mirror of
https://github.com/mozilla/gecko-dev.git
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151 lines
5.4 KiB
Java
151 lines
5.4 KiB
Java
/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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package org.mozilla.gecko;
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import org.mozilla.gecko.db.BrowserDB;
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import android.content.ContentResolver;
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import android.database.Cursor;
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import android.net.Uri;
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import android.os.Handler;
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import android.util.Log;
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import java.lang.ref.SoftReference;
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import java.util.HashSet;
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import java.util.LinkedList;
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import java.util.Queue;
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import java.util.Set;
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class GlobalHistory {
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private static final String LOGTAG = "GeckoGlobalHistory";
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private static GlobalHistory sInstance = new GlobalHistory();
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static GlobalHistory getInstance() {
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return sInstance;
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}
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// this is the delay between receiving a URI check request and processing it.
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// this allows batching together multiple requests and processing them together,
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// which is more efficient.
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private static final long BATCHING_DELAY_MS = 100;
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private final Handler mHandler; // a background thread on which we can process requests
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private final Queue<String> mPendingUris; // URIs that need to be checked
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private SoftReference<Set<String>> mVisitedCache; // cache of the visited URI list
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private final Runnable mNotifierRunnable; // off-thread runnable used to check URIs
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private boolean mProcessing; // = false // whether or not the runnable is queued/working
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private GlobalHistory() {
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mHandler = GeckoAppShell.getHandler();
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mPendingUris = new LinkedList<String>();
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mVisitedCache = new SoftReference<Set<String>>(null);
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mNotifierRunnable = new Runnable() {
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public void run() {
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Set<String> visitedSet = mVisitedCache.get();
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if (visitedSet == null) {
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// the cache was wiped away, repopulate it
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Log.w(LOGTAG, "Rebuilding visited link set...");
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visitedSet = new HashSet<String>();
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Cursor c = BrowserDB.getAllVisitedHistory(GeckoApp.mAppContext.getContentResolver());
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if (c.moveToFirst()) {
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do {
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visitedSet.add(c.getString(0));
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} while (c.moveToNext());
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}
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mVisitedCache = new SoftReference<Set<String>>(visitedSet);
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c.close();
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}
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// this runs on the same handler thread as the checkUriVisited code,
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// so no synchronization needed
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while (true) {
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String uri = mPendingUris.poll();
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if (uri == null) {
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break;
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}
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if (visitedSet.contains(uri)) {
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GeckoAppShell.notifyUriVisited(uri);
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}
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}
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mProcessing = false;
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}
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};
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}
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public void addToGeckoOnly(String uri) {
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Set<String> visitedSet = mVisitedCache.get();
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if (visitedSet != null) {
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visitedSet.add(uri);
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}
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GeckoAppShell.notifyUriVisited(uri);
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}
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// Logic ported from nsNavHistory::CanAddURI.
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// http://mxr.mozilla.org/mozilla-central/source/toolkit/components/places/nsNavHistory.cpp#1272
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private boolean canAddURI(String uri) {
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if (uri == null || uri.length() == 0)
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return false;
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// First, heck the most common cases (HTTP, HTTPS) to avoid most of the work.
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if (uri.startsWith("http:") || uri.startsWith("https:"))
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return true;
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String scheme = Uri.parse(uri).getScheme();
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if (scheme == null)
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return false;
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// Now check for all bad things.
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if (scheme.equals("about") ||
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scheme.equals("imap") ||
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scheme.equals("news") ||
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scheme.equals("mailbox") ||
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scheme.equals("moz-anno") ||
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scheme.equals("view-source") ||
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scheme.equals("chrome") ||
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scheme.equals("resource") ||
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scheme.equals("data") ||
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scheme.equals("wyciwyg") ||
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scheme.equals("javascript"))
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return false;
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return true;
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}
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public void add(String uri) {
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if (!canAddURI(uri))
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return;
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BrowserDB.updateVisitedHistory(GeckoApp.mAppContext.getContentResolver(), uri);
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addToGeckoOnly(uri);
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}
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public void update(String uri, String title) {
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if (!canAddURI(uri))
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return;
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ContentResolver resolver = GeckoApp.mAppContext.getContentResolver();
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BrowserDB.updateHistoryTitle(resolver, uri, title);
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}
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public void checkUriVisited(final String uri) {
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mHandler.post(new Runnable() {
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public void run() {
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// this runs on the same handler thread as the processing loop,
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// so no synchronization needed
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mPendingUris.add(uri);
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if (mProcessing) {
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// there's already a runnable queued up or working away, so
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// no need to post another
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return;
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}
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mProcessing = true;
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mHandler.postDelayed(mNotifierRunnable, BATCHING_DELAY_MS);
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}
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});
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}
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}
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