| // 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.ListeningExecutorService; |
| import com.google.common.util.concurrent.MoreExecutors; |
| import java.io.Closeable; |
| import java.io.IOException; |
| import java.util.List; |
| import java.util.concurrent.Executors; |
| |
| /** Shutdowns and verifies that no tasks are running in the executor service. */ |
| final class ExecutorServiceCloser implements Closeable { |
| 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 Closeable 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; |
| } |
| } |