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/*
* Copyright (C) 2024 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.avatarpicker;
import android.os.Handler;
import android.os.Looper;
import androidx.annotation.NonNull;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.ListeningExecutorService;
import com.google.common.util.concurrent.MoreExecutors;
import java.util.concurrent.Callable;
import java.util.concurrent.Executors;
// copied from SettinsLib/utils
public class ThreadUtils {
private static volatile Thread sMainThread;
private static volatile Handler sMainThreadHandler;
private static volatile ListeningExecutorService sListeningService;
/**
* 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.
*/
@NonNull
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.
*/
@SuppressWarnings("rawtypes")
@NonNull
public static ListenableFuture postOnBackgroundThread(@NonNull Runnable runnable) {
return getBackgroundExecutor().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.
*/
@NonNull
public static <T> ListenableFuture<T> postOnBackgroundThread(@NonNull Callable<T> callable) {
return getBackgroundExecutor().submit(callable);
}
/**
* Posts the runnable on the main thread.
*
* @deprecated moving work to the main thread should be done via the main executor provided to
* {@link com.google.common.util.concurrent.FutureCallback} via
* {@link android.content.Context#getMainExecutor()} or by calling an SDK method such as
* {@link android.app.Activity#runOnUiThread(Runnable)} or
* {@link android.content.Context#getMainThreadHandler()} where appropriate.
*/
@Deprecated
public static void postOnMainThread(@NonNull Runnable runnable) {
getUiThreadHandler().post(runnable);
}
/**
* Provides a shared {@link ListeningExecutorService} created using a fixed thread pool executor
*/
@NonNull
public static synchronized ListeningExecutorService getBackgroundExecutor() {
if (sListeningService == null) {
sListeningService = MoreExecutors.listeningDecorator(Executors.newFixedThreadPool(
Runtime.getRuntime().availableProcessors()));
}
return sListeningService;
}
}