Mini-Training: Message Brokers

An overview of message brokers

• Definitions

• Messaging Systems : purpose & features

• Frameworks

• Use Cases, Demo

• Conclusion

Agenda

LEARN THE DIFFERENCE

IT COULD SAVE YOUR LIFE

• 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.

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Demo

• 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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Find out more

• On https://techblog.betclicgroup.com/

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