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Diffstat (limited to 'src/com/android/launcher3/util/Executors.java')
-rw-r--r-- | src/com/android/launcher3/util/Executors.java | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/src/com/android/launcher3/util/Executors.java b/src/com/android/launcher3/util/Executors.java new file mode 100644 index 000000000..4d5ee49e8 --- /dev/null +++ b/src/com/android/launcher3/util/Executors.java @@ -0,0 +1,87 @@ +/* + * 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")); +} |