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  • Book Overview & Buying WS-BPEL 2.0 Beginner's Guide
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WS-BPEL 2.0 Beginner's Guide

WS-BPEL 2.0 Beginner's Guide

By : Matjaz B Juric
4.8 (5)
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WS-BPEL 2.0 Beginner's Guide

WS-BPEL 2.0 Beginner's Guide

4.8 (5)
By: Matjaz B Juric
Buy this Book

Overview of this book

If you are a software architect, a designer, a software developer, an SOA and BPM architect, a project manager, or a business process analyst who is responsible for the design and development of business processes, composite applications, and BPM/SOA solutions, then this book is for you. You should have a clear grasp of general SOA concepts including business processes and web services, but no prior knowledge of the BPEL language is required.
Table of Contents (14 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Time for action – heading
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Reader feedback
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Customer support
Lock Free Chapter
1
1. Hello BPEL
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1. Hello BPEL
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Introduction to BPEL
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Installing Oracle JDeveloper and SOA Suite
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Time for action – installing the JDK and setting environment
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Time for action – installing JDeveloper and SOA Suite
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Time for action – creating a default domain
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Developing our first BPEL process
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Time for action – creating the SOA composite application
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Time for action – creating XML Schema for the BPEL process
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Time for action – modifying WSDL
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Time for action – implementing the BPEL process
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Deploying the first BPEL process
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Time for action – deploying the BPEL process
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Testing our first BPEL process
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Time for action – testing the BPEL process
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Understanding the BPEL language
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The BPEL structure
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Bookstore BPEL process with branches
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Time for action – more sophisticated BPEL process
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Time for action – deploying and testing the second BPEL process
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Summary
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2. Service Invocation
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2. Service Invocation
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Service invocation and orchestration
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Developing the book warehousing process
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Time for action – creating the book warehousing process
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Time for action – developing the book warehousing process
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Understanding sequential invocation
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Understanding partner links
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Parallel service invocation
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Time for action – developing parallel flows
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Understanding a parallel flow
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Summary
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3. Variables, Data Manipulation, and Expressions
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3. Variables, Data Manipulation, and Expressions
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Variables in BPEL
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Variables in BookWarehousingBPEL
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Time for action – review of existing variables
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Time for action – creating XML type variables
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Time for action – creating XML element variables
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Time for action – creating a message type variable
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Data manipulation and assignments
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Time for action – copying variables
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Expressions
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Time for action – copying variable parts
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Manipulating data for external partner links
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Time for action – creating the AnotherBookstoreBPEL process
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Time for action – extending the BookWarehousing process
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Validating variables
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Time for action – validating variables
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The XSLT transformations
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Time for action – using XSLT transformations
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Summary
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4. Conditions and Loops
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4. Conditions and Loops
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Conditions
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Time for action – selecting the bookstore with the lowest quantity
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Time for action – implementing VintageBookstore
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Time for action – selecting VintageBookstore
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Loops
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Adding loops to our example
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Time for action – adding the BookOrderManagement process
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Time for action – adding the loop
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Time for action – the loop
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Executing in parallel
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Time for action – executing in parallel
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Delays
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Time for action – adding
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Ending a process
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Empty activities
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Summary
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5. Interaction Patterns in BPEL
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5. Interaction Patterns in BPEL
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Understanding asynchronous invocations
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Time for action – implementing an asynchronous invocation
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Understanding asynchronous service invocations
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Time for action – creating an asynchronous BPEL process
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Summary
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6. Fault Handling and Signaling
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6. Fault Handling and Signaling
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Introducing faults and fault handlers
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Time for action – adding fault handlers
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Modeling execution errors with WS-BPEL 2.0 standard faults
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Modeling logical (explicit) errors with the activity
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Modeling errors propagated from external web services
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Understanding fault handlers and signaling
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WSDL faults
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Handling faults
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In-line fault handling
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Time for action – signaling faults
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Summary
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7. Working with Scopes
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7. Working with Scopes
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Introducing scopes
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Time for action – adding scopes
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Time for action – the fault and termination handlers
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Summary
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8. Dynamic Parallel Invocations
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8. Dynamic Parallel Invocations
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Introducing dynamic parallel invocations
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Time for action – adding a activity
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Time for action – configuring the activity within a activity
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Time for action – initializing the input variable within a activity
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Initializing a dynamic partner link
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Time for action – initializing a dynamic partner link
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Time for action – appending multiple values to a variable
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Summary
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9. Human Tasks
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9. Human Tasks
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Understanding human tasks
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Preparing an asynchronous example
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Adding a human task to the BookWarehousingBPEL process
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Time for action – creating a human task definition
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Time for action – configuring the human task title
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Time for action – specifying a human task payload
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Time for action – assigning a human task
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Time for action – configuring human task deadlines
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Time for action – configuring human task notifications
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Time for action – invoking a human task from the BPEL process
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Time for action – configuring human task case branches
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Time for action – creating human task forms
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Deploying and testing human tasks
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Time for action – deploying the human task
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Time for action – testing the human task
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Summary
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10. Events and Event Handlers
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10. Events and Event Handlers
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Understanding events
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Developing an event-driven BPEL process
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Time for action – declaring a business event
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Time for action – developing an event-driven book shelving BPEL process
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Triggering a business event from a BPEL process
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Time for action – triggering BookshelfEvent from the book warehousing BPEL process
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Adding an event handler to the Book Warehousing BPEL process
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Time for action – adding an event handler to the BPEL process
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Time for action – adding onEvent to the callback interface
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Time for action – specifying alarm event handler activities
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Time for action – adding a message handler to the BPEL process
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Time for action – declaring the cancel operation on the BPEL process interface
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Time for action – specifying message event activities
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Asynchronous invocations and events
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Time for action – invoking the WarehousingConfirmation service
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Time for action – waiting for callback
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Time for action – waiting for onFault and onEvent callbacks
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Time for action – adding an alarm event for callback
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Summary
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11. Compensations
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11. Compensations
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Introducing compensation in business processes
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Time for action – adding compensation handlers
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Time for action – triggering a fault within the BPEL process
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Time for action – triggering compensation for the BPEL process
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Summary
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A. Pop Quiz Answers
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Chapter 1, Hello BPEL
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Chapter 2, Service Invocation
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Chapter 3, Variables, Data Manipulation, and Expressions
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Chapter 4, Conditions and Loops
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Chapter 5, Interaction Patterns in BPEL
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Chapter 6, Fault Handling and Signaling
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Chapter 7, Working with Scopes
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Chapter 8, Dynamic Parallel Invocations
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Chapter 9, Human Tasks
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Chapter 10, Events and Event Handlers
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Chapter 11, Compensations
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Index
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Index

Understanding the BPEL language

Let's now have a more detailed look into what we did and try to understand what a BPEL process is. A BPEL process is basically a piece of source code with the .bpel extension, which is executed on a process server. BPEL uses the XML vocabulary to write the code. So far, we have used the visual editor to compose the BPEL process. However, we can switch to the source code view.

A BPEL process consists of steps. Each step is called an activity. BPEL supports basic and structured activities. Basic activities represent basic constructs and are used for common tasks listed, as follows:

  • Invoking other web services using <invoke>
  • Waiting for the client to invoke the business process through sending a message using <receive> (receiving a request)
  • Generating a response for synchronous operations using <reply>
  • Manipulating data variables using <assign>
  • Indicating faults and exceptions using <throw> and <rethrow>
  • Waiting for some time using <wait>
  • Terminating the entire process using <exit>

We can then combine these and other basic activities and define complex flows that specify exactly the steps of a business process. To combine basic activities, BPEL supports several structured activities. The most important are as follows:

  • Sequence (<sequence>) for defining a set of activities that will be invoked in an ordered sequence
  • Flow (<flow>) for defining a set of activities that will be invoked in parallel
  • Conditional construct (<if>) for implementing branches
  • While, repeat, and for each (<while>, <repeatUntil>, <forEach>) for defining loops
  • The ability to select one of the number of alternative paths using <pick>

Each BPEL process will also define partner links using <partnerLinks>. Partner links are other services that use the BPEL process or are used by the BPEL process. A BPEL process also declares variables using <variables>.

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