1 /* 2 * Copyright (C) 2017 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.shared.recents.model; 18 19 import java.util.concurrent.ConcurrentLinkedQueue; 20 21 /** 22 * A Task load queue 23 */ 24 class TaskResourceLoadQueue { 25 26 private final ConcurrentLinkedQueue<Task> mQueue = new ConcurrentLinkedQueue<>(); 27 28 /** Adds a new task to the load queue */ addTask(Task t)29 void addTask(Task t) { 30 if (!mQueue.contains(t)) { 31 mQueue.add(t); 32 } 33 synchronized(this) { 34 notifyAll(); 35 } 36 } 37 38 /** 39 * Retrieves the next task from the load queue, as well as whether we want that task to be 40 * force reloaded. 41 */ nextTask()42 Task nextTask() { 43 return mQueue.poll(); 44 } 45 46 /** Removes a task from the load queue */ removeTask(Task t)47 void removeTask(Task t) { 48 mQueue.remove(t); 49 } 50 51 /** Clears all the tasks from the load queue */ clearTasks()52 void clearTasks() { 53 mQueue.clear(); 54 } 55 56 /** Returns whether the load queue is empty */ isEmpty()57 boolean isEmpty() { 58 return mQueue.isEmpty(); 59 } 60 } 61