gecko/mobile/android/base/GlobalHistory.java

183 lines
6.9 KiB
Java

/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Android code.
*
* The Initial Developer of the Original Code is Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2011
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Kartikaya Gupta <kgupta@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
package org.mozilla.gecko;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Queue;
import java.util.Set;
import java.lang.ref.SoftReference;
import android.content.ContentResolver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Handler;
import android.util.Log;
import org.mozilla.gecko.db.BrowserDB;
class GlobalHistory {
private static final String LOGTAG = "GeckoGlobalHistory";
private static GlobalHistory sInstance = new GlobalHistory();
static GlobalHistory getInstance() {
return sInstance;
}
// this is the delay between receiving a URI check request and processing it.
// this allows batching together multiple requests and processing them together,
// which is more efficient.
private static final long BATCHING_DELAY_MS = 100;
private final Handler mHandler; // a background thread on which we can process requests
private final Queue<String> mPendingUris; // URIs that need to be checked
private SoftReference<Set<String>> mVisitedCache; // cache of the visited URI list
private final Runnable mNotifierRunnable; // off-thread runnable used to check URIs
private boolean mProcessing; // = false // whether or not the runnable is queued/working
private GlobalHistory() {
mHandler = GeckoAppShell.getHandler();
mPendingUris = new LinkedList<String>();
mVisitedCache = new SoftReference<Set<String>>(null);
mNotifierRunnable = new Runnable() {
public void run() {
Set<String> visitedSet = mVisitedCache.get();
if (visitedSet == null) {
// the cache was wiped away, repopulate it
Log.w(LOGTAG, "Rebuilding visited link set...");
visitedSet = new HashSet<String>();
Cursor c = BrowserDB.getAllVisitedHistory(GeckoApp.mAppContext.getContentResolver());
if (c.moveToFirst()) {
do {
visitedSet.add(c.getString(0));
} while (c.moveToNext());
}
mVisitedCache = new SoftReference<Set<String>>(visitedSet);
c.close();
}
// this runs on the same handler thread as the checkUriVisited code,
// so no synchronization needed
while (true) {
String uri = mPendingUris.poll();
if (uri == null) {
break;
}
if (visitedSet.contains(uri)) {
GeckoAppShell.notifyUriVisited(uri);
}
}
mProcessing = false;
}
};
}
public void addToGeckoOnly(String uri) {
Set<String> visitedSet = mVisitedCache.get();
if (visitedSet != null) {
visitedSet.add(uri);
}
GeckoAppShell.notifyUriVisited(uri);
}
// Logic ported from nsNavHistory::CanAddURI.
// http://mxr.mozilla.org/mozilla-central/source/toolkit/components/places/nsNavHistory.cpp#1272
private boolean canAddURI(String uri) {
if (uri == null || uri.length() == 0)
return false;
// First, heck the most common cases (HTTP, HTTPS) to avoid most of the work.
if (uri.startsWith("http:") || uri.startsWith("https:"))
return true;
String scheme = Uri.parse(uri).getScheme();
if (scheme == null)
return false;
// Now check for all bad things.
if (scheme.equals("about") ||
scheme.equals("imap") ||
scheme.equals("news") ||
scheme.equals("mailbox") ||
scheme.equals("moz-anno") ||
scheme.equals("view-source") ||
scheme.equals("chrome") ||
scheme.equals("resource") ||
scheme.equals("data") ||
scheme.equals("wyciwyg") ||
scheme.equals("javascript"))
return false;
return true;
}
public void add(String uri) {
if (!canAddURI(uri))
return;
BrowserDB.updateVisitedHistory(GeckoApp.mAppContext.getContentResolver(), uri);
addToGeckoOnly(uri);
}
public void update(String uri, String title) {
if (!canAddURI(uri))
return;
ContentResolver resolver = GeckoApp.mAppContext.getContentResolver();
BrowserDB.updateHistoryTitle(resolver, uri, title);
}
public void checkUriVisited(final String uri) {
mHandler.post(new Runnable() {
public void run() {
// this runs on the same handler thread as the processing loop,
// so no synchronization needed
mPendingUris.add(uri);
if (mProcessing) {
// there's already a runnable queued up or working away, so
// no need to post another
return;
}
mProcessing = true;
mHandler.postDelayed(mNotifierRunnable, BATCHING_DELAY_MS);
}
});
}
}