001: /*
002: * The Apache Software License, Version 1.1
003: *
004: * Copyright (c) 1999 The Apache Software Foundation. All rights
005: * reserved.
006: *
007: * Redistribution and use in source and binary forms, with or without
008: * modification, are permitted provided that the following conditions
009: * are met:
010: *
011: * 1. Redistributions of source code must retain the above copyright
012: * notice, this list of conditions and the following disclaimer.
013: *
014: * 2. Redistributions in binary form must reproduce the above copyright
015: * notice, this list of conditions and the following disclaimer in
016: * the documentation and/or other materials provided with the
017: * distribution.
018: *
019: * 3. The end-user documentation included with the redistribution, if
020: * any, must include the following acknowlegement:
021: * "This product includes software developed by the
022: * Apache Software Foundation (http://www.apache.org/)."
023: * Alternately, this acknowlegement may appear in the software itself,
024: * if and wherever such third-party acknowlegements normally appear.
025: *
026: * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
027: * Foundation" must not be used to endorse or promote products derived
028: * from this software without prior written permission. For written
029: * permission, please contact apache@apache.org.
030: *
031: * 5. Products derived from this software may not be called "Apache"
032: * nor may "Apache" appear in their names without prior written
033: * permission of the Apache Group.
034: *
035: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
036: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
037: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
038: * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
039: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
040: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
041: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
042: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
043: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
044: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
045: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
046: * SUCH DAMAGE.
047: * ====================================================================
048: *
049: * This software consists of voluntary contributions made by many
050: * individuals on behalf of the Apache Software Foundation. For more
051: * information on the Apache Software Foundation, please see
052: * <http://www.apache.org/>.
053: *
054: * [Additional notices, if required by prior licensing conditions]
055: *
056: */
057:
058: package com.rimfaxe.webserver.runtime;
059:
060: /**
061: * Simple object pool. Based on ThreadPool and few other classes
062: *
063: * The pool will ignore overflow and return null if empty.
064: *
065: * @author Gal Shachor
066: * @author Costin
067: */
068: public final class SimplePool {
069: /*
070: * Where the threads are held.
071: */
072: private Object pool[];
073:
074: private int max;
075: private int current = -1;
076:
077: Object lock;
078: public static final int DEFAULT_SIZE = 16;
079:
080: public SimplePool() {
081: this .max = DEFAULT_SIZE;
082: pool = new Object[max];
083: lock = new Object();
084: }
085:
086: public SimplePool(int max) {
087: this .max = max;
088: pool = new Object[max];
089: lock = new Object();
090: }
091:
092: public void set(Object o) {
093: put(o);
094: }
095:
096: /**
097: * Add the object to the pool, silent nothing if the pool is full
098: */
099: public void put(Object o) {
100: synchronized (lock) {
101: if (current < (max - 1)) {
102: current += 1;
103: pool[current] = o;
104: }
105: }
106: }
107:
108: /**
109: * Get an object from the pool, null if the pool is empty.
110: */
111: public Object get() {
112: Object item = null;
113: synchronized (lock) {
114: if (current >= 0) {
115: item = pool[current];
116: current -= 1;
117: }
118: }
119: return item;
120: }
121:
122: /**
123: * Return the size of the pool
124: */
125: public int getMax() {
126: return max;
127: }
128: }
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