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315 lines
12 KiB
315 lines
12 KiB
// kelondroObjectCache.java
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// ------------------------
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// (C) by Michael Peter Christen; mc@anomic.de
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2006
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//
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// This is a part of the kelondro database, which is a part of YaCy
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//
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// $LastChangedDate: 2006-04-02 22:40:07 +0200 (So, 02 Apr 2006) $
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// $LastChangedRevision: 1986 $
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// $LastChangedBy: orbiter $
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//
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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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//
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//
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// A NOTE FROM THE AUTHOR TO THE USERS:
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//
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// Using this software in any meaning (reading, learning, copying, compiling,
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// running) means that you agree that the Author(s) is (are) not responsible
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// for cost, loss of data or any harm that may be caused directly or indirectly
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// by usage of this softare or this documentation. The usage of this software
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// is on your own risk. The installation and usage (starting/running) of this
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// software may allow other people or application to access your computer and
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// any attached devices and is highly dependent on the configuration of the
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// software which must be done by the user of the software; the author(s) is
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// (are) also not responsible for proper configuration and usage of the
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// software, even if provoked by documentation provided together with
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// the software.
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//
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//
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// A NOTE FROM THE AUTHOR TO DEVELOPERS:
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//
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// Contributions and changes to the program code should be marked as such:
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// Please enter your own (C) notice below; they must be compatible with the GPL.
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// Please mark also all changes in the code; if you don't mark them then they
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// can't be identified; thus all unmarked code belong to the copyright holder
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// as mentioned above. A good documentation of code authorities will also help
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// to maintain the code and the project.
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// A re-distribution must contain the intact and unchanged copyright statement.
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package de.anomic.kelondro;
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import java.util.TreeMap;
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public class kelondroObjectCache {
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private final TreeMap cache;
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private final kelondroMScoreCluster ages, hasnot;
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private long startTime;
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private int maxSize;
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private long maxAge;
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private long minMem;
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private int readHit, readMiss, writeUnique, writeDouble, cacheDelete, cacheFlush;
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private int hasnotHit, hasnotMiss, hasnotUnique, hasnotDouble, hasnotDelete, hasnotFlush;
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private String name;
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public kelondroObjectCache(String name, int maxSize, long maxAge, long minMem) {
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this.name = name;
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this.cache = new TreeMap();
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this.ages = new kelondroMScoreCluster();
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this.hasnot = new kelondroMScoreCluster();
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this.startTime = System.currentTimeMillis();
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this.maxSize = Math.max(maxSize, 1);
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this.maxAge = Math.max(maxAge, 10000);
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this.minMem = Math.max(minMem, 1024 * 1024);
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this.readHit = 0;
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this.readMiss = 0;
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this.writeUnique = 0;
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this.writeDouble = 0;
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this.cacheDelete = 0;
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this.cacheFlush = 0;
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this.hasnotHit = 0;
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this.hasnotMiss = 0;
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this.hasnotUnique = 0;
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this.hasnotDouble = 0;
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this.hasnotDelete = 0;
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this.hasnotFlush = 0;
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}
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public String getName() {
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return name;
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}
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public void setMaxAge(long maxAge) {
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this.maxAge = maxAge;
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}
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public void setMaxSize(int maxSize) {
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this.maxSize = maxSize;
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}
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public int maxSize() {
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return this.maxSize;
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}
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public void setMinMem(int minMem) {
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this.minMem = minMem;
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}
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public long minAge() {
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if (ages.size() == 0) return 0;
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return System.currentTimeMillis() - longEmit(ages.getMaxScore());
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}
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public long maxAge() {
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if (ages.size() == 0) return 0;
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return System.currentTimeMillis() - longEmit(ages.getMinScore());
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}
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public int hitsize() {
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return cache.size();
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}
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public int misssize() {
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return hasnot.size();
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}
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public String[] status() {
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return new String[]{
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Integer.toString(maxSize()),
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Integer.toString(hitsize()),
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Integer.toString(misssize()),
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Long.toString(this.maxAge),
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Long.toString(minAge()),
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Long.toString(maxAge()),
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Integer.toString(readHit),
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Integer.toString(readMiss),
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Integer.toString(writeUnique),
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Integer.toString(writeDouble),
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Integer.toString(cacheDelete),
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Integer.toString(cacheFlush),
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Integer.toString(hasnotHit),
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Integer.toString(hasnotMiss),
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Integer.toString(hasnotUnique),
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Integer.toString(hasnotDouble),
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Integer.toString(hasnotDelete),
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Integer.toString(hasnotFlush)
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};
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}
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private static String[] combinedStatus(String[] a, String[] b) {
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return new String[]{
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Integer.toString(Integer.parseInt(a[0]) + Integer.parseInt(b[0])),
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Integer.toString(Integer.parseInt(a[1]) + Integer.parseInt(b[1])),
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Integer.toString(Integer.parseInt(a[2]) + Integer.parseInt(b[2])),
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Long.toString(Math.max(Long.parseLong(a[3]), Long.parseLong(b[3]))),
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Long.toString(Math.min(Long.parseLong(a[4]), Long.parseLong(b[4]))),
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Long.toString(Math.max(Long.parseLong(a[5]), Long.parseLong(b[5]))),
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Integer.toString(Integer.parseInt(a[6]) + Integer.parseInt(b[6])),
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Integer.toString(Integer.parseInt(a[7]) + Integer.parseInt(b[7])),
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Integer.toString(Integer.parseInt(a[8]) + Integer.parseInt(b[8])),
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Integer.toString(Integer.parseInt(a[9]) + Integer.parseInt(b[9])),
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Integer.toString(Integer.parseInt(a[10]) + Integer.parseInt(b[10])),
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Integer.toString(Integer.parseInt(a[11]) + Integer.parseInt(b[11])),
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Integer.toString(Integer.parseInt(a[12]) + Integer.parseInt(b[12])),
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Integer.toString(Integer.parseInt(a[13]) + Integer.parseInt(b[13])),
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Integer.toString(Integer.parseInt(a[14]) + Integer.parseInt(b[14])),
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Integer.toString(Integer.parseInt(a[15]) + Integer.parseInt(b[15])),
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Integer.toString(Integer.parseInt(a[16]) + Integer.parseInt(b[16])),
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Integer.toString(Integer.parseInt(a[17]) + Integer.parseInt(b[17]))
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};
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}
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public static String[] combinedStatus(String[][] a, int l) {
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if ((a == null) || (a.length == 0) || (l == 0)) return null;
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if ((a.length >= 1) && (l == 1)) return a[0];
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if ((a.length >= 2) && (l == 2)) return combinedStatus(a[0], a[1]);
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return combinedStatus(combinedStatus(a, l - 1), a[l - 1]);
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}
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private int intTime(long longTime) {
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return (int) Math.max(0, ((longTime - startTime) / 1000));
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}
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private long longEmit(int intTime) {
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return (((long) intTime) * (long) 1000) + startTime;
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}
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public void put(byte[] key, Object value) {
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if (key != null) put(new String(key), value);
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}
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public void put(String key, Object value) {
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if ((key == null) || (value == null)) return;
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Object prev = null;
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synchronized(cache) {
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prev = cache.put(key, value);
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ages.setScore(key, intTime(System.currentTimeMillis()));
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if (hasnot.deleteScore(key) != 0) hasnotDelete++;
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}
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if (prev == null) this.writeUnique++; else this.writeDouble++;
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flushc();
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}
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public Object get(byte[] key) {
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return get(new String(key));
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}
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public Object get(String key) {
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if (key == null) return null;
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Object r = null;
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synchronized(cache) {
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r = cache.get(key);
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if (r == null) {
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this.readMiss++;
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} else {
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this.readHit++;
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ages.setScore(key, intTime(System.currentTimeMillis())); // renew cache update time
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}
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}
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flushc();
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return r;
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}
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public void hasnot(byte[] key) {
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hasnot(new String(key));
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}
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public void hasnot(String key) {
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if (key == null) return;
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int prev = 0;
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synchronized(cache) {
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if (cache.remove(key) != null) cacheDelete++;
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ages.deleteScore(key);
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prev = hasnot.getScore(key);
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hasnot.setScore(key, intTime(System.currentTimeMillis()));
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}
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if (prev == 0) this.hasnotUnique++; else this.hasnotDouble++;
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flushh();
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}
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public int has(byte[] key) {
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return has(new String(key));
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}
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public int has(String key) {
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// returns a 3-value boolean:
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// 1 = key definitely exists
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// -1 = key definitely does not exist
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// 0 = unknown, if key exists
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if (key == null) return 0;
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synchronized(cache) {
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if (hasnot.getScore(key) > 0) {
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hasnot.setScore(key, intTime(System.currentTimeMillis())); // renew cache update time
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this.hasnotHit++;
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return -1;
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}
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this.hasnotMiss++;
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if (cache.get(key) != null) return 1;
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}
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flushh();
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return 0;
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}
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public void remove(byte[] key) {
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remove(new String(key));
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}
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public void remove(String key) {
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if (key == null) return;
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synchronized(cache) {
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if (cache.remove(key) != null) cacheDelete++;
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ages.deleteScore(key);
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hasnot.setScore(key, intTime(System.currentTimeMillis()));
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}
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}
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public void flushc() {
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String k;
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synchronized(cache) {
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while ((ages.size() > 0) &&
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((k = (String) ages.getMinObject()) != null) &&
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((ages.size() > maxSize) ||
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(((System.currentTimeMillis() - longEmit(ages.getScore(k))) > maxAge) &&
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(Runtime.getRuntime().freeMemory() < minMem)))
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) {
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cache.remove(k);
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ages.deleteScore(k);
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cacheFlush++;
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}
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}
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}
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public void flushh() {
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String k;
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synchronized(cache) {
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while ((hasnot.size() > 0) &&
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((k = (String) hasnot.getMinObject()) != null) &&
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((hasnot.size() > maxSize) ||
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(((System.currentTimeMillis() - longEmit(hasnot.getScore(k))) > maxAge) &&
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(Runtime.getRuntime().freeMemory() < minMem)))
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) {
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hasnot.deleteScore(k);
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hasnotFlush++;
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}
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}
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}
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}
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