Apache ActiveMQ expertise

ActiveMQ is a message-oriented middleware (“MOM”), allowing to implement messages exchanges between applications. Developed in Java, leader in the Open Source market, it is distributed by the Apache Foundation.

In an information system, many heterogeneous systems that do not “understand” each other may need to communicate, and it may be necessary to link these applications together.

Companies, institutions, change continuously, like the technologies they use. As a result, their software systems must be able to adapt to these changes. Indeed, it is difficult for a company to recreate its information systems with each evolution of one of its services, or internal organization change … .

At this crucial time, you need to integrate new components, or adapt the existing components, as efficiently as possible. The simplest way to integrate heterogeneous components is not to recreate them as homogeneous elements but to provide them with a layer that allows them to communicate, despite their differences. This layer, called “middleware“, allows software components, which have been developed independently, and run on different networked platforms, to interact with each other.

Terminology

  • What is a middleware ?

Middleware is a third-party software that creates a network of information exchange between different computer applications. The same information exchange technique in all the applications involved enables their communication, using software bricks, whatever the computers, hardware or software characteristics, operating systems or network protocols involved.

  • What are “messages” ?

Messages are the entities used by systems to communicate with each other. The messages flow in a direction from a sender to a receiver. Uniquely ID-identified, they have a body, and headers/attachments are optional. The messages have different properties, such as JMSTimestamp, JMSExpiration, JMSXDeliveryCount … .

  • What is a message broker ?

A message broker is a logical hub that copies and sends messages to one or more destinations. It is a great value-added between information sources and information consumers, and is complementary to a service-oriented architecture (SOA). As in SOA, a broker is an abstraction at the design level that can be implemented using software components. The messaging broker can operate in Object Request Broker (ORB) or Object Transaction Monitor (OTM).

Examples of use :

– Routing messages to one or more destinations ;

– Message transformation ;

– Asynchronous communication between different processes, objects, or other agents ;

– Aggregation of messages by pre-decomposition into several messages, sending and recomposing responses in a single message ;

– Data recovery on webservices … .

active-mq-message-broker

Using a central message broker that can: receive messages from multiple destinations, determine the correct destination, and route messages to the correct channel, while implementing EIPs, is one way to maintain central control over the flow of messages.

  • What is a message oriented middleware ?

MOMs are a family of software that allows the exchange of such messages between applications on a computer network. They are part of the basic technical elements of computer architectures, and allow to couple the applications. Two major types of operation are distinguished:

Point-to-point: an application produces messages and an application reads them. Messages are only read by one consumer application. Once a message is read, it is removed from the queue.

Publish-subscribe : message-consuming applications subscribe to a “topic” or a category of messages. Messages sent to this topic remain in the queue until all subscribed applications have read the message.

Other open source Message-Oriented-Middleware exist, such as Kafka, JBoss Messaging, RabbitMQ … .

More about ActiveMQ

Apache ActiveMQ is the most popular and powerful Message Broker of the open source market. It is known for its message handling, which is its most famous asset, after its speed, scalability, reliability, security and compatibility with many clients and protocols. Using the integrated Camel project, it has the ability to process enterprise messaging based on Integration Models (EIP). Indeed, ActiveMQ comes with a set of easy-to-use Enterprise Integration Patterns.

Also available for Linux, ActiveMQ follows the tradition of the community and relies on other projects from the Apache Foundation, such as Camel, or Jetty (Integrated Application Server). ActiveMQ is also used by other major Apache projects, such as ServiceMix or Geronimo … .

ActiveMQ comes under another project, called “ActiveMQ Apollo”, which wants to be an even faster broker, more reliable and easier to manage, using a radically different architecture of threading and sending message. Multiprotocol, it supports STOMP, AMQP, MQTT, Openwire, SSL and WebSockets, like ActiveMQ.

Once installed, ActiveMQ can be used in Talend mediation routes, for example, or in the services offered in RedHat’s JBoss.

Key elements

Crosslanguage compatibility : This feature is important because applications can be written in different languages ​​like C / C ++, Python, Ruby, Java, etc. Multilanguage compatibility allows communication between a wide variety of applications, and allows seamless integration. This is probably the most important feature for message-oriented middleware ;

AJAX and REST support : Webservices and applications can communicate easily, thanks to AJAX and REST standards (browser<-> server) ;

Compatibility with Various Transport Protocols : Messages can be efficiently transferred through a variety of protocols, such as Transmission Control Protocol (TCP), User Datagram Protocol (UDP), and Secure Socket Layer (SSL), for example ;

Persistence support : Persistence is the ability of an application to preserve its state. In other words, it is the ability of a program to end without its data and execution state being lost. In the context of ActiveMQ, persistence is mainly used for database-related applications ;

High performance computing and high availability : Three levels of availability are possible (Very High Availability / High Availability / Full Disaster Recovery). ActiveMQ ensures that no form of failure affects the end user. For an application, if one instance fails, another takes over, for example ;

Exchange security : ActiveMQ provides two layers of security. an SSL / TLS layer to authenticate the broker with clients, encrypt messages and guarantee their integrity, and a JAAS layer that can authenticate clients with the broker.

What we’ll do for you

We can assist you in the process of setting up communications between your different applications, the routing of your messages or in setting up patterns that can standardize the exchange of messages in an asynchronous system.

We are able :

  • To expertise the quality and performance of your projects ;
  • To create your Camel routes and set up ActiveMQ in your environments ;
  • To propose to you the best possibilities in terms of architecture … .

Apache, Apache Karaf™, Apache Camel™, Apache ActiveMQ™, Apache Service Mix™, Apache CXF™ the Apache™ feather logo, and the Apache Karaf™ project logo are trademarks of The Apache Software Foundation™.

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