introduction to mule esbs
TRANSCRIPT
INTRODUCTION TO ESBS:MULE
By Prabhat Gangwar
AGENDA What is an ESB? Java Business Integration (JBI) Mule Architecture Mule in the Real World
PROBLEMS ADDRESSED BY ESBS Integration of existing systems Refactorable in real time Flexibility to change as requirements change Decentralized (service-location transparency) Scalable (point solutions to full enterprise) Sharing of services across enterprise Ability to separate Business Services from
Service Implementations Leverages standards
DEFINITION(S)
Gartner Group
Giant exercise in Separation of Concerns
ESB FEATURES
Routing Message Transformation Message Enhancement Protocol Transformation Service Mapping
Message Processing Process Choreography Service Orchestration Transaction Management Security
AN ESB BLUEPRINT
General case
Client calls Choreographer Client calls Mediator
vs
JAVA BUSINESS INTEGRATION (JBI) JSR-208 Standard Defines service engines (SE – choreographers,
transformers, security, etc) and binding components (BC – xml, http, etc)
Concerned with how internal customers (not external services) interact with service providers
COTS
JBI EXAMPLE
XSLT – message transformation PXE – choreography Groovy – scripting
JBI CASE STUDY: SERVICE MIX
Service Mix
Binding Components
Service Engines
MULE ARCHITECTURE
MULE FLOW VIEW
Channel – a method of connecting between two points (not part of Mule) Connector – a transport provider (e.g., http, jms, soap, smtp, etc) implementing message receive and message dispatch Transformer – converts message structure/format (e.g., http to xml) Router – moves messages amongst UMOs and connectors
MULE TRANSPORTS AS400 DQ EJB E-mail File FTP HTTP IMAP JDBC
JMS Multicast POP3 Quartz
RMI Servlet SMTP SOAP
SSL Stream TCP UDP VFS VM WSDL XMPP
UMO EXECUTION Requires a component resolver (e.g., Spring
or Pico) for Instantiation of UMOs Configuration of UMOs
Event processing Asynchronous Synchronous Request-Response
MULE PROGRAMMING MODEL
Application logic
Application glue
Mule glue
MULE ROUTERS
SELECTIVE CONSUMER (INBOUND) Applies one or more filters to incoming payload, then branch based on filter<inbound-router>
<catch-all-strategy className="org.mule.routing.ForwardingCatchAllStrategy">
<endpoint address="jms://topic:error.topic"/></catch-all-strategy>
<router className="org.mule.routing.inbound.SelectiveConsumer">
<filter expression="msg/header/resultcode = 'success'"
className="org.mule.routing.filters.xml.JXPathFilter"/></router>
</inbound-router>
FILTERING OUTBOUND (OUTBOUND)<outbound-router>
<catch-all-strategy className="org.mule.routing.ForwardingCatchAllStrategy">
<endpoint="jms://error.queue"/></catch-all-strategy>
<router className="org.mule.routing.outbound.FilteringOutboundRouter"><endpoint address="smtp://[email protected]"/><filter expectedType="java.lang.Exception"
className="org.mule.routing.filters.PayloadTypeFilter"/></router>
<router className="org.mule.routing.outbound.FilteringOutboundRouter"><endpoint address="jms://string.queue"/><filter className="org.mule.routing.filters.logic.AndFilter">
<left-filter expectedType="java.lang.String"className="org.mule.routing.filters.PayloadTypeFilter"/><right-filter pattern="the quick brown (.*)"className="org.mule.routing.filters.RegExFilter"/>
</filter></router>
</outbound-router>
NESTED ROUTER Allows synchronous callouts that can be intercepted and routed
<mule-descriptor name="InvokerComponent" implementation="org.mule.foo.Invoker"><inbound-router>
<endpoint address="jms://Invoker.in"/></inbound-router>
<nested-router><binding interface="org.mule.foo.HelloInterface">
<endpoint address="axis:http://192.168.2.14:81/services/HelloWebComponent?method=helloMethod" remoteSync="true"/>
</binding></nested-router>
<outbound-router><router
className="org.mule.routing.outbound.OutboundPassThroughRouter"><endpoint address="jms://Invoker.out"/>
</router></outbound-router>
</mule-descriptor>
ESB FEATURES
Routing Message Transformation Message Enhancement Protocol Transformation Service Mapping
Message Processing Process Choreography Service Orchestration Transaction Management Security
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