Sara Ting | 3a07a68 | 2012-10-31 13:19:38 -0700 | [diff] [blame] | 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.AlarmManager; |
| 20 | import android.app.PendingIntent; |
| 21 | import android.content.ContentResolver; |
| 22 | import android.content.ContentUris; |
| 23 | import android.content.Context; |
| 24 | import android.content.Intent; |
| 25 | import android.database.Cursor; |
| 26 | import android.net.Uri; |
| 27 | import android.provider.CalendarContract; |
| 28 | import android.provider.CalendarContract.Events; |
| 29 | import android.provider.CalendarContract.Instances; |
| 30 | import android.provider.CalendarContract.Reminders; |
| 31 | import android.text.format.DateUtils; |
| 32 | import android.text.format.Time; |
| 33 | import android.util.Log; |
| 34 | |
| 35 | import com.android.calendar.Utils; |
| 36 | |
| 37 | import java.util.ArrayList; |
| 38 | import java.util.HashMap; |
| 39 | import java.util.List; |
| 40 | import java.util.Map; |
| 41 | |
| 42 | /** |
| 43 | * Schedules the next EVENT_REMINDER_APP broadcast with AlarmManager, by querying the events |
| 44 | * and reminders tables for the next upcoming alert. |
| 45 | */ |
| 46 | public class AlarmScheduler { |
| 47 | private static final String TAG = "AlarmScheduler"; |
| 48 | |
| 49 | private static final String INSTANCES_WHERE = Events.VISIBLE + "=? AND " |
| 50 | + Instances.BEGIN + ">=? AND " + Instances.BEGIN + "<=? AND " |
| 51 | + Events.ALL_DAY + "=?"; |
| 52 | static final String[] INSTANCES_PROJECTION = new String[] { |
| 53 | Instances.EVENT_ID, |
| 54 | Instances.BEGIN, |
| 55 | Instances.ALL_DAY, |
| 56 | }; |
| 57 | private static final int INSTANCES_INDEX_EVENTID = 0; |
| 58 | private static final int INSTANCES_INDEX_BEGIN = 1; |
| 59 | private static final int INSTANCES_INDEX_ALL_DAY = 2; |
| 60 | |
| 61 | private static final String REMINDERS_WHERE = Reminders.METHOD + "=1 AND " |
| 62 | + Reminders.EVENT_ID + " IN "; |
| 63 | static final String[] REMINDERS_PROJECTION = new String[] { |
| 64 | Reminders.EVENT_ID, |
| 65 | Reminders.MINUTES, |
| 66 | Reminders.METHOD, |
| 67 | }; |
| 68 | private static final int REMINDERS_INDEX_EVENT_ID = 0; |
| 69 | private static final int REMINDERS_INDEX_MINUTES = 1; |
| 70 | private static final int REMINDERS_INDEX_METHOD = 2; |
| 71 | |
| 72 | // Add a slight delay for the EVENT_REMINDER_APP broadcast for a couple reasons: |
| 73 | // (1) so that the concurrent reminder broadcast from the provider doesn't result |
| 74 | // in a double ring, and (2) some OEMs modified the provider to not add an alert to |
| 75 | // the CalendarAlerts table until the alert time, so for the unbundled app's |
| 76 | // notifications to work on these devices, a delay ensures that AlertService won't |
| 77 | // read from the CalendarAlerts table until the alert is present. |
| 78 | static final int ALARM_DELAY_MS = 1000; |
| 79 | |
| 80 | // The reminders query looks like "SELECT ... AND eventId IN 101,102,202,...". This |
| 81 | // sets the max # of events in the query before batching into multiple queries, to |
| 82 | // limit the SQL query length. |
| 83 | private static final int REMINDER_QUERY_BATCH_SIZE = 50; |
| 84 | |
| 85 | // We really need to query for reminder times that fall in some interval, but |
| 86 | // the Reminders table only stores the reminder interval (10min, 15min, etc), and |
| 87 | // we cannot do the join with the Events table to calculate the actual alert time |
| 88 | // from outside of the provider. So the best we can do for now consider events |
| 89 | // whose start times begin within some interval (ie. 1 week out). This means |
| 90 | // reminders which are configured for more than 1 week out won't fire on time. We |
| 91 | // can minimize this to being only 1 day late by putting a 1 day max on the alarm time. |
| 92 | private static final long EVENT_LOOKAHEAD_WINDOW_MS = DateUtils.WEEK_IN_MILLIS; |
| 93 | private static final long MAX_ALARM_ELAPSED_MS = DateUtils.DAY_IN_MILLIS; |
| 94 | |
| 95 | /** |
| 96 | * Schedules the nearest upcoming alarm, to refresh notifications. |
| 97 | * |
| 98 | * This is historically done in the provider but we dupe this here so the unbundled |
| 99 | * app will work on devices that have modified this portion of the provider. This |
| 100 | * has the limitation of querying events within some interval from now (ie. looks at |
| 101 | * reminders for all events occurring in the next week). This means for example, |
| 102 | * a 2 week notification will not fire on time. |
| 103 | */ |
| 104 | public static void scheduleNextAlarm(Context context) { |
| 105 | scheduleNextAlarm(context, AlertUtils.createAlarmManager(context), |
| 106 | REMINDER_QUERY_BATCH_SIZE, System.currentTimeMillis()); |
| 107 | } |
| 108 | |
| 109 | // VisibleForTesting |
| 110 | static void scheduleNextAlarm(Context context, AlarmManagerInterface alarmManager, |
| 111 | int batchSize, long currentMillis) { |
| 112 | Cursor instancesCursor = null; |
| 113 | try { |
| 114 | instancesCursor = queryUpcomingEvents(context, context.getContentResolver(), |
| 115 | currentMillis); |
| 116 | if (instancesCursor != null) { |
| 117 | queryNextReminderAndSchedule(instancesCursor, context, |
| 118 | context.getContentResolver(), alarmManager, batchSize, currentMillis); |
| 119 | } |
| 120 | } finally { |
| 121 | if (instancesCursor != null) { |
| 122 | instancesCursor.close(); |
| 123 | } |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | /** |
| 128 | * Queries events starting within a fixed interval from now. |
| 129 | */ |
| 130 | private static Cursor queryUpcomingEvents(Context context, ContentResolver contentResolver, |
| 131 | long currentMillis) { |
| 132 | Time time = new Time(); |
| 133 | time.normalize(false); |
| 134 | long localOffset = time.gmtoff * 1000; |
| 135 | final long localStartMin = currentMillis; |
| 136 | final long localStartMax = localStartMin + EVENT_LOOKAHEAD_WINDOW_MS; |
| 137 | final long utcStartMin = localStartMin - localOffset; |
| 138 | final long utcStartMax = utcStartMin + EVENT_LOOKAHEAD_WINDOW_MS; |
| 139 | |
| 140 | // Expand Instances table range by a day on either end to account for |
| 141 | // all-day events. |
| 142 | Uri.Builder uriBuilder = Instances.CONTENT_URI.buildUpon(); |
| 143 | ContentUris.appendId(uriBuilder, localStartMin - DateUtils.DAY_IN_MILLIS); |
| 144 | ContentUris.appendId(uriBuilder, localStartMax + DateUtils.DAY_IN_MILLIS); |
| 145 | |
| 146 | // Build query for all events starting within the fixed interval. |
| 147 | StringBuilder queryBuilder = new StringBuilder(); |
| 148 | queryBuilder.append("("); |
| 149 | queryBuilder.append(INSTANCES_WHERE); |
| 150 | queryBuilder.append(") OR ("); |
| 151 | queryBuilder.append(INSTANCES_WHERE); |
| 152 | queryBuilder.append(")"); |
| 153 | String[] queryArgs = new String[] { |
| 154 | // allday selection |
| 155 | "1", /* visible = ? */ |
| 156 | String.valueOf(utcStartMin), /* begin >= ? */ |
| 157 | String.valueOf(utcStartMax), /* begin <= ? */ |
| 158 | "1", /* allDay = ? */ |
| 159 | |
| 160 | // non-allday selection |
| 161 | "1", /* visible = ? */ |
| 162 | String.valueOf(localStartMin), /* begin >= ? */ |
| 163 | String.valueOf(localStartMax), /* begin <= ? */ |
| 164 | "0" /* allDay = ? */ |
| 165 | }; |
| 166 | |
| 167 | Cursor cursor = contentResolver.query(uriBuilder.build(), INSTANCES_PROJECTION, |
| 168 | queryBuilder.toString(), queryArgs, null); |
| 169 | return cursor; |
| 170 | } |
| 171 | |
| 172 | /** |
| 173 | * Queries for all the reminders of the events in the instancesCursor, and schedules |
| 174 | * the alarm for the next upcoming reminder. |
| 175 | */ |
| 176 | private static void queryNextReminderAndSchedule(Cursor instancesCursor, Context context, |
| 177 | ContentResolver contentResolver, AlarmManagerInterface alarmManager, |
| 178 | int batchSize, long currentMillis) { |
| 179 | if (AlertService.DEBUG) { |
| 180 | int eventCount = instancesCursor.getCount(); |
| 181 | if (eventCount == 0) { |
| 182 | Log.d(TAG, "No events found starting within 1 week."); |
| 183 | } else { |
| 184 | Log.d(TAG, "Query result count for events starting within 1 week: " + eventCount); |
| 185 | } |
| 186 | } |
| 187 | |
| 188 | // Put query results of all events starting within some interval into map of event ID to |
| 189 | // local start time. |
| 190 | Map<Integer, List<Long>> eventMap = new HashMap<Integer, List<Long>>(); |
| 191 | Time timeObj = new Time(); |
| 192 | long nextAlarmTime = Long.MAX_VALUE; |
| 193 | int nextAlarmEventId = 0; |
| 194 | instancesCursor.moveToPosition(-1); |
| 195 | while (!instancesCursor.isAfterLast()) { |
| 196 | int index = 0; |
| 197 | eventMap.clear(); |
| 198 | StringBuilder eventIdsForQuery = new StringBuilder(); |
| 199 | eventIdsForQuery.append('('); |
| 200 | while (index++ < batchSize && instancesCursor.moveToNext()) { |
| 201 | int eventId = instancesCursor.getInt(INSTANCES_INDEX_EVENTID); |
| 202 | long begin = instancesCursor.getLong(INSTANCES_INDEX_BEGIN); |
| 203 | boolean allday = instancesCursor.getInt(INSTANCES_INDEX_ALL_DAY) != 0; |
| 204 | long localStartTime; |
| 205 | if (allday) { |
| 206 | // Adjust allday to local time. |
| 207 | localStartTime = Utils.convertAlldayUtcToLocal(timeObj, begin, |
| 208 | Time.getCurrentTimezone()); |
| 209 | } else { |
| 210 | localStartTime = begin; |
| 211 | } |
| 212 | List<Long> startTimes = eventMap.get(eventId); |
| 213 | if (startTimes == null) { |
| 214 | startTimes = new ArrayList<Long>(); |
| 215 | eventMap.put(eventId, startTimes); |
| 216 | eventIdsForQuery.append(eventId); |
| 217 | eventIdsForQuery.append(","); |
| 218 | } |
| 219 | startTimes.add(localStartTime); |
| 220 | |
| 221 | // Log for debugging. |
| 222 | if (Log.isLoggable(TAG, Log.DEBUG)) { |
| 223 | timeObj.set(localStartTime); |
| 224 | StringBuilder msg = new StringBuilder(); |
| 225 | msg.append("Events cursor result -- eventId:").append(eventId); |
| 226 | msg.append(", allDay:").append(allday); |
| 227 | msg.append(", start:").append(localStartTime); |
| 228 | msg.append(" (").append(timeObj.format("%a, %b %d, %Y %I:%M%P")).append(")"); |
| 229 | Log.d(TAG, msg.toString()); |
| 230 | } |
| 231 | } |
| 232 | if (eventIdsForQuery.charAt(eventIdsForQuery.length() - 1) == ',') { |
| 233 | eventIdsForQuery.deleteCharAt(eventIdsForQuery.length() - 1); |
| 234 | } |
| 235 | eventIdsForQuery.append(')'); |
| 236 | |
| 237 | // Query the reminders table for the events found. |
| 238 | Cursor cursor = null; |
| 239 | try { |
| 240 | cursor = contentResolver.query(Reminders.CONTENT_URI, REMINDERS_PROJECTION, |
| 241 | REMINDERS_WHERE + eventIdsForQuery, null, null); |
| 242 | |
| 243 | // Process the reminders query results to find the next reminder time. |
| 244 | cursor.moveToPosition(-1); |
| 245 | while (cursor.moveToNext()) { |
| 246 | int eventId = cursor.getInt(REMINDERS_INDEX_EVENT_ID); |
| 247 | int reminderMinutes = cursor.getInt(REMINDERS_INDEX_MINUTES); |
| 248 | List<Long> startTimes = eventMap.get(eventId); |
| 249 | if (startTimes != null) { |
| 250 | for (Long startTime : startTimes) { |
| 251 | long alarmTime = startTime - |
| 252 | reminderMinutes * DateUtils.MINUTE_IN_MILLIS; |
| 253 | if (alarmTime > currentMillis && alarmTime < nextAlarmTime) { |
| 254 | nextAlarmTime = alarmTime; |
| 255 | nextAlarmEventId = eventId; |
| 256 | } |
| 257 | |
| 258 | if (Log.isLoggable(TAG, Log.DEBUG)) { |
| 259 | timeObj.set(alarmTime); |
| 260 | StringBuilder msg = new StringBuilder(); |
| 261 | msg.append("Reminders cursor result -- eventId:").append(eventId); |
| 262 | msg.append(", startTime:").append(startTime); |
| 263 | msg.append(", minutes:").append(reminderMinutes); |
| 264 | msg.append(", alarmTime:").append(alarmTime); |
| 265 | msg.append(" (").append(timeObj.format("%a, %b %d, %Y %I:%M%P")) |
| 266 | .append(")"); |
| 267 | Log.d(TAG, msg.toString()); |
| 268 | } |
| 269 | } |
| 270 | } |
| 271 | } |
| 272 | } finally { |
| 273 | if (cursor != null) { |
| 274 | cursor.close(); |
| 275 | } |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | // Schedule the alarm for the next reminder time. |
| 280 | if (nextAlarmTime < Long.MAX_VALUE) { |
| 281 | scheduleAlarm(context, nextAlarmEventId, nextAlarmTime, currentMillis, alarmManager); |
| 282 | } |
| 283 | } |
| 284 | |
| 285 | /** |
| 286 | * Schedules an alarm for the EVENT_REMINDER_APP broadcast, for the specified |
| 287 | * alarm time with a slight delay (to account for the possible duplicate broadcast |
| 288 | * from the provider). |
| 289 | */ |
| 290 | private static void scheduleAlarm(Context context, long eventId, long alarmTime, |
| 291 | long currentMillis, AlarmManagerInterface alarmManager) { |
| 292 | // Max out the alarm time to 1 day out, so an alert for an event far in the future |
| 293 | // (not present in our event query results for a limited range) can only be at |
| 294 | // most 1 day late. |
| 295 | long maxAlarmTime = currentMillis + MAX_ALARM_ELAPSED_MS; |
| 296 | if (alarmTime > maxAlarmTime) { |
| 297 | alarmTime = maxAlarmTime; |
| 298 | } |
| 299 | |
| 300 | // Add a slight delay (see comments on the member var). |
| 301 | alarmTime += ALARM_DELAY_MS; |
| 302 | |
| 303 | if (AlertService.DEBUG) { |
| 304 | Time time = new Time(); |
| 305 | time.set(alarmTime); |
| 306 | String schedTime = time.format("%a, %b %d, %Y %I:%M%P"); |
| 307 | Log.d(TAG, "Scheduling alarm for EVENT_REMINDER_APP broadcast for event " + eventId |
| 308 | + " at " + alarmTime + " (" + schedTime + ")"); |
| 309 | } |
| 310 | |
| 311 | // Schedule an EVENT_REMINDER_APP broadcast with AlarmManager. The extra is |
| 312 | // only used by AlertService for logging. It is ignored by Intent.filterEquals, |
| 313 | // so this scheduling will still overwrite the alarm that was previously pending. |
| 314 | // Note that the 'setClass' is required, because otherwise it seems the broadcast |
| 315 | // can be eaten by other apps and we somehow may never receive it. |
| 316 | Intent intent = new Intent(AlertReceiver.EVENT_REMINDER_APP_ACTION); |
| 317 | intent.setClass(context, AlertReceiver.class); |
| 318 | intent.putExtra(CalendarContract.CalendarAlerts.ALARM_TIME, alarmTime); |
| 319 | PendingIntent pi = PendingIntent.getBroadcast(context, 0, intent, 0); |
| 320 | alarmManager.set(AlarmManager.RTC_WAKEUP, alarmTime, pi); |
| 321 | } |
| 322 | } |