开源工作流Fireflow源码分析之ActivityInstance fired

ActivityInstance.java

 /* Activity触发事件

     * @see org.fireflow.kernel.INodeInstance#fire(org.fireflow.kernel.IToken)

     */

    public void fire(IToken tk) throws KernelException {

    	//打印权重.

        log.debug("The weight of the Entering TransitionInstance is " + tk.getValue());

        IToken token = tk;

        //设置当前的节点实例ID

        token.setNodeId(this.getActivity().getId());

        //触发Activity Entered事件

        NodeInstanceEvent event1 = new NodeInstanceEvent(this);

        event1.setToken(tk);

        event1.setEventType(NodeInstanceEvent.NODEINSTANCE_TOKEN_ENTERED);

        fireNodeEvent(event1);

        //如果token是活动的

        //注:关于token的状态(alive or dead),是由TranstionInstance决定的,详见<<开源工作流Fireflow源码分析之运行流程二>>

        if (token.isAlive()) {

        	//触发Activity Fired事件

            NodeInstanceEvent event = new NodeInstanceEvent(this);

            event.setToken(token);

            event.setEventType(NodeInstanceEvent.NODEINSTANCE_FIRED);

            //详见下面介绍

            fireNodeEvent(event);

        } else {

        	//如果token是dead状态，那么就直接结束当前节点。

        	//详见<<开源工作流Fireflow源码分析之ActivityInstance completed一.doc>>

            this.complete(token, null);

        }

}

AbstractNodeInstance.java

/**

	 * 触发ActivityInstance各种事件，实现类中根据事件的不同而进行触发

	 * @param event

	 * @throws KernelException

	 */

	public void fireNodeEvent(NodeInstanceEvent event) throws KernelException{

		//遍历当前节点的事件监听器，依次进行触发

		for (int i=0;i<this.eventListeners.size();i++){

			INodeInstanceEventListener listener = this.eventListeners.get(i);

			listener.onNodeInstanceEventFired(event);

		}

	}

ActivityInstance默认的事件监听器为ActivityInstanceExtension

 /* ActivityInstance事件触发

     * @see org.fireflow.kernel.event.INodeInstanceEventListener#onNodeInstanceEventFired(org.fireflow.kernel.event.NodeInstanceEvent)

     */

    public void onNodeInstanceEventFired(NodeInstanceEvent e)

            throws KernelException {

    	//如果事件为fired 

        if (e.getEventType() == NodeInstanceEvent.NODEINSTANCE_FIRED) {

            //取到spring中定义的持久化类

            IPersistenceService persistenceService = rtCtx.getPersistenceService();

            //保存token，并创建taskinstance

            persistenceService.saveOrUpdateToken(e.getToken());

            //取到task管理器，创建activity Task.

          //详见<<开源工作流Fireflow源码分析之ActivityInstance Created Task>>         

   rtCtx.getTaskInstanceManager().createTaskInstances(e.getToken(), (IActivityInstance) e.getSource());

        } else if (e.getEventType() == NodeInstanceEvent.NODEINSTANCE_COMPLETED) {

          	//如果事件为completed,作者未处理

        }

    }