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/*
* 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.content.SharedPreferences;
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.File;
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 String RECOVERY_PREFERENCES = "browser_recovery_prefs";
private static final String KEY_LAST_RECOVERED = "last_recovered";
private static final int BUFFER_SIZE = 4096;
private static final long BACKUP_DELAY = 500; // 500ms between writes
/* This is the duration for which we will prompt to restore
* instead of automatically restoring. The first time the browser crashes,
* we will automatically restore. If we then crash again within XX minutes,
* we will prompt instead of automatically restoring.
*/
private static final long PROMPT_INTERVAL = 30 * 60 * 1000; // 30 minutes
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);
File state = new File(mContext.getCacheDir(), STATE_FILE);
FileOutputStream fout = new FileOutputStream(state);
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) {
File state = new File(context.getCacheDir(), STATE_FILE);
if (state.exists()) {
state.delete();
}
}
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) {
updateLastRecovered();
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();
}
private boolean shouldPrompt() {
// STOPSHIP TODO: Remove once b/4971724 is fixed
if (true) return false;
Context context = mController.getActivity();
SharedPreferences prefs = context.getSharedPreferences(
RECOVERY_PREFERENCES, Context.MODE_PRIVATE);
long lastRecovered = prefs.getLong(KEY_LAST_RECOVERED,
System.currentTimeMillis());
long timeSinceLastRecover = System.currentTimeMillis() - lastRecovered;
if (timeSinceLastRecover > PROMPT_INTERVAL) {
return false;
}
return true;
}
private void updateLastRecovered() {
Context context = mController.getActivity();
SharedPreferences prefs = context.getSharedPreferences(
RECOVERY_PREFERENCES, Context.MODE_PRIVATE);
prefs.edit()
.putLong(KEY_LAST_RECOVERED, System.currentTimeMillis())
.commit();
}
public void startRecovery(Intent intent) {
Bundle state = null;
Parcel parcel = Parcel.obtain();
try {
Context context = mController.getActivity();
File stateFile = new File(context.getCacheDir(), STATE_FILE);
FileInputStream fin = new FileInputStream(stateFile);
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);
state = parcel.readBundle();
if (shouldPrompt()) {
promptToRecover(state, intent);
return;
} else {
updateLastRecovered();
}
} catch (FileNotFoundException e) {
// No state to recover
state = null;
} catch (Exception e) {
Log.w(LOGTAG, "Failed to recover state!", e);
state = null;
} finally {
parcel.recycle();
}
mController.doStart(state, intent);
}
}
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