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105 lines
3.8 KiB
105 lines
3.8 KiB
// kelondroObjectSpace.java
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// ------------------------
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// part of The Kelondro Database
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// (C) by Michael Peter Christen; mc@yacy.net
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2005
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// created: 12.12.2004
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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.ArrayList;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.TreeMap;
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public class ObjectSpace {
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private static final int minSize = 10;
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private static final int maxSize = 256;
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private static Map<Integer, ArrayList<byte[]>> objHeap = new HashMap<Integer, ArrayList<byte[]>>();
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private static TreeMap<Integer, Integer> aliveNow = new TreeMap<Integer, Integer>();
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//private static TreeMap aliveMax = new TreeMap();
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private static void incAlive(final int size) {
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final Integer s = Integer.valueOf(size);
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synchronized (aliveNow) {
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final Integer x = aliveNow.get(s);
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if (x == null) aliveNow.put(s, Integer.valueOf(1)); else aliveNow.put(s, Integer.valueOf(x.intValue() + 1));
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}
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}
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private static void decAlive(final int size) {
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final Integer s = Integer.valueOf(size);
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synchronized (aliveNow) {
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final Integer x = aliveNow.get(s);
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if (x == null) aliveNow.put(s, Integer.valueOf(-1)); else aliveNow.put(s, Integer.valueOf(x.intValue() - 1));
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}
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}
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public static byte[] alloc(final int len) {
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if ((len < minSize) || (len > maxSize)) return new byte[len];
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incAlive(len);
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synchronized (objHeap) {
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final ArrayList<byte[]> buf = objHeap.get(Integer.valueOf(len));
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if (buf == null || buf.isEmpty()) return new byte[len];
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return buf.remove(buf.size() - 1);
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}
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}
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public static void recycle(final byte[] b) {
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if ((b.length < minSize) || (b.length > maxSize)) {
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return;
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}
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decAlive(b.length);
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synchronized (objHeap) {
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final Integer i = Integer.valueOf(b.length);
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ArrayList<byte[]> buf = objHeap.get(i);
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if (buf == null) {
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buf = new ArrayList<byte[]>();
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buf.add(b);
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objHeap.put(i, buf);
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} else {
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buf.add(b);
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}
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}
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}
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public static TreeMap<Integer, Integer> statAlive() {
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return aliveNow;
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}
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public static TreeMap<Integer, Integer> statHeap() {
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// creates a statistic output of this object space
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// the result is a mapping from Integer (chunk size) to Integer (number of counts)
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// and shows how many Objects are held in this space for usage
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final TreeMap<Integer, Integer> result = new TreeMap<Integer, Integer>();
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synchronized (objHeap) {
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final Iterator<Map.Entry<Integer, ArrayList<byte[]>>> i = objHeap.entrySet().iterator();
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Map.Entry<Integer, ArrayList<byte[]>> entry;
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while (i.hasNext()) {
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entry = i.next();
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result.put(entry.getKey(), Integer.valueOf(entry.getValue().size()));
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}
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}
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return result;
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}
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}
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