gecko/mobile/android/base/GlobalHistory.java

140 lines
5.6 KiB
Java

/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko;
import java.lang.ref.SoftReference;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.Queue;
import java.util.Set;
import org.mozilla.gecko.db.BrowserDB;
import org.mozilla.gecko.util.ThreadUtils;
import android.database.Cursor;
import android.os.Handler;
import android.os.SystemClock;
import android.util.Log;
class GlobalHistory {
private static final String LOGTAG = "GeckoGlobalHistory";
private static final String TELEMETRY_HISTOGRAM_ADD = "FENNEC_GLOBALHISTORY_ADD_MS";
private static final String TELEMETRY_HISTOGRAM_UPDATE = "FENNEC_GLOBALHISTORY_UPDATE_MS";
private static final String TELEMETRY_HISTOGRAM_BUILD_VISITED_LINK = "FENNEC_GLOBALHISTORY_VISITED_BUILD_MS";
private static final 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 = ThreadUtils.getBackgroundHandler();
mPendingUris = new LinkedList<String>();
mVisitedCache = new SoftReference<Set<String>>(null);
mNotifierRunnable = new Runnable() {
@Override
public void run() {
Set<String> visitedSet = mVisitedCache.get();
if (visitedSet == null) {
// The cache was wiped. Repopulate it.
Log.w(LOGTAG, "Rebuilding visited link set...");
final long start = SystemClock.uptimeMillis();
final Cursor c = BrowserDB.getAllVisitedHistory(GeckoAppShell.getContext().getContentResolver());
if (c == null) {
return;
}
try {
visitedSet = new HashSet<String>();
if (c.moveToFirst()) {
do {
visitedSet.add(c.getString(0));
} while (c.moveToNext());
}
mVisitedCache = new SoftReference<Set<String>>(visitedSet);
final long end = SystemClock.uptimeMillis();
final long took = end - start;
Telemetry.HistogramAdd(TELEMETRY_HISTOGRAM_BUILD_VISITED_LINK, (int) Math.min(took, Integer.MAX_VALUE));
} finally {
c.close();
}
}
// This runs on the same handler thread as the checkUriVisited code,
// so no synchronization is needed.
while (true) {
final 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);
}
public void add(String uri) {
final long start = SystemClock.uptimeMillis();
BrowserDB.updateVisitedHistory(GeckoAppShell.getContext().getContentResolver(), uri);
final long end = SystemClock.uptimeMillis();
final long took = end - start;
Telemetry.HistogramAdd(TELEMETRY_HISTOGRAM_ADD, (int) Math.min(took, Integer.MAX_VALUE));
addToGeckoOnly(uri);
}
@SuppressWarnings("static-method")
public void update(String uri, String title) {
final long start = SystemClock.uptimeMillis();
BrowserDB.updateHistoryTitle(GeckoAppShell.getContext().getContentResolver(), uri, title);
final long end = SystemClock.uptimeMillis();
final long took = end - start;
Telemetry.HistogramAdd(TELEMETRY_HISTOGRAM_UPDATE, (int) Math.min(took, Integer.MAX_VALUE));
}
public void checkUriVisited(final String uri) {
mHandler.post(new Runnable() {
@Override
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);
}
});
}
}