4.Introduction to BPEL

8/8/2019 4.Introduction to BPEL

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Introduction to BPEL


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Lesson Objectives

After completing this lesson, you should beable to do the following:

Build a synchronous BPEL processDeploy the BPEL process to the BPEL Server Initiate the processManage and administer the process


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Introduction to BPEL

BPEL:Is a technology to create a program that can invoke webservices but presents a very intuitive flow-chart type

representation that can be easily understood and modifiedMore technically, it is a markup language for composinga set of discrete services into an end-to-end processflow

BPEL Process is a web service, hence has a WSDL

document that describes its operationinvokes operations described in interfaces in the WSDL of other services.


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Orchestration Requirements

Process orchestration coordinates services in a process from a singlerun-time environmentOrchestration should enable us to create:

Business processes from services and human activitiesIntegration flows to integrate various applications

Orchestration requirements include:Execution sequencing including serial, parallel, or other kinds of control flowdependency patternsException handling including transactions and compensationsData flow and manipulationEvent handling including timers and other out-of-band events

Why am I telling you about Orchestration!BPEL is a standard for business process orchestration


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BPEL Process Manager

Oracle BPEL Process Manager is implementation of the BPEL standard .T he Oracle BPEL Process Manager consists of the three components.Each component enables you to perform a specific set of tasks :

The design environment (Oracle JDeveloper) enables you to design anddeploy BPEL processes.The BPEL Server is where the process is deployedBPEL Control can be used to run and monitor the BPEL process


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D escribing Oracle BPEL ProcessD

esigner

A pplication Navigator

Editor

Component Palette

Property Inspector

Log Window


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T he Hello Process


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C reating the Hello Process

Create connection to the application server and to the BPEL and ESB Server


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C reate the workspace and add project

Create a new workspace and a new BPELsynchronous project template


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C reate a skeleton synchronous process

By selectingSynchronous BPEL

Process, a skeleton iscreated along with all of

the necessary sourcefiles are created.


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A natomy of a BPEL ProjectWorkspace

BPEL deployment descriptor:Contains metadata regardingthe Hello process

BPEL source file:Definition of this BPEL process

WSDL interface of this process:A client uses this interface toinitiate the Hello BPEL process

Project file

Schema file


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A dding an A ctivity to the Process Flow

Example: Assigning text to an output message.

Drag an A ssign activityand drop it between the

receiveInput andreplyOutput activities


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C reating a C opy Rule


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V iewing the WS D L Source

Types

Messages

Port types

Partner Links


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BPEL Process Source Structure


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What next?

After development, the BPEL process needsto be deployedDeploying means putting the process in theBPEL server.Deployment can be achieved through

JDeveloper

Command prompt


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D eploying where?

If you want to use JDeveloper for deploying theprocess, you need to create connection fromJDeveloper to the BPEL Server

BPEL server is running in Application server Recall that the application server houses BPEL, ESB andother servers

Hence we need to create two connections

Application Server Connection to the Oracle ApplicationServer Integration Server Connection to the BPEL Server thatutilizes the AS connection created above


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C reating C onnection to A ppServer

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C reate connection to BPEL Server

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Building and D eploying the process

After creating the process, we need to compile andbuild it.When you build your process, all of the processcomponents are packaged into a BPEL suitcase JAR

file.The JAR file can be deployed to any Oracle BPELProcess Manager server, simply by copying it into theappropriate deployment directory.JDeveloper uses ANT to build the BPEL process. It

generates a b u i l d.xm l file that builds and deploysthe suitcase to your local servers default domain, inthis case%ORACLE_HOME%\bpel\domains\default\tmp


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D eploying the process

To build and deploy the Hello BPEL process:1. In the Applications Navigator, right-click the Hello project

and select Deploy > MyBpelServer > Deploy to defaultdomain .

2. Verify that the process compiled and deployed successfully byreviewing the message text in the Messages tab in the Logwindow of JDeveloper

Deploying a BPEL process makes it a service. This

is made possible by automatic addition of

and tag to the WSDL during deployment.


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Oracle BPEL C onsole

BPEL Console lists all the deployed processesBPEL Console can be used for

Invoking a BPEL process with appropriate input

Viewing completed, in process and failed instancesViewing the flow in an instanceViewing messages exchanged in an instanceDeploying, undeploying a process

Purging instance and sensor dataBPEL Admin activities


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BPEL C onsole D ashboard

The Dashboard shows all the deployed processes


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Initiate a process


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V iew the Response


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See the V isual Flow of the process


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Managing and A dministering

BPEL console can be used to manage theprocess that includes

Viewing all in-flight, closed and failed instancesDeploying a BPEL Process if jar is available

Undeploying a BPEL processBulk operations like undeploying, retiring

Setting log levels

4.Introduction to BPEL

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