| /* |
| * 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.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 ThreadPoolExecutor} to be used with async task with no limit on the queue size. |
| */ |
| public static final ThreadPoolExecutor 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")); |
| } |