为什么Netty不执行我的计划任务?

时间:2016-07-16 15:26:19

标签: java netty scheduler

使用Java 8和Netty 4.1.1.Final,我希望以下测试用例能够成功,但它会超时。什么是我不明白w.r.t. nettys事件循环和任务调度?

public class SchedulerTest {


CountDownLatch latch;

TimerHandler handler;

static class TimerHandler extends ChannelInboundHandlerAdapter {

    ChannelHandlerContext ctx;

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        super.channelActive(ctx);
        this.ctx = ctx;
    }

    private void timeout(final long ms) {
        ctx.executor().schedule(() -> {
            ctx.fireUserEventTriggered(ms);
        }, ms, TimeUnit.MILLISECONDS);
    }

}

static class TimeoutReactor extends ChannelInboundHandlerAdapter {
    CountDownLatch latch;

    public TimeoutReactor(CountDownLatch latch) {
        super();
        this.latch = latch;
    }

    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
        System.out.println("userEventTriggered");
        latch.countDown();
        super.userEventTriggered(ctx, evt);
    }

}

@Before
public void setUp() throws Exception {
    latch = new CountDownLatch(2);
    handler = new TimerHandler();
    TimeoutReactor reactor = new TimeoutReactor(latch);
    new EmbeddedChannel(handler, reactor);
}

@Test(timeout = 1000)
public void test() throws InterruptedException {

    handler.timeout(30);
    handler.timeout(20);
    latch.await();
}

}

1 个答案:

答案 0 :(得分:2)

因为EmbeddedChannel不是真实的"通道实现主要用于测试和嵌入式ChannelHandler。你需要调用" runPendingTasks()"在给定的时间范围之后运行它。如果您使用"真实"通道实现它可以在没有任何额外方法调用的情况下工作。