/*
* 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);
}