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WS-BPEL 2.0 Beginner's Guide

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WS-BPEL 2.0 Beginner's Guide

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WS-BPEL 2.0 Beginner's Guide
Sep, 2014 | 388 pages
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Table of Contents (19 chapters)
WS-BPEL 2.0 Beginner's Guide
WS-BPEL 2.0 Beginner's Guide
Credits
Credits
About the Authors
About the Authors
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Hello BPEL
Hello BPEL
Introduction to BPEL
Installing Oracle JDeveloper and SOA Suite
Time for action – installing the JDK and setting environment
Time for action – installing JDeveloper and SOA Suite
Time for action – creating a default domain
Developing our first BPEL process
Time for action – creating the SOA composite application
Time for action – creating XML Schema for the BPEL process
Time for action – modifying WSDL
Time for action – implementing the BPEL process
Deploying the first BPEL process
Time for action – deploying the BPEL process
Testing our first BPEL process
Time for action – testing the BPEL process
Understanding the BPEL language
The BPEL structure
Bookstore BPEL process with branches
Time for action – more sophisticated BPEL process
Time for action – deploying and testing the second BPEL process
Summary
2
Service Invocation
Service Invocation
Service invocation and orchestration
Developing the book warehousing process
Time for action – creating the book warehousing process
Time for action – developing the book warehousing process
Understanding sequential invocation
Understanding partner links
Parallel service invocation
Time for action – developing parallel flows
Understanding a parallel flow
Summary
3
Variables, Data Manipulation, and Expressions
Variables, Data Manipulation, and Expressions
Variables in BPEL
Variables in BookWarehousingBPEL
Time for action – review of existing variables
Time for action – creating XML type variables
Time for action – creating XML element variables
Time for action – creating a message type variable
Data manipulation and assignments
Time for action – copying variables
Expressions
Time for action – copying variable parts
Manipulating data for external partner links
Time for action – creating the AnotherBookstoreBPEL process
Time for action – extending the BookWarehousing process
Validating variables
Time for action – validating variables
The XSLT transformations
Time for action – using XSLT transformations
Summary
4
Conditions and Loops
Conditions and Loops
Conditions
Time for action – selecting the bookstore with the lowest quantity
Time for action – implementing VintageBookstore
Time for action – selecting VintageBookstore
Loops
Adding loops to our example
Time for action – adding the BookOrderManagement process
Time for action – adding the <while> loop
Time for action – the <forEach> loop
Executing <forEach> in parallel
Time for action – executing <forEach> in parallel
Delays
Time for action – adding <wait>
Ending a process
Empty activities
Summary
5
Interaction Patterns in BPEL
Interaction Patterns in BPEL
Understanding asynchronous invocations
Time for action – implementing an asynchronous invocation
Understanding asynchronous service invocations
Time for action – creating an asynchronous BPEL process
Summary
6
Fault Handling and Signaling
Fault Handling and Signaling
Introducing faults and fault handlers
Time for action – adding fault handlers
Modeling execution errors with WS-BPEL 2.0 standard faults
Modeling logical (explicit) errors with the <throw> activity
Modeling errors propagated from external web services
Understanding fault handlers and signaling
WSDL faults
Handling faults
In-line fault handling
Time for action – signaling faults
Summary
7
Working with Scopes
Working with Scopes
Introducing scopes
Time for action – adding scopes
Time for action – the fault and termination handlers
Summary
8
Dynamic Parallel Invocations
Dynamic Parallel Invocations
Introducing dynamic parallel invocations
Time for action – adding a <forEach> activity
Time for action – configuring the <invoke> activity within a <forEach> activity
Time for action – initializing the input variable within a <forEach> activity
Initializing a dynamic partner link
Time for action – initializing a dynamic partner link
Time for action – appending multiple values to a variable
Summary
9
Human Tasks
Human Tasks
Understanding human tasks
Preparing an asynchronous example
Adding a human task to the BookWarehousingBPEL process
Time for action – creating a human task definition
Time for action – configuring the human task title
Time for action – specifying a human task payload
Time for action – assigning a human task
Time for action – configuring human task deadlines
Time for action – configuring human task notifications
Time for action – invoking a human task from the BPEL process
Time for action – configuring human task case branches
Time for action – creating human task forms
Deploying and testing human tasks
Time for action – deploying the human task
Time for action – testing the human task
Summary
10
Events and Event Handlers
Events and Event Handlers
Understanding events
Developing an event-driven BPEL process
Time for action – declaring a business event
Time for action – developing an event-driven book shelving BPEL process
Triggering a business event from a BPEL process
Time for action – triggering BookshelfEvent from the book warehousing BPEL process
Adding an event handler to the Book Warehousing BPEL process
Time for action – adding an event handler to the BPEL process
Time for action – adding onEvent to the callback interface
Time for action – specifying alarm event handler activities
Time for action – adding a message handler to the BPEL process
Time for action – declaring the cancel operation on the BPEL process interface
Time for action – specifying message event activities
Asynchronous invocations and events
Time for action – invoking the WarehousingConfirmation service
Time for action – waiting for callback
Time for action – waiting for onFault and onEvent callbacks
Time for action – adding an alarm event for callback
Summary
11
Compensations
Compensations
Introducing compensation in business processes
Time for action – adding compensation handlers
Time for action – triggering a fault within the BPEL process
Time for action – triggering compensation for the BPEL process
Summary
Pop Quiz Answers
Pop Quiz Answers
Chapter 1, Hello BPEL
Chapter 2, Service Invocation
Chapter 3, Variables, Data Manipulation, and Expressions
Chapter 4, Conditions and Loops
Chapter 5, Interaction Patterns in BPEL
Chapter 6, Fault Handling and Signaling
Chapter 7, Working with Scopes
Chapter 8, Dynamic Parallel Invocations
Chapter 9, Human Tasks
Chapter 10, Events and Event Handlers
Chapter 11, Compensations
Index
Index

Time for action – selecting the bookstore with the lowest quantity

In the previous chapter, we introduced three bookstores into our composite BPEL application, BookstoreA, BookstoreB, and AnotherBookstore. Let's now modify the conditions in the <if> activity, where we select the bookstore with the lowest book quantity. We have to compare three book quantities of stores in the BookstoreAResponse, BookstoreBResponse, and AnotherBookstoreResponse variables. To access the BookstoreAResponse quantity, we should use the following XPath expression:

$BookstoreAResponse.payload/ns1:StockQuantity

Similarly, we would access the BookstoreB and AnotherBookstore stock quantities.

To select the lowest quantity, we should do the following comparisons:

  • Compare the BookstoreA stock quantity to BookstoreB and AnotherBookstore. If the BookstoreA stock quantity is lower or equal in both cases, select BookstoreA.

  • Compare the BookstoreB stock quantity to BookstoreA and AnotherBookstore. If the BookstoreB stock...

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