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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
2
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
4
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

Time for action – creating XML Schema for the BPEL process

Before we can start developing our BPEL process, we have to specify the XSD elements used for the input and output messages (for the request and the response message). Also, the XSD elements are used for variables within the BPEL process.

The XML schema has already been created and can be found in the BookstoreABPEL.xsd file. The default XSD elements for request and response contain only strings, which are not adequate for our example. Therefore, we will modify it.

First, we will rename it from BookstoreABPEL.xsd to BookstoreBPEL.xsd. The reason is that we might use same XSD for more than one bookstore, so we would like to have a generic XSD filename.

Our request element consists of the following elements: book ISSN, book title, edition, and date of publishing. The response element consists of the following elements: book ISSN and stock quantity.

We will perform the following steps:

  1. To rename XSD, right-click on the BookstoreABPEL.xsd file in the project tree, select Refactor, and then Rename:
    Time for action – creating XML Schema for the BPEL process
  2. In the dialog box, enter the new name, BookstoreBPEL.xsd.
  3. Double-click on the BookstoreBPEL.xsd file in the Schemas folder and switch to source view.
  4. We have to define two complex elements. First, edit the existing process element, rename it to the BookData element, and enter the code shown in the following screenshot:
    Time for action – creating XML Schema for the BPEL process
  5. Next, define the content of the processResponse element, which we will rename to BookDataResponse and add the two elements shown in the following screenshot:
    Time for action – creating XML Schema for the BPEL process

Before we continue, let's save the XSD file.

What just happened?

We created the XSD elements used by the BPEL process. To be more accurate, we modified the autogenerated XSD file and specified the request element (BookData) and the response element (BookDataReponse).

The request element (BookData) is used as the input for the initial receive activity (receiveInput). The response element (BookDataReponse) is used by the final reply activity (replyOutput).

This is specified in the autogenerated WSDL file, which you can find in the WSDLs folder. It is named BookstoreABPEL.wsdl. Let's have a look at it.

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