JBPM流程通过Aciton动态创建TaskInstance来实现“会签”

1. 创建processDefinition.xml流程定义文件，如下：

<?xml version="1.0" encoding="UTF-8"?>
<process-definition xmlns="urn:jbpm.org:jpdl-3.1" name="webPay">
    <swimlane name="PooledActors">
        <assignment class="com.sky.plugin.jbpm.ActorHandel"></assignment>
    </swimlane>
    <start-state name="网上支付审批流程">
        <transition name="开始" to="财务人员录入"></transition>
    </start-state>
    <task-node name="财务人员录入">
        <task name="财务人员录入申报数据" swimlane="PooledActors"></task>
        <transition name="主管会计复核" to="主管会计复核"></transition>
    </task-node>
    <task-node name="主管会计复核" signal="last-wait" create-tasks="false">
        <task name="主管会计复核" swimlane="PooledActors"></task>
        <event type="node-enter">
            <action name="createInstance"
        class="com.sky.plugin.jbpm.CreateTaskInstance">
            </action>
        </event>
        <transition name="复核通过" to="领导审批"></transition>
        <transition name="复核不通过" to="异常结束"></transition>
    </task-node>
    <task-node name="领导审批">
        <task name="领导审批" swimlane="PooledActors"></task>
        <transition name="同意" to="结束"></transition>
        <transition name="不同意" to="异常结束"></transition>
    </task-node>
    <end-state name="结束"></end-state>
    <end-state name="异常结束"></end-state>
</process-definition>

<?xml version="1.0" encoding="UTF-8"?>
<process-definition xmlns="urn:jbpm.org:jpdl-3.1" name="webPay">
	<swimlane name="PooledActors">
		<assignment class="com.sky.plugin.jbpm.ActorHandel"></assignment>
	</swimlane>
	<start-state name="网上支付审批流程">
		<transition name="开始" to="财务人员录入"></transition>
	</start-state>
	<task-node name="财务人员录入">
		<task name="财务人员录入申报数据" swimlane="PooledActors"></task>
		<transition name="主管会计复核" to="主管会计复核"></transition>
	</task-node>
	<task-node name="主管会计复核" signal="last-wait" create-tasks="false">
		<task name="主管会计复核" swimlane="PooledActors"></task>
		<event type="node-enter">
			<action name="createInstance"
		class="com.sky.plugin.jbpm.CreateTaskInstance">
			</action>
		</event>
		<transition name="复核通过" to="领导审批"></transition>
		<transition name="复核不通过" to="异常结束"></transition>
	</task-node>
	<task-node name="领导审批">
		<task name="领导审批" swimlane="PooledActors"></task>
		<transition name="同意" to="结束"></transition>
		<transition name="不同意" to="异常结束"></transition>
	</task-node>
	<end-state name="结束"></end-state>
	<end-state name="异常结束"></end-state>
</process-definition>

task-node"主管会计复核"则是我们需要进行会签的节点。在这个节点我们设置了几个重要的属性：

1) signal="last-wait",这个属性决定了该节点将在完成该节点内的所有Task的TaskInstance以后才会进入下一个节点。)

2) create-tasks="false",这个属性决定了在进入该节点的时候，不会自动为该节点的任何Task创建任何的TaskInstance。因为我们需要根据会签的人员来自己创建TaskInstance。

3) action,action的设定是为了，在Action中根据实际的情况来创建TaskInstance

2. 编写Action代码

import org.jbpm.graph.def.ActionHandler;
import org.jbpm.graph.exe.ExecutionContext;
import org.jbpm.graph.exe.Token;
import org.jbpm.graph.node.TaskNode;
import org.jbpm.taskmgmt.def.Task;
import org.jbpm.taskmgmt.exe.TaskMgmtInstance;

public class CreateTaskInstance implements ActionHandler {

    private static final long serialVersionUID = 1L;

    public void execute(ExecutionContext executionContext) throws Exception {
        Token token = executionContext.getToken();
        TaskMgmtInstance tmi = executionContext.getTaskMgmtInstance();

        TaskNode taskNode = (TaskNode) executionContext.getNode();
        Task task= taskNode.getTask("主管会计复核");
        tmi.createTaskInstance(task, token)
                      .setPooledActors(new String[]{"1000"});
        tmi.createTaskInstance(task, token)
                      .setPooledActors(new String[]{"1001"});

    }

}

import org.jbpm.graph.def.ActionHandler;
import org.jbpm.graph.exe.ExecutionContext;
import org.jbpm.graph.exe.Token;
import org.jbpm.graph.node.TaskNode;
import org.jbpm.taskmgmt.def.Task;
import org.jbpm.taskmgmt.exe.TaskMgmtInstance;

public class CreateTaskInstance implements ActionHandler {

	private static final long serialVersionUID = 1L;

	public void execute(ExecutionContext executionContext) throws Exception {
		Token token = executionContext.getToken();
		TaskMgmtInstance tmi = executionContext.getTaskMgmtInstance();

		TaskNode taskNode = (TaskNode) executionContext.getNode();
		Task task= taskNode.getTask("主管会计复核");
		tmi.createTaskInstance(task, token)
                      .setPooledActors(new String[]{"1000"});
		tmi.createTaskInstance(task, token)
                      .setPooledActors(new String[]{"1001"});

	}

}

当然，在实际情况中.setPooledActors(new String[]{"100"})中设置的actor应该是动态指定的，这里为了简单方便就直接写入的固定值。

3.部署运行，OK！

注意：如果在给TaskInstance指定Actor的时候是使用.setActor()方法的话，那么在获取用户任务列表的时候用. findTaskInstances();如果是用.setPooledActors()，则需要使用.findPolledTaskInstance ()方法。