io.grpc.Context.CancellableContext Java Examples

The following examples show how to use io.grpc.Context.CancellableContext. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example #1
Source File: CascadingTest.java    From grpc-nebula-java with Apache License 2.0 7 votes vote down vote up 
/**
 * Test {@link Context} cancellation propagates from the first node in the call chain all the way
 * to the last.
 */
@Test
public void testCascadingCancellationViaOuterContextCancellation() throws Exception {
  observedCancellations = new CountDownLatch(2);
  receivedCancellations = new CountDownLatch(3);
  Future<?> chainReady = startChainingServer(3);
  CancellableContext context = Context.current().withCancellation();
  Future<SimpleResponse> future;
  Context prevContext = context.attach();
  try {
    future = futureStub.unaryCall(SimpleRequest.getDefaultInstance());
  } finally {
    context.detach(prevContext);
  }
  chainReady.get(5, TimeUnit.SECONDS);

  context.cancel(null);
  try {
    future.get(5, TimeUnit.SECONDS);
    fail("Expected cancellation");
  } catch (ExecutionException ex) {
    Status status = Status.fromThrowable(ex);
    assertEquals(Status.Code.CANCELLED, status.getCode());

    // Should have observed 2 cancellations responses from downstream servers
    if (!observedCancellations.await(5, TimeUnit.SECONDS)) {
      fail("Expected number of cancellations not observed by clients");
    }
    if (!receivedCancellations.await(5, TimeUnit.SECONDS)) {
      fail("Expected number of cancellations to be received by servers not observed");
    }
  }
}
Example #2
Source File: CascadingTest.java    From grpc-java with Apache License 2.0 5 votes vote down vote up 
/**
 * Test {@link Context} cancellation propagates from the first node in the call chain all the way
 * to the last.
 */
@Test
public void testCascadingCancellationViaOuterContextCancellation() throws Exception {
  observedCancellations = new CountDownLatch(2);
  receivedCancellations = new CountDownLatch(3);
  Future<?> chainReady = startChainingServer(3);
  CancellableContext context = Context.current().withCancellation();
  Future<SimpleResponse> future;
  Context prevContext = context.attach();
  try {
    future = futureStub.unaryCall(SimpleRequest.getDefaultInstance());
  } finally {
    context.detach(prevContext);
  }
  chainReady.get(5, TimeUnit.SECONDS);

  context.cancel(null);
  try {
    future.get(5, TimeUnit.SECONDS);
    fail("Expected cancellation");
  } catch (ExecutionException ex) {
    Status status = Status.fromThrowable(ex);
    assertEquals(Status.Code.CANCELLED, status.getCode());

    // Should have observed 2 cancellations responses from downstream servers
    if (!observedCancellations.await(5, TimeUnit.SECONDS)) {
      fail("Expected number of cancellations not observed by clients");
    }
    if (!receivedCancellations.await(5, TimeUnit.SECONDS)) {
      fail("Expected number of cancellations to be received by servers not observed");
    }
  }
}
Example #3
Source File: HealthStatusManagerTest.java    From grpc-java with Apache License 2.0 5 votes vote down vote up 
@Test
public void watchRemovedWhenClientCloses() throws Exception {
  CancellableContext withCancellation = Context.current().withCancellation();
  Context prevCtx = withCancellation.attach();
  RespObserver respObs1 = new RespObserver();
  try {
    assertThat(service.numWatchersForTest(SERVICE1)).isEqualTo(0);
    stub.watch(HealthCheckRequest.newBuilder().setService(SERVICE1).build(), respObs1);
  } finally {
    withCancellation.detach(prevCtx);
  }
  RespObserver respObs1b = new RespObserver();
  stub.watch(HealthCheckRequest.newBuilder().setService(SERVICE1).build(), respObs1b);
  RespObserver respObs2 = new RespObserver();
  stub.watch(HealthCheckRequest.newBuilder().setService(SERVICE2).build(), respObs2);

  assertThat(respObs1.responses.poll()).isEqualTo(
      HealthCheckResponse.newBuilder().setStatus(ServingStatus.SERVICE_UNKNOWN).build());
  assertThat(respObs1b.responses.poll()).isEqualTo(
      HealthCheckResponse.newBuilder().setStatus(ServingStatus.SERVICE_UNKNOWN).build());
  assertThat(respObs2.responses.poll()).isEqualTo(
      HealthCheckResponse.newBuilder().setStatus(ServingStatus.SERVICE_UNKNOWN).build());
  assertThat(service.numWatchersForTest(SERVICE1)).isEqualTo(2);
  assertThat(service.numWatchersForTest(SERVICE2)).isEqualTo(1);
  assertThat(respObs1.responses).isEmpty();
  assertThat(respObs1b.responses).isEmpty();
  assertThat(respObs2.responses).isEmpty();

  // This will cancel the RPC with respObs1
  withCancellation.close();

  assertThat(respObs1.responses.poll()).isInstanceOf(Throwable.class);
  assertThat(service.numWatchersForTest(SERVICE1)).isEqualTo(1);
  assertThat(service.numWatchersForTest(SERVICE2)).isEqualTo(1);
  assertThat(respObs1.responses).isEmpty();
  assertThat(respObs1b.responses).isEmpty();
  assertThat(respObs2.responses).isEmpty();
}
Example #4
Source File: HealthStatusManagerTest.java    From grpc-nebula-java with Apache License 2.0 3 votes vote down vote up 
@Test
public void watchRemovedWhenClientCloses() throws Exception {
  CancellableContext withCancellation = Context.current().withCancellation();
  Context prevCtx = withCancellation.attach();
  RespObserver respObs1 = new RespObserver();
  try {
    assertThat(service.numWatchersForTest(SERVICE1)).isEqualTo(0);
    stub.watch(HealthCheckRequest.newBuilder().setService(SERVICE1).build(), respObs1);
  } finally {
    withCancellation.detach(prevCtx);
  }
  RespObserver respObs1b = new RespObserver();
  stub.watch(HealthCheckRequest.newBuilder().setService(SERVICE1).build(), respObs1b);
  RespObserver respObs2 = new RespObserver();
  stub.watch(HealthCheckRequest.newBuilder().setService(SERVICE2).build(), respObs2);

  assertThat(respObs1.responses.poll()).isEqualTo(
      HealthCheckResponse.newBuilder().setStatus(ServingStatus.SERVICE_UNKNOWN).build());
  assertThat(respObs1b.responses.poll()).isEqualTo(
      HealthCheckResponse.newBuilder().setStatus(ServingStatus.SERVICE_UNKNOWN).build());
  assertThat(respObs2.responses.poll()).isEqualTo(
      HealthCheckResponse.newBuilder().setStatus(ServingStatus.SERVICE_UNKNOWN).build());
  assertThat(service.numWatchersForTest(SERVICE1)).isEqualTo(2);
  assertThat(service.numWatchersForTest(SERVICE2)).isEqualTo(1);
  assertThat(respObs1.responses).isEmpty();
  assertThat(respObs1b.responses).isEmpty();
  assertThat(respObs2.responses).isEmpty();

  // This will cancel the RPC with respObs1
  withCancellation.close();

  assertThat(respObs1.responses.poll()).isInstanceOf(Throwable.class);
  assertThat(service.numWatchersForTest(SERVICE1)).isEqualTo(1);
  assertThat(service.numWatchersForTest(SERVICE2)).isEqualTo(1);
  assertThat(respObs1.responses).isEmpty();
  assertThat(respObs1b.responses).isEmpty();
  assertThat(respObs2.responses).isEmpty();
}