| /* |
| * Copyright (C) 2019 The Android Open Source Project |
| * |
| * 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.android.apksig.util; |
| |
| import static java.util.concurrent.TimeUnit.MILLISECONDS; |
| |
| import java.util.concurrent.ArrayBlockingQueue; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Phaser; |
| import java.util.concurrent.ThreadPoolExecutor; |
| |
| public interface RunnablesExecutor { |
| static final RunnablesExecutor SINGLE_THREADED = p -> p.createRunnable().run(); |
| |
| static final RunnablesExecutor MULTI_THREADED = new RunnablesExecutor() { |
| private final int PARALLELISM = Math.min(32, Runtime.getRuntime().availableProcessors()); |
| private final int QUEUE_SIZE = 4; |
| |
| @Override |
| public void execute(RunnablesProvider provider) { |
| final ExecutorService mExecutor = |
| new ThreadPoolExecutor(PARALLELISM, PARALLELISM, |
| 0L, MILLISECONDS, |
| new ArrayBlockingQueue<>(QUEUE_SIZE), |
| new ThreadPoolExecutor.CallerRunsPolicy()); |
| |
| Phaser tasks = new Phaser(1); |
| |
| for (int i = 0; i < PARALLELISM; ++i) { |
| Runnable task = () -> { |
| Runnable r = provider.createRunnable(); |
| r.run(); |
| tasks.arriveAndDeregister(); |
| }; |
| tasks.register(); |
| mExecutor.execute(task); |
| } |
| |
| // Waiting for the tasks to complete. |
| tasks.arriveAndAwaitAdvance(); |
| |
| mExecutor.shutdownNow(); |
| } |
| }; |
| |
| void execute(RunnablesProvider provider); |
| } |