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69 lines
2.6 KiB
69 lines
2.6 KiB
/**
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* AccessTracker
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* an interface for Adaptive Replacement Caches
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* Copyright 2009 by Michael Peter Christen, mc@yacy.net, Frankfurt a. M., Germany
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* First released 29.08.2009 at http://yacy.net
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program in the file lgpl21.txt
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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package de.anomic.search;
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import java.util.Iterator;
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import java.util.LinkedList;
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public class AccessTracker {
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public static final int minSize = 1000;
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public static final int maxSize = 5000;
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public static final int maxAge = 10 * 60 * 1000;
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public enum Location {local, remote}
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private static LinkedList<QueryParams> localSearches = new LinkedList<QueryParams>();
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private static LinkedList<QueryParams> remoteSearches = new LinkedList<QueryParams>();
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public static void add(Location location, QueryParams query) {
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if (location == Location.local) synchronized (localSearches) {add(localSearches, query);}
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if (location == Location.remote) synchronized (remoteSearches) {add(remoteSearches, query);}
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}
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private static void add(LinkedList<QueryParams> list, QueryParams query) {
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list.add(query);
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while (list.size() > maxSize) list.removeFirst();
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if (list.size() <= minSize) {
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return;
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}
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long timeout = System.currentTimeMillis() - maxAge;
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while (list.size() > 0) {
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QueryParams q = list.getFirst();
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if (q.time.longValue() > timeout) break;
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list.removeFirst();
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}
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}
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public static Iterator<QueryParams> get(Location location) {
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if (location == Location.local) return localSearches.descendingIterator();
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if (location == Location.remote) return remoteSearches.descendingIterator();
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return null;
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}
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public static int size(Location location) {
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if (location == Location.local) synchronized (localSearches) {return localSearches.size();}
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if (location == Location.remote) synchronized (remoteSearches) {return remoteSearches.size();}
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return 0;
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}
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}
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