||It has been suggested that this article be merged into Middleware. (Discuss) Proposed since September 2010.|
Message broker is an intermediary program which translates the language of a system from one clarify] to another by way of a telecommunications medium.[
A message broker is an architectural pattern for message validation, message transformation and message routing. 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 pattern.
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
- Apache ActiveMQ
- Comverse Message Broker (Comverse Technology)
- Antares Enovacom
- eSCL Message Broker (Interface & Control Systems)
- FUSE Message Broker (enterprise ActiveMQ)
- Financial Fusion Message Broker (Sybase)
- JBoss Messaging (JBoss)
- Microsoft BizTalk Server (Microsoft)
- Oracle Message Broker (Oracle Corporation)
- Proteus an open source implementation by Info-Scape
- WebSphere Message Broker (IBM)
- webMethods Message Broker (webMethods Message Broker)
- Cloverleaf (E-Novation Lifeline)
- SAP PI (SAP AG)
- Sapo Broker (Portugal Telecom)
- Python Message Service
- e-Biz Impact (Sybase, Inc)
- Spread Toolkit
- Niklas message broker by Copernicus
- RabbitMQ (Mozilla Public License, written in Erlang)
- Axway Integration Broker
- Tarantool, a NoSQL database, with a set of stored procedures for message queues
See also 
- "Hub and Spoke [or] Zen and the Art of Message Broker Maintenance". Enterprise Integration Patterns. 2003-11-12. Retrieved 2010-10-14.
- "the eSCL Message Broker". Interfacecontrol.com. Retrieved 2010-10-14.
- "The Official Microsoft WPF and Windows Forms Site". Patternshare.org. Retrieved 2010-10-14.
- "Proteus - An Open Source EAI Message Broker". Info-scape.com. Retrieved 2010-10-14.
- Introduction Messaging[dead link]
- "SAP NetWeaver Capabilities - SOA Middleware". Sdn.sap.com. Retrieved 2010-10-14.
- "Sapo Broker - SOA Middleware". Softwarelivre.sapo.pt. Retrieved 2010-10-14.
- "sourceforge.net/projects/pubsub/". Retrieved 2012-08-15.
- "Sybase.com". Sybase.com. Retrieved 2010-10-14.
- "Niklas - An Open Source Message Broker".
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