jbpm 与 工作流模式 基本控制模式(三)

好像源代码功能有点问题.

/*
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package org.jbpm.jpdl.patterns;

import junit.framework.*;

import org.jbpm.graph.def.*;
import org.jbpm.graph.exe.*;

/**
 * http://is.tm.tue.nl/research/patterns/download/swf/pat_5.swf
 *
 * <p>in jbpm every node has an implicit merge in front of it.
 * so it's not necessary to use the merge node.  in fact, i can
 * not think of a situation where implicit merge nodeMap are not
 * sufficient.  for the sake of workflow patterns, we leave if in.
 * jbpm supports merging of both alternative paths of execution
 * and concurrent paths of execution.
 * </p>
 *
 * <p>first the merge node is demonstrated exactly as in the pattern.
 * then the implicit variant is demonstrated, then the merging of
 * concurrent paths is demonstrated.
 * </p>
 */
public class Wfp05SimpleMergeTest extends TestCase {

  private static ProcessDefinition simpleMergeProcessDefinition = createSimpleMergeProcessDefinition();
 
  public static ProcessDefinition createSimpleMergeProcessDefinition() {
    ProcessDefinition pd = new ProcessDefinition(
      new String[]{"start-state start",
                   "state a",
                   "state b",
                   "merge xor",
                   "state c"},
      new String[]{"start --to a--> a",
                   "start --to b--> b",
                   "a --> xor",
                   "b --> xor",
                   "xor --> c"});
    return pd;
  }

  public void testSimpleMergeScenario1() {
    ProcessDefinition pd = simpleMergeProcessDefinition;
    ProcessInstance pi = new ProcessInstance( pd );
    pi.signal("to a");
    Token root = pi.getRootToken();
    assertSame( pd.getNode("a"), root.getNode() );
    root.signal();
    assertSame( pd.getNode("c"), root.getNode() );
  }

  public void testSimpleMergeScenario2() {
    ProcessDefinition pd = simpleMergeProcessDefinition;
    ProcessInstance pi = new ProcessInstance( pd );
    pi.signal("to b");
    Token root = pi.getRootToken();
    assertSame( pd.getNode("b"), root.getNode() );
    root.signal();
    assertSame( pd.getNode("c"), root.getNode() );
  }
 
  private static ProcessDefinition implicitMergeProcessDefinition = createImplicitMergeProcessDefinition();
 
  public static ProcessDefinition createImplicitMergeProcessDefinition() {
    ProcessDefinition pd = new ProcessDefinition(
      new String[]{"start-state start",
                   "state a",
                   "state b",
                   "state c"},
      new String[]{"start --to a--> a",
                   "start --to b--> b",
                   "a --> c",
                   "b --> c"});
    return pd;
  }

  public void testImplicitMergeScenario1() {
    ProcessDefinition pd = implicitMergeProcessDefinition;
    ProcessInstance pi = new ProcessInstance( implicitMergeProcessDefinition );
    pi.signal("to a");
    Token root = pi.getRootToken();
    assertSame( pd.getNode("a"), root.getNode() );
    root.signal();
    assertSame( pd.getNode("c"), root.getNode() );
  }
 
  public void testImplicitMergeScenario2() {
    ProcessDefinition pd = implicitMergeProcessDefinition;
    ProcessInstance pi = new ProcessInstance( implicitMergeProcessDefinition );
    pi.signal("to b");
    Token root = pi.getRootToken();
    assertSame( pd.getNode("b"), root.getNode() );
    root.signal();
    assertSame( pd.getNode("c"), root.getNode() );
  }
 
}

createSimpleMergeProcessDefinition()

创建如下流程定义文件

xml 代码

<process-definition name="process">
    <start-state name='start'>
        <transition name='to a' to='a' />
        <transition name='to b' to='b' />
    </start-state>
    <state name='a'>
        <transition to='xor' />
    </state>
    <state name='b'>
        <transition to='xor' />
    </state>
    <state name='xor'>
        <transition to='c' />
    </state>
    <state name='c' />
</process-definition>

testSimpleMergeScenario1()

节点执行顺序
   
    start --> a --> xor --> c

testSimpleMergeScenario2()
 
    start --> b --> xor --> c

createImplicitMergeProcessDefinition()

创建如下流程定义文件

xml 代码

<process-definition name="process">
    <start-state name='start'>
        <transition name='to a' to='a' />
        <transition name='to b' to='b' />
    </start-state>
    <state name='a'>
        <transition to='c' />
    </state>
    <state name='b'>
        <transition to='c' />
    </state>
    <state name='c' />
</process-definition>

testImplicitMergeScenario1()
节点执行顺序

  start --> a --> c

testImplicitMergeScenario2()
节点执行顺序

  start --> b --> c



以上是对基本控制流程的一些说明, 本人水平有限, 难免有不当之处. 欢迎批评指正.

评论

1 楼 jeffen2006 2006-11-30  

好像源代码功能有点问题，是因为merge持久化错误的问题