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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"));
+}