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/*
* Copyright (C) 2016 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.settingslib.utils;
import android.os.Handler;
import android.os.Looper;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
public class ThreadUtils {
private static volatile Thread sMainThread;
private static volatile Handler sMainThreadHandler;
private static volatile ExecutorService sThreadExecutor;
/**
* Returns true if the current thread is the UI thread.
*/
public static boolean isMainThread() {
if (sMainThread == null) {
sMainThread = Looper.getMainLooper().getThread();
}
return Thread.currentThread() == sMainThread;
}
/**
* Returns a shared UI thread handler.
*/
public static Handler getUiThreadHandler() {
if (sMainThreadHandler == null) {
sMainThreadHandler = new Handler(Looper.getMainLooper());
}
return sMainThreadHandler;
}
/**
* Checks that the current thread is the UI thread. Otherwise throws an exception.
*/
public static void ensureMainThread() {
if (!isMainThread()) {
throw new RuntimeException("Must be called on the UI thread");
}
}
/**
* Posts runnable in background using shared background thread pool.
*
* @Return A future of the task that can be monitored for updates or cancelled.
*/
public static Future postOnBackgroundThread(Runnable runnable) {
return getThreadExecutor().submit(runnable);
}
/**
* Posts callable in background using shared background thread pool.
*
* @Return A future of the task that can be monitored for updates or cancelled.
*/
public static Future postOnBackgroundThread(Callable callable) {
return getThreadExecutor().submit(callable);
}
/**
* Posts the runnable on the main thread.
*/
public static void postOnMainThread(Runnable runnable) {
getUiThreadHandler().post(runnable);
}
private static synchronized ExecutorService getThreadExecutor() {
if (sThreadExecutor == null) {
sThreadExecutor = Executors.newFixedThreadPool(
Runtime.getRuntime().availableProcessors());
}
return sThreadExecutor;
}
}
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