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Oracle BPM Suite 11g: Advanced BPMN Topics
Oracle BPM Suite 11g: Advanced BPMN Topics

Oracle BPM Suite 11g: Advanced BPMN Topics: This tutorial reaches the parts that standard manuals don't, taking you deep into advanced BPMN topics for Oracle BPM Suite. With a practical approach and logical explanations, it will make you a maestro of BPMN.

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Oracle BPM Suite 11g: Advanced BPMN Topics

Chapter 2. Inter-process Communication in Practice

In the previous chapter, we learned about the various approaches to inter-process communication including send and receive tasks, and throw and catch events. We also discussed important concepts like conversations and correlation.

In this chapter, we will put this theory into practice by building a number of examples to consolidate our knowledge. When you have finished each practical exercise, we encourage you to experiment further—make some changes and see what happens.

Communicating between processes using messages and correlation


In this practice activity, we will build two processes and call one from the other using correlation . The example that we will use is illustrated in the following diagram. We will create a calling process that will send a number to the called process . The called process will square the number (multiply it by itself) and return the result to the calling process.

We will run multiple instances of the calling process, which will start multiple instances of the called process—one each. We will observe that the correct result is returned to each instance of the calling process.

  1. Start by creating a new BPM Application in JDeveloper. Name both the application and the project as Practice1.

  2. Choose the option to create an empty composite

    Let's define the data structures that we will use in this project. For this practice activity, we will create a business object called Work that will hold both the number and its square.

  3. Open BPM Process...

Communication between processes inside a loop


In this practice activity, we will extend the previous activity to include correlation when we call the Called process multiple times inside a loop. This will allow us to explore a slightly different area of correlation—scoped conversation s and correlation when the process is participating in multiple conversations. In this activity, our Calling process starts a number of sub-processes . Each of these in turn starts an instance of the called process, as illustrated in the following diagram:

Note

You need to complete the first practice activity before starting this one. This activity will extend the project we created previously.

Let's start by creating some additional data types we will need now:

  1. Create a second Business Object called WorkArray.

  2. Add a single attribute named work of type <Array> of <Component> Work. We will use this to hold our list of input data.

  3. Create another process called CallerWithMultiInstance, again choosing the...

Communicating between processes using signals


In this practice activity, we will explore how to use signals to create publish/subscribe style communication between process instances, as illustrated in the following diagram. You may recall that when using signals, the sending process does not know which (if any) other processes will receive the signal.

  1. Create a new BPM Application in JDeveloper. Name both the application and the project as Practice3. Choose the option to create an emty composite.

    Let's start by defining an event. First, we will need a data type definition for the event. We will place this in an XSD file:

  2. Create a new XSD file as myEvent.xsd. You may need to change to the All Technologies tab in New Gallery and choose XML on the left-hand side and XML Schema on the right-hand side of the screen.

  3. Right-click on exampleElement and add sequence inside it. Then, right-click on sequence and add an element inside that.

  4. Right-click on element and set its type to xsd:string. Your XSD should...

Using reusable sub-processes


In this practice activity, we want to explore how to use reusable sub-processes. You may recall from Chapter 1, Inter-process Communication, that a reusable sub-process follows the pattern of starting with a Start node with type None and ending with an End node with type None. They are called from a parent process with the Call activity.

The Called process that we created in the first two practice activities actually follows this pattern; however, we did not use a Call activity to invoke it in those practice activities.

You may also recall from Chapter 1, Inter-process Communication, that a reusable sub-process does not have access to its parent's variables unless they are passed in by the parent as arguments . In a reusable sub-process, you define the input and output arguments for the process at the process level, not on the Start and End nodes.

The Receive and Send tasks in the Called process we saw earlier are not the mechanism used for passing data in and...

Summary


In this chapter, we have practiced the skills learned in Chapter 1, Inter-process Communication. Specifically, we have looked at how to use correlation with the default conversation to communicate between instances of processes. We have seen that each of the instances of the calling process started a conversation with an instance of the called process, and each reply was sent back to the correct caller.

We explored the use of a scoped conversation and how correlation works with an advanced conversation (not the default conversation). We saw how to define the scoped conversation inside an embedded sub-process.

We also saw how to create and use a reusable sub-process and reviewed some important characteristics and limitations of reusable sub-processes.

The embedded sub-process is a very useful construct for dealing with collections of data. In the next chapter, we will move on to explore how to work with arrays and collections of data in more detail.

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Key benefits

  • Cover some of the most commonly misunderstood areas of BPMN
  • Gain the knowledge to write professional BPMN processes
  • A practical and concise tutorial packed with advanced topics which until now had received little or no documentation for BPM Suite developers and architects

Description

Oracle BPM Suite is a popular and highly capable business process management system with extensive integration capabilities. BPMN, one of the most widely used process modeling notations, includes advanced capabilities for inter-process communication, working of arrays of data, and handling exceptions. However, these very same areas are often poorly understood. This book gives you the knowledge to create professional process models using these advanced features of BPMN."Oracle BPM Suite 11g: Advanced BPMN Topics" is the only book available that provides coverage of advanced BPMN topics for Oracle BPM Suite, helping to fill in the gaps left by the product documentation, and giving you the information that you need to know to use BPMN to its full potential.This book covers the important theory behind inter-process communication, working with arrays and handling exceptions in BPMN, along with detailed, step-by-step practical exercises that demonstrate and consolidate this theoretical knowledge.Throughout the book we'll cover topics including different types of sub-processes, initializing and manipulating arrays, using the multi-instance embedded sub-process, fault propagation and more.With "Oracle BPM Suite 11g: Advanced BPMN Topics" in hand, you'll gain detailed and practical experience in using the advanced features of BPMN to create professional BPMN processes with Oracle BPM.

Who is this book for?

If you are a developer or architect working with Oracle BPM Suite 11g, this book is for you. Basic knowledge of BPM Suite and business process management in general is assumed.

What you will learn

  • Understand different ways to communicate between processes
  • Grasp which mechanisms are available for handling exceptions in BPM
  • Understand when to use different approaches to exception handling
  • Recognize how the Fault Management Framework can be used with BPM
  • Create, manipulate and iterate over arrays in BPMN
  • Capture exceptions in a BPMN process
  • Get to grips with using correlation, including inside loops
  • Understand how BPM exceptions affect the SCA composite
  • Ensure that communications are delivered to the correct instance of a process
  • Tackle each advanced concept through both theoretical and practical learning
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Publication date : Oct 01, 2012
Length: 114 pages
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Language : English
ISBN-13 : 9781849687560
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Length: 114 pages
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Table of Contents

5 Chapters
Inter-process Communication Chevron down icon Chevron up icon
Inter-process Communication in Practice Chevron down icon Chevron up icon
Working with Arrays Chevron down icon Chevron up icon
Handling Exceptions Chevron down icon Chevron up icon
Handling Exceptions in Practice Chevron down icon Chevron up icon

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This book is actually a good book for a beginner. It gives you a good understanding of some basic stuff that are 'must understand' when working with the BPM.It is very hard to find good bpm books but I will recommend this book together with the information that can be found on Oracles website.
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