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123 lines
4.4 KiB
123 lines
4.4 KiB
// EventTracker.java
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// (C) 2007 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 17.11.2007 on http://yacy.net
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//
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// This is a part of YaCy, a peer-to-peer based web search engine
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//
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// $LastChangedDate: 2009-11-05 21:28:37 +0100 (Do, 05 Nov 2009) $
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// $LastChangedRevision: 6458 $
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// $LastChangedBy: orbiter $
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//
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// LICENSE
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program 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
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package net.yacy.kelondro.util;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentLinkedQueue;
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public class EventTracker {
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private final static Map<String, ConcurrentLinkedQueue<Event>> historyMaps = new ConcurrentHashMap<String, ConcurrentLinkedQueue<Event>>();
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private final static Map<String, Long> eventAccess = new ConcurrentHashMap<String, Long>(); // value: last time when this was accessed
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public final static void update(
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final String eventName,
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final Object eventPayload,
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boolean useProtection,
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int maxQueueSize,
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long maxQueueAge) {
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// check protection against too heavy access
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if (useProtection) {
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Long lastAcc = eventAccess.get(eventName);
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if (lastAcc == null) {
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eventAccess.put(eventName, Long.valueOf(System.currentTimeMillis()));
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} else {
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long time = System.currentTimeMillis();
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if (time - lastAcc.longValue() < 1000) {
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return; // protect against too heavy load
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}
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eventAccess.put(eventName, Long.valueOf(time));
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}
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}
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// get event history container
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ConcurrentLinkedQueue<Event> history = historyMaps.get(eventName);
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// create history
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if (history == null) {
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history = new ConcurrentLinkedQueue<Event>();
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// update entry
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history.offer(new Event(eventPayload));
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// store map
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historyMaps.put(eventName, history);
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return;
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}
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// update history
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history.offer(new Event(eventPayload));
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// clean up too old entries
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int tp = history.size() - maxQueueSize;
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while (tp-- > 0) history.poll();
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if (history.size() % 10 == 0) { // reduce number of System.currentTimeMillis() calls
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synchronized (history) {
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if (history.size() % 10 == 0) { // check again
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Event e;
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final long now = System.currentTimeMillis();
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while (history.size() > 0) {
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e = history.peek();
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if (now - e.time < maxQueueAge) break;
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history.poll();
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}
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}
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}
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}
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}
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public final static Iterator<Event> getHistory(final String eventName) {
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ConcurrentLinkedQueue<Event> list = historyMaps.get(eventName);
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if (list == null) return null;
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return list.iterator();
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}
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public final static int countEvents(final String eventName, long time) {
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Iterator<Event> event = getHistory(eventName);
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if (event == null) return 0;
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long now = System.currentTimeMillis();
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int count = 0;
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while (event.hasNext()) {
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if (now - event.next().time < time) count++;
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}
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return count;
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}
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public final static class Event {
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public Object payload;
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public long time;
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public Event(final Object payload) {
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this.payload = payload;
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this.time = System.currentTimeMillis();
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}
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}
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}
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