from pytest_httpx import HTTPXMock
from app.main import app

TEST_SERVER = "test_server"


@pytest_asyncio.fixture
async def non_mocked_hosts() -> list:
    return [TEST_SERVER]


@pytest.mark.asyncio
async def test_success(httpx_mock: HTTPXMock):
    httpx_mock.add_response(
        method="POST",
        url="http://example.com/user",
        json={"id": 12, "name": "John", "age": 21},
    )
    httpx_mock.add_response(
        method="POST",
        url="http://example1.com/group/23",
        json={"id": 23, "user_id": 12},
    )
    async with httpx.AsyncClient(app=app, base_url=f"http://{TEST_SERVER}") as async_client:
        response = await async_client.post("/")
    assert response.status_code == 200
    assert response.json() == {
        'user': {'id': 12, 'name': 'John', 'age': 21},
        'group': {'id': 23, 'user_id': 12},
    } For requests to the endpoint of the application, we also use . Not to accidentally mock it, we add the non_mocked_hosts fixture. And in the test, we add two mocks using . Method and URL are used as matchers here. If the request with the mocked URL and method is not called before the test ends, we will get an error. httpx.AsyncClient httpx_mock.add_response Now, let's try to do something to ensure that the request body is the one that the external service expects. The first option is built into httpx_mock. We can add content - this is a byte object of the full request text. httpx_mock.add_response(
    method="POST",
    url="http://example.com/user",
    json={"id": 12, "name": "John", "age": 21},
    content=b'{"name": "John", "age": 21}',
) In this case, during the search, not only the method and URL will be compared, but also this very content. But, as I mentioned above, we definitely need to know the request body. A discrepancy in any character will result in an error. For example, a space between a colon and a key, a line transition and any formatting details, or just a different order of keys in the dictionary. This way of testing JSON is very inefficient. However, the package does not have a built-in regular validator of requests in . JSON format Simple method Getting requests at the end of the test and comparing them with the templates seems to be the easiest way. import json

import httpx
import pytest
import pytest_asyncio
from pytest_httpx import HTTPXMock
from app.main import app

TEST_SERVER = "test_server"


@pytest_asyncio.fixture
async def non_mocked_hosts() -> list:
    return [TEST_SERVER]


@pytest.mark.asyncio
async def test_with_all_requests_success(httpx_mock: HTTPXMock):
    httpx_mock.add_response(
        method="POST",
        url="http://example.com/user",
        json={"id": 12, "name": "John", "age": 21},
    )
    httpx_mock.add_response(
        method="POST",
        url="http://example1.com/group/23",
        json={"id": 23, "user_id": 12},
    )
    async with httpx.AsyncClient(app=app, base_url=f"http://{TEST_SERVER}") as async_client:
        response = await async_client.post("/")
    assert response.status_code == 200
    assert response.json() == {
        'user': {'id': 12, 'name': 'John', 'age': 21},
        'group': {'id': 23, 'user_id': 12},
    }
    expected_requests = [
        {"url": "http://example.com/user", "json": {"name": "John", "age": 21}},
        {"url": "http://example1.com/group/23", "json": {"user_id": 12}},
    ]
    for expecter_request, real_request in zip(expected_requests, httpx_mock.get_requests()):
        assert expecter_request["url"] == real_request.url
        assert expecter_request["json"] == json.loads(real_request.content) This method is quite huge and requires repeating the code. More complex method I decided to fix the package a bit. I could have created a child class by overriding the necessary methods, but I created a slightly different layer. To do this, I added the class: APIMock from typing import Any
import httpx
import json
from pytest_httpx import HTTPXMock


class APIMock:
    def __init__(self, httpx_mock: HTTPXMock):
        self.httpx_mock = httpx_mock

    async def request_mock(
        self,
        method: str,
        url: str,
        status_code: int = 200,
        request_for_check: Any = None,
        **kwargs,
    ):
        async def custom_response(request: httpx.Request) -> httpx.Response:
            response = httpx.Response(
                status_code,
                **kwargs,
            )
            if request_for_check:
                assert request_for_check == json.loads(request.content), \
                    f"{request_for_check} != {json.loads(request.content)}"
            return response
        self.httpx_mock.add_callback(custom_response, method=method, url=url) There is only one public method in this class. It adds the mock by calling from . add_callback httpx_mock Its structure is from the original from method, but it is a bit shorter. If you need more parameters, you can always add them. add_response httpx_mock To use it, it is enough to import it through a fixture and call instead . add_request Below is an example of a test using the class and request verification. APIMock import httpx
import pytest
import pytest_asyncio
from pytest_httpx import HTTPXMock
from app.main import app
from app.api_mock import APIMock

TEST_SERVER = "test_server"


@pytest_asyncio.fixture
async def non_mocked_hosts() -> list:
    return [TEST_SERVER]


@pytest_asyncio.fixture
async def requests_mock(httpx_mock: HTTPXMock):
    return APIMock(httpx_mock)


@pytest.mark.asyncio
async def test_with_requests_success(requests_mock):
    await requests_mock.request_mock(
        method="POST",
        url="http://example.com/user",
        json={"id": 12, "name": "John", "age": 21},
        request_for_check={"name": "John", "age": 21},
    )
    await requests_mock.request_mock(
        method="POST",
        url="http://example1.com/group/23",
        json={"id": 23, "user_id": 12},
        request_for_check={"user_id": 12},
    )
    async with httpx.AsyncClient(app=app, base_url=f"http://{TEST_SERVER}") as async_client:
        response = await async_client.post("/")
    assert response.status_code == 200
    assert response.json() == {
        'user': {'id': 12, 'name': 'John', 'age': 21},
        'group': {'id': 23, 'user_id': 12},
    } It looks quite simple and convenient. The structure allows you to specify the expected request while creating a mock as when using . I found this method to be the most convenient one. Moreover, other classes can be inherited from this one, and they will mock each specific endpoint to a third-party service. This is very convenient. content The same can be done for the package as well as for . They also support the function. aioresponses responses callback In theory, you will have to write a test for such a test since it’s quite logical. But this is not a problem since we have a separate class. Conclusion Both these methods have advantages and disadvantages. First method Advantages of the simple method: There is no need to change or add anything to the mock. Everything is out of the box. The order of requests is checked. Disadvantages of the simple method: You have to repeat the verification code in each test. You have to maintain a list of all requests for each test. In case of parallel requests, there may be a violation of the order. Second method Advantages of the second method: Minimum code and repeatability. You can conveniently and concisely implement the mock of each endpoint. Disadvantages of the second method: The request order is not verified. I use both methods in tests. What suits you best for each specific situation is up to you. The examples are here: https://github.com/sharypoff/check-mocks-httpx

Python: Checking API Application Requests to Third-Party Services

Optimize Data Migration in MongoDB: Resharding Techniques for Speed and Scalability

মঙ্গোডিবিতে ডেটা মাইগ্রেশন অপ্টিমাইজ করুন: গতি এবং স্কেলেবিলিটির জন্য রিশার্ডিং টেকনিক

Optimieren Sie die Datenmigration in MongoDB: Resharding-Techniken für Geschwindigkeit und Skalierbarkeit

Optimice la migración de datos en MongoDB: técnicas de fragmentación para velocidad y escalabilidad

Optimiser la migration des données dans MongoDB : techniques de repartitionnement pour la vitesse et l'évolutivité

MongoDB में डेटा माइग्रेशन को ऑप्टिमाइज़ करें: स्पीड और स्केलेबिलिटी के लिए रीशेयरिंग तकनीक

MongoDB でのデータ移行の最適化: 速度とスケーラビリティのためのリシャーディング手法

MongoDB에서 데이터 마이그레이션 최적화: 속도와 확장성을 위한 리샤딩 기술

Otimize a migração de dados no MongoDB: técnicas de resharding para velocidade e escalabilidade

MongoDB'de Veri Geçişini Optimize Edin: Hız ve Ölçeklenebilirlik için Yeniden Paylaşım Teknikleri

Tối ưu hóa quá trình di chuyển dữ liệu trong MongoDB: Kỹ thuật chia lại cấu trúc cho tốc độ và khả năng mở rộng

优化 MongoDB 中的数据迁移：用于速度和可扩展性的重新分片技术

Gaming tokens skyrocketed this summer, and it has become one of the most notable events in the crypto industry. For example, the AXS token of the blockchain game Axie Infinity demonstrated the most considerable increase by more than 1500% in three months, breaking into the top 50 assets in terms of capitalization and making it to global financial media. So what is happening in the blockchain gaming industry, and what should we expect in the future? Blockchain in the gaming industry Blockchain technologies have been penetrating the gaming industry since 2014, when the first online casinos began accepting deposits in bitcoins. With the advent of non-fungible tokens (NFTs), it has become possible to create games where players can be rightful owners of in-game characters and objects. In turn, the emergence of in-game property entails commercial relationships. In 2017, the project CryptoKitties proved the possibility to make money in online games when their NFT kittens were sold for tens of thousands of dollars. The large audience of game developers and players formed in 2021, building a whole market segment - GameFi (Game Finance). The terminology was offered by well-known developer Andre Cronje and embraces a variety of game projects built on blockchain and using NFTs. The GameFi sector comprises the categories: -NFT games of various genres, using Free2Play and Play2Earn models -Metaverses -Projects providing tools for the development and distribution of NFT games and switching the existing online games to the blockchain -Projects that enable using NFTs in DeFi services. The games created in 2020 and earlier were mainly built on the Ethereum blockchain. However, too high fees forced the developers to switch to cheaper and faster blockchains. Many games are built on Wax, EOS, Tron. Binance Smart Chain is also gaining momentum in the game industry from early 2021. Specialized blockchain platforms like Flow are explicitly developed for the game industry and issue NFTs. Popular NFT games Since early 2021, the number of NFT games has grown exponentially. The Playtoearn.net rating alone counts over 360 online  Free2Play and Play2Earn games, featuring NFTs and enabling them to earn cryptocurrencies. They embrace all known game genres - from card games to economic simulators, strategies, arcades, races. One of the most notable projects is the RPG game , developed by Riveted Games. Not only because it got unexpectedly popular (90 thousand players per day), but also because the skyrocketed from $1.05 to $184 in July 2021. Even after a deep correction, the asset was trading at around $40. CryptoBlades SKILL in-game token Like the entire crypto industry, GameFi borrows solutions that have proven successful. For example, the NFT game My DeFi Pet, powered by the BSC blockchain, is very similar to Axie Infinity, for it implies growing and breeding pets. However, the mechanics of pets' characteristics and the whole gameplay are more straightforward. In July, the demonstrated a tenfold growth - the game attracted more than 30,000 players a day, but it had dropped tenfold by the end of the summer. DPET gaming token Some NFT games have not been released yet, but their tokens are already traded on leading exchanges, and some even made it to the top 200 by capitalization. For example, , a sandbox/social simulation multiplayer blockchain game developed by Antler Interactive. The game's release is scheduled for spring 2022, but the ALICE token launched on Binance Launchpool in March 2021 has already reached a capitalization of over $300 million. My Neighbor Alice Same thing with the It is a decentralized RPG with an NFT collection that will run on the Ethereum network. The ILV token reached a capitalization of over $250 million even before the game's release. This was greatly facilitated by staking with more than 85% annual yield. ILV holders were able to earn both on staking and on the growth of the rate. Staking rewards paid in ILV tokens are locked up for 12 months, protecting the token price from selling pressure. Illuvium project. Virtual land in metaverses Virtual worlds or metaverses are a particular category of NFT games, where players can own digital items and land in the form of NFTs and use them within the game economy. The most well-known tokenized virtual world is Decentraland. This project development started back in 2015, and the public release took place only in early 2020. More than 45 thousand digital plots of land were sold at auctions in 2017-2018, each of which was connected with an ERC-721 format LAND token that confirmed the right of possession. Now plots can only be bought on the secondary market. In November 2021, Decentraland’s took place: Token.com via its subsidiary Metaverse Group acquired 116 plots of land of 6090 square feets for 2.4M$. largest digital real estate deal The plots of land in Decentraland are used for various purposes. The land is rented out; it is used to construct virtual buildings, mini-games, casinos, shopping centers with NFT stuff, and advertising platforms. Decentraland is governed by DAO: the owners of LAND plots and the MANA token have the right to vote. Interestingly, the value of the MANA token has long gone beyond Decentraland - it is used as collateral for loans on the MakerDAO DeFi platform. Other well-known virtual worlds also have their tokenized land markets and native currencies, such as (an analog of MineCraft on the blockchain with the SAND in-game token) and (with support for 3D glasses and the CUBE token). SANDBox Somnium Space also introduced the ability to own land in a virtual world called The Lunacian in early 2021. Its territory is divided into 90,601 land plots connected with an NFT. The plots of land can be used to collect game resources and hold PvE battles. In February 2021, the most expensive NFT plot was bought for $1.5 million. The cheapest plots on The Lunacian are now sold on the Axie Infinity marketplace for $12,000. Axie Infinity To date, the most popular metaverse with a digital real estate market is Alien Worlds, built on the . According to DappRadar, as of August 2021, more than 400 thousand players entered this metaverse daily. The beauty of the game is that it does not require an initial investment, unlike Axie Infinity and other Play2Earn games. A beginner receives a basic set of tools for mining Trilium game tokens (TLM) which can be withdrawn and sold on crypto exchanges. Players can purchase land on planets in the Alien Worlds metaverse, receiving their share of the tokens generated by the planet daily, as well as fees from all players who mine TLM on the plot. WAX blockchain With the growing popularity of NFT games and metaverses, GameFi infrastructure adapted to the needs of developers, players, and investors. Here are some of the most exciting projects in this sector. SharkRace Club SharkRace Club is a new project which integrates the two NFT worlds: collectible NFT art and GameFi. Providing both utility and fun for its users, the play-to-earn Metaverse RPG Game is built on the Unreal Engine 4 and unveils breath-taking races in the ocean of intelligent and merciless NFT meta-sharks built on BSC. The game stands out by many points such as premium 3D graphics, top-quality gameplay design with the upcoming VR module and few great monetization models such as earning money with zero input just by selling in-game artifacts which you have gained through the race. Group tournaments with prize fund, and ability to initiate your own team-play with bids are also available.The game has many customization services, boosters and artifacts. The project developers have extensive experience in blockchain, having successfully launched Tizer crypto wallet - its infrastructure is integrated into the Game App, making it easy to enter regardless of previous experience with crypto. SharkRace is a club system. If you purchase a collectible NFT from the exclusive 20,001 NFT Sharks collection, you receive 3 gaming meta-sharks and a game gift card for free. You’re also provided with grant in project tokens SharkCoins, lifelong airdrop eligement, voting rights and staking preferences. Alternatively, gaming meta-sharks could be bought on the SharkRace marketplace. The game rolls out in April 2022 with single-play first, and it is expected to become the next global gaming sensation. The SharkRace Club is taking place on the 3rd of March 2022. IDO Enjin Since 2017, Enjin has been creating a platform that helps developers transfer existing and new online games to the blockchain and release game items in the form of NFTs. In 2020, they launched the Enjin Adopter program, which attracted dozens of game developers, helping them create, finance, monetize, and sell their projects on the blockchain. To date, several online games are running on the Enjin platform: Lost Relics, 9lives Arena, Space Misfits, The Six Dragons, etc. In the spring of 2021, to avoid the restrictions of the Ethereum network, the company launched its Efinity blockchain with a native EFI coin. The new network provides throughput  up to 1,000 transactions per second and has its own NFT standard. Supposedly, all game projects built on the Enjin platform will work on this blockchain. Ultra Games Ultra Games is another project from this sector. It was built as a decentralized and cheap alternative to platforms like Steam or the Google Play Store that take 30% of developers’ income. To date, it grew into an entire ecosystem based on Ultra Games. It includes a platform for developing and distributing games based on the blockchain and tools for monetizing the gameplay and creating decentralized marketplaces for trading virtual goods, a back office for developers, and much more. In June 2021, they launched the Ultra network (EOS fork) with the native UOS coin, which enables free and fast transactions. This network has its Ultra NFT standard and an Ultra Wallet enabling the exchange of crypto assets across the networks. Gala Games Gala Games is a developer of NFT games. So far, only one Town Star game (city simulator) is available for players, but the company plans to release several more games in different genres that will use the same NFT items. In addition, there is a single store for NFT items for all players, with prices in GALA tokens. Thus, a whole ecosystem with a single economy is formed from games in different genres. GALA is the governance token, and its holders can vote for the introduction of Gala NFT Games made by other developers. This will help middle developer teams to distribute their games and draw players to their projects. Yield Guild Games This decentralized DAO gaming guild is engaged in investments in in-game NFTs and metaverses. The project got support from venture capital funds Delphi Digital and Andreessen Horowitz. The IDO took place in July 2021 and, as of the end of August, provided token sale participants with over 3,500% yield, while the capitalization of the YGG governance token exceeded $900 million. Not only do YGG holders participate in project management, but they also receive part of the income from operations with NFT assets, for example, from the sale or rental of game items, virtual land, etc. The project focuses on digital asset management in three popular games: Axie Infinity, Sandbox, and League of Kingdoms. In Axie Infinity, the project already owns several thousand Axies and rents them out to Filipino players, receiving 30% of the SLP tokens they earn. GameFi prospects Many experts believe the GameFi segment has a promising future. Developers get new tools for distributing and monetizing games, while millions of players worldwide receive the opportunity to play and earn. The financial success of Axie Infinity inspired hundreds of teams worldwide to release NFT games in various genres, so we expect numerous exciting releases in 2022.

GameFi Sector And The Most Up-And-Coming Gaming Platforms

Python for Data Science: How to Scrape Website Data via the Internet's Top 300 APIs

Problem statement Since AWS doesn’t support auto-scaling for kinesis streams most of the time we either over provision the shards and pay more or under provision them and taking a hit on the performance. Solution: Using a combination of cloud watch alarms, SNS topics and Lambda we can implement auto-scaling for kinesis streams through which we can manage the shard count and hitting the right balance between cost and performance. Overview of the solution: Both scale up and scale down by implemented by monitoring “PutRecords.Bytes” metrics of the stream: Scale up (doubling of shards) will automatically happen once the stream is utilized more than 80% of its capacity at least once in the given 2 minutes rolling window.Scale down (reducing the shards into half) will automatically happen once the stream is not utilized more than 40% of its capacity at least 3 times in the given 5 minutes rolling window Note: We can also use “IncomingBytes” or “IncomingRecords” to implement the same. We scale up really quick so we don’t take a hit on performance and scale down slowly so we can avoid too many scale up and scale down operations. Implementation details: Determine % of utilization for kinesis streams: Lets say: Payload size = 100 KB Total records (per second) = 500 AWS recommended shard count = 49 To determine whether its 80% utilized we do the following: Total bytes max can be written in 2 minutes = (((100 * 500)*60)*2) = 6,000,000 KB 80% of it would be = 4,800,000 KB Similarly 40% of it would be 2,400,000 KB Scale out The below diagram shows the flow when we perform a scale out operation Configuration for “Scale out alarm” would be: Metric Name: PutRecord.Bytes Stream Name: ETL Kinesis stream Period: 2 minutes Threshold >= 4800000Datapoints: 1 Statistic: Sum Action: Notify topic “Scale SNS topic” So when we reach 80% of the stream capacity the following happens: Cloud watch alarm “Scale out alarm” will be triggered Notification is sent to SNS topic “Scale SNS topic” which triggers “Scale out lambda” Lambda will scale the number of shards = current shards * 2 and update the threshold to the based on the new shard count. Let’s say the new shard count is “98”, then Max bytes that can be written in 2 minutes (100 KB * 1000 records) = 12,000,000 KB 80% of it would be 9,600,000 KB 40% of it would be 4,800,000 KB Reset the “Scale out alarm” back to “OK” state from “ALARM” state Scale in The below diagram shows the flow when we perform a scale in operation Note: 40% value is calculated for 15 minute interval = (100*1000*15*60)*40/100 = 36,000,000 Configuration for “Scale in alarm” would be: Metric Name: PutRecord.Bytes Stream Name: ETL Kinesis stream Period: 15 minutes Threshold <= 36000000 Datapoints: 3 Statistic: Sum Action: Notify topic “Scale in SNS topic” So when we utilize only 40% of the stream capacity the following happens: Cloud watch alarm “Scale in alarm” will be triggered Notification is sent to SNS topic “Scale in SNS topic” which triggers “Scale in lambda” Lambda will scale the number of shards = current shards / 2 and update the threshold to the based on the new shard count. Reset the “Scale in alarm” back to “OK” state from “ALARM” state Lambda (scale out) The attached code “Lambda.js” is written in nodeJs and just for demo purpose so instead of dynamically calculating the threshold value its hardcoded, but the same code can be enhanced to determine all of things mentioned in this post Environment variables: ALARM_NAME = “Scale out alarm” MAX_SHARDS = 100 MIN_SHARDS = 10 STREAM_NAME = “ETL Kinesis stream” Pseudo code: Describe the stream and only continue if the stream is not “UPDATING” (if previous scale up/down action has not completed) Calculate the new shardCount Update the cloudwatch alarm threshold using “putMetricAlarm()” Update the shard count using “updateShardCount()” Wait for shard scale up or scale down operation to complete using “describeStream()” (not implemented in the current code) then reset the state of the alarm to “OK” state using “setAlarmState()” COGS reduction: In order to get 1000 TPS for payload of record size 100KB we need to pay 1223.62$, by this approach we can control scale up and scale down which directly reduces the cost of these AWS resources I am happy to take any feedback or improvements to this approach, thanks for reading it. Previously published at https://medium.com/@hariohmprasath/autoscaling-with-kinesis-stream-cogs-reduction-dfd87848ce9a

Methodology Of Autoscaling For Kinesis Streams

...for Better Code Separation What is this Model, View, Controller (MVC) architectural pattern? Sources: Rails Documentation The architecture divides your code into three (3) layers , and separating the different responsibilities of the program. MVC Models Views Controllers Image from Wikipedia Model Layer This layer in contains the domain model, which generally represents a specific object class (e.g. a Person, Animal, Books). This is where the is usually handled since this model is linked to the and its data is derived from the relative table’s rows. Ruby on Rails business logic database View Layer Handles the representations of the responses provided by the controllers. Since the controller can return information as HTML, XML, JSON, etc. visual Controller Layer In this layer is responsible for with the , its and providing suitable responses to various requests. Rails interacting model manipulating data HTTP Now, what would this MVC pattern look like in JavaScript? Source: MDN web docs Since generally does not involve the use of databases (although it could), nor HTTP request handling (Once again it could), the pattern will have to be tweaked a bit to fit the language specificity. JavaScript MVC Image from MDN Model Layer The can literally be as simple as an but usually it would be a . An application can have and these classes (models) would contain the needed for the app to function. model layer array class multiple models basic data Take for instance a which tracks which classes a person is taking. The models in this case can be divided into classes such as a Classroom, Person and an Array based model called Subjects. E.G. Classroom App Base Model Classes { (id, subject = 'Homeroom') { .id = id; .persons = []; .subject = subject;
  }
} class Classroom constructor this this this The contains data variables which will hold information for each classroom. This would be a list of all the currently enrolled in this classroom, the associated with this classroom and it's . Classroom model persons subject ID { (id, firstN = 'John', lastN = 'Doe') { .id = id; .firstName = firstN; .lastName = lastN; .subjects = []; .classrooms = [];
  }
} class Person constructor this this this this this The contains data variables which will hold information for each person. This would be their and , the that they are studying and which they are apart of. Person model first last name subjects classrooms subjects = [ , , , , , ]; const "English" "Math" "Computer Science" "Business" "Finance" "Home Economics" The will simply be an array, since for this example I have no intention in allowing the subjects model to be manipulated. Subjects model Controller Layer The controller would be a class which translates the user input into changes to the model's data. In the – the controller receives user input from view elements such as text input or select options and button clicks which is used to modify the model. E.G. Classroom App classroomModel ; { () { .lastID = ; .classrooms = []; .selectedClass = ;
  }

  selectClassroom(classroomID) { .selectedClass = .classrooms
    .filter( c.id === (classroomID, ))[ ];
  }

  addClassroom(subject) { .classrooms.push( classroomModel( .lastID, subject)
      ); .lastID += ;
  }

  removeClassroom(classroomID) { .classrooms = .classrooms
      .filter( c.id !== (classroomID, ));
  }

  setSubject(subject, classroomID) { classroom = .classrooms
      .filter( c.id === (classroomID, ))[ ];
    classroom.subject = subject;
  }

  addPerson(person, classroom) { (!person) ;
    classroom.addPerson(person);
  }

  removePerson(person, classroomID) { classroom = .classrooms
    .filter( c.id === (classroomID, ))[ ];
    classroom.removePerson(person);
  }
} import from "../models/classroom" class ClassroomController constructor this 0 this this null this this => c parseInt 10 0 this new this this 1 this this => c parseInt 10 const this => c parseInt 10 0 // const classroom = this.classrooms // .filter(c => c.id === parseInt(classroomID, 10))[0]; if return const this => c parseInt 10 0 The in this case could be seen as a in reference to how operates and each row in this "Table" would be information linked to each classroom object already created. classroom controller Table Rails This controller has variables of its own, " " (Every time a classroom object is created and added to the classrooms array this variable's value increments), " " (an array of all created classroom objects) and " ". three lastID classrooms selectedClass View Layer This layer handles the representation of the app’s data. This layer contains classes which allows the to see and with the . visual User interact data In the – the view would provide elements such as , and (<div/>, <span/ >, <p/>…etc.) to display the various persons and classrooms and their related data. E.G. Classroom App ( ) Document Object Model DOM Buttons Inputs containers classroomController ; subjects ; { (appDiv) { .classroomController = classroomController(); .classroomSectionDiv = .createElement( ); .classroomsDiv = .createElement( ); .addclassBtn = .createElement( ); .selectSubjectInput = .createElement( ); .classroomSectionDiv.classList.add( ); .classroomsDiv.classList.add( ); .selectSubjectInput.innerHTML = subjects.map( ( )); .addclassBtn.textContent = ; .addclassBtn.addEventListener( , () => .addClassroom()); .classroomSectionDiv.append( .classroomsDiv, .selectSubjectInput, .addclassBtn,
      );
    appDiv.appendChild( .classroomSectionDiv);
  }

  updateView() { { classroomController, classroomsDiv } = ; allClassrooms = classroomController.classrooms.map( { removeBtn = .createElement( ); classDiv = .createElement( );
        classDiv.classList.add( ); (classroomController.selectedClass === c) {
          classDiv.classList.add( );
        }
        classDiv.addEventListener( , () => .selectClassroom(classDiv.getAttribute( )));
        classDiv.setAttribute( , c.id);
        removeBtn.addEventListener( , () => .removeClassroom(removeBtn.getAttribute( )));
        removeBtn.setAttribute( , c.id);
        removeBtn.classList.add( );
        removeBtn.textContent= ; allPersons = c.persons.map( ( ));
        classDiv.innerHTML = ;
        classDiv.appendChild(removeBtn); classDiv;
      }
    );
    classroomsDiv.innerHTML= ;
    allClassrooms.map( classroomsDiv.append(div));
  }
  
  selectClassroom(classroomID) { { classroomController } = ;
    classroomController.selectClassroom(classroomID); .updateView();
  }

  addClassroom() { {
      classroomController,
      selectSubjectInput,
    } = ; subjectChosen = selectSubjectInput.value;
    classroomController.addClassroom(subjectChosen); .updateView();
  }

  removeClassroom(classroomID) { { classroomController } = ;
    classroomController.removeClassroom(classroomID); .updateView();
  }

  addPerson(person, classroomID) { { classroomController } = ;
    classroomController.addPerson(person, classroomID); .updateView();
  }
} import from "../controllers/classroom" import from "../models/subjects" class ClassroomView constructor this new this document 'div' this document 'div' this document 'button' this document 'select' this 'classroom-section' this 'classroom-container' this ( ) => option, index `<option key= value= > </option>` ${index} ${option} ${option.toUpperCase()} this 'New Class' this 'click' this this this this this this const this const => c const document 'button' const document 'div' 'classroom' if 'selected' 'click' this 'data-classroom-id' 'data-classroom-id' 'click' this 'data-classroom-id' 'data-classroom-id' 'remove-btn' 'remove' const => p `<div class="person-inline">
            <span class="fname"> </span>
            <span class="lname"> </span>
            <span class=" "> </span>
          </div>` ${p.firstName} ${p.lastName} ${p.occupation} ${p.occupation} `<div class="m-b">
            <span class="id"> </span>
            <span class="subject"> </span></div>
            <div class="all-persons"> </div>` ${c.id} ${c.subject} ${allPersons.join( )} '' return '' => div const this this const this const this const this this const this this The class contains a variable that links to a which is created upon construction. This allows communication with the controller from the view. ClassroomView ClassroomController The function is ran after every change as a result from user Interactions. This function simply updates all related view elements with the appropriate data obtained from the associated model. updateView() DOM All functions within the view simply grab values from the ( elements and transfer them as variables to the controller's functions. The functions , and are all added to the elements via the function as events through the function. User Interface UI) DOM selectClassroom() addClassroom() removeClassroom() DOM updateView() addEventListener() Accessing all controllers and views through a single view Now, since for this example we have two controllers, a and a ( ). We would also have two views and if we wanted these two views to be able to interact with one another we would create a single overarching view. We could call this view the . Classroom Controller Person Controller Shown in full project Application View classroomView ; personView ; { (appDiv) { .classroomView = classroomView(appDiv); .personView = personView(appDiv); .addPersonToClassBtn = .createElement( ); .addPersonToClassBtn.textContent = ; .addPersonToClassBtn.addEventListener( , () => .addPersonToClass());
    appDiv.appendChild( .addPersonToClassBtn);
  }

  addPersonToClass() { { classroomView, personView } = ; { classroomController } = classroomView; { personController } = personView; selectedClassroom = classroomController.selectedClass; selectedPerson = personController.selectedPerson;
    classroomView.addPerson(selectedPerson, selectedClassroom);
    personView.updateView();
  }
} import from './classroom' import from './person' class AppView constructor this new this new this document 'button' this 'Add selected Person to Selected Class' this 'click' this this const this const const const const This class would have it's own variables that would link to both the and views. Since it has access to those two views it also has access to their controllers. ApplicationView classroom person This button above is generated by the view. It grabs the and values from their respective controllers and runs the function in the classroom view upon interaction. Application selectedClassroom selectedPerson addPerson() For a full look at the Classroom App check out the CodeSandBox Here! Some Advantages of Using the MVC Framework Sources: , , , Brainvire c-sharpcorner StackOverflow Wikipedia 1. Separation of Concerns All code related to the is handled by the . All base data variables are contained by the and all model data is changed through the . User Interface view Model Controller 2. Simultaneous Development Since this model clearly separates the project into three (3) layers it becomes a lot easier to separate and assign tasks to multiple developers. MVC 3. Ease of Modification Can easily make changes to each layer without immediately affecting the other layers. 4. Test Driven Development (TDD) With clear separation of concerns it allows the testing of each individual component independently.

How I Adopted the Model, View, Controller (MVC) Architectural Pattern in JavaScript

The Definitive Crash Course on Serverless with AWS: Centralized logging with Kinesis and Lambda

C# is one of the most versatile programming language and brings in ease of programming offered by languages like Java, and has roots in the C family of languages including C and C++. C# is type-safe, object oriented and runs in the .Net Framework run-time, and C# code is compiled into IL (intermediate language) that conforms to CLI specifications. Talking a bit more about C#, it is fast becoming the preferred language for beginners to learn programming in general, as well as to code for many products that come from the house of Microsoft. You can use C# to build database applications, web services, client-server applications, games, mobile apps and much more. One can learn C Sharp basic concepts in an hour by following a good C# tutorial or spend hours struggling with low-quality learning material. To make it easier for everyone to find the best C# tutorial, I have listed down many tutorials and learning resources, each labeled by complexity and delivery media. Complexity of every tutorial and resource is marked as beginner, intermediate or advanced level C# tutorials. Delivery media is marked either as video, interactive online, downloadable pdf or an online guided course. Most of the C sharp resources and tutorials mentioned in this article are free but some of the paid courses are too good to be excluded from this list. One of the courses that you cannot miss (Have a look for sure, 80% discount) is: – This course includes high quality, bit sized videos with real world coding examples and exercises. A perfect choice if you are a beginner programmer. C# Basics for Beginners: Learn C# Fundamentals by Coding Another one to check before you read this article further is: – Great option if you want to learn C# and games development with Unity game engine. You will learn to create 7 2D and 3D games in this course. The course is already taken by over 200K students and is highly rated by students. Learn to Code by Making Games - Complete C# Unity Developer Let us look at the 20 and resources to learn C#, starting with Microsoft Virtual Academy - Best C# Tutorials 1. Microsoft Virtual Academy – Beginners, Video Straight from the house of Microsoft, the creators of C#, Microsoft Virtual Academy is the best place for an absolute beginner to learn C# programming. They have 24+ training episodes, covering depths and breadths of C#. Bob Tabor, the instructor, provides practical guidance around using C# for mobile apps, client apps, video games and other programming endeavors. You get slide presentations, video tutorials, and a free visual studio community development environment to code and organize your C# projects. Bob Tabor provides many samples to make you understand simple and complicated techniques of C# programming. At the minimum, you will get to do the below – Creating your first C# program;Working with projects, code files, and solutionsUnderstanding different data types, variables, if decision statement, operators, expressions, statements, for iteration statement, while loop, date and time and other basic programming fundamentals.Understanding and working with Classes, methods, accessibility modifiers, namespaces, .Net class library, collections, LINQ.Exceptions handling, events and event driven programming. You can check out few other video C sharp Tutorials at VMA, like the one from Jerry Nixon and Daren May - . Programming in C# Jump Start 2. TutorialsPoint.com – Beginners, Online TutorialsPoint is one of the best free online learning resources out there in the wild. It has more than 20 million readers who run through 50 million pages every month to learn programming. Their C# tutorials are divided into three categories: C# Basic Tutorial, advanced C# tutorials and useful resource that include Q&A, quick guides and discussion groups. The basic section covers more about environment setup, data types, variables, constants, operators, loops, methods, arrays, structure, enums, classes, namespaces, file I/O and much more. On the advanced section, it covers reflection, delegates, events, unsafe codes, multithreading, indexers etc. and much more. Tutorialspiont also provides Tutor Connect, it is their free platform where students can connect with tutors and get guidance on any topic. Another great thing from the house of Tutorialspoint is a mobile app for C# tutorials, you can download it free and start learning on the go. 3. Simpliv.com – All Levels Simpliv is one of the biggest player in the online education market and hosts more than 10, 000 courses with over 5 million students from across the globe. Simpliv hosts some of the available online, and each course includes coding sessions, video lectures and exercises to hone your skills on C# programming. The content of every course is very clearly outlined so that you know what you are supposed to learn prior to subscribing for the course. best C# Tutorials Some of the popular and bestselling courses include – C# Basics for Beginners: Learn C# Fundamentals by Coding – This course includes high quality, bit sized videos with real word coding examples and exercise. A perfect choice if you are a beginner programmer. Learn to Code by Making Games - Complete C# Unity Developer – This one for you if you want to learn C# and games development with Unity. The will learn to create 7 2D and 3D games in this course. The course is already taken by over 200K students and is highly rated. Design Patterns in C# and .NET – This course is for the experienced developers who want to hone their programming skills in C# to build enterprise grade applications, mobile games and other software applications. 4. Pluralsight.com – Intermediate, Free, Video - One of the best C# tutorial Pluralsight hosts many courses on different programming topics. When it comes to C#, the course labeled C# fundamentals with C# 5.0 is one of the best available anywhere on the internet. It covers depths of C# and focuses on fundamentals of C# on.Net platform, for beginner programmers. Scott Allen, the author of the tutorial, has 15 years of experience in the field of commercial software development. His step by step course will give you good grasp on the C# syntax, use of classes, writing properties and methods, generating and handling events, object-oriented programming paradigm, and hands on experience with tools like Visual Studio. 5. Learncs.org – Beginners, Interactive, online Console This website is for everyone who wishes to learn C# programming language. You don’t need to download anything, all you need to do is to choose any chapter you want to begin with and follow the instructions given, the online interactive shell is available to write the code and see the output live. The basic tutorial starts with an introduction, “Hello, World!” where you write the simple function in the editor on the left and see the output in the console on the right side of the window. The rest of the chapters discuss essential topics like variables and types, arrays, lists, dictionaries, methods, strings, loops, class properties, and more. 6. Codementor.io – Beginners, Intermediate and Advanced, Online Codementor is a different animal altogether, it hosts tutorials to provide solutions to specific C# programming problems. Whether you’re just a beginner, intermediate level or an expert programmer, you will find ample tutorials on Codementor to sharpen your C# skills. They offer a live one-on-one tutorship with an expert mentor, which essentially means that you do not need to spend hours or days trying to solve a specific problem in C#, rather you can find the solution with help of Codementor’s expert developers. Codementor also offers few beginners tutorials and useful learning guides to help you get started. These resources can expand your knowledge in C#. Some of their tutorials are and jects. C# Tips that Improve Code Efficiency and Productivity Quick Intro to MSBuild Pro 7. Sololearn.com – Beginners, Interactive Everyone can code is the theme of SoloLearn. Though it offers paid courses but C# course is free of cost and offers interactive learning material in text format followed by quizzes. There are total of 69 lessons and 199 quizzes to sharpen your C# skills. Various topics covered include methods, classes, arrays, encapsulation, polymorphism, exceptions, generics, loops, conditional statements, variables and everything else you need to know about C#. What I like about this course is interactive code editor where you can write custom code, and in parallel, check the output on your mobile device. Cool, huh! You can also participate in Forums on Sololearn to share knowledge and ask questions to fellow learners. 8. Csharp-station.com – Beginners, Online C# station is a community site for everyone interested to learn about C# for .Net based applications, it hosts many articles, links to other and learning resources. The articles are meant to cover the specific C# problems and provide guidance around various programming topics like what is new in C#, reading and writing to files, introduction to strongly typed data sets, assertions with .Net etc. and many more. best C# tutorials Tutorials on the other hand cover step by step instructions to start learning C sharp programming, these are meant for beginners and include sample code and line by line explanation of the code snippets used. The third section includes many links to the external websites and useful resources, all in all a good place to visit on regular basis to discover everything about C#, the only thing I don’t like about this website is too many ads that frustrate you at times. 9. C-sharpcorner.com – Beginners, Online C-sharpcorner is one of the most popular communities of C# developers who learn, share, ask questions, provide answers and interact with other C# programmers across the globe. This website contains tutorials and guides that cover every aspect of C# including visual C# programming, Windows Forms Controls using C#, WPF controls using C#, SilverLight programming using C# and everything else you would ever need to know about C#. The prerequisite is to install either Visual C# 2010 Express or MonoDevelop which is required to write your C# code. The popularity of this website can be gauged from the fact that it has 2,468 articles, 1,519 blogs, 80 videos, 68 resources, and many news articles about C# programming language. 10. Tutorials Teacher Very comprehensive and covers depths of programming in C#. This one is the course for you if like to go step by step and in a well-organized manner, without missing out on anything. This free C# tutorial covers anything and everything about C# including basic environment setup, C# and .Net version history, classes, variables, data type, keywords, interfaces, operators, ternary operator, switch, while loop, do-while loop, for loop, struct, enum, string builder, multi-dimensional array, jagged array, collections like hashtable, queue, stack, sorted List and Array List, working with Files, I/O stream, delegates, events, generics, partial classes, anonymous method, nullable type, LINQ, func, action, predicate, dynamic type, object initializer and much more. 11. msdn.microsoft.com – Beginners, Online interactive shell This is the .Net and C# learning in browser from Microsoft and is organized in total of 20 lessons. It is not a very thorough and in-depth tutorial, but a quick guide to run through the basics of C# programming. The instructor explains the sample code used for and provides additional background information of the language. Some of the topics covered by the instructor includes command line parameters, arrays, properties, libraries, other C# basics and some of the advanced topics as mentioned below - Defining and calling methods, objects, classes, scope and accessibility modifiersNamespaces, LINQ and encapsulationHow and when about exceptions handlingPatterns and antipatternsTesting and troubleshooting the code You also have option to run the code samples live in the browser, edit the code and see the output right there. This tutorial is not meant for creating and learning GUI based applications like web Forms or windows forms etc. 12. Lynda.com Inc. – Intermediate, Advanced, Online, Video Like Udemy, Linda also hosts tutorials and courses for many programming language. Talking specifically about C# tutorials, the quality and variety of C# tutorials on this website is exceptional. The link above takes you to the C# beginners video course from Gerry O’ Brien, this video course is around 3hrs and 16m in length and is viewed around 1 million times, fantastic, isn’t it? This is not the only course on Lynda, there are other courses that cover intermediate and advanced level concepts around C# as well, some of the popular courses include C# design patterns, C# algorithms and there are many more. You need to register for trial version of to go through their tutorials and courses. Lynda.com 13. C# Crash Course by RB Whitaker This is another website I recommend for learning c#, in here RB Whitaker lists over 25 C# tutorials but states that you do not need to take them all. So, if you are a fast mover and need to understand the basics, then tutorials 1-17 are for you. After 17, there are tutorials around more specific topics like tutorials #23, which is on generics and tutorial no #2 which is on error handling. Some of the key aspects covered in basic tutorials include installation, writing the first C# program, working with math, loops and decision making, polymorphism, inheritance and much more 14. Brackeys - How to program in C# - BASICS - Beginner Tutorial (YouTube) A complete playlist here on the YouTube from , and a fantastic one indeed, to learn the depths of C# programming. The link above refers you to the Youtube video tutorial that covers the basics of C sharp, but there are many other related C# learning video tutorials from . This YouTube tutorial is liked by more than 7K students and is viewed around 1 million times. Brackeys.com Brackeys.com The tutor talks about why C#, what are the uses of C#, what is console application, the IDE to develop C# programs, installation and setup on Mac and PC and then creation of your first project, so pretty much basic. But if you are already familiar with al this, you can skip past to the other videos on the playlist that cover further topics to learn C# programming. 15. Completecsharptutorial.com – Beginners, Online This is a free tutorial website which teaches you everything about C# programming. contains 17 sessions that guide you from learning the most basic concepts to polymorphism, File I/O, Delegates and Events and much more. Complete C# Tutorial They also have step-by-step pictorial guide and programming exercises at the end of each chapter which helps in practice. Apart from the C# basics, the website lists tutorials on related technologies to help you build complete application, these tutorials are on topics ranging from Entity Framework6, ADO.Net, Razor, SQL query, CSS and more. 16. Alison.com: Diploma in C# Programming – Beginners, Online is a free online course published by Channel9 to learn C# and covers the basics of C# programming using the Visual Studio Express IDE from Microsoft. Diploma in C# Programming This tutorial focuses on using C# programming to create .Net applications. The end to end course spans for around 10-15 hours, including final assessment, followed by certification. 17. Coursera - Beginning Game Programming with C# Now we are getting into Games programming, this tutorial on Coursera is highly rated by students with overall rating of 4.7 out of 5 and covers games development for iOS, Mac, OS X, Android, Windows and other platforms. Author starts off with topics like why C# is a great option for developing games, how to develop games using C#, use of open source MonoGame framework, visual studio, XNA and much more. 18. Home & Learn – Beginners, Online This computer course is an introduction to Visual C# .NET programming and can be taken even if you have no clue about programming. You don’t have to buy any software for this course as you can use the free version of Visual Studio from Microsoft. There’s no need to sign up or register either. You simply have to click the given tutorial links on this website to begin your C# learning journey. The tutorials come mainly in text but are supported with visuals. 19. Developer University – Beginners, Intermediate, Advanced, Online, Video If you are looking forward to creating ASP>Net applications using C#, this is a great place to start. They offer 30+ hours of video instruction, dozens of assessment questions, coding challenges and solutions, cheat sheets, and enabling closed captioning. 20. Csharp.net-tutorials.com – Beginners, Online, PDF This is another thorough tutorial on C# and covers all aspects. The website offers to download the whole tutorial in PDF format for around $10. The online reading is free of cost though. The tutorials in PDF format allow you to learn wherever you are, online or offline, with the use of your computer, tablet, or mobile phone. The document is nicely formatted, and the chapters are in order. Unlike the PDF format, the online-based tutorial isl free. Conclusion There are many C# learning resources online in the form of interactive tutorials, eBooks, PDFs, Videos and text format. The best way to begin your journey of C# training is to figure out the great tutorial or course and then follow it with full focus.

Learn C#: A Huge List of C# Tutorials

Top Rated E-Commerce Companies & Platforms Around the World As per the data shared by emarketer company, with the rise of m-commerce, the eCommerce industry has seen . High growth rate has seen not only in the USA or Europe but also in the Asia Pacific region. Read this post to know, how the eCommerce industry is growing all over the world and which are top commerce companies in the UK, USA, India, Australia, & Middle East. Additionally, you can read, which are the best e-commerce platforms to start an online business. unprecedented growth in the last 3–4 years 1. Which are the top 10 E-Commerce companies in the USA? USA e-retail market has grown by 24.8% in the previous years. Here is a graph by Statista, that shows the steady growth rate of ecommerce in the USA: Here are the names of USA top ecommerce companies · Walmart — Established in 1962 · Amazon — Established in 1994 · Overstock — Established in 1995 · Ebay — Established in 1995 · Best Buy — Established in 1966 · Wayfair — Established in 2002 · Macy’s — Established in 1858 · Costco — Established in 1983 · Apple — Established in 1976 · The Home Depot — Established in 1986 Data Source: https://www.emarketer.com/Chart/Top-10-US-Companies-Ranked-by-Retail-Ecommerce-Sales-Share-2018-of-US-retail-ecommerce-sales/220521 2. Which are the top 10 E-Commerce companies in India? Ecommerce sector is growing equally well in India. Here is a graph by statista, that shows the high growth rate of eCommerce industry in India: Here is a list of India’s top 10 ecommerce companies: Amazon India — Established in India in 2013 FlipKart — Established in 2007 Snapdeal — Established in 2007 Indiamart — Established in 1996 MakeMytrip — Established in 2000 Paytm — Established in 2010 Myntra — Established in 2007 BookMySHow — Established in 1999 Yatra — Established in 2006 Ebay India — Established in India in 1995 Data Source: https://www.fundoodata.com/learning-center/top-10-e-commerce-companies-india-2/ 3. Which are the top 10 E-Commerce companies in UAE? Have a look on the growth rate of eCommerce in the middle east countries: source: thenational.ae Here are the names of UAE’s top eCommerce companies: Souq — Established in 2005 Mumzworld — Established in 2011 Aido — Established in 2015 Jadopado Established in 2010 — Dubizzle — Established in 2005 Alshop- Established in 2008 Awok — Established in 2013 MarkaVip — Established in 2013 Axiomtelecom — Established in 1997 Data Source: https://www.go-gulf.ae/blog/ecommerce-sites-middle-east/ Must Read: Live the startup dream — Start your online business with these ready to launch ecommerce systems 4. Which are the top 10 E-Commerce companies in the UK? Ecommerce industry is booming in the UK and 87% of retail purchases have made online. Here is a graph by statista on UK’s eCommerce industry growth: UK’s top ecommerce companies Names: Amazon UK Boux Avenue — Founded in 2011 Play.com — Founded in 1997 Apple Tesco — Founded in 1919 Marks & Spencer- Founded in 1884 John Lewis — Founded in 1929 Superdry — Founded in 1929 Easy Jet — Founded in 1929 Farfetch UK — Founded in 2007 Data Source: https://blue-shark.co.uk/blog/top-10-uk-e-commerce-websites/ 15 of the UK's fastest-growing retailers - Insider Trends 5. Which are the top Ecommerce Companies in Australia? There is an exploding growth of eCommerce in Australia in the last 2 years. Fashion industry reported a 27% growth in 2017. Here is a graph that shows, the rise of users in the eCommerce industry year by year: Australia's top eCommerce companies names JB Hi-Fi — Founded in 1974 Ebay Australia — Founded in 1999 Amazon Australia — Launched in Australia in 2017 Office Works — Founded in 1994 Kogan — Founded in 2006 Woolworths — Founded in 1924 The Iconic — Founded in 2011 Red Balloon- Founded in 2001 Appliances Online Founded in 2005 — Dick Smith — Founded in 1968 Data Source: https://www.slideshare.net/cloudwayshosting/top-20-ecommerce-sites-in-australia 6. Which are the top Ecommerce Companies in Spain? As per the stats on eshopworld website, in 2022, there will be 30.50 million online shopper in Spain. Fashion industry is booming in Spain and has turnover of 5.5 billion euros. Here is a list of top ecommerce companies in Spain: Amazon Alibaba El Corte Inglés Ebay Mil Anunacios Pc Componentes Zalando Lets Bonus Zara Apple Data Source: https://www.export.gov/article?id=Spain-ecommerce 7. Which are the top Ecommerce Companies in Italy? Italy has over 19million online shoppers & most popular online industries in Italy are travel, information technology, & computer electronics. Here is a list of top 10 ecommerce companies in the Italy: Amazon Italy Ebay Italy Trovaprezzi Yoox Apple Kelkoo IBS Zalendo Euronics BonPrix Data Source: https://ecommercenews.eu/ecommerce-in-europe/ecommerce-italy/ How to Start an Online E-commerce Business? Considering the growth rate of eCommerce all over the world, it won’t wrong to say that starting an online eCommerce business is a win-win idea. First and foremost step while starting an online store is the selection of an eCommerce platform. This is where you can might be go wrong because you need to to start your online store. consider various factors while selecting an eCommerce platform Top Platforms to Start an Online Ecommerce Business: Here, I am sharing the list of best ecommerce platforms, by which you can start your online store quickly. Please note, all the below platforms are built to purpose different business requirements, so choose a platform that serves your needs best. — One of the best platforms to start an online retail store. Shopify — Best platform to start a similar to Amazon, eBay, Flipkart, at a minimal investment. A user-friendly platform for people who have little to no technical knowledge. YoKart multi-vendor ecommerce store - Highly recommended platform to start a large enterprise. Magento — Woocommerce could be your choice if you are looking to start a small scale online store on the WordPress. Woocommerce — A ready to launch platform to start an online grocery store swiftly at a small investment. Growcer — A tough competitor to shopify platform and often considered the best option for those who have little to no technical knowledge. Bigcommerce — With the slogan ‘We believe in the artist’, Big Cartel targets artists & other small-scale home-based businesses run by individuals. BigCartel — A cloud based ecommerce platform with a password free checkout Vtex — Start a food marketplace like Zomato, GrubHub, Just Eat with YoYumm multi-restaurant platform at a price of $499. YoYumm : Volusion platform caters to stores of a broad range of industries, and given its comprehensive list of in-built features and functionalities. Volusion Hope it helps you. If you believe, I have missed the name of any major eCommerce company or platform, please share in the comments. I would love to add to the post.

Top 10 E-Commerce Companies & Platforms Around the World

Optimizing the way open-source SDK Flutter deals with external texture for Android and iOS apps This article is part of Alibaba’s Utilizing Flutter series. In computing, as in much of life, any given method can see a lot of use before its latent flaws reach a decisive impasse. For Alibaba, discovering one such flaw in software development kit Flutter meant the difference between success and failure in the group’s recent work on a mobile app for its Xianyu(闲鱼) second-hand trading platform. Now the Alibaba team has successfully optimized Flutter for a new range of uses unique to Xianyu’s marketplace, implementing an OpenGL process for the entire UI rendering process to reduce CPU and GPU resource overhead. In today’s article, we look at the group’s optimization efforts alongside a detailed view of the inner workings and “external texture” of Flutter that technical audiences can explore in their own work. Flutter Rendering Framework The Flutter rendering framework is organized into a series of layers, with each layer building upon the previous layer. The architecture design of the Flutter Rendering Framework is shown below: The Flutter rendering framework, by layer 1. : The rendering pipeline is a tree-like structure output by the Dart API at runtime. Each leaf node on the tree represents an interface element, such as buttons, images, and so on. Layer Tree 2. : A cross-platform rendering framework sponsored and managed by Google. It serves as graphics engine for iOS/Android applications. The bottom layer of Skia is known as OpenGL drawing. Vulkan support is very limited and Metal does not provide the support. Skia 3. : A platform feature that includes iOS/Android platform implementations, EAGLContext management, returning data on a screen, and the external texture implementations. Shell The Layout process is executed at the Dart runtime and outputs a Layer tree. Each leaf node of the Layer tree is traversed in the pipeline to call the Skia engine for completing the drawing of the interface elements. After completing the above-mentioned process, do the following: 1. iOS: Run the command to display the render buffers contents on the screen. Android: Run the command to perform a buffer swap on the layer in use for the current window. glPresentRenderBuffer glSwapBuffer 2. Click the Complete display-on-screen link. Based on this principle, Flutter can implement UI isolation on Native and Flutter Engine. It also captures the UI code without analyzing the platform implementation on the cross-platform solutions. Implementation Problems There are pros and cons to this implementation. Flutter is isolated from Native, which can sometimes make it feel like there is a mountain separating Flutter Engine and Native. This poses issues when Flutter wants to capture high-memory images of the Native side, such as camera frames, video frames, album images, and so on. Traditional applications (RN, Weex, and so on) can directly obtain this data by bridging the NativeAPI. Flutter, meanwhile, determines whether the data can be directly captured and sends a notification message based on the defined channel mechanism, inevitably leading to huge memory usage and CPU utilization while transmitting the data. Bridging the Gap with External Texture Flutter provides a special mechanism known as an external texture. Note that textures are images that can be applied to an area of the Flutter view. They are created, managed, and updated using a platform-specific texture registry. This is typically done by a plugin that integrates with host platform video player, camera, or OpenGL APIs, or similar image sources. The architecture diagram of LayerTree is shown below: LayerTree architecture Each leaf node represents a control of dart code layout. TextureLayer node at the end corresponds to the texture control in Flutter. When a texture control is created in Flutter, it represents the data displayed on this control that needs to be provided by Native. Note that this texture is different from GPU’s texture. It is for Flutter’s control. The following is the final drawing code of the TextureLayer node on the iOS platform. The code for the Android platform is similar, but its method of obtaining texture is slightly different. It is recommended to run the code following these three steps: 1. Make the call of external texture’s copyPixelBuffer function to get CVPixelBuffer 2. Create the OpenGL ES Texture — CVOpenGLESTextureCacheCreateTextureFromImage 3. Capture the OpenGL ES texture into a SKImage and make the call of Skia’s DrawImage function to complete drawing. void IOSExternalTextureGL::Paint(SkCanvas& canvas, const SkRect& bounds) {  if (!cache_ref_) {    CVOpenGLESTextureCacheRef cache;    CVReturn err = CVOpenGLESTextureCacheCreate(kCFAllocatorDefault, NULL,                                                [EAGLContext currentContext], NULL, &cache);    if (err == noErr) {      cache_ref_.Reset(cache);    } else {      FXL_LOG(WARNING) << "Failed to create GLES texture cache: " << err;      return;    }  }  fml::CFRef<CVPixelBufferRef> bufferRef;  bufferRef.Reset([external_texture_ copyPixelBuffer]);  if (bufferRef != nullptr) {    CVOpenGLESTextureRef texture;    CVReturn err = CVOpenGLESTextureCacheCreateTextureFromImage(        kCFAllocatorDefault, cache_ref_, bufferRef, nullptr, GL_TEXTURE_2D, GL_RGBA,        static_cast<int>(CVPixelBufferGetWidth(bufferRef)),        static_cast<int>(CVPixelBufferGetHeight(bufferRef)), GL_BGRA, GL_UNSIGNED_BYTE, 0,        &texture);    texture_ref_.Reset(texture);    if (err != noErr) {      FXL_LOG(WARNING) << "Could not create texture from pixel buffer: " << err;      return;    }  }  if (!texture_ref_) {    return;  }  GrGLTextureInfo textureInfo = {CVOpenGLESTextureGetTarget(texture_ref_),                                 CVOpenGLESTextureGetName(texture_ref_), GL_RGBA8_OES};  GrBackendTexture backendTexture(bounds.width(), bounds.height(), GrMipMapped::kNo, textureInfo);  sk_sp<SkImage> image =      SkImage::MakeFromTexture(canvas.getGrContext(), backendTexture, kTopLeft_GrSurfaceOrigin,                               kRGBA_8888_SkColorType, kPremul_SkAlphaType, nullptr);  if (image) {    canvas.drawImage(image, bounds.x(), bounds.y());  }} Where does the external_texture_object come from? Before making the call of RegisterExternalTexture on the Native side, create an object for implementing the FlutterTexture protocol, which is assigned to the external_texture object. The external texture is a bridge between Flutter and Native, used to continuously obtain the image data to be displayed. As shown in the figure, the PixelBuffer is the carrier of data transmitted by Flutter and Native while using the external texture. The data source (camera, player, and so on) of the Native side transmits the data into PixelBuffer. Flutter takes PixelBuffer and converts it into OpenGL ES texture for Skia to complete the drawing. At this point, Flutter can easily draw all the data that the Native side wants to draw. In addition to the dynamic image data (the camera player), the display of the image provides another possibility beyond the Image control, especially for the Native side when there are large-scale image loading libraries like SDWebImage. This process is very time consuming and laborious when there is a need to write a copy with dart on the Flutter side. Optimizing Processing Speed The entire process described above seems to solve Flutter’s problem of displaying native-side big data, but it has the following limitations: As shown in the above diagram, the video image data processing generally uses GPU processing on the Native side to improve the performance. The copyPixelBuffer interface is defined by the Flutter side. The entire data flow goes through GPU > CPU > GPU process. Note that the memory swapping between CPU and GPU is the most time-consuming in all operations. One go-and-back usually takes longer to complete than the process time of the entire pipeline. The Skia rendering engine requires GPU Texture and the Native data processing output is GPU Texture. This GPU Texture can be used directly using a shared resource of EAGLContext. An EAGLContext object manages an OpenGL ES rendering context — the state information, commands, and resources needed to draw using OpenGL ES. The thread structure of Flutter is introduced as below: Flutter usually creates 4 Runners. The TaskRunner is like the iOS Grand Central Dispatch (GCD). It is a mechanism for executing tasks in a queue. Generally, the TaskRunner communicates to a thread and Platform Runner is running on the major thread. The following 3 TaskRunners are relevant to this article: 1. : Responsible for GPU rendering related operations. GPU TaskRunner 2. : Responsible for the loading of resources. IO TaskRunner 3. : Responsible for all swapping between Native and Flutter Engine and running on the major thread. Platform TaskRunner Usually, an app thread design that uses OpenGL will have two threads — one thread for loading resources (from image to texture) and another thread for rendering. However, it is often the case that in order to enable the texture created by the load thread to be used in the render thread, the two threads share one EAGLContext. This is not standard practice, as it is unsafe. Multi-threaded access to the same object with lock will inevitably affect performance. It will even cause deadlock when the code is not well processed. To avoid this problem, Flutter provides a new mechanism for the use of EAGLContext — each thread uses its own EAGLContext and shares texture data via ShareGroup for iOS apps and shareContext for Android apps. (Although the users of the two Contexts are the GPU and the IO Runner respectively, the two Contexts of the existing Flutter logic are created under the Platform Runner. This aspect of Flutter’s design is rather puzzling and creates all sorts of issues, but these fall outside the scope of this article.) For the module that uses OpenGL on the Native side, that also creates a Context corresponding to and under its own thread. To deliver the Texture created under this Context to the Flutter and send this data to Skia for complete drawing, disclose the ShareGroup for iOS apps while creating two internal Contexts in Flutter and then save the ShareGroup on the Native side. When Native creates Context, it will also use this ShareGroup to create it. In this way, Native and Flutter can share texture. The following are two benefits that come from using external_texture: 1. Alibaba tests concluded that a frame of 720P RGBA format video on an Android model takes about 5ms from reading GPU to CPU, then takes another 5ms from CPU to GPU. Even when PBO is introduced, there is also about 5ms time consumption, which is obviously unacceptable for high frame rate scenarios. Reduced compute time 2. As one might intuit, data is passed on the GPU, especially in picture scenes (because there are many pictures to be displayed at the same time). Reduced CPU memory consumption Some Side Notes Now that the basic principles of Flutter external textures and optimization strategies have been introduced, this section deals with some drawbacks and exceptions to these principles. Integrity of Flutter’s Texture vs. Pixelbuffer A question many people ask at this point is: If using Texture directly as an external texture is as good as claimed, then why is Google using Pixelbuffer? If you use Texture, you will have to disclose the ShareGroup, which means the GL environment of Flutter is open. If the external OpenGL is not working properly, the OpenGL object is just a number, a Texture or a FrameBuffer to the CPU and to the user is a GLuint (Unsigned binary integer) when breaking points. If the environment is isolated, the user can operate deleteTexture and deleteFrameBuffer as they wish without affecting the objects in other environments. Otherwise, these operations would probably affect the objects under the Context of Flutter. As a framework designer, the biggest priority is making sure the framework is a closed environment so as to maintain its integrity. Troubleshooting: Crashes During the development process, the team encountered a strange problem: Flutter would routinely crash during rendering, but nobody could figure out why. After much searching, the cause was finally identified as being making the call of glDeleteFrameBuffer when the main thread did not have setCurrentContext, which meant Flutter’s FrameBuffer was accidentally deleted. If you do choose to use this program, the relevant GL operations on the Native side should follow at least one of the points below: 1. Try not to perform GL operations on the main thread; 2. Always add setCurrentContext before the call of function with GL operation. iOS vs. Android Most of the logic in this article is based on iOS examples. The overall principles are the same for Android, but the implementation is slightly different. The external texture of Flutter on the Android side is implemented by SurfaceTexture. The mechanism is actually the copy from CPU to GPU memory. There is no concept of ShareGroup in Android OpenGL. Instead, it uses shareContext, which means Context is transmitted out directly. Additionally, the GL implementation of Android in the Shell layer is based on C++, so Context is a C++ object. To share this C++ object with the Java Context object of the Android Native side, you need to make the call in the jni layer as follows: static jobject GetContext(JNIEnv* env,                          jobject jcaller,                          jlong shell_holder) {    jclass eglcontextClassLocal = env->FindClass("android/opengl/EGLContext");    jmethodID eglcontextConstructor = env->GetMethodID(eglcontextClassLocal, "<init>", "(J)V");        void * cxt = ANDROID_SHELL_HOLDER->GetPlatformView()->GetContext();        if((EGLContext)cxt == EGL_NO_CONTEXT)    {        return env->NewObject(eglcontextClassLocal, eglcontextConstructor, reinterpret_cast<jlong>(EGL_NO_CONTEXT));    }        return env->NewObject(eglcontextClassLocal, eglcontextConstructor, reinterpret_cast<jlong>(cxt));} (Original article by Chen Lujun陈炉军) Alibaba Tech First hand and in-depth information about Alibaba’s latest technology → Facebook: . Twitter: . “Alibaba Tech” “AlibabaTech”

Stories, News & Mentions about SHARYCO

Sharyco’s Stories on HackerNoon

Sharyco's News & Mentions