1/*
2 * Copyright (C) 2010 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
17package com.android.providers.calendar;
18
19import android.app.ActivityManagerNative;
20import android.content.BroadcastReceiver;
21import android.content.ComponentName;
22import android.content.Context;
23import android.content.Intent;
24import android.content.SharedPreferences;
25import android.content.pm.PackageManager;
26import android.os.RemoteException;
27import android.util.EventLog;
28import android.util.Log;
29
30/**
31 * This will be launched during system boot, after the core system has
32 * been brought up but before any non-persistent processes have been
33 * started.  It is launched in a special state, with no content provider
34 * or custom application class associated with the process running.
35 *
36 * It's job is to prime the calendar database. Either create it
37 * if it doesn't exist, or open it and force any necessary upgrades.
38 * All of this heavy lifting happens before the boot animation ends.
39 */
40public class CalendarUpgradeReceiver extends BroadcastReceiver {
41    static final String TAG = "CalendarUpgradeReceiver";
42    static final String PREF_DB_VERSION = "db_version";
43
44    @Override
45    public void onReceive(Context context, Intent intent) {
46        // We are now running with the system up, but no apps started,
47        // so can do whatever cleanup after an upgrade that we want.
48
49        try {
50            long startTime = System.currentTimeMillis();
51
52            // Lookup the last known database version
53            SharedPreferences prefs = context.getSharedPreferences(TAG, Context.MODE_PRIVATE);
54            int prefVersion = prefs.getInt(PREF_DB_VERSION, 0);
55
56            // If the version is old go ahead and attempt to create or upgrade the database.
57            if (prefVersion != CalendarDatabaseHelper.DATABASE_VERSION) {
58                // Store the current version so this receiver isn't run again until the database
59                // version number changes. This is intentionally done even before the upgrade path
60                // is attempted to be conservative. If the upgrade fails for some reason and we
61                // crash and burn we don't want to get into a loop doing so.
62                prefs.edit().putInt(PREF_DB_VERSION, CalendarDatabaseHelper.DATABASE_VERSION).commit();
63
64                // Ask for a reference to the database to force the helper to either
65                // create the database or open it up, performing any necessary upgrades
66                // in the process.
67                CalendarDatabaseHelper helper = CalendarDatabaseHelper.getInstance(context);
68                if (context.getDatabasePath(helper.getDatabaseName()).exists()) {
69                    Log.i(TAG, "Creating or opening calendar database");
70                    try {
71                        ActivityManagerNative.getDefault().showBootMessage(
72                                context.getText(R.string.upgrade_msg), true);
73                    } catch (RemoteException e) {
74                    }
75                    helper.getWritableDatabase();
76                }
77                helper.close();
78
79                // Log the total time taken for the receiver to perform the operation
80                EventLogTags.writeCalendarUpgradeReceiver(System.currentTimeMillis() - startTime);
81            }
82        } catch (Throwable t) {
83            // Something has gone terribly wrong. Disable this receiver for good so we can't
84            // possibly end up in a reboot loop.
85            Log.wtf(TAG, "Error during upgrade attempt. Disabling receiver.", t);
86            context.getPackageManager().setComponentEnabledSetting(
87                    new ComponentName(context, getClass()),
88                    PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
89                    PackageManager.DONT_KILL_APP);
90        }
91    }
92}
93