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SpoolingCallableTest.java
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SpoolingCallableTest.java
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/*
* Copyright 2017 Google LLC
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google LLC nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.google.api.gax.rpc;
import static com.google.common.truth.Truth.assertThat;
import com.google.api.core.ApiFuture;
import com.google.api.gax.rpc.testing.MockStreamingApi.MockServerStreamingCall;
import com.google.api.gax.rpc.testing.MockStreamingApi.MockServerStreamingCallable;
import com.google.common.truth.Truth;
import java.util.List;
import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
@RunWith(JUnit4.class)
public class SpoolingCallableTest {
private MockServerStreamingCallable<String, String> upstream;
private SpoolingCallable<String, String> callable;
@Before
public void setup() {
upstream = new MockServerStreamingCallable<>();
callable = new SpoolingCallable<>(upstream);
}
@Test
public void testHappyPath() throws InterruptedException, ExecutionException {
ApiFuture<List<String>> result = callable.futureCall("request");
MockServerStreamingCall<String, String> call = upstream.popLastCall();
assertThat(call.getController().isAutoFlowControlEnabled()).isTrue();
call.getController().getObserver().onResponse("response1");
call.getController().getObserver().onResponse("response2");
call.getController().getObserver().onComplete();
assertThat(result.get()).containsExactly("response1", "response2").inOrder();
}
@Test
public void testEarlyTermination() throws Exception {
ApiFuture<List<String>> result = callable.futureCall("request");
MockServerStreamingCall<String, String> call = upstream.popLastCall();
// The caller cancels the stream while receiving responses
call.getController().getObserver().onResponse("response1");
result.cancel(true);
call.getController().getObserver().onResponse("response2");
// The cancellation should propagate upstream
Truth.assertThat(call.getController().isCancelled()).isTrue();
// Then we fake a cancellation going the other way (it will be wrapped in StatusRuntimeException
// for grpc)
call.getController()
.getObserver()
.onError(new RuntimeException("Some other upstream cancellation indicator"));
// However the inner cancellation exception will be masked by an outer CancellationException
try {
result.get();
Assert.fail("Callable should have thrown an exception");
} catch (CancellationException expected) {
Truth.assertThat(expected).hasMessageThat().contains("Task was cancelled.");
}
}
@Test
public void testNoResults() throws Exception {
ApiFuture<List<String>> result = callable.futureCall("request");
MockServerStreamingCall<String, String> call = upstream.popLastCall();
call.getController().getObserver().onComplete();
assertThat(result.get()).isEmpty();
}
}