Message broker

Message broker is an intermediary program which translates the language of a system from one internationally recognized language to another by way of a telecommunications medium.

Pattern

A message broker is an architectural pattern for message validation, message transformation and message routing.^[1] It mediates communication amongst applications, minimizing the mutual awareness that applications should have of each other in order to be able to exchange messages, effectively implementing decoupling.

The purpose of a broker is to take incoming messages from applications and perform some action on them. The following are examples of actions that might be taken in the broker:

• Route messages to one or more of many destinations
• Transform messages to an alternative representation
• Perform message aggregation, decomposing messages into multiple messages and sending them to their destination, then recomposing the responses into one message to return to the user
• Interact with an external repository to augment a message or store it
• Invoke Web services to retrieve data
• Respond to events or errors
• Provide content and topic-based message routing using the publish/subscribe model

Broker Functionality

Many messaging patterns (like publish/subscribe) can work without a message broker. One pattern that requires a message broker is workload queues, that is message queues that are handled by multiple receivers. Such queues must be managed, transacted, and usually stored reliably, at a single point.

List of Message broker software

• DIPS Message Broker^[2]
• Apache ActiveMQ
• OpenAMQ
• Comverse Message Broker (Comverse Technology)
• Antares Enovacom
• eSCL Message Broker^[3] (Interface & Control Systems)
• FUSE Message Broker (enterprise ActiveMQ)
• Financial Fusion Message Broker (Sybase)
• JBoss Messaging (JBoss)
• Microsoft BizTalk Server^[4] (Microsoft)
• Oracle Message Broker (Oracle Corporation)
• Proteus an open source^[5] implementation by Info-Scape
• WebSphere Message Broker (IBM)
• webMethods Message Broker^[6] (webMethods Message Broker)
• Cloverleaf (E-Novation Lifeline)
• SAP PI^[7] (SAP AG)
• Sapo Broker^[8] (Portugal Telecom)
• Python Message Service^[9]
• e-Biz Impact (Sybase, Inc)^[10]
• Spread Toolkit
• RabbitMQ (Mozilla Public License, written in Erlang)
• Axway Integration Broker^[11]

See also

• Publish/subscribe
• Comparison of business integration software
• Message-oriented middleware

Footnotes

1. ^ "Hub and Spoke [or] Zen and the Art of Message Broker Maintenance". Enterprise Integration Patterns. 2003-11-12. http://www.enterpriseintegrationpatterns.com/ramblings/03_hubandspoke.html. Retrieved 2010-10-14. 
2. ^ "DIPS". http://www.dips.no. 
3. ^ "the eSCL Message Broker". Interfacecontrol.com. http://www.interfacecontrol.com/escl/messageBroker.htm. Retrieved 2010-10-14. 
4. ^ "The Official Microsoft WPF and Windows Forms Site". Patternshare.org. http://patternshare.org/default.aspx/Home.PP.ImplementingMessageBrokerWithBiztalkServer. Retrieved 2010-10-14. 
5. ^ "Proteus - An Open Source EAI Message Broker". Info-scape.com. http://www.info-scape.com/proteus/. Retrieved 2010-10-14. 
6. ^ Introduction Messaging^{[dead link]}
7. ^ "SAP NetWeaver Capabilities - SOA Middleware". Sdn.sap.com. http://www.sdn.sap.com/irj/sdn/pi. Retrieved 2010-10-14. 
8. ^ "Sapo Broker - SOA Middleware". Softwarelivre.sapo.pt. http://softwarelivre.sapo.pt/broker. Retrieved 2010-10-14. 
9. ^ "pypubsub.sourceforge.net". pypubsub.sourceforge.net. http://pypubsub.sourceforge.net. Retrieved 2010-10-14. 
10. ^ "Sybase.com". Sybase.com. http://www.sybase.com/products/allproductsa-z/e-bizimpact. Retrieved 2010-10-14. 
11. ^ [www.axway.com "DIPS"]. www.axway.com. 

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