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.server.wm; 18 19 import android.app.ActivityManager.RunningTaskInfo; 20 import android.app.WindowConfiguration.ActivityType; 21 import android.app.WindowConfiguration.WindowingMode; 22 23 import java.util.ArrayList; 24 import java.util.Comparator; 25 import java.util.Iterator; 26 import java.util.List; 27 import java.util.TreeSet; 28 29 /** 30 * Class for resolving the set of running tasks in the system. 31 */ 32 class RunningTasks { 33 34 // Comparator to sort by last active time (descending) 35 private static final Comparator<TaskRecord> LAST_ACTIVE_TIME_COMPARATOR = 36 (o1, o2) -> Long.signum(o2.lastActiveTime - o1.lastActiveTime); 37 38 private final TreeSet<TaskRecord> mTmpSortedSet = new TreeSet<>(LAST_ACTIVE_TIME_COMPARATOR); 39 private final ArrayList<TaskRecord> mTmpStackTasks = new ArrayList<>(); 40 getTasks(int maxNum, List<RunningTaskInfo> list, @ActivityType int ignoreActivityType, @WindowingMode int ignoreWindowingMode, ArrayList<ActivityDisplay> activityDisplays, int callingUid, boolean allowed)41 void getTasks(int maxNum, List<RunningTaskInfo> list, @ActivityType int ignoreActivityType, 42 @WindowingMode int ignoreWindowingMode, ArrayList<ActivityDisplay> activityDisplays, 43 int callingUid, boolean allowed) { 44 // Return early if there are no tasks to fetch 45 if (maxNum <= 0) { 46 return; 47 } 48 49 // Gather all of the tasks across all of the tasks, and add them to the sorted set 50 mTmpSortedSet.clear(); 51 final int numDisplays = activityDisplays.size(); 52 for (int displayNdx = 0; displayNdx < numDisplays; ++displayNdx) { 53 final ActivityDisplay display = activityDisplays.get(displayNdx); 54 for (int stackNdx = display.getChildCount() - 1; stackNdx >= 0; --stackNdx) { 55 final ActivityStack stack = display.getChildAt(stackNdx); 56 mTmpStackTasks.clear(); 57 stack.getRunningTasks(mTmpStackTasks, ignoreActivityType, ignoreWindowingMode, 58 callingUid, allowed); 59 mTmpSortedSet.addAll(mTmpStackTasks); 60 } 61 } 62 63 // Take the first {@param maxNum} tasks and create running task infos for them 64 final Iterator<TaskRecord> iter = mTmpSortedSet.iterator(); 65 while (iter.hasNext()) { 66 if (maxNum == 0) { 67 break; 68 } 69 70 final TaskRecord task = iter.next(); 71 list.add(createRunningTaskInfo(task)); 72 maxNum--; 73 } 74 } 75 76 /** 77 * Constructs a {@link RunningTaskInfo} from a given {@param task}. 78 */ createRunningTaskInfo(TaskRecord task)79 private RunningTaskInfo createRunningTaskInfo(TaskRecord task) { 80 final RunningTaskInfo rti = new RunningTaskInfo(); 81 task.fillTaskInfo(rti); 82 // Fill in some deprecated values 83 rti.id = rti.taskId; 84 return rti; 85 } 86 } 87