1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.systemui.recents.misc; 18 19 import android.os.Handler; 20 import android.os.HandlerThread; 21 22 /** 23 * Similar to {@link com.android.internal.os.BackgroundThread}, this is a shared singleton 24 * foreground thread for each process. 25 */ 26 public final class ForegroundThread extends HandlerThread { 27 private static ForegroundThread sInstance; 28 private static Handler sHandler; 29 30 private ForegroundThread() { 31 super("recents.fg"); 32 } 33 34 private static void ensureThreadLocked() { 35 if (sInstance == null) { 36 sInstance = new ForegroundThread(); 37 sInstance.start(); 38 sHandler = new Handler(sInstance.getLooper()); 39 } 40 } 41 42 public static ForegroundThread get() { 43 synchronized (ForegroundThread.class) { 44 ensureThreadLocked(); 45 return sInstance; 46 } 47 } 48 49 public static Handler getHandler() { 50 synchronized (ForegroundThread.class) { 51 ensureThreadLocked(); 52 return sHandler; 53 } 54 } 55 } 56
