introduction to es bs mule

ByAchyuta Laxmi

What is an ESB? Java Business Integration (JBI) Mule Architecture Mule in the Real World

[Mul] Mule Architecture Guide. http://mule.mulesource.org/display/MULE/Architecture+Guide

September [mule-user archive]

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

Gartner Group

Giant exercise in Separation of Concerns

[Ric]

[Ric]

Routing Message Transformation Message Enhancement Protocol Transformation Service Mapping

Message Processing Process Choreography Service Orchestration Transaction Management Security

[Ric]

General case

Client calls Choreographer Client calls Mediator

vs

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

XSLT – message transformation PXE – choreography Groovy – scripting

[Ric]

Service Mix

Binding Components

Service Engines

[Mule]

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

http://myapp.com pop3://user@userland.comhttp→xml xml→pop3

myUMO (xml→xml)

[Mule]

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

Requires a component resolver (e.g., Spring or Pico) for Instantiation of UMOsConfiguration of UMOs

Event processingAsynchronousSynchronousRequest-Response

[Mule]

Application logic

Application glue

Mule glue

[Mule]

[Mule]

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>

<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://ross@muleumo.org"/><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>

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>

September [mule-user archive]How to get a hold of Endpoint object from

the component? {mule}Failed to throw UserDefined Exception

{jaxws}Failed to invoke lifecycle “start” using CXF

in JBOSS {cxf}Problem in loading xsd files {mule}Problems with RemoteDispatcher {mule} Inject MuleClient Singleton with Spring

{mule}Mule transaction support {mule}

Routing Message Transformation Message Enhancement Protocol Transformation Service Mapping

Message Processing Process Choreography Service Orchestration Transaction Management Security

XX

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Mule’s generality results in great flexibility, but at the cost of great complexity for users

Mule is the focal point of ambiguity and difficulties with many standards-based packages

Mule delivers (to a degree) on: Integration, flexibility, decentralized

operation, scalability

Mule doesn’t deliver (so much) on: Runtime refactoring, conceptualization