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Discover the not so new but wonderful world of the Message Brokers, also known as part of the MOM, Message Oriented Middlewares.
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An overview of message brokers
• Definitions
• Messaging Systems : purpose & features
• Frameworks
• Use Cases, Demo
• Conclusion
Agenda
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• Component of « MOM », Message Oriented Middleware • An architectural pattern for message validation,
transformation and routing. • Mediate communication amongst applications,
minimizing the mutual awareness that application should have of each other, effectively implementing decoupling
Integrate applications without enforcing a common interface
Message Broker
• Route messages to one or more of many destinations (unicast / multicast)
• Transform messages to an alternative representation (mapping)
• Perform message aggregation, decomposition/recomposition of messages
• Respond to events or errors (“triggering”)
• Provide content and topic-based message routing using the publish–
subscribe pattern.
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Purpose
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Characteristics & Features
Producer (multiple or not)
push Broker pull Consumer (multiple or not)
• Topology (1-1, 1-N, N-N)
• Compression
• Timed or permanent persistence
• Disconnect detection, error recovery
• Acknowleding, ordering, retries
• Guaranteed delivery
• Combination of features : delivery + ordering : “EOID” exactly once in order
JMS Implementations Active MQ, Jboss Messaging, Glassfish
AMQP Implementations Rabbit MQ
Lightweight / non-standardized ZeroMQ, Finagle, Kafka, Beanstalkd
Commercial MOMs IBM Websphere MQ, MSMQ (Microsoft) BEA Weblogic, SAP Netweaver
Enterprise Service Buses Biztalk, Websphere, Oracle Service Bus
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Common Apps
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AMQP • Some key AMQP messaging protocol requirements
– Internet protocol - like HTTP, TCP –
but ASYNCHRONOUS
– Where to send messages (Routing)
– How to get there (Delivery)
– What goes in must come out (Fidelity)
- Each message is stateless - Consumers create queues; these buffer messages for push to consumers - Queues are stateful, ordered, and can be persistent, transient, private, shared. - Exchanges are stateless routing
tables.
• Implements AMQP
• Written in Erlang, a functional language known for its ability for concurrent processing, and backed by Mnesia, Erlang’s powerful persistence database.
• Used by NASA’s Nebula Cloud Computing Platform, VMWare, AT&T Interactive, Digg, BBC, Nokia and ….
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RabbitMQ
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Unibet use of Rabbit MQ
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Unibet and RabbitMQ
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What about SQL Server Service Broker?
SQL Server Service Broker : - native support for messaging and queuing applications - use the Sql Server Database Engine components to communicate between disparate databases. - handles the communication paths in the context of transactioned conversation.
• http://fr.slideshare.net/MaxAlexejev/modern-distributed-messaging-and-rpc
• http://msdn.microsoft.com/en-us/library/ms978706.aspx : « broker » pattern
• http://blog.pasker.net/2008/06/16/you-might-need-messaging-if/ : why you might need messaging
• http://fr.slideshare.net/somic/introduction-to-amqp-messaging-with-rabbitmq/ : AMQP functionnalities in detail
• http://libfugu.so/blog/2013/09/24/rabbitmq-a-quick-and-dirty-introduction
• http://www.rabbitmq.com/resources/RabbitMQ_usecase_StefanNorberg_Unibet_10xScalabilityAtHalfTheCost.pdf : Rabbit MQ at Unibet, the story of Kevin and his candy bag
• http://www.codeproject.com/Articles/11795/Introducing-Distributed-Messaging-using-Service-Br : good description of Sql Server Service Broker
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Links
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