Introduction to Message Brokers: Part 2: ActiveMQ vs Redis Pub/Sub In the previous overview of the most popular messaging systems, we were talking about Apache Kafka vs RabbitMQ. Now, let’s take a look at the less powerful, but still very helpful message brokers. We will consider the pros and cons of and . Although these solutions aren’t very suitable for processing big data, they provide a strong basis for creating small business analytics tools. ActiveMQ Redis Pub/Sub Apache ActiveMQ free Pricing: http://activemq.apache.org Official website: Useful resources: AmazonMQ Pros: The opportunity of dynamic queue creation Web UI for queue management The broker is configurable through XML The product is actively maintained Cons: Messages must be sent to either queues or topics ActiveMQ is an Apache product written in Java. Developers, who don’t need to deal with huge amounts of data, usually prefer this simple and reliable open source solution. The message broker has become popular due to its fast work and compatibility with many protocols and advanced technologies. The Story of ActiveMQ Development At the beginning of ActiveMQ development, there were 2 reasons to start out the project: The high price of the most popular messaging tools of those times. The necessity of working on a totally compliant system (compatibility with Apache’s licensing). J2EE Unlike its competitors (EMS/TIBCO, SonicMQ, WebSphereMQ), the messaging system combined accessibility with useful and effective features. So, it became popular among great companies form the main industries. LogicBlaze developed the free message broker in 2004. It was hosted by the CodeHaus. In 2007 the system was donated to the ASF. Its founders continued developing the product. ActiveMQ is actively maintained today. ActiveMQ Capabilities The message-oriented middleware provides excellent opportunities for Java developers. The system is based on JMS standards specification and supports async communication. So, it allows the programmer to organize fast and stable messaging process within enterprise projects. I can define 3 key advantages of the messaging system. You can combine ActiveMQ with other mainstream messaging tools. I mean , , . In addition, there is an opportunity to use . It’s an implementation of ActiveMQ, integrated with AWS cloud solutions. Compatibility: Amazon Simple Queue Service Apache Kafka RabbitMQ Amazon MQ The message broker is based on the JMS API. As a result, the processes of creating, transmitting, and receiving messages are determined by the unified standard. Except for Java, ActiveMQ clients can be written in other programming languages. They are Python, Node.js, and Ruby. 2. Convenience: The messaging system works fast enough and helps to use Enterprise Integration Patterns and other modern solutions. At the same time, it’s quite easy to access and get used to. Simple configuration of the message broker is an important advantage for the implementation of enterprise projects. Moreover, ActiveMQ supports many protocols (WebSockets, , REST, , , MQTT, etc). 3. Flexibility: AMQP OpenWire STOMP ActiveMQ Working Principle Just like other messaging systems, the program transmits data from one application (producer) to another (consumer). So, its architecture includes: the broker the destination app the client app The message broker routes each message through one of 2 types of destinations: The first is a . It’s a part of the point-to-point messaging, where there is only one consumer. queue The second is a , which is included in “pub/sub” messaging and means the involvement of several consumers. topic ActiveMQ Peculiarities Thanks to the asynchronous process of message delivering, the consumer app doesn’t need to receive it immediately. ActiveMQ separates the 2 tasks: task of creating and sending a message producer’s task of fetching it consumer’s So, the applications are independent of each other. The producer’s task is completed as soon as it sends a message to a broker. It’s no matter whether or when a consumer app fetches the message. This type of messaging is called and provides some benefits for the developer. loose coupling The producers don’t need to wait for a signal from the consumer or broker. So, the process of sending messages is very fast. The system is capable of achieving a huge throughput. Productivity: Even if the client app is temporarily unavailable (suddenly added to the system, or changed), the messaging process isn’t interrupted or stopped. Adaptability: Independent clients can be written in any appropriate language because they don’t interact with each other. Heterogeneity: All in all, I recommend Apache ActiveMQ as a and message broker. It’s especially suitable for enterprise projects. ActiveMQ is relatively easy to set up in complex structures, shows good reliability and high throughput. hybrid flexible Redis Pub/Sub free Pricing: Official website: https://redis.io Useful resources: tutorial Pros: Flexibility (re-routing messages, tracking of detailed in-server metrics, etc) Simple installation, configuration, maintenance High-speed access for a database A great choice for fast, set-based operations Cons: Challenging configuration of clustering, especially with multiple write nodes Persistence can impact performance Lack of advanced security options and access control The advanced database is written in C. First of all, Redis performs functions of storing data, but it also provides an opportunity of messaging. It helps to create fast, scalable applications. Released under a 3-clause license, Redis is quite popular for the development of tech solutions for small and medium business. BSD Redis Pub/Sub The Story of Development Created in 2009, the mote Ictionary erver still remains an open source project. Its founder worked on his own European startup. It was a real-time web log analyzer, which required increasing of scalability. Facing some challenges with workloads while using traditional databases, the programmer started development of the first version of Redis. He made the project open source and received support from the Ruby community. Instagram and GitHub were among the first great projects adopting the new database. The last program’s release included a new data structure for storing multiple fields and string values with an automatic, time-based sequence. RE D S Redis Pub/Sub Working Principle Implementing the messaging system for queue applications, Redis Pub/Sub works with 3 main terms: (sends messages) publisher (receives messages) subscriber (links the publisher and subscriber) channel Original published at freshcodeit.com It’s also important that the number of channels isn’t limited for a single subscriber. At the same time, publishers are able to send messages to any number of subscribers on a channel. Since all messages in the Publisher/Subscriber platform are fire-and-forget, they are deleted in case of no subscriber determined. Note: You should know that “redis-cli” won’t accept any commands once in subscribed mode. It can only quit the mode with Ctrl-C. Redis Pub/Sub Peculiarities Just like ActiveMQ, Redis Pub/Sub publishers and subscribers are independent of each other. So, when the first of them sends a message, it doesn’t know what receivers are connected to that channel. This is also true for the receivers that subscribe to channels, without knowledge of other publishers. One of the main advantages of this technology is the opportunity to use clients written in different languages. You can read the full . It includes such popular solutions, as Ruby, Python, PHP, Objective-C, Node.js, Java, Clojure, C++, C#, etc. list Using Redis’ Pub/Sub within your infrastructure, you will enjoy quick messaging and communication between processes. The broker’s and make it popular for a wide range of use cases. Taking into account the famous database and the cache feature, Redis can become a handy technology for your future project. simplicity performance Here we end our journey through the messaging systems. Let me know if you like such reviews and your opinions about all of these technologies. self deploy The original article Introduction to message brokers. Part 2: ActiveMQ vs Redis Pub/Sub was published at freshcodeit.com .

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