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Introduction to Mule ESB

Agenda• What is Mule?• How do you use Mule?• What are the core Mule concepts?• Learning mule with File endpoints

Enterprise Service Backbone

• Mule is an open-source Enterprise Service Backbone(ESB)

Mule – Advanced Technologies

•SEDAStaged Event-Driven Architecture

•Java NIOJava New Input/Output

Mule’s “Moves Things Around”• Folder to folder• Queue to queue• Shared memory to shared memory• Using different types of transports• In a flexible way

XML Pipeline

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• An XML pipeline is a series of operation thatare performed on one or more XML files

• Examples include:– validate– transform– prune (remove nodes)– split (break a single XML file into many files)– merge (join two or more files together)

CRV Example

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• Flow of XML document through approval processes

SubmitCRV

Deed Matched CRV

SSNStrippedCRV

Income Tax Audit

County Audit

CountyApproval

State Audit

StateApproval

Decomposition

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• Example of XML Operations used on CRV

Validate Split

Remove SSNElement

Store

Modify Value

AddElement

Modify Value

Add Element

Core Mule Concepts

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• Mule Manager• Mule Model• Universal Message Object (UMO)• Endpoints• External Applications

Universal Message Object (UMO)

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• A UMO is a type of Java object that can– receive events "from anywhere"– send events

• UMO Components are usually your business objects. They are components that execute business logic on an incoming event

• UMO are standard JavaBeans (containers)• There is no Mule-specific code in your components• Mule handles all routing and transformation of events to

and from your objects based on the configuration of your component

Mule Event Flow

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• The nine stages of a mule event– first 2 – inbound– middle 4 – component– last 2 – outbound

Endpoint(Message Receiver)

Endpoint(Message Dispatcher)

Inbound Router

Outbound Router

Inbound Transformer

Outbound Transformer

Interceptor

Service Invocation

Interceptor

Inbound

Component

Outbound

Optional Step

Built-in Router Classes

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Outbound Response

Filtering Outbound Router Response Aggregator

Recipient List

Multicasting Router

Chaining Router

Message Splitter

Filtering List Message Splitter

Filtering Xml Message Splitter

Exception Based Router

Exception Handling

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• Mule has a special way of handling non-happy path processing.This is called an "Exception Strategy" but is it really just and exception path and there is very little strategy involved.

• There are three places you can associate an exception strategy– connector– component– model (set for all components in a model)

Exception Strategy

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• We want all invalid documents to be moved into theerror folder.

<exception-strategy className=org.mule.impl.DefaultComponentExceptionStrategy">

<endpoint address="file:///c:/mule-class/error"/></exception-strategy>

Who will benefit?

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Developers, Enterprise Architects and Development Managers having

knowledge in JAVA

Thank you

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