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/*
* Copyright (C) 2011 The Guava Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.common.util.concurrent;
import static com.google.common.truth.Truth.assertThat;
import static com.google.common.util.concurrent.Futures.addCallback;
import static com.google.common.util.concurrent.MoreExecutors.directExecutor;
import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import java.util.concurrent.CancellationException;
import java.util.concurrent.Executor;
import javax.annotation.CheckForNull;
import junit.framework.TestCase;
import org.mockito.Mockito;
/**
* Test for {@link FutureCallback}.
*
* @author Anthony Zana
*/
@GwtCompatible(emulated = true)
public class FutureCallbackTest extends TestCase {
public void testSameThreadSuccess() {
SettableFuture<String> f = SettableFuture.create();
MockCallback callback = new MockCallback("foo");
addCallback(f, callback, directExecutor());
f.set("foo");
}
public void testExecutorSuccess() {
CountingSameThreadExecutor ex = new CountingSameThreadExecutor();
SettableFuture<String> f = SettableFuture.create();
MockCallback callback = new MockCallback("foo");
Futures.addCallback(f, callback, ex);
f.set("foo");
assertEquals(1, ex.runCount);
}
// Error cases
public void testSameThreadExecutionException() {
SettableFuture<String> f = SettableFuture.create();
Exception e = new IllegalArgumentException("foo not found");
MockCallback callback = new MockCallback(e);
addCallback(f, callback, directExecutor());
f.setException(e);
}
public void testCancel() {
SettableFuture<String> f = SettableFuture.create();
FutureCallback<String> callback =
new FutureCallback<String>() {
private boolean called = false;
@Override
public void onSuccess(String result) {
fail("Was not expecting onSuccess() to be called.");
}
@Override
public synchronized void onFailure(Throwable t) {
assertFalse(called);
assertThat(t).isInstanceOf(CancellationException.class);
called = true;
}
};
addCallback(f, callback, directExecutor());
f.cancel(true);
}
public void testThrowErrorFromGet() {
Error error = new AssertionError("ASSERT!");
ListenableFuture<String> f = UncheckedThrowingFuture.throwingError(error);
MockCallback callback = new MockCallback(error);
addCallback(f, callback, directExecutor());
}
public void testRuntimeExeceptionFromGet() {
RuntimeException e = new IllegalArgumentException("foo not found");
ListenableFuture<String> f = UncheckedThrowingFuture.throwingRuntimeException(e);
MockCallback callback = new MockCallback(e);
addCallback(f, callback, directExecutor());
}
@GwtIncompatible // Mockito
public void testOnSuccessThrowsRuntimeException() throws Exception {
RuntimeException exception = new RuntimeException();
String result = "result";
SettableFuture<String> future = SettableFuture.create();
@SuppressWarnings("unchecked") // Safe for a mock
FutureCallback<String> callback = Mockito.mock(FutureCallback.class);
addCallback(future, callback, directExecutor());
Mockito.doThrow(exception).when(callback).onSuccess(result);
future.set(result);
assertEquals(result, future.get());
Mockito.verify(callback).onSuccess(result);
Mockito.verifyNoMoreInteractions(callback);
}
@GwtIncompatible // Mockito
public void testOnSuccessThrowsError() throws Exception {
class TestError extends Error {}
TestError error = new TestError();
String result = "result";
SettableFuture<String> future = SettableFuture.create();
@SuppressWarnings("unchecked") // Safe for a mock
FutureCallback<String> callback = Mockito.mock(FutureCallback.class);
addCallback(future, callback, directExecutor());
Mockito.doThrow(error).when(callback).onSuccess(result);
try {
future.set(result);
fail("Should have thrown");
} catch (TestError e) {
assertSame(error, e);
}
assertEquals(result, future.get());
Mockito.verify(callback).onSuccess(result);
Mockito.verifyNoMoreInteractions(callback);
}
public void testWildcardFuture() {
SettableFuture<String> settable = SettableFuture.create();
ListenableFuture<?> f = settable;
FutureCallback<Object> callback =
new FutureCallback<Object>() {
@Override
public void onSuccess(Object result) {}
@Override
public void onFailure(Throwable t) {}
};
addCallback(f, callback, directExecutor());
}
private class CountingSameThreadExecutor implements Executor {
int runCount = 0;
@Override
public void execute(Runnable command) {
command.run();
runCount++;
}
}
private final class MockCallback implements FutureCallback<String> {
@CheckForNull private String value = null;
@CheckForNull private Throwable failure = null;
private boolean wasCalled = false;
MockCallback(String expectedValue) {
this.value = expectedValue;
}
public MockCallback(Throwable expectedFailure) {
this.failure = expectedFailure;
}
@Override
public synchronized void onSuccess(String result) {
assertFalse(wasCalled);
wasCalled = true;
assertEquals(value, result);
}
@Override
public synchronized void onFailure(Throwable t) {
assertFalse(wasCalled);
wasCalled = true;
assertEquals(failure, t);
}
}
}
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