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1 // Copyright 2017 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 package org.chromium.components.background_task_scheduler; | |
6 | |
7 import android.content.SharedPreferences; | |
8 | |
9 import org.chromium.base.ContextUtils; | |
10 | |
11 import java.util.HashSet; | |
12 import java.util.Set; | |
13 | |
14 /** | |
15 * Class handling shared preference entries for BackgroundTaskScheduler. | |
16 */ | |
17 public class BackgroundTaskSchedulerPrefs { | |
18 private static final String TAG = "BTSPrefs"; | |
19 private static final String KEY_SCHEDULED_TASKS = "bts_scheduled_tasks"; | |
20 private static final String KEY_LAST_OS_VERSION = "bts_last_os_version"; | |
21 private static final String KEY_LAST_APP_VERSION = "bts_last_app_version"; | |
22 private static final String ENTRY_SEPARATOR = ":"; | |
23 | |
24 /** Adds a task to scheduler's preferences, so that it can be rescheduled wi th OS upgrade. */ | |
25 public static void addScheduledTask(TaskInfo taskInfo) { | |
26 SharedPreferences prefs = ContextUtils.getAppSharedPreferences(); | |
27 Set<String> scheduledTasks = | |
28 prefs.getStringSet(KEY_SCHEDULED_TASKS, new HashSet<String>(1)); | |
29 String prefsEntry = toSharedPreferenceEntry(taskInfo); | |
30 if (scheduledTasks.contains(prefsEntry)) return; | |
31 | |
32 // Set returned from getStringSet() should not be modified. | |
33 scheduledTasks = new HashSet<>(scheduledTasks); | |
34 scheduledTasks.add(prefsEntry); | |
35 updateScheduledTasks(prefs, scheduledTasks); | |
36 } | |
37 | |
38 /** Removes a task from scheduler's preferences. */ | |
39 public static void removeScheduledTask(int taskId) { | |
40 SharedPreferences prefs = ContextUtils.getAppSharedPreferences(); | |
41 Set<String> scheduledTasks = prefs.getStringSet(KEY_SCHEDULED_TASKS, new HashSet<String>()); | |
42 | |
43 String entryToRemove = null; | |
44 String taskSuffix = ENTRY_SEPARATOR + taskId; | |
45 for (String entry : scheduledTasks) { | |
46 if (entry.endsWith(taskSuffix)) { | |
47 entryToRemove = entry; | |
48 break; | |
49 } | |
50 } | |
51 | |
52 // Entry matching taskId was not found. | |
53 if (entryToRemove == null) return; | |
54 | |
55 // Set returned from getStringSet() should not be modified. | |
56 scheduledTasks = new HashSet<>(scheduledTasks); | |
57 scheduledTasks.remove(entryToRemove); | |
58 updateScheduledTasks(prefs, scheduledTasks); | |
59 } | |
60 | |
61 /** Gets a set of scheduled task class names. */ | |
62 public static Set<String> getScheduledTasks() { | |
63 SharedPreferences prefs = ContextUtils.getAppSharedPreferences(); | |
64 Set<String> prefsEntries = prefs.getStringSet(KEY_SCHEDULED_TASKS, new H ashSet<String>(1)); | |
nyquist
2017/04/18 21:58:28
Why do you create the set with an initial size of
fgorski
2017/04/20 05:54:15
I saw that pattern someplace in code. This is to c
| |
65 Set<String> scheduledTasksClassNames = new HashSet<>(prefsEntries.size() ); | |
66 for (String entry : prefsEntries) { | |
67 String[] entryParts = entry.split(ENTRY_SEPARATOR); | |
nyquist
2017/04/18 21:58:28
Could all of |entry| ever be null by accident?
fgorski
2017/04/20 05:54:15
That should never happen... (famous last words)
Be
| |
68 if (entryParts.length != 2 || entryParts[0] == null || entryParts[0] .isEmpty()) { | |
nyquist
2017/04/18 21:58:28
Should we verify whether entryParts[1] is a parsab
fgorski
2017/04/20 05:54:15
Ditto: https://codereview.chromium.org/2819703002/
| |
69 continue; | |
70 } | |
71 scheduledTasksClassNames.add(entryParts[0]); | |
72 } | |
73 | |
74 return scheduledTasksClassNames; | |
75 } | |
76 | |
77 private static void updateScheduledTasks(SharedPreferences prefs, Set<String > tasks) { | |
78 SharedPreferences.Editor editor = prefs.edit(); | |
79 editor.putStringSet(KEY_SCHEDULED_TASKS, tasks); | |
80 editor.apply(); | |
81 } | |
82 | |
83 /** | |
84 * Converts a task info to a shared preference entry in the format: | |
85 * BACKGROUND_TASK_CLASS_NAME:TASK_ID. | |
86 * Task ID is necessary to be able to remove the entries from the shared pre ferences. | |
87 */ | |
88 private static String toSharedPreferenceEntry(TaskInfo taskInfo) { | |
89 return taskInfo.getBackgroundTaskClass().getName() + ENTRY_SEPARATOR + t askInfo.getTaskId(); | |
90 } | |
91 } | |
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