Question

我正在尝试将队列连接到MessageChannel的前面，我需要以编程方式执行此操作，以便可以在运行时完成，以响应osgi:listener被触发。到目前为止我已经：

public void addService(MessageChannel mc, Map<String,Object> properties)
{
    //Create the queue and the QueueChannel
    BlockingQueue<Message<?>> q = new LinkedBlockingQueue<Message<?>>();
    QueueChannel qc = new QueueChannel(q);

    //Create the Bridge and set the output to the input parameter channel
    BridgeHandler b = new BridgeHandler();
    b.setOutputChannel(mc);

    //Presumably, I need something here to poll the QueueChannel
    //and drop it onto the bridge.  This is where I get lost

}

通过各种相关课程，我想出了：

    PollerMetadata pm = new PollerMetadata();
    pm.setTrigger(new IntervalTrigger(10));

    PollingConsumer pc = new PollingConsumer(qc, b);

但我无法将它们放在一起。我错过了什么？

Answer 1

所以，最终为我工作的解决方案是：

public void addEngineService(MessageChannel mc, Map<String,Object> properties)
{
    //Create the queue and the QueueChannel
    BlockingQueue<Message<?>> q = new LinkedBlockingQueue<Message<?>>();
    QueueChannel qc = new QueueChannel(q);

    //Create the Bridge and set the output to the input parameter channel 
    BridgeHandler b = new BridgeHandler();
    b.setOutputChannel(mc);

    //Setup a Polling Consumer to poll the queue channel and 
    //retrieve 1 thing at a time
    PollingConsumer pc = new PollingConsumer(qc, b);
    pc.setMaxMessagesPerPoll(1);

    //Now use an interval trigger to poll every 10 ms and attach it
    IntervalTrigger trig = new IntervalTrigger(10, TimeUnit.MILLISECONDS);
    trig.setInitialDelay(0);
    trig.setFixedRate(true);
    pc.setTrigger(trig);

    //Now set a task scheduler and start it
    pc.setTaskScheduler(taskSched);
    pc.setAutoStartup(true);
    pc.start();
}

如果明确需要以上所有内容，我并不十分清楚，但是触发器或任务调度程序都不起作用，我似乎确实需要两者。我还应该注意，使用的taskSched是从spring通过

注入的默认taskScheduler依赖项

<property name="taskSched" ref="taskScheduler"/>

在Spring中以编程方式将QueueChannel桥接到MessageChannel

1 个答案: