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/*******************************************************************************
* Copyright (c) 1997, 2018 by ProSyst Software GmbH
* http://www.prosyst.com
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* ProSyst Software GmbH - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.internal.util.pool;
/**
* @author Pavlin Dobrev
* @version 1.0
*/
public class ObjectPool {
private Class template;
protected Object[][] buff;
protected int nextFree;
protected int size;
protected int minimumFill;
protected int factor;
protected int minfSize;
protected int minffactor;
// protected int usageGet = 0;
// protected int usageReleased = 0;
protected boolean dontExtend = false;
protected ObjectCreator oc;
public Object getInstance() throws Exception {
return oc != null ? oc.getInstance() : template.newInstance();
}
public ObjectPool(ObjectCreator oc, int size, int factor) {
this(null, oc, size, factor, size * factor);
}
public ObjectPool(Class template, int size, int factor) {
this(template, null, size, factor, size * factor);
}
public ObjectPool(Class template, int size, int factor, int minimumFill) {
this(template, null, size, factor, (minimumFill = (minimumFill > (size * factor)) ? (size * factor) : minimumFill));
}
public ObjectPool(ObjectCreator oc, int size, int factor, int minimumFill) {
this(null, oc, size, factor, (minimumFill = minimumFill > (size * factor) ? (size * factor) : minimumFill));
}
protected ObjectPool(Class template, ObjectCreator oc, int size, int factor, int minimumFill) {
if (size <= 1 || factor < 1) {
throw new IllegalArgumentException(size + " is less or equal to 1");
}
this.minimumFill = minimumFill < 1 ? 1 : minimumFill;
this.oc = oc;
if (template != null) {
try {
template.getConstructor();
this.template = template;
} catch (NoSuchMethodException nsm) {
throw new IllegalArgumentException(template + " don't have default constructor!");
}
}
buff = new Object[size][];
this.size = size;
this.factor = factor;
minfSize = this.minimumFill / factor;
minffactor = this.minimumFill % factor;
// System.out.println("minimumFill " + this.minimumFill);
// System.out.println("minfSize " + minfSize);
// System.out.println("minffactor " + minffactor);
if (minimumFill <= 1) {
nextFree = -1;
} else {
for (int i = 0; i < (minfSize == 0 ? 1 : minfSize); i++) {
buff[i] = new Object[factor];
}
fill();
}
// start();
}
private void fill() {
int i = 0;
synchronized (buff) {
for (; (i < minfSize); i++) {
put(i, factor);
}
if (minffactor > 0) {
put(i, minffactor);
}
}
nextFree = minimumFill - 1;
}
private void put(int i, int count) {
for (int j = 0; j < count; j++) {
try {
if (buff[i] == null) {
buff[i] = new Object[factor];
}
buff[i][j] = getInstance();
nextFree = i * j;
} catch (Throwable t) {
throw new RuntimeException("buffer fill failed: " + t);
}
}
}
public void clear() {
dontExtend = true;
shrink(-1);
}
protected void shrink(int count) {
synchronized (buff) {
for (; nextFree > count; nextFree--) {
buff[(nextFree / factor)][nextFree % factor] = null;
}
}
}
public void shrink() {
dontExtend = true;
shrink(minimumFill);
dontExtend = false;
}
public Object getObject() {
Object tmp = null;
synchronized (buff) {
if (nextFree < 0) {
if (dontExtend) {
throw new RuntimeException();
}
if (minimumFill <= 1) {
try {
return getInstance();
} catch (Throwable e) {
throw new RuntimeException("buffer fill failed: " + e);
}
}
fill();
}
tmp = buff[(nextFree / factor)][(nextFree % factor)];
buff[(nextFree / factor)][nextFree % factor] = null;
nextFree--;
// usageGet++;
return tmp;
}
}
public boolean releaseObject(Object obj) {
// usageReleased++;
if (dontExtend) {
return false;
}
synchronized (buff) {
int tmp = nextFree + 1;
int telement = tmp / factor;
if ((telement) < size) {
if (buff[telement] == null) {
buff[telement] = new Object[factor];
}
buff[telement][tmp % factor] = obj;
nextFree = tmp;
return true;
}
return false;
}
}
}
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