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/*
* Copyright (C) 2008 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.launcher3.util;
import android.os.HandlerThread;
import android.os.Looper;
import android.os.Process;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
/**
* Various different executors used in Launcher
*/
public class Executors {
private static final int POOL_SIZE =
Math.max(Runtime.getRuntime().availableProcessors(), 2);
private static final int KEEP_ALIVE = 1;
/** Dedicated executor instances for work depending on other packages. */
private static final Map<String, LooperExecutor> PACKAGE_EXECUTORS = new ConcurrentHashMap<>();
/**
* An {@link ThreadPoolExecutor} to be used with async task with no limit on the queue size.
*/
public static final ThreadPoolExecutor THREAD_POOL_EXECUTOR = new ThreadPoolExecutor(
POOL_SIZE, POOL_SIZE, KEEP_ALIVE, TimeUnit.SECONDS, new LinkedBlockingQueue<>());
/**
* Returns the executor for running tasks on the main thread.
*/
public static final LooperExecutor MAIN_EXECUTOR =
new LooperExecutor(Looper.getMainLooper());
/**
* A background executor for using time sensitive actions where user is waiting for response.
*/
public static final LooperExecutor UI_HELPER_EXECUTOR =
new LooperExecutor(
createAndStartNewLooper("UiThreadHelper", Process.THREAD_PRIORITY_FOREGROUND));
/**
* Utility method to get a started handler thread statically
*/
public static Looper createAndStartNewLooper(String name) {
return createAndStartNewLooper(name, Process.THREAD_PRIORITY_DEFAULT);
}
/**
* Utility method to get a started handler thread statically with the provided priority
*/
public static Looper createAndStartNewLooper(String name, int priority) {
HandlerThread thread = new HandlerThread(name, priority);
thread.start();
return thread.getLooper();
}
/**
* Executor used for running Launcher model related tasks (eg loading icons or updated db)
*/
public static final LooperExecutor MODEL_EXECUTOR =
new LooperExecutor(createAndStartNewLooper("launcher-loader"));
/**
* Returns and caches a single thread executor for a given package.
*
* @param packageName Package associated with the executor.
*/
public static LooperExecutor getPackageExecutor(String packageName) {
return PACKAGE_EXECUTORS.computeIfAbsent(
packageName, p -> new LooperExecutor(
createAndStartNewLooper(p, Process.THREAD_PRIORITY_DEFAULT)));
}
/**
* A simple ThreadFactory to set the thread name and priority when used with executors.
*/
public static class SimpleThreadFactory implements ThreadFactory {
private final int mPriority;
private final String mNamePrefix;
private final AtomicInteger mCount = new AtomicInteger(0);
public SimpleThreadFactory(String namePrefix, int priority) {
mNamePrefix = namePrefix;
mPriority = priority;
}
@Override
public Thread newThread(Runnable runnable) {
Thread t = new Thread(() -> {
Process.setThreadPriority(mPriority);
runnable.run();
}, mNamePrefix + mCount.incrementAndGet());
return t;
}
}
}
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