| /* |
| * Copyright (C) 2007 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 android.webkit; |
| |
| import android.content.Context; |
| import android.os.Handler; |
| import android.os.Looper; |
| import android.os.Message; |
| import android.os.Process; |
| import android.util.Log; |
| |
| abstract class WebSyncManager implements Runnable { |
| // message code for sync message |
| private static final int SYNC_MESSAGE = 101; |
| // time delay in millisec for a sync (now) message |
| private static int SYNC_NOW_INTERVAL = 100; // 100 millisec |
| // time delay in millisec for a sync (later) message |
| private static int SYNC_LATER_INTERVAL = 5 * 60 * 1000; // 5 minutes |
| // thread for syncing |
| private Thread mSyncThread; |
| // Name of thread |
| private String mThreadName; |
| // handler of the sync thread |
| protected Handler mHandler; |
| // database for the persistent storage. Always null. |
| protected WebViewDatabase mDataBase; |
| // Ref count for calls to start/stop sync |
| private int mStartSyncRefCount; |
| // log tag |
| protected static final String LOGTAG = "websync"; |
| |
| private class SyncHandler extends Handler { |
| @Override |
| public void handleMessage(Message msg) { |
| if (msg.what == SYNC_MESSAGE) { |
| if (DebugFlags.WEB_SYNC_MANAGER) { |
| Log.v(LOGTAG, "*** WebSyncManager sync ***"); |
| } |
| syncFromRamToFlash(); |
| |
| // send a delayed message to request sync later |
| Message newmsg = obtainMessage(SYNC_MESSAGE); |
| sendMessageDelayed(newmsg, SYNC_LATER_INTERVAL); |
| } |
| } |
| } |
| |
| protected WebSyncManager(Context context, String name) { |
| this(name); |
| } |
| |
| /** @hide */ |
| WebSyncManager(String name) { |
| mThreadName = name; |
| mSyncThread = new Thread(this); |
| mSyncThread.setName(mThreadName); |
| mSyncThread.start(); |
| } |
| |
| protected Object clone() throws CloneNotSupportedException { |
| throw new CloneNotSupportedException("doesn't implement Cloneable"); |
| } |
| |
| public void run() { |
| // prepare Looper for sync handler |
| Looper.prepare(); |
| mHandler = new SyncHandler(); |
| onSyncInit(); |
| // lower the priority after onSyncInit() is done |
| Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND); |
| |
| Message msg = mHandler.obtainMessage(SYNC_MESSAGE); |
| mHandler.sendMessageDelayed(msg, SYNC_LATER_INTERVAL); |
| |
| Looper.loop(); |
| } |
| |
| /** |
| * sync() forces sync manager to sync now |
| */ |
| public void sync() { |
| if (DebugFlags.WEB_SYNC_MANAGER) { |
| Log.v(LOGTAG, "*** WebSyncManager sync ***"); |
| } |
| if (mHandler == null) { |
| return; |
| } |
| mHandler.removeMessages(SYNC_MESSAGE); |
| Message msg = mHandler.obtainMessage(SYNC_MESSAGE); |
| mHandler.sendMessageDelayed(msg, SYNC_NOW_INTERVAL); |
| } |
| |
| /** |
| * resetSync() resets sync manager's timer |
| */ |
| public void resetSync() { |
| if (DebugFlags.WEB_SYNC_MANAGER) { |
| Log.v(LOGTAG, "*** WebSyncManager resetSync ***"); |
| } |
| if (mHandler == null) { |
| return; |
| } |
| mHandler.removeMessages(SYNC_MESSAGE); |
| Message msg = mHandler.obtainMessage(SYNC_MESSAGE); |
| mHandler.sendMessageDelayed(msg, SYNC_LATER_INTERVAL); |
| } |
| |
| /** |
| * startSync() requests sync manager to start sync |
| */ |
| public void startSync() { |
| if (DebugFlags.WEB_SYNC_MANAGER) { |
| Log.v(LOGTAG, "*** WebSyncManager startSync ***, Ref count:" + |
| mStartSyncRefCount); |
| } |
| if (mHandler == null) { |
| return; |
| } |
| if (++mStartSyncRefCount == 1) { |
| Message msg = mHandler.obtainMessage(SYNC_MESSAGE); |
| mHandler.sendMessageDelayed(msg, SYNC_LATER_INTERVAL); |
| } |
| } |
| |
| /** |
| * stopSync() requests sync manager to stop sync. remove any SYNC_MESSAGE in |
| * the queue to break the sync loop |
| */ |
| public void stopSync() { |
| if (DebugFlags.WEB_SYNC_MANAGER) { |
| Log.v(LOGTAG, "*** WebSyncManager stopSync ***, Ref count:" + |
| mStartSyncRefCount); |
| } |
| if (mHandler == null) { |
| return; |
| } |
| if (--mStartSyncRefCount == 0) { |
| mHandler.removeMessages(SYNC_MESSAGE); |
| } |
| } |
| |
| protected void onSyncInit() { |
| } |
| |
| abstract void syncFromRamToFlash(); |
| } |