Styles of Applicaton Integration Using Spring

Styles of Applicaton Integration Using Spring
Styles of Application Integration Using Spring Bruce Snyder, Senior Software Engineer, SpringSource/VMware Friday, July 15, 2011
Integrations Are About Coupling 2 Friday, July 15, 2011
Where Coupling Exists, Concerns Arise • Tight coupling is easy • Loose coupling can be difficult • Tight coupling causes issues in the long run • Loose coupling pays off in the long run • Integrations are usually tightly coupled • Integrations should be loosely coupled • Integrations are commonly addressed using commands • Integrations should be addressed using events Friday, July 15, 2011
What is Coupling? “... the degree to which each program module relies on each one of the other modules” (Wikipedia.com) • Given two lines of code, A and B, they are coupled when B must change behavior only because A changed 4 Friday, July 15, 2011
Characteristics Tight Coupling • Components are highly dependent upon one another • Components are directly linked • Changes in one component cause a ripple effect • Less reusability • More difficult to maintain • Does not handle unforeseen change well • Examples – Clients designed to interact only with specific systems – Use of proprietary APIs or commands for interaction – Components designed to work specifically with other components 5 Friday, July 15, 2011
Characteristics of Loose Coupling • Components have little or no knowledge of one another • Components are not directly linked to one another • Changes in one component do not affect other components • Increased reusability • Easier to maintain • More easily handles unforeseen changes • Examples – Dependence upon interfaces instead of concrete classes – Use of DI encourages looser coupling – A design using a level of indirection 6 Friday, July 15, 2011
Tight Coupling is Easy • App design with tight coupling is more widely understood • App development with tight coupling requires less time • Debugging a tightly coupled app is easier • Benefits of tight coupling are seen immediately • Tightly coupled prototypes commonly live on 7 Friday, July 15, 2011
Loose Coupling is Difficult • App design with loose coupling is not widely understood • App development with loosely coupling requires more thought and more time • Debugging loosely coupled apps is different • Benefits of loose coupling are only seen over time 8 Friday, July 15, 2011
Integrations and Coupling • But it’s easy to write a point-to-point, one-off piece of code for integration! • Too many disadvantages – Difficult to maintain – No reusability – Every integration is unique – Bites you over time 9 Friday, July 15, 2011
Integrations and Coupling • But designing integrations to be loosely coupled requires too much work! • With the right knowledge and preparation, it doesn’t need to be this way 10 Friday, July 15, 2011
Commands vs. Events • Commands are not natural – Verify credit card • Commands are too specific • Events are natural – Order received • Events are more broad • Events are what happen in the real world 11 Friday, July 15, 2011
Enterprise Integration Patterns (EIP) http://enterpriseintegrationpatterns.com/ 12 Friday, July 15, 2011
Spring Integration • Provides both concurrency and messaging – Message Endpoints • Connections between services – Channel Adapters • Adapter between application and message broker – Messaging Gateways • Provides uni-directional or bi-directional messaging – Service Activators • Invokes a services based on an incoming message – Routers • Determines where to dispatch a message – Splitters and Aggregators • Breaks up a message and reassembles it after processing 13 Friday, July 15, 2011
Spring Integration • Supports – AMQP – Email – File system – Gemfire – JMS – JMX – MongoDB – Redis – Spring Batch – Testing – Web Services 14 Friday, July 15, 2011
Spring Integration 15 Friday, July 15, 2011
Types of Integration • Intra-application integration • Inter-application integration • External system integration 25 Friday, July 15, 2011
Typical Application Layers 26 Friday, July 15, 2011
Intra-Application Integration 27 Friday, July 15, 2011
Spring Integration Config <int:gateway id="sender" service-interface="org.bsnyder.spring.integration.simple.Sender"/> <int:channel id="orderReceived"/> <int:service-activator input-channel="orderReceived" ref="receiver" method="receive" /> <bean id="receiver" class="org.bsnyder.spring.integration.simple.Receiver"/> 28 Friday, July 15, 2011
Intra-Application Integration 29 Friday, July 15, 2011
Spring Integration Config <int:gateway id="sender" service-interface="org.bsnyder.spring.integration.appa.Sender"/> <channel id="orderReceived" /> <amqp:outbound-channel-adapter channel="orderReceived" exchange-name="order.received.exchange" routing-key="order.received.binding" amqp-template="amqpTemplate" /> <rabbit:connection-factory id="connectionFactory" /> <rabbit:template id="amqpTemplate" connection-factory="connectionFactory" /> <rabbit:admin connection-factory="connectionFactory" /> <rabbit:queue name="order.received.queue" /> <rabbit:direct-exchange name="order.received.exchange"> <rabbit:bindings> <rabbit:binding queue="order.received.queue" key="order.received.binding" /> </rabbit:bindings> </rabbit:direct-exchange> 30 Friday, July 15, 2011
Spring Integration Config <amqp:inbound-channel-adapter channel="orderReceived" queue-names="order.received.queue" connection-factory="connectionFactory" /> <int:service-activator input-channel="orderReceived" ref="receiver" method="receive" /> <bean id="receiver" class="org.bsnyder.spring.integration.appa.Receiver"/> <rabbit:connection-factory id="connectionFactory" /> <rabbit:template id="amqpTemplate" connection-factory="connectionFactory" /> <rabbit:admin connection-factory="connectionFactory" /> <rabbit:queue name="order.received.queue" /> <rabbit:direct-exchange name="order.received.exchange"> <rabbit:bindings> <rabbit:binding queue="order.received.queue" key="order.received.binding" /> </rabbit:bindings> </rabbit:direct-exchange> 31 Friday, July 15, 2011
32 Friday, July 15, 2011
Inter-Application Integration 33 Friday, July 15, 2011
Inter-Application Integration 34 Friday, July 15, 2011
Spring Integration Config <int:gateway id="sender" service-interface="org.bsnyder.spring.integration.appa.Sender"/> <channel id="orderReceived" /> <amqp:outbound-channel-adapter channel="orderReceived" exchange-name="order.received.exchange" routing-key="order.received.binding" amqp-template="amqpTemplate" /> <rabbit:connection-factory id="connectionFactory" /> <rabbit:template id="amqpTemplate" connection-factory="connectionFactory" /> <rabbit:admin connection-factory="connectionFactory" /> <rabbit:queue name="order.received.queue" /> <rabbit:direct-exchange name="order.received.exchange"> <rabbit:bindings> <rabbit:binding queue="order.received.queue" key="order.received.binding" /> </rabbit:bindings> </rabbit:direct-exchange> 35 Friday, July 15, 2011
Spring Integration Config <amqp:inbound-channel-adapter channel="orderReceived" queue-names="order.received.queue" connection-factory="connectionFactory" /> <int:service-activator input-channel="orderReceived" ref="receiver" method="receive" /> <bean id="receiver" class="org.bsnyder.spring.integration.appb.Receiver"/> <rabbit:connection-factory id="connectionFactory" /> <rabbit:template id="amqpTemplate" connection-factory="connectionFactory" /> <rabbit:admin connection-factory="connectionFactory" /> <rabbit:queue name="order.received.queue" /> <rabbit:direct-exchange name="order.received.exchange"> <rabbit:bindings> <rabbit:binding queue="order.received.queue" key="order.received.binding" /> </rabbit:bindings> </rabbit:direct-exchange> 36 Friday, July 15, 2011
External System Integration 38 Friday, July 15, 2011
Spring Integration Config <int:gateway id="sender" service-interface="org.bsnyder.spring.integration.appa.Sender"/> <bean id="ftpClientFactory" class="org.springframework.integration.ftp.session.DefaultFtpSessionFactory" p:host" value="localhost" p:username" value="${user}" p:password="$ {password}"/> ! <int:channel id="ftpChannel"/> <int-ftp:outbound-channel-adapter id="ftpOutbound" channel="ftpChannel" remote-directory="/foo/bar/baz/" client-factory="ftpClientFactory"/> 39 Friday, July 15, 2011
Spring Integration Config <int:channel id="ftpChannel"> <int:queue/> </int:channel> <bean id="ftpClientFactory" class="org.springframework.integration.ftp.session.DefaultFtpSessionFactory" p:host="localhost" p:username="${user}" p:password="${password}"/> ! <int-ftp:inbound-channel-adapter id="ftpInbound" channel="ftpChannel" session-factory="ftpClientFactory" filename-regex=".*.txt$" auto-create-local-directory="true" delete-remote-files="false" remote-directory="/foo/bar/baz/" local-directory="file:local-target-dir"> <int:poller fixed-rate="1000"/> </int-ftp:inbound-channel-adapter> <int:service-activator input-channel="ftpChannel" ref="receiver" method="receive" /> <bean id="receiver" class="org.bsnyder.spring.integration.appb.Receiver"/> 40 Friday, July 15, 2011
Combined Integration 42 Friday, July 15, 2011
Thank You! Q&A Friday, July 15, 2011

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