/*
* Copyright (C) 2012 Facebook, Inc.
*
* 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.facebook.testing;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.IdentityHashMap;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
public class MockExecutor implements ScheduledExecutorService {
private final List<AnnotatedRunnable> runnableList =
Collections.synchronizedList(new ArrayList<AnnotatedRunnable>());
private final CountDownLatch latch = new CountDownLatch(1);
private final IdentityHashMap<ScheduledFuture<?>, ScheduledFuture<?>>
outstandingTasks = new IdentityHashMap<ScheduledFuture<?>, ScheduledFuture<?>>();
private volatile boolean rejectSubmission = false;
private volatile boolean isShutdown = false;
private volatile boolean isTerminated = false;
public List<AnnotatedRunnable> getRunnableList() {
return runnableList;
}
public void setShutdown(boolean shutdown) {
isShutdown = shutdown;
}
public void setTerminated(boolean terminated) {
isTerminated = terminated;
}
public void setRejectSubmission(boolean rejectSubmission) {
this.rejectSubmission = rejectSubmission;
}
public void triggerShutdownLatch() {
latch.countDown();
}
public AnnotatedRunnable removeHead() {
return runnableList.isEmpty() ? null : runnableList.remove(0);
}
public int getNumPendingTasks() {
return runnableList.size();
}
@Override
public ScheduledFuture<?> schedule(final Runnable command, long delay, TimeUnit unit) {
if (rejectSubmission) {
throw new RejectedExecutionException();
}
runnableList.add(new AnnotatedRunnable(command, delay, delay, unit));
return new MockScheduledFuture<Void>(toCallable(command));
}
private <T> Callable toCallable(final Runnable runnable, final T result) {
return new Callable<T>() {
@Override
public T call() throws Exception {
runnable.run();
return result;
}
};
}
private Callable<Void> toCallable(Runnable runnable) {
return toCallable(new AnnotatedRunnable(runnable), (Void) null);
}
@Override
public <V> ScheduledFuture<V> schedule(
Callable<V> callable, long delay, TimeUnit unit
) {
if (rejectSubmission) {
throw new RejectedExecutionException();
}
MockScheduledFuture<V> future = new MockScheduledFuture<>(callable);
AnnotatedRunnable runnable = new AnnotatedRunnable(future, delay, delay, unit);
runnable.setFuture(future);
runnableList.add(runnable);
outstandingTasks.put(future, future);
return future;
}
@Override
public ScheduledFuture<?> scheduleAtFixedRate(
Runnable command, long initialDelay, long period, TimeUnit unit
) {
if (rejectSubmission) {
throw new RejectedExecutionException();
}
AnnotatedRunnable runnable =
new AnnotatedRunnable(command, initialDelay, period, unit);
runnableList.add(runnable);
MockScheduledFuture<Void> future = new MockScheduledFuture<Void>(
Executors.<Void>callable(runnable, (Void) null)
);
runnable.setFuture(future);
outstandingTasks.put(future, future);
return future;
}
@Override
public ScheduledFuture<?> scheduleWithFixedDelay(
Runnable command, long initialDelay, long delay, TimeUnit unit
) {
if (rejectSubmission) {
throw new RejectedExecutionException();
}
AnnotatedRunnable runnable =
new AnnotatedRunnable(command, initialDelay, delay, unit);
runnableList.add(runnable);
MockScheduledFuture<Void> future = new MockScheduledFuture<Void>(
Executors.<Void>callable(runnable, (Void) null)
);
runnable.setFuture(future);
outstandingTasks.put(future, future);
return future;
}
@Override
public void shutdown() {
cancelPendingTasks();
isShutdown = true;
}
@Override
public List<Runnable> shutdownNow() {
cancelPendingTasks();
return new ArrayList<Runnable>(runnableList);
}
private void cancelPendingTasks() {
for (IdentityHashMap.Entry<ScheduledFuture<?>, ScheduledFuture<?>> entry :
outstandingTasks.entrySet()
) {
entry.getValue().cancel(false);
}
}
@Override
public boolean isShutdown() {
return isShutdown;
}
@Override
public boolean isTerminated() {
return isTerminated;
}
@Override
public boolean awaitTermination(long timeout, TimeUnit unit)
throws InterruptedException {
return true;
}
@Override
public <T> Future<T> submit(final Callable<T> task) {
runnableList.add(new AnnotatedRunnable(new Runnable() {
@Override
public void run() {
try {
task.call();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}));
return new MockScheduledFuture<T>(task);
}
@Override
public <T> Future<T> submit(Runnable task, T result) {
runnableList.add(new AnnotatedRunnable(task));
return new MockScheduledFuture<T>(toCallable(task, result));
}
@Override
public Future<?> submit(Runnable task) {
runnableList.add(new AnnotatedRunnable(task));
return new MockScheduledFuture<Void>(toCallable(task));
}
@Override
public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks)
throws InterruptedException {
throw new UnsupportedOperationException();
}
@Override
public <T> List<Future<T>> invokeAll(
Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit
) throws InterruptedException {
throw new UnsupportedOperationException();
}
@Override
public <T> T invokeAny(Collection<? extends Callable<T>> tasks)
throws InterruptedException, ExecutionException {
throw new UnsupportedOperationException();
}
@Override
public <T> T invokeAny(
Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit
) throws InterruptedException, ExecutionException, TimeoutException {
throw new UnsupportedOperationException();
}
@Override
public void execute(Runnable command) {
schedule(command, 0, TimeUnit.SECONDS);
}
/**
* runs all tasks in the executor in the current thread
*/
public void drain() {
while (getNumPendingTasks() > 0) {
removeHead().run();
}
}
public void drain(int maxTasks) {
for (int i = 0; i < maxTasks && getNumPendingTasks() > 0; i++)
removeHead().run();
}
}