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/*
* Copyright 2017 The gRPC 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 io.grpc.internal;
import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.fail;
import com.google.common.util.concurrent.MoreExecutors;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.Executor;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
@RunWith(JUnit4.class)
public class SerializingExecutorTest {
private SingleExecutor singleExecutor = new SingleExecutor();
private SerializingExecutor executor = new SerializingExecutor(singleExecutor);
private List<Integer> runs = new ArrayList<Integer>();
private class AddToRuns implements Runnable {
private final int val;
public AddToRuns(int val) {
this.val = val;
}
@Override
public void run() {
runs.add(val);
}
}
@Test
public void resumable() {
class CoyExecutor implements Executor {
int runCount;
@Override
public void execute(Runnable command) {
runCount++;
if (runCount == 1) {
throw new RuntimeException();
}
command.run();
}
}
executor = new SerializingExecutor(new CoyExecutor());
try {
executor.execute(new AddToRuns(1));
fail();
} catch (RuntimeException expected) {
}
// Ensure that the runnable enqueued was actually removed on the failed execute above.
executor.execute(new AddToRuns(2));
assertThat(runs).containsExactly(2);
}
@Test
public void serial() {
executor.execute(new AddToRuns(1));
assertEquals(Collections.<Integer>emptyList(), runs);
singleExecutor.drain();
assertEquals(Arrays.asList(1), runs);
executor.execute(new AddToRuns(2));
assertEquals(Arrays.asList(1), runs);
singleExecutor.drain();
assertEquals(Arrays.asList(1, 2), runs);
}
@Test
public void parallel() {
executor.execute(new AddToRuns(1));
executor.execute(new AddToRuns(2));
executor.execute(new AddToRuns(3));
assertEquals(Collections.<Integer>emptyList(), runs);
singleExecutor.drain();
assertEquals(Arrays.asList(1, 2, 3), runs);
}
@Test
public void reentrant() {
executor.execute(new Runnable() {
@Override
public void run() {
executor.execute(new AddToRuns(3));
runs.add(1);
}
});
executor.execute(new AddToRuns(2));
singleExecutor.drain();
assertEquals(Arrays.asList(1, 2, 3), runs);
}
@Test
public void testFirstRunnableThrows() {
final RuntimeException ex = new RuntimeException();
executor.execute(new Runnable() {
@Override
public void run() {
runs.add(1);
throw ex;
}
});
executor.execute(new AddToRuns(2));
executor.execute(new AddToRuns(3));
singleExecutor.drain();
assertEquals(Arrays.asList(1, 2, 3), runs);
}
@Test
public void lastRunnableThrows() {
final RuntimeException ex = new RuntimeException();
executor.execute(new AddToRuns(1));
executor.execute(new AddToRuns(2));
executor.execute(new Runnable() {
@Override
public void run() {
runs.add(3);
throw ex;
}
});
singleExecutor.drain();
assertEquals(Arrays.asList(1, 2, 3), runs);
// Scheduling more still works
executor.execute(new AddToRuns(4));
assertEquals(Arrays.asList(1, 2, 3), runs);
singleExecutor.drain();
assertEquals(Arrays.asList(1, 2, 3, 4), runs);
}
@Test
public void firstExecuteThrows() {
final RuntimeException ex = new RuntimeException();
ForwardingExecutor forwardingExecutor = new ForwardingExecutor(new Executor() {
@Override
public void execute(Runnable r) {
throw ex;
}
});
executor = new SerializingExecutor(forwardingExecutor);
try {
executor.execute(new AddToRuns(1));
fail("expected exception");
} catch (RuntimeException e) {
assertSame(ex, e);
}
assertEquals(Collections.<Integer>emptyList(), runs);
forwardingExecutor.executor = singleExecutor;
executor.execute(new AddToRuns(2));
executor.execute(new AddToRuns(3));
assertEquals(Collections.<Integer>emptyList(), runs);
singleExecutor.drain();
assertEquals(Arrays.asList(2, 3), runs);
}
@Test
public void direct() {
executor = new SerializingExecutor(MoreExecutors.directExecutor());
executor.execute(new AddToRuns(1));
assertEquals(Arrays.asList(1), runs);
executor.execute(new AddToRuns(2));
assertEquals(Arrays.asList(1, 2), runs);
executor.execute(new AddToRuns(3));
assertEquals(Arrays.asList(1, 2, 3), runs);
}
@Test
public void testDirectReentrant() {
executor = new SerializingExecutor(MoreExecutors.directExecutor());
executor.execute(new Runnable() {
@Override
public void run() {
executor.execute(new AddToRuns(2));
runs.add(1);
}
});
assertEquals(Arrays.asList(1, 2), runs);
executor.execute(new AddToRuns(3));
assertEquals(Arrays.asList(1, 2, 3), runs);
}
private static class SingleExecutor implements Executor {
private Runnable runnable;
@Override
public void execute(Runnable r) {
if (runnable != null) {
fail("Already have runnable scheduled");
}
runnable = r;
}
public void drain() {
if (runnable != null) {
Runnable r = runnable;
runnable = null;
r.run();
}
}
}
private static class ForwardingExecutor implements Executor {
Executor executor;
public ForwardingExecutor(Executor executor) {
this.executor = executor;
}
@Override
public void execute(Runnable r) {
executor.execute(r);
}
}
}
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