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// Copyright 2017 The Bazel Authors. All rights reserved.
//
// 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.devtools.build.android;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.ListeningExecutorService;
import com.google.common.util.concurrent.MoreExecutors;
import java.io.Closeable;
import java.io.IOException;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
/** Shutdowns and verifies that no tasks are running in the executor service. */
final class ExecutorServiceCloser implements Closeable, ListeningExecutorService {
private final ListeningExecutorService executorService;
private ExecutorServiceCloser(ListeningExecutorService executorService) {
this.executorService = executorService;
}
@Override
public void close() throws IOException {
List<Runnable> unfinishedTasks = executorService.shutdownNow();
if (!unfinishedTasks.isEmpty()) {
throw new IOException(
"Shutting down the executor with unfinished tasks:" + unfinishedTasks.size());
}
}
public static ExecutorServiceCloser createWithFixedPoolOf(int numThreads) {
return new ExecutorServiceCloser(
MoreExecutors.listeningDecorator(Executors.newFixedThreadPool(numThreads)));
}
public static ExecutorServiceCloser createWith(ListeningExecutorService executorService) {
return new ExecutorServiceCloser(executorService);
}
/**
* Creates a {@link ListeningExecutorService} with a sane sized thread pool based on our current
* metrics.
*/
public static ListeningExecutorService createDefaultService() {
// The reported availableProcessors may be higher than the actual resources
// (on a shared system). On the other hand, a lot of the work is I/O, so it's not completely
// CPU bound. As a compromise, divide by 2 the reported availableProcessors.
int numThreads = Math.max(1, Runtime.getRuntime().availableProcessors() / 2);
final ListeningExecutorService executorService =
MoreExecutors.listeningDecorator(Executors.newFixedThreadPool(numThreads));
return executorService;
}
// Delegate methods below
@Override
public <T> ListenableFuture<T> submit(Callable<T> task) {
return executorService.submit(task);
}
@Override
public ListenableFuture<?> submit(Runnable task) {
return executorService.submit(task);
}
@Override
public <T> ListenableFuture<T> submit(Runnable task, T result) {
return executorService.submit(task, result);
}
@Override
public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks)
throws InterruptedException {
return executorService.invokeAll(tasks);
}
@Override
public <T> List<Future<T>> invokeAll(
Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit)
throws InterruptedException {
return executorService.invokeAll(tasks, timeout, unit);
}
@Override
public void shutdown() {
executorService.shutdown();
}
@Override
public List<Runnable> shutdownNow() {
return executorService.shutdownNow();
}
@Override
public boolean isShutdown() {
return executorService.isShutdown();
}
@Override
public boolean isTerminated() {
return executorService.isTerminated();
}
@Override
public boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException {
return executorService.awaitTermination(timeout, unit);
}
@Override
public <T> T invokeAny(Collection<? extends Callable<T>> tasks)
throws InterruptedException, ExecutionException {
return executorService.invokeAny(tasks);
}
@Override
public <T> T invokeAny(Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit)
throws InterruptedException, ExecutionException, TimeoutException {
return executorService.invokeAny(tasks, timeout, unit);
}
@Override
public void execute(Runnable command) {
executorService.execute(command);
}
}
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