| /* |
| * Copyright (C) 2017 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.server.am; |
| |
| import android.app.ActivityManager.RunningTaskInfo; |
| import android.app.WindowConfiguration.ActivityType; |
| import android.app.WindowConfiguration.WindowingMode; |
| |
| import java.util.ArrayList; |
| import java.util.Comparator; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.TreeSet; |
| |
| /** |
| * Class for resolving the set of running tasks in the system. |
| */ |
| class RunningTasks { |
| |
| // Comparator to sort by last active time (descending) |
| private static final Comparator<TaskRecord> LAST_ACTIVE_TIME_COMPARATOR = |
| (o1, o2) -> Long.signum(o2.lastActiveTime - o1.lastActiveTime); |
| |
| private final TaskRecord.TaskActivitiesReport mTmpReport = |
| new TaskRecord.TaskActivitiesReport(); |
| private final TreeSet<TaskRecord> mTmpSortedSet = new TreeSet<>(LAST_ACTIVE_TIME_COMPARATOR); |
| private final ArrayList<TaskRecord> mTmpStackTasks = new ArrayList<>(); |
| |
| void getTasks(int maxNum, List<RunningTaskInfo> list, @ActivityType int ignoreActivityType, |
| @WindowingMode int ignoreWindowingMode, ArrayList<ActivityDisplay> activityDisplays, |
| int callingUid, boolean allowed) { |
| // Return early if there are no tasks to fetch |
| if (maxNum <= 0) { |
| return; |
| } |
| |
| // Gather all of the tasks across all of the tasks, and add them to the sorted set |
| mTmpSortedSet.clear(); |
| final int numDisplays = activityDisplays.size(); |
| for (int displayNdx = 0; displayNdx < numDisplays; ++displayNdx) { |
| final ActivityDisplay display = activityDisplays.get(displayNdx); |
| for (int stackNdx = display.getChildCount() - 1; stackNdx >= 0; --stackNdx) { |
| final ActivityStack stack = display.getChildAt(stackNdx); |
| mTmpStackTasks.clear(); |
| stack.getRunningTasks(mTmpStackTasks, ignoreActivityType, ignoreWindowingMode, |
| callingUid, allowed); |
| mTmpSortedSet.addAll(mTmpStackTasks); |
| } |
| } |
| |
| // Take the first {@param maxNum} tasks and create running task infos for them |
| final Iterator<TaskRecord> iter = mTmpSortedSet.iterator(); |
| while (iter.hasNext()) { |
| if (maxNum == 0) { |
| break; |
| } |
| |
| final TaskRecord task = iter.next(); |
| list.add(createRunningTaskInfo(task)); |
| maxNum--; |
| } |
| } |
| |
| /** |
| * Constructs a {@link RunningTaskInfo} from a given {@param task}. |
| */ |
| private RunningTaskInfo createRunningTaskInfo(TaskRecord task) { |
| final RunningTaskInfo rti = new RunningTaskInfo(); |
| task.fillTaskInfo(rti, mTmpReport); |
| // Fill in some deprecated values |
| rti.id = rti.taskId; |
| return rti; |
| } |
| } |