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/*
* 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;
/**
* The CookieSyncManager is used to synchronize the browser cookie store
* between RAM and permanent storage. To get the best performance, browser cookies are
* saved in RAM. A separate thread saves the cookies between, driven by a timer.
* <p>
*
* To use the CookieSyncManager, the host application has to call the following
* when the application starts:
* <p>
*
* <pre class="prettyprint">CookieSyncManager.createInstance(context)</pre><p>
*
* To set up for sync, the host application has to call<p>
* <pre class="prettyprint">CookieSyncManager.getInstance().startSync()</pre><p>
*
* in Activity.onResume(), and call
* <p>
*
* <pre class="prettyprint">
* CookieSyncManager.getInstance().stopSync()
* </pre><p>
*
* in Activity.onPause().<p>
*
* To get instant sync instead of waiting for the timer to trigger, the host can
* call
* <p>
* <pre class="prettyprint">CookieSyncManager.getInstance().sync()</pre><p>
*
* The sync interval is 5 minutes, so you will want to force syncs
* manually anyway, for instance in {@link
* WebViewClient#onPageFinished}. Note that even sync() happens
* asynchronously, so don't do it just as your activity is shutting
* down.
*
* @deprecated The WebView now automatically syncs cookies as necessary.
* You no longer need to create or use the CookieSyncManager.
* To manually force a sync you can use the CookieManager
* method {@link CookieManager#flush} which is a synchronous
* replacement for {@link #sync}.
*/
@Deprecated
public final class CookieSyncManager extends WebSyncManager {
private static CookieSyncManager sRef;
private static boolean sGetInstanceAllowed = false;
private static final Object sLock = new Object();
private CookieSyncManager() {
super(null, null);
}
/**
* Singleton access to a {@link CookieSyncManager}. An
* IllegalStateException will be thrown if
* {@link CookieSyncManager#createInstance(Context)} is not called before.
*
* @return CookieSyncManager
*/
public static CookieSyncManager getInstance() {
synchronized (sLock) {
checkInstanceIsAllowed();
if (sRef == null) {
sRef = new CookieSyncManager();
}
return sRef;
}
}
/**
* Create a singleton CookieSyncManager within a context
* @param context
* @return CookieSyncManager
*/
public static CookieSyncManager createInstance(Context context) {
synchronized (sLock) {
if (context == null) {
throw new IllegalArgumentException("Invalid context argument");
}
setGetInstanceIsAllowed();
return getInstance();
}
}
/**
* sync() forces sync manager to sync now
* @deprecated Use {@link CookieManager#flush} instead.
*/
@Deprecated
public void sync() {
CookieManager.getInstance().flush();
}
/**
* @deprecated Use {@link CookieManager#flush} instead.
*/
@Deprecated
protected void syncFromRamToFlash() {
CookieManager.getInstance().flush();
}
/**
* resetSync() resets sync manager's timer.
* @deprecated Calling resetSync is no longer necessary as the WebView automatically
* syncs cookies.
*/
@Deprecated
public void resetSync() {
}
/**
* startSync() requests sync manager to start sync.
* @deprecated Calling startSync is no longer necessary as the WebView automatically
* syncs cookies.
*/
@Deprecated
public void startSync() {
}
/**
* stopSync() requests sync manager to stop sync. remove any SYNC_MESSAGE in
* the queue to break the sync loop
* @deprecated Calling stopSync is no longer useful as the WebView
* automatically syncs cookies.
*/
@Deprecated
public void stopSync() {
}
static void setGetInstanceIsAllowed() {
sGetInstanceAllowed = true;
}
private static void checkInstanceIsAllowed() {
// Prior to Android KK, calling createInstance() or constructing a WebView is
// a hard pre-condition for calling getInstance(). We retain that contract to aid
// developers targeting a range of SDK levels.
if (!sGetInstanceAllowed) {
throw new IllegalStateException(
"CookieSyncManager::createInstance() needs to be called "
+ "before CookieSyncManager::getInstance()");
}
}
}
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