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jBPM6 Developer Guide
jBPM6 Developer Guide

jBPM6 Developer Guide: Learn about the components, tooling, and integration points that are part of the JBoss Business Process Management (BPM) framework , Third Edition

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jBPM6 Developer Guide

Chapter 2. BPM Systems' Structure

Business Process Management (BPM) systems are pieces of software created with the sole purpose of guiding your processes through the BPM cycle. They were originally monolithic systems in charge of every aspect of a process, where they had to be heavily migrated from visual representations to executable definitions. They've come a long way from there, but we usually relate them to the same old picture in our heads when a system that runs all your business processes is mentioned. Nowadays, nothing is further from the truth.

Modern BPM Systems are not monolithic environments; they're coordination agents. If a task is finished, they will know what to do next. If a decision needs to be made regarding the next step, they manage it. If a group of tasks can be concurrent, they turn them into parallel tasks. If a process's execution is efficient, they will perform the processing 0.1 percent of the time in the process engine and 99.9...

Components of a BPMS

All big systems become manageable when we divide their complexities into smaller pieces, which makes them easier to understand and implement. BPM systems apply this by dividing each function in a different module and interconnecting them within a special structure that (in the case of jBPM6) looks something like the following figure:

Components of a BPMS

BPMS' internal structure

Each component in the preceding figure resolves one particular function inside the BPMS architecture, and we'll see a detailed explanation on each one of them.

The execution node

The execution node, as seen from a black box perspective, is the component that receives the process definitions (a description of each step that must be followed; from here on, we'll just refer to them as processes). Then, it executes all the necessary steps in the established way, keeping track of each step, variable, and decision that has to be taken in each process's execution (we'll start calling these process...

Node instance structures

jBPM6 uses a node-instance-based approach to determine what steps are being executed by the process instance. This means, for every active step in the process, a node instance object exists in the process instance. When the step is completed, the node instance is removed. This allows us to have a list of active steps in the process instance that are accessible by jBPM6 from the getNodeInstances method available from the NodeInstanceContainer interface. The following code shows a simplification of the methods of most of the node instance implementations:

public interface NodeInstance {
  public ProcessInstance getProcessInstance() { ... }
  public long getId() { ... }
  public long getNodeId() { ... }
  public void trigger(NodeInstance from, String type) { ... }
  public void cancel() { ... }
}

Here, you can see that node instance objects have methods to trigger the execution of a particular step or to cancel it from the outside. It also has an identifier for itself...

External interactions

As said before, good process engines are not meant to be monolithic software that manage everything inside; instead, they are coordination frameworks for people and other systems. One key component to achieve such a behavior is to provide a connector strategy to configure and/or code external interactions between the process and other systems.

From the runtime point of view, each one of these external interaction instances are called Work items. Work items are a representation of a specific step in a process execution. They will store the input and output information for each interaction and its state (pending, active, completed, or aborted).

However, information about the actual occurrence of the external interaction invocation is not enough. We need a way to create our own external interaction code to determine what to do for each particular case. To handle these interactions, you need to implement the WorkItemHandler interface, which is used to manage external interactions...

Predictive analytics and decision management

Predictive analytics is a highly recurring concept that surrounds decision management systems. It is based on analyzing the information exposed by knowledge-based services and finding missing cases, detecting projections in the values of variables, and expanding the universe of information by cross-referencing other sources of information.

In order to analyze this information to obtain such insights, events from different sources (including process executions from BPM systems), that is, from real-time production environments, are fed into a simulation environment. Here, queries are raised and data analysis conducted to test different scenarios to see which ones have a better coverage of all the cases.

The information obtained is later used to feed new knowledge definitions to production environments. This cycle is known as the decision analysis cycle.

Predictive analytics and decision management

Decision analysis cycle, encompassing both runtime and analysis

BPM systems assist in decision...

Summary

In this chapter, we have covered all the components that create a BPM system and also how the said components are implemented for jBPM6. We've started learning APIs that use the said components. In further chapters, we will go deeper into the configuration and coding details to fully cover the components discussed in this chapter.

There are a lot of architectures and design components that can be mixed with BPM systems. We will continue by solving problems with the described tools and concepts to learn where to apply them and mention good connection points to other architectures or concepts. Learning more about technologies that BPM systems relate to will help you enrich your design and implementations, by providing you with a whole set of middleware solutions.

To download the source code used in this and the following chapters, go to http://github.com/marianbuenosayres/jBPM6-Developer-Guide. You will find a folder for each chapter that contains the source code that we see in...

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Description

If you are a Java developer or architect who needs to have a better understanding of how Business Process Management frameworks behave in real-life implementations, this book is for you. This book assumes that you know the Java language well and are familiar with some widely used frameworks such as Hibernate. You should also know the basics of relational databases and Maven-based applications.
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Publication date : Aug 18, 2014
Length: 310 pages
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Language : English
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Table of Contents

12 Chapters
1. Why Do We Need Business Process Management? Chevron down icon Chevron up icon
2. BPM Systems' Structure Chevron down icon Chevron up icon
3. Using BPMN 2.0 to Model Business Scenarios Chevron down icon Chevron up icon
4. Understanding the KIE Workbench Chevron down icon Chevron up icon
5. Creating a Process Project in the KIE Workbench Chevron down icon Chevron up icon
6. Human Interactions Chevron down icon Chevron up icon
7. Defining Your Environment with the Runtime Manager Chevron down icon Chevron up icon
8. Implementing Persistence and Transactions Chevron down icon Chevron up icon
9. Integration with Other Knowledge Definitions Chevron down icon Chevron up icon
10. Integrating KIE Workbench with External Systems Chevron down icon Chevron up icon
A. The UberFire Framework Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
(4 Ratings)
5 star 25%
4 star 0%
3 star 0%
2 star 0%
1 star 75%
Amazon Kunde Dec 29, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Es gibt sehr viele Quellen zu jBPM6; allein schon die offizielle Dokumentation von RedHat ist ausführlich und gut für eine Community Edition. Aber: Kaum irgendwo kann man finden, WIE genau man das dokumentierte und beschriebene einsetzt. Stackoverflow ist nicht geeignet zum systematischen Erlernen, Tutorials kommen über "Hallo Welt!" selten hinaus und Video-Tutorials sind nicht immer Effizient.Das Buch kann und sollte man sequentiell durcharbeiten mit einer geöffneten Eclipse nebendran. Die Beispiele im Buch beziehen sich auf die inzwischen veraltete Version 6.1, können aber dank Maven-Repositories alle noch immer direkt in der IDE nachvollzogen werden.Nach vielem vergeblichen Suchen im Internet halte ich dieses Buch für geeignet, einem Entwickler gut und effizient beizubringen, wie genau man mit jBPM programmiertechnisch umgeht.
Amazon Verified review Amazon
MARCUS ANTONIO MARTINHO E SILVA Apr 21, 2015
Full star icon Empty star icon Empty star icon Empty star icon Empty star icon 1
Não foi bem o que eu esperava. O autor se deteve a muitos detalhes, sem dar continuidade ao projeto de tutorial. Dessa forma, os conceitos ficaram "soltos", o que atrapalha a vida prática do desenvolvedor, visto que não consegue linkar o problema com as soluções propostas pelo mecanismo.
Amazon Verified review Amazon
Grant Olson Mar 10, 2015
Full star icon Empty star icon Empty star icon Empty star icon Empty star icon 1
Added no value for me over the free, online jBPM User Guide.
Amazon Verified review Amazon
StefanS Dec 06, 2019
Full star icon Empty star icon Empty star icon Empty star icon Empty star icon 1
wir verwendeten jBPMN, um Workflows für ein Data Warehouse zu entwickeln. Das Buch war überhaupt keine Hilfe
Amazon Verified review Amazon
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