1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
/*
* Copyright (C) 2011 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.browser;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnCancelListener;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Parcel;
import android.os.Process;
import android.util.Log;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
public class CrashRecoveryHandler {
private static final String LOGTAG = "BrowserCrashRecovery";
private static final String STATE_FILE = "browser_state.parcel";
private static final int BUFFER_SIZE = 4096;
private static final long BACKUP_DELAY = 500; // 500ms between writes
private static CrashRecoveryHandler sInstance;
private Controller mController;
private Handler mForegroundHandler;
private Handler mBackgroundHandler;
public static CrashRecoveryHandler initialize(Controller controller) {
if (sInstance == null) {
sInstance = new CrashRecoveryHandler(controller);
} else {
sInstance.mController = controller;
}
return sInstance;
}
public static CrashRecoveryHandler getInstance() {
return sInstance;
}
private CrashRecoveryHandler(Controller controller) {
mController = controller;
mForegroundHandler = new Handler();
HandlerThread thread = new HandlerThread(LOGTAG,
Process.THREAD_PRIORITY_BACKGROUND);
thread.start();
mBackgroundHandler = new Handler(thread.getLooper());
}
public void backupState() {
mForegroundHandler.postDelayed(mCreateState, BACKUP_DELAY);
}
private Runnable mCreateState = new Runnable() {
@Override
public void run() {
try {
final Bundle state = new Bundle();
mController.onSaveInstanceState(state, false);
Context context = mController.getActivity()
.getApplicationContext();
mBackgroundHandler.post(new WriteState(context, state));
// Remove any queued up saves
mForegroundHandler.removeCallbacks(mCreateState);
} catch (Throwable t) {
Log.w(LOGTAG, "Failed to save state", t);
return;
}
}
};
static class WriteState implements Runnable {
private Context mContext;
private Bundle mState;
WriteState(Context context, Bundle state) {
mContext = context;
mState = state;
}
@Override
public void run() {
if (mState.isEmpty()) {
clearState(mContext);
return;
}
Parcel p = Parcel.obtain();
try {
mState.writeToParcel(p, 0);
FileOutputStream fout = mContext.openFileOutput(STATE_FILE,
Context.MODE_PRIVATE);
fout.write(p.marshall());
fout.close();
} catch (Throwable e) {
Log.i(LOGTAG, "Failed to save persistent state", e);
} finally {
p.recycle();
}
}
}
private static void clearState(Context context) {
context.deleteFile(STATE_FILE);
}
public void promptToRecover(final Bundle state, final Intent intent) {
new AlertDialog.Builder(mController.getActivity())
.setTitle(R.string.recover_title)
.setMessage(R.string.recover_prompt)
.setIcon(R.mipmap.ic_launcher_browser)
.setPositiveButton(R.string.recover_yes, new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
mController.doStart(state, intent);
}
})
.setNegativeButton(R.string.recover_no, new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
})
.setOnCancelListener(new OnCancelListener() {
@Override
public void onCancel(DialogInterface dialog) {
clearState(mController.getActivity());
mController.doStart(null, intent);
}
})
.show();
}
public void startRecovery(Intent intent) {
Parcel parcel = Parcel.obtain();
try {
Context context = mController.getActivity();
FileInputStream fin = context.openFileInput(STATE_FILE);
ByteArrayOutputStream dataStream = new ByteArrayOutputStream();
byte[] buffer = new byte[BUFFER_SIZE];
int read;
while ((read = fin.read(buffer)) > 0) {
dataStream.write(buffer, 0, read);
}
byte[] data = dataStream.toByteArray();
parcel.unmarshall(data, 0, data.length);
parcel.setDataPosition(0);
Bundle state = parcel.readBundle();
promptToRecover(state, intent);
} catch (FileNotFoundException e) {
// No state to recover
mController.doStart(null, intent);
} catch (Exception e) {
Log.w(LOGTAG, "Failed to recover state!", e);
mController.doStart(null, intent);
} finally {
parcel.recycle();
}
}
}
|
