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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.concurrent.Executor;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
/**
* Various different executors used in Launcher
*/
public class Executors {
// These values are same as that in {@link AsyncTask}.
private static final int CPU_COUNT = Runtime.getRuntime().availableProcessors();
private static final int CORE_POOL_SIZE = CPU_COUNT + 1;
private static final int MAXIMUM_POOL_SIZE = CPU_COUNT * 2 + 1;
private static final int KEEP_ALIVE = 1;
/**
* An {@link Executor} to be used with async task with no limit on the queue size.
*/
public static final Executor THREAD_POOL_EXECUTOR = new ThreadPoolExecutor(
CORE_POOL_SIZE, MAXIMUM_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(createAndStartNewForegroundLooper("UiThreadHelper"));
/**
* 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();
}
/**
* Similar to {@link #createAndStartNewLooper(String)}, but starts the thread with
* foreground priority.
* Think before using
*/
public static Looper createAndStartNewForegroundLooper(String name) {
return createAndStartNewLooper(name, Process.THREAD_PRIORITY_FOREGROUND);
}
/**
* 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"));
}
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