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      1 /*
      2  * Copyright (C) 2012 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 
     17 package com.android.calendar.alerts;
     18 
     19 import android.app.IntentService;
     20 import android.content.ContentValues;
     21 import android.content.Intent;
     22 import android.net.Uri;
     23 import android.os.SystemClock;
     24 import android.provider.CalendarContract;
     25 import android.util.Log;
     26 
     27 /**
     28  * Service for clearing all scheduled alerts from the CalendarAlerts table and
     29  * rescheduling them.  This is expected to be called only on boot up, to restore
     30  * the AlarmManager alarms that were lost on device restart.
     31  */
     32 public class InitAlarmsService extends IntentService {
     33     private static final String TAG = "InitAlarmsService";
     34     private static final String SCHEDULE_ALARM_REMOVE_PATH = "schedule_alarms_remove";
     35     private static final Uri SCHEDULE_ALARM_REMOVE_URI = Uri.withAppendedPath(
     36             CalendarContract.CONTENT_URI, SCHEDULE_ALARM_REMOVE_PATH);
     37 
     38     // Delay for rescheduling the alarms must be great enough to minimize race
     39     // conditions with the provider's boot up actions.
     40     private static final long DELAY_MS = 30000;
     41 
     42     public InitAlarmsService() {
     43         super("InitAlarmsService");
     44     }
     45 
     46     @Override
     47     protected void onHandleIntent(Intent intent) {
     48         // Delay to avoid race condition of in-progress alarm scheduling in provider.
     49         SystemClock.sleep(DELAY_MS);
     50         Log.d(TAG, "Clearing and rescheduling alarms.");
     51         try {
     52             getContentResolver().update(SCHEDULE_ALARM_REMOVE_URI, new ContentValues(), null,
     53                     null);
     54         } catch (java.lang.IllegalArgumentException e) {
     55             // java.lang.IllegalArgumentException:
     56             //     Unknown URI content://com.android.calendar/schedule_alarms_remove
     57 
     58             // Until b/7742576 is resolved, just catch the exception so the app won't crash
     59             Log.e(TAG, "update failed: " + e.toString());
     60         }
     61     }
     62 }
     63