1 /*
2  * Copyright (C) 2023 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.car.portraitlauncher.homeactivities;
18 
19 import android.app.ActivityManager;
20 import android.app.ActivityTaskManager;
21 import android.app.TaskInfo;
22 import android.content.Context;
23 import android.content.Intent;
24 import android.os.Build;
25 import android.util.Log;
26 
27 import java.util.ArrayDeque;
28 import java.util.Queue;
29 
30 /**
31  * A simple class to cancel, cache, start tasks.
32  */
33 class TaskInfoCache {
34     public static final String TAG = TaskInfoCache.class.getSimpleName();
35     private static final boolean DBG = Build.IS_DEBUGGABLE;
36     private final ActivityTaskManager mActivityTaskManager;
37     private final Queue<TaskInfo> mCachedTaskQueue;
38     private final Context mContext;
39 
TaskInfoCache(Context context)40     TaskInfoCache(Context context) {
41         mContext = context;
42         mActivityTaskManager = ActivityTaskManager.getInstance();
43         mCachedTaskQueue = new ArrayDeque<>();
44     }
45 
46     /** Cancel the given task */
cancelTask(ActivityManager.RunningTaskInfo taskInfo)47     boolean cancelTask(ActivityManager.RunningTaskInfo taskInfo) {
48         logIfDebuggable("Cancel task " + taskInfo);
49         if (mActivityTaskManager == null) {
50             throw new RuntimeException("ActivityTaskManager cannot be null");
51         }
52 
53         return mActivityTaskManager.removeTask(taskInfo.taskId);
54     }
55 
56     /** Cache the given task and save it to queue {@code mCancelledTaskQueue}. */
cacheTask(ActivityManager.RunningTaskInfo taskInfo)57     boolean cacheTask(ActivityManager.RunningTaskInfo taskInfo) {
58         logIfDebuggable("Cache task " + taskInfo);
59         return mCachedTaskQueue.add(taskInfo);
60     }
61 
62     /** Start the task in {@code mCancelledTaskQueue} in order. */
startCachedTasks()63     void startCachedTasks() {
64         logIfDebuggable("Start cached tasks, tasks size =" + mCachedTaskQueue.size());
65         while (!mCachedTaskQueue.isEmpty()) {
66             Intent intent = mCachedTaskQueue.remove().baseIntent;
67             try {
68                 logIfDebuggable("Start cached task " + intent);
69                 mContext.startActivity(intent);
70             } catch (SecurityException e) {
71                 Log.e(TAG, "Failed to launch cached task", e);
72             }
73         }
74     }
75 
logIfDebuggable(String message)76     private static void logIfDebuggable(String message) {
77         if (DBG) {
78             Log.d(TAG, message);
79         }
80     }
81 }
82