wfp04exclusivechoicetest.java

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 * Lesser General Public License for more details.
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package org.jbpm.jpdl.patterns;

import junit.framework.TestCase;

import org.jbpm.context.def.ContextDefinition;
import org.jbpm.context.exe.ContextInstance;
import org.jbpm.graph.def.ProcessDefinition;
import org.jbpm.graph.exe.ProcessInstance;
import org.jbpm.graph.exe.Token;

/**
 * http://is.tm.tue.nl/research/patterns/download/swf/pat_4.swf
 * 
 * <p>we make a distinction in the api between process and client based 
 * decisions. the first tests show the situations as described in the 
 * pattern. after that a demonstration of client based decision is 
 * added.
 * </p>     
 * 
 * <p>process based 
 * decisions makes use of a decision node.  the node has a piece of 
 * programming logic associated that calculates the leaving transition
 * name.  the programming logic is executed within the calculation of 
 * the next state of the process instance.
 * </p>
 * 
 * <p>client based decisions allow clients to select on of the multiple 
 * transitions that leave the current state.
 * </p>  
 */
public class Wfp04ExclusiveChoiceTest extends TestCase {
  
  static ProcessDefinition exclusiveChoiceProcessDefinition = ProcessDefinition.parseXmlString(
      "<process-definition>" +
      "  <start-state name='start'>" +
      "    <transition to='a' />" +
      "  </start-state>" +
      "  <state name='a'>" +
      "    <transition to='xor' />" +
      "  </state>" +
      "  <decision name='xor'>" +
      "    <transition name='forget about it' to='d'/>" +
      "    <transition name='urgent' to='b'>" +
      "      <condition>#{scenario==1}</condition>" +
      "    </transition>" +
      "    <transition name='dont care' to='c'>" +
      "      <condition>#{scenario==2}</condition>" +
      "    </transition>" +
      "  </decision>" +
      "  <state name='b' />" +
      "  <state name='c' />" +
      "  <state name='d' />" +
      "</process-definition>" );
  static {
    exclusiveChoiceProcessDefinition.addDefinition( new ContextDefinition() );
  }

  /**
   * situation 1
   */
  public void testExclusiveChoiceSituation1() {
    ProcessDefinition pd = exclusiveChoiceProcessDefinition;

    ProcessInstance pi = new ProcessInstance( pd );
    ContextInstance ci = (ContextInstance) pi.getInstance( ContextInstance.class );
    pi.signal();
    Token root = pi.getRootToken();

    assertSame( pd.getNode("a"), root.getNode() );
    
    ci.setVariable( "scenario", new Integer(1) );
    root.signal();
    
    assertSame( pd.getNode("b"), root.getNode() );
  }

  /**
   * situation 2
   */
  public void testExclusiveChoiceSituation2() {
    ProcessDefinition pd = exclusiveChoiceProcessDefinition;

    ProcessInstance pi = new ProcessInstance( pd );
    ContextInstance ci = (ContextInstance) pi.getInstance( ContextInstance.class );
    pi.signal();
    Token root = pi.getRootToken();

    assertSame( pd.getNode("a"), root.getNode() );
    
    ci.setVariable( "scenario", new Integer(2) );
    root.signal();
    
    assertSame( pd.getNode("c"), root.getNode() );
  }

}