JBPM4.4(2)-state结点和decision结点
做一个带有分支的流向流程
在执行seperate状态的时候分成了200和400两种情况
描述文件的内容如下：
View Code
<?xml version="1.0" encoding="UTF-8"?>
<process name="fork" xmlns="http://jbpm.org/4.4/jpdl">
<start g="237,28,48,48" name="start1">
<transition name="to separate" to="separate" g="-71,-17"/>
</start>
<state g="210,153,92,52" name="separate">
<transition name="to 200" to="200" g="-41,-17"/>
<transition name="to 400" to="400" g="-41,-17"/>
</state>
<state g="145,256,92,52" name="200">
<transition name="to end1" to="end1" g="-47,-17"/>
</state>
<state g="306,255,92,52" name="400">
<transition name="to end1" to="end1" g="-47,-17"/>
</state>
<end g="245,375,48,48" name="end1"/>
</process>
测试代码如下：
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public class TestSperator extends JbpmTestCase {
String deploymentId;
protected void setUp() throws Exception {
super.setUp();
deploymentId = repositoryService.createDeployment()
.addResourceFromClasspath("com/jbpm/fork/fork.jpdl.xml")
.deploy();
}
protected void tearDown() throws Exception {
repositoryService.deleteDeploymentCascade(deploymentId);
super.tearDown();
}
public void testSeparate() {
ProcessInstance processInstance = executionService
.startProcessInstanceByKey("fork");
System.out.println("流程实例Id:" + processInstance.getId());
System.out.println("流程定义Id:" + processInstance.getProcessDefinitionId());
ProcessInstance instance = executionService.signalExecutionById(processInstance.getId());
// 判断当前是否位于state节点
System.out.println("是否位于state节点:" + instance.isActive("separate"));
System.out.println("向下执行...");
ProcessInstance processInstance200=executionService.signalExecutionById(processInstance.getId(), "to 200");
System.out.println("当前流程是否位于200节点---->"+processInstance200.isActive("200"));
System.out.println("当前流程是否结束---->"+processInstance200.isEnded());
ProcessInstance endinstance=executionService.signalExecutionById(processInstance200.getId());
System.out.println("当前流程是否结束---->"+endinstance.isEnded());
}
}
执行流程的结果如下：
使流程向下执行
executionService.signalExecutionById();
该方法有多个重载:
|
ProcessInstance signalExecutionById(String executionId); //若在流程定义某一个节点没有分支时(只有一个transition时)，调用此方法，可将流程继续向下执行 executionId为流程实例Id ProcessInstance signalExecutionById(String executionId, String signalName); //若在流程定义某一个节点有多个分支时(有多个transition时)，调用此方法，可将流程沿着transition所指的方向向下执行 executionId为流程实例Id, signalName为流程定义中transition节点的name属性的值 ProcessInstance signalExecutionById(String executionId, String signalName, Map<String, ?> parameters); 用于将流程沿着signalName方向(transition的name属性所指的方向)向下继续执行,在执行的过程中顺便传递参数parameters ProcessInstance signalExecutionById(String executionId, Map<String, ?> parameters); 用于将流程向下继续执行,在执行的过程中顺便传递参数parameters |
注:当一个节点有多个分支时,若要通过signalExecutionById()方法将流程向下执行必须明确指出signalName即(transition的name属性所指的方向),否则流程不会向下执行，仍会停留在当前节点。因为jbpm不确定流程该流向那个方向。
接下来是一个decision的例子，这个是一个分支判断的节点，相当于我们程序中的switch case
下面画一个选择向左还是向右的例子
定义文件如下：
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<?xml version="1.0" encoding="UTF-8"?>
<process name="decision" xmlns="http://jbpm.org/4.4/jpdl">
<start g="246,30,48,48" name="start1">
<transition name="to wait" to="wait" g="-47,-17"/>
</start>
<state g="231,112,92,52" name="wait">
<transition name="to exclusive1" to="exclusive1" g="-83,-17"/>
</state>
<decision g="252,204,48,48" name="exclusive1">
<transition name="to left" to="left" g="-47,-17">
<condition expr="${coder=='left'}"></condition>
</transition>
<transition name="to right" to="right" g="-53,-17">
<condition expr="${coder=='right'}"></condition>
</transition>
</decision>
<state g="175,295,92,52" name="left">
<transition name="to end1" to="end1" g="-47,-17"/>
</state>
<state g="325,292,92,52" name="right">
<transition name="to end1" to="end1" g="-47,-17"/>
</state>
<end g="268,370,48,48" name="end1"/>
</process>
其中有几种方式可以处理流程的走向
第一种，内置条件即在流程定义中设置每一个transition的子节点condition,并为每一个condition填充expr属性
形如:
<condition expr="${coder=='left'}"></condition>
对应的测试流程如下，需要增加
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Map<String, String> map=new HashMap<String, String>();
//coder为流程定义中表达式的名称
map.put("coder", "left");
ProcessInstance processInstance = executionService.startProcessInstanceByKey("decision",map);
如果map中order的值指定的有问题那么就会抛出异常
测试程序如下：
View Code
public class TestDecision extends JbpmTestCase {
String deploymentId;
protected void setUp() throws Exception {
super.setUp();
deploymentId = repositoryService.createDeployment()
.addResourceFromClasspath("com/jbpm/decision/decision.jpdl.xml")
.deploy();
}
protected void tearDown() throws Exception {
repositoryService.deleteDeploymentCascade(deploymentId);
super.tearDown();
}
public void testDescsion() {
Map<String, String> map=new HashMap<String, String>();
//coder为流程定义中表达式的名称
map.put("coder", "left");
ProcessInstance processInstance = executionService.startProcessInstanceByKey("decision",map);
System.out.println("流程实例Id:" + processInstance.getId());
System.out.println("流程定义Id:" + processInstance.getProcessDefinitionId());
System.out.println("是否位于state节点:" + processInstance.isActive("wait"));
ProcessInstance decisionInstance = executionService.signalExecutionById(processInstance.getId());
// 判断当前是否位于wait节点
System.out.println("是否位于wait节点:" + decisionInstance.isActive("wait"));
System.out.println("因为已经有值所以自动向下执行...");
System.out.println("是否位于left节点:" + decisionInstance.isActive("left"));
//向下执行
ProcessInstance endinstance=executionService.signalExecutionById(decisionInstance.getId());
System.out.println("当前流程是否结束---->"+endinstance.isEnded());
}
}
执行结果如图所示：
因为在开始的时候指定了流程处理的方向，所以流程向left方向自动执行。
第二种，更像switch case在decision节点上指定
<decision g="252,204,48,48" name="exclusive1" expr="${toWhere}">
修改代码为：
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Map<String, String> map=new HashMap<String, String>();
//coder为流程定义中表达式的名称
map.put("toWhere", "to left");
其它部分不变，可以看到结果和原来的相同。
第三种，配置handler子类
在流程定义中在decision节点内部配置<handler/>子节点,并设置该元素的class属性为你自己的类)该类实现了org.jbpm.api.jpdl.DecisionHandler.你需要重写
String decide(OpenExecution execution);方法即可,在该方法最终返回decision活动后的下一个transition的name属性的值。
修改配置文件
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<decision g="252,204,48,48" name="exclusive1">
<handler class="com.jbpm.decision.HandlerDecision"></handler>
<transition name="to left" to="left" g="-47,-17">
</transition>
<transition name="to right" to="right" g="-53,-17">
</transition>
</decision>
添加HandlerDecision并且实现DecisionHandler
代码如下：
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@SuppressWarnings("serial")
public class HandlerDecision implements DecisionHandler {
@Override
public String decide(OpenExecution execution) {
// TODO Auto-generated method stub
String toWhere = execution.getVariable("toWhere").toString();
String result = null;
if ("left".equals(toWhere)) {
result = "to left";
} else if ("right".equals(toWhere)) {
result = "to right";
}
return result;
}
}
测试代码只需将map中的值进行简单修改即可
Map<String, String> map=new HashMap<String, String>();
//coder为流程定义中表达式的名称
map.put("toWhere", "left");
