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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.android_webview; | |
6 | |
7 import android.annotation.SuppressLint; | |
8 import android.app.job.JobParameters; | |
9 import android.app.job.JobService; | |
10 import android.os.AsyncTask; | |
11 | |
12 import org.chromium.base.ContextUtils; | |
13 import org.chromium.base.Log; | |
14 import org.chromium.base.ThreadUtils; | |
15 import org.chromium.components.variations.firstrun.VariationsSeedFetcher; | |
16 import org.chromium.components.variations.firstrun.VariationsSeedFetcher.SeedInf o; | |
17 | |
18 import java.io.Closeable; | |
19 import java.io.File; | |
20 import java.io.FileNotFoundException; | |
21 import java.io.FileOutputStream; | |
22 import java.io.IOException; | |
23 import java.io.ObjectOutputStream; | |
24 import java.io.Serializable; | |
25 import java.util.concurrent.locks.Lock; | |
26 import java.util.concurrent.locks.ReentrantLock; | |
27 | |
28 /** | |
29 * AwVariationsSeedFetchService is a Job Service to fetch test seed data which i s used by Finch | |
30 * to enable AB testing experiments in the native code. The fetched data is stor ed in the local | |
31 * directory which belongs to the Service process. | |
32 */ | |
33 @SuppressLint("NewApi") // JobService requires API level 21. | |
34 public class AwVariationsSeedFetchService extends JobService { | |
35 private static final String TAG = "AwVartnsSeedFetchSvc"; | |
36 | |
37 public static final String WEBVIEW_VARIATIONS_DIR = "WebView_Variations/"; | |
38 public static final String SEED_DATA_FILENAME = "variations_seed_data"; | |
39 public static final String SEED_PREF_FILENAME = "variations_seed_pref"; | |
40 | |
41 // Synchronization lock to prevent simultaneous local seed file writing. | |
42 private static final Lock sLock = new ReentrantLock(); | |
43 | |
44 @Override | |
45 public boolean onStartJob(JobParameters params) { | |
46 new FetchFinchSeedDataTask(params).execute(); | |
47 return true; | |
48 } | |
49 | |
50 @Override | |
51 public boolean onStopJob(JobParameters params) { | |
52 // When job parameter is not satisfied any more, the job should be resch eduled. | |
53 return true; | |
54 } | |
55 | |
56 private class FetchFinchSeedDataTask extends AsyncTask<Void, Void, Void> { | |
57 private JobParameters mJobParams; | |
58 | |
59 FetchFinchSeedDataTask(JobParameters params) { | |
60 mJobParams = params; | |
61 } | |
62 | |
63 @Override | |
64 protected Void doInBackground(Void... params) { | |
65 AwVariationsSeedFetchService.fetchSeed(); | |
66 return null; | |
67 } | |
68 | |
69 @Override | |
70 protected void onPostExecute(Void success) { | |
71 jobFinished(mJobParams, false); | |
72 } | |
73 } | |
74 | |
75 private static void fetchSeed() { | |
76 assert !ThreadUtils.runningOnUiThread(); | |
77 // TryLock will drop calls from other threads when one threads are execu ting the function. | |
78 // TODO(yiyuny): Add explicitly control to to ensure there's only one th reading fetching at | |
79 // a time and that the seed doesn't get fetched too frequently | |
80 if (sLock.tryLock()) { | |
81 try { | |
82 SeedInfo seedInfo = VariationsSeedFetcher.get().downloadContent( | |
83 VariationsSeedFetcher.VariationsPlatform.ANDROID_WEBVIEW , ""); | |
84 storeVariationsSeed(seedInfo); | |
85 } catch (IOException e) { | |
86 // Exceptions are handled in the downloadContent function and re throwing the | |
87 // exception is to stop the normal logic flow after it, so no er ror-handling here. | |
88 // Not explicitly handing SocketTimeoutException and UnknownHost Exception for they | |
89 // are both subclasses of IOException. | |
90 } finally { | |
91 sLock.unlock(); | |
92 } | |
93 } | |
94 } | |
95 | |
96 /** | |
97 * SeedPreference serialize related fields of seed data and is used when rea ding or writing | |
Alexei Svitkine (slow)
2017/07/12 19:01:21
Nit: "serializes" or "is used to serialize"
yiyuny
2017/07/12 22:22:05
Done.
| |
98 * the fields to the internal storage. serialVersionUID can let the program deserialize the data | |
99 * when the fields are changed. | |
Alexei Svitkine (slow)
2017/07/12 19:01:21
Nit: Move the last sentence to be about serialVers
yiyuny
2017/07/12 22:22:06
Done.
| |
100 */ | |
101 public static class SeedPreference implements Serializable { | |
102 private static final long serialVersionUID = 0L; | |
Alexei Svitkine (slow)
2017/07/12 19:01:21
Nit: Add an empty line after this.
yiyuny
2017/07/12 22:22:05
Done.
| |
103 public final String signature; | |
104 public final String country; | |
105 public final String date; | |
106 public final boolean isGzipCompressed; | |
107 | |
108 public SeedPreference(SeedInfo seedInfo) { | |
109 signature = seedInfo.signature; | |
110 country = seedInfo.country; | |
111 date = seedInfo.date; | |
112 isGzipCompressed = seedInfo.isGzipCompressed; | |
113 } | |
114 } | |
115 | |
116 private static File getOrCreateWebViewVariationsDir() { | |
117 File webViewFileDir = ContextUtils.getApplicationContext().getFilesDir() ; | |
118 File dir = new File(webViewFileDir, WEBVIEW_VARIATIONS_DIR); | |
119 if (dir.mkdir() || dir.isDirectory()) { | |
120 return dir; | |
121 } | |
122 return null; | |
123 } | |
124 | |
125 private static void storeVariationsSeed(SeedInfo seedInfo) { | |
126 File webViewVariationsDir = getOrCreateWebViewVariationsDir(); | |
127 if (webViewVariationsDir == null) { | |
128 return; | |
129 } | |
130 | |
131 FileOutputStream fosSeed = null; | |
132 ObjectOutputStream oosSeedPref = null; | |
133 try { | |
134 fosSeed = new FileOutputStream(new File(webViewVariationsDir, SEED_D ATA_FILENAME)); | |
135 fosSeed.write(seedInfo.seedData, 0, seedInfo.seedData.length); | |
Alexei Svitkine (slow)
2017/07/12 19:01:21
How will you read this?
I think you need to also
yiyuny
2017/07/12 22:22:06
I choose to store the seed data and preference sep
Alexei Svitkine (slow)
2017/07/13 20:36:25
Ah, sorry I had missed that you're writing to diff
| |
136 // Store separately so that reading large seed data (which is expens ive) can be | |
137 // prevented when checking the last seed fetch time. | |
138 oosSeedPref = new ObjectOutputStream( | |
139 new FileOutputStream(new File(webViewVariationsDir, SEED_PRE F_FILENAME))); | |
140 oosSeedPref.writeObject(new SeedPreference(seedInfo)); | |
141 } catch (FileNotFoundException e) { | |
142 Log.e(TAG, | |
143 "FileNotFoundException failed to open file to write seed dat a or preference."); | |
Alexei Svitkine (slow)
2017/07/12 19:01:21
Nit: If you pass e as a last param, you don't need
paulmiller
2017/07/12 20:21:59
I recommended not passing e, because I thought a s
Alexei Svitkine (slow)
2017/07/12 20:32:31
Ah, fair enough. Maybe log e.getMessage() then, at
yiyuny
2017/07/12 22:22:06
I don't know the default value of the Exception's
| |
144 } catch (IOException e) { | |
145 Log.e(TAG, | |
146 "IOException failed to write variations seed data or prefere nce to the file."); | |
147 } finally { | |
148 closeStream(fosSeed, SEED_DATA_FILENAME); | |
149 closeStream(oosSeedPref, SEED_PREF_FILENAME); | |
150 } | |
151 } | |
152 | |
153 private static void closeStream(Closeable stream, String filename) { | |
154 if (stream != null) { | |
155 try { | |
156 stream.close(); | |
157 } catch (IOException e) { | |
158 Log.e(TAG, "IOException failed to close " + filename + " file.") ; | |
159 } | |
160 } | |
161 } | |
162 } | |
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