| /* |
| * Copyright (C) 2008-2009 Marc Blank |
| * Licensed to 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.exchange; |
| |
| import android.content.BroadcastReceiver; |
| import android.content.ContentResolver; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.database.Cursor; |
| import android.util.Log; |
| |
| import com.android.emailcommon.provider.EmailContent.Message; |
| import com.android.emailcommon.provider.EmailContent.MessageColumns; |
| import com.android.emailcommon.provider.ProviderUnavailableException; |
| |
| import java.util.ArrayList; |
| |
| /** |
| * EmailSyncAlarmReceiver (USAR) is used by the SyncManager to start up-syncs of user-modified data |
| * back to the Exchange server. |
| * |
| * Here's how this works for Email, for example: |
| * |
| * 1) User modifies or deletes an email from the UI. |
| * 2) SyncManager, which has a ContentObserver watching the Message class, is alerted to a change |
| * 3) SyncManager sets an alarm (to be received by USAR) for a few seconds in the |
| * future (currently 15), the delay preventing excess syncing (think of it as a debounce mechanism). |
| * 4) ESAR Receiver's onReceive method is called |
| * 5) ESAR goes through all change and deletion records and compiles a list of mailboxes which have |
| * changes to be uploaded. |
| * 6) ESAR calls SyncManager to start syncs of those mailboxes |
| * |
| * If EmailProvider isn't available, the upsyncs will happen the next time ExchangeService starts |
| * |
| */ |
| public class EmailSyncAlarmReceiver extends BroadcastReceiver { |
| final String[] MAILBOX_DATA_PROJECTION = {MessageColumns.MAILBOX_KEY}; |
| |
| @Override |
| public void onReceive(final Context context, Intent intent) { |
| new Thread(new Runnable() { |
| public void run() { |
| handleReceive(context); |
| } |
| }).start(); |
| } |
| |
| private void handleReceive(Context context) { |
| ArrayList<Long> mailboxesToNotify = new ArrayList<Long>(); |
| ContentResolver cr = context.getContentResolver(); |
| int messageCount = 0; |
| |
| // Get a selector for EAS accounts (we don't want to sync on changes to POP/IMAP messages) |
| String selector = ExchangeService.getEasAccountSelector(); |
| |
| try { |
| // Find all of the deletions |
| Cursor c = cr.query(Message.DELETED_CONTENT_URI, MAILBOX_DATA_PROJECTION, selector, |
| null, null); |
| if (c == null) throw new ProviderUnavailableException(); |
| try { |
| // Keep track of which mailboxes to notify; we'll only notify each one once |
| while (c.moveToNext()) { |
| messageCount++; |
| long mailboxId = c.getLong(0); |
| if (!mailboxesToNotify.contains(mailboxId)) { |
| mailboxesToNotify.add(mailboxId); |
| } |
| } |
| } finally { |
| c.close(); |
| } |
| |
| // Now, find changed messages |
| c = cr.query(Message.UPDATED_CONTENT_URI, MAILBOX_DATA_PROJECTION, selector, |
| null, null); |
| if (c == null) throw new ProviderUnavailableException(); |
| try { |
| // Keep track of which mailboxes to notify; we'll only notify each one once |
| while (c.moveToNext()) { |
| messageCount++; |
| long mailboxId = c.getLong(0); |
| if (!mailboxesToNotify.contains(mailboxId)) { |
| mailboxesToNotify.add(mailboxId); |
| } |
| } |
| } finally { |
| c.close(); |
| } |
| |
| // Request service from the mailbox |
| for (Long mailboxId: mailboxesToNotify) { |
| ExchangeService.serviceRequest(mailboxId, ExchangeService.SYNC_UPSYNC); |
| } |
| } catch (ProviderUnavailableException e) { |
| Log.e("EmailSyncAlarmReceiver", "EmailProvider unavailable; aborting alarm receiver"); |
| } |
| } |
| } |