Vertx 单元测试阻塞主线程

Question

在尝试通过测试 class 使用事件总线测试 Vert.x Verticle 时，我得到了 "blocking errors"。在这里垂直并测试 classes:

EventBusReceiverVerticle:

public class EventBusReceiverVerticle extends AbstractVerticle {

    public EventBusReceiverVerticle(String name) {
        this.name = name;
    }

    public void start() {

              vertx.eventBus().consumer("geo-service", (Message<JsonObject> handler) -> {
            {
                try {
                    System.out.println("sleep 10 seconds");
                    Thread.sleep(10000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }           
            }
        });
    }
}

测试class:

@RunWith(VertxUnitRunner.class)
public class MyFirstVerticleTest {
    Vertx vertx;
    EventBus eb;
    private static final Logger logger = LoggerFactory.getLogger(MyFirstVerticleTest.class);


    @Before
    public void setUp(TestContext context) {
        logger.info("@Before");
        vertx = Vertx.vertx();
        eb = vertx.eventBus();

        Async async = context.async();
        vertx.deployVerticle(new EventBusReceiverVerticle("R1"), res -> {
            if (res.succeeded()) {
                async.complete();
            } else {
                context.fail();
            }
        });
    }

    @After
    public void tearDown(TestContext context) {
        logger.info("@After");
        Async async = context.async();
        vertx.close(event -> async.complete());
    }


    @Test
    public void testEventBusVerticle(TestContext context) {
        Async async = context.async();
        JsonObject msg = new JsonObject("{\"action\":\"pos\"}");
        eb.send("geo-service", msg, reply -> {
            if (reply.succeeded()) {
                async.complete();
            } else {
                context.fail();
            }
        });
        async.complete();
    }
}

控制台输出：

Sep 05, 2015 2:20:23 PM com.company.MyFirstVerticleTest
INFO: @Before
sleep 10 seconds
Sep 05, 2015 2:20:24 PM com.company.MyFirstVerticleTest
INFO: @After
Sep 05, 2015 2:20:27 PM io.vertx.core.impl.BlockedThreadChecker
WARNING: Thread Thread[vert.x-eventloop-thread-2,5,main] has been blocked for 2790 ms, time limit is 2000
Sep 05, 2015 2:20:28 PM io.vertx.core.impl.BlockedThreadChecker
WARNING: Thread Thread[vert.x-eventloop-thread-2,5,main] has been blocked for 3794 ms, time limit is 2000
Sep 05, 2015 2:20:29 PM io.vertx.core.impl.BlockedThreadChecker
WARNING: Thread Thread[vert.x-eventloop-thread-2,5,main] has been blocked for 4796 ms, time limit is 2000
Sep 05, 2015 2:20:30 PM io.vertx.core.impl.BlockedThreadChecker
WARNING: Thread Thread[vert.x-eventloop-thread-2,5,main] has been blocked for 5799 ms, time limit is 2000
io.vertx.core.VertxException: Thread blocked
    at java.lang.Thread.sleep(Native Method)
    at com.company.verticals.EventBusReceiverVerticle.lambda$start(EventBusReceiverVerticle.java:35)
    at com.company.verticals.EventBusReceiverVerticle$$Lambda/2029238960.handle(Unknown Source)
    at io.vertx.core.eventbus.impl.EventBusImpl$HandlerRegistration.handle(EventBusImpl.java:1108)
    at io.vertx.core.eventbus.impl.EventBusImpl.lambda$doReceive9(EventBusImpl.java:755)
    at io.vertx.core.eventbus.impl.EventBusImpl$$Lambda/1888442711.handle(Unknown Source)
    at io.vertx.core.impl.ContextImpl.lambda$wrapTask(ContextImpl.java:314)
    at io.vertx.core.impl.ContextImpl$$Lambda/911312317.run(Unknown Source)
    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:357)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:357)
    at io.netty.util.concurrent.SingleThreadEventExecutor.run(SingleThreadEventExecutor.java:111)
    at java.lang.Thread.run(Thread.java:745)

Answer 1

我必须通过设置将 Verticle 设置为 worker：

new DeploymentOptions().setWorker(true)

Answer 2

另一种选择是增加超时

VertxOptions options = new VertxOptions(); 
options.setMaxEventLoopExecuteTime(Long.MAX_VALUE);
vertx = Vertx.vertx(options);`

Answer 3

Vertx documentation 中的关键句子是

Don’t block me!

您收到了阻塞消息，因为您确实在 Verticle 中执行了阻塞代码。调用 Thread.sleep(10000) 会阻止您当前的 Verticle 10 秒。

将您的 Verticle 声明为 worker 是一种解决方法。查看 Vertx 文档 Executing blocking code。根据文档，您可以告诉 Vertx 执行 Thread.sleep(10000) 作为阻塞代码。

vertx.executeBlocking({ future ->
  // Call some blocking API that takes a significant amount of time to return
  Thread.sleep(10000)
  future.complete(result)
}, { res ->
  println("The result is: ${res.result()}")
})

也许您可以解释一下您的测试目的以及为什么使用 Thread.sleep(10000)？

Vertx 单元测试阻塞主线程

Vertx unit-test blocking the main thread

java

vert.x