1 /*
2  * Copyright (C) 2016 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.packageinstaller;
18 
19 import android.content.BroadcastReceiver;
20 import android.content.Context;
21 import android.content.Intent;
22 import android.support.annotation.NonNull;
23 
24 /**
25  * Receives install events and perists them using a {@link EventResultPersister}.
26  */
27 public class InstallEventReceiver extends BroadcastReceiver {
28     private static final Object sLock = new Object();
29     private static EventResultPersister sReceiver;
30 
31     /**
32      * Get the event receiver persisting the results
33      *
34      * @return The event receiver.
35      */
getReceiver(@onNull Context context)36     @NonNull private static EventResultPersister getReceiver(@NonNull Context context) {
37         synchronized (sLock) {
38             if (sReceiver == null) {
39                 sReceiver = new EventResultPersister(
40                         TemporaryFileManager.getInstallStateFile(context));
41             }
42         }
43 
44         return sReceiver;
45     }
46 
47     @Override
onReceive(Context context, Intent intent)48     public void onReceive(Context context, Intent intent) {
49         getReceiver(context).onEventReceived(context, intent);
50     }
51 
52     /**
53      * Add an observer. If there is already an event for this id, call back inside of this call.
54      *
55      * @param context  A context of the current app
56      * @param id       The id the observer is for or {@code GENERATE_NEW_ID} to generate a new one.
57      * @param observer The observer to call back.
58      *
59      * @return The id for this event
60      */
addObserver(@onNull Context context, int id, @NonNull EventResultPersister.EventResultObserver observer)61     static int addObserver(@NonNull Context context, int id,
62             @NonNull EventResultPersister.EventResultObserver observer)
63             throws EventResultPersister.OutOfIdsException {
64         return getReceiver(context).addObserver(id, observer);
65     }
66 
67     /**
68      * Remove a observer.
69      *
70      * @param context  A context of the current app
71      * @param id The id the observer was added for
72      */
removeObserver(@onNull Context context, int id)73     static void removeObserver(@NonNull Context context, int id) {
74         getReceiver(context).removeObserver(id);
75     }
76 }
77