Source Code Cross Referenced for CacheFIFO.java in  » Library » jakarta-oro-2.0.8 » org » apache » oro » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » jakarta oro 2.0.8 » org.apache.oro.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Id: CacheFIFO.java,v 1.7 2003/11/07 20:16:25 dfs Exp $
003:         *
004:         * ====================================================================
005:         * The Apache Software License, Version 1.1
006:         *
007:         * Copyright (c) 2000 The Apache Software Foundation.  All rights
008:         * reserved.
009:         *
010:         * Redistribution and use in source and binary forms, with or without
011:         * modification, are permitted provided that the following conditions
012:         * are met:
013:         *
014:         * 1. Redistributions of source code must retain the above copyright
015:         *    notice, this list of conditions and the following disclaimer.
016:         *
017:         * 2. Redistributions in binary form must reproduce the above copyright
018:         *    notice, this list of conditions and the following disclaimer in
019:         *    the documentation and/or other materials provided with the
020:         *    distribution.
021:         *
022:         * 3. The end-user documentation included with the redistribution,
023:         *    if any, must include the following acknowledgment:
024:         *       "This product includes software developed by the
025:         *        Apache Software Foundation (http://www.apache.org/)."
026:         *    Alternately, this acknowledgment may appear in the software itself,
027:         *    if and wherever such third-party acknowledgments normally appear.
028:         *
029:         * 4. The names "Apache" and "Apache Software Foundation", "Jakarta-Oro" 
030:         *    must not be used to endorse or promote products derived from this
031:         *    software without prior written permission. For written
032:         *    permission, please contact apache@apache.org.
033:         *
034:         * 5. Products derived from this software may not be called "Apache" 
035:         *    or "Jakarta-Oro", nor may "Apache" or "Jakarta-Oro" appear in their 
036:         *    name, without prior written permission of the Apache Software Foundation.
037:         *
038:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
039:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
040:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
041:         * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
042:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
043:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
044:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
045:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
046:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
047:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
048:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
049:         * SUCH DAMAGE.
050:         * ====================================================================
051:         *
052:         * This software consists of voluntary contributions made by many
053:         * individuals on behalf of the Apache Software Foundation.  For more
054:         * information on the Apache Software Foundation, please see
055:         * <http://www.apache.org/>.
056:         */
057:
058:        package org.apache.oro.util;
059:
060:        import java.util.*;
061:
062:        /**
063:         * This class is a GenericCache subclass implementing a FIFO (First
064:         * In First Out) cache replacement policy.  In other words, values are
065:         * added to the cache until the cache becomes full.  Once the cache is full,
066:         * if a new pattern is added to the cache, it replaces the first of
067:         * the current patterns in the cache to have been added.
068:         *
069:         * @version @version@
070:         * @since 1.0
071:         * @see GenericCache
072:         */
073:
074:        public final class CacheFIFO extends GenericCache {
075:            private int __curent = 0;
076:
077:            /**
078:             * Creates a CacheFIFO instance with a given cache capacity.
079:             * <p>
080:             * @param capacity  The capacity of the cache.
081:             */
082:            public CacheFIFO(int capacity) {
083:                super (capacity);
084:            }
085:
086:            /**
087:             * Same as:
088:             * <blockquote><pre>
089:             * CacheFIFO(GenericCache.DEFAULT_CAPACITY);
090:             * </pre></blockquote>
091:             */
092:            public CacheFIFO() {
093:                this (GenericCache.DEFAULT_CAPACITY);
094:            }
095:
096:            /**
097:             * Adds a value to the cache.  If the cache is full, when a new value
098:             * is added to the cache, it replaces the first of the current values
099:             * in the cache to have been added (i.e., FIFO).
100:             * <p>
101:             * @param key   The key referencing the value added to the cache.
102:             * @param value The value to add to the cache.
103:             */
104:            public final synchronized void addElement(Object key, Object value) {
105:                int index;
106:                Object obj;
107:
108:                obj = _table.get(key);
109:
110:                if (obj != null) {
111:                    GenericCacheEntry entry;
112:
113:                    // Just replace the value.  Technically this upsets the FIFO ordering,
114:                    // but it's expedient.
115:                    entry = (GenericCacheEntry) obj;
116:                    entry._value = value;
117:                    entry._key = key;
118:
119:                    return;
120:                }
121:
122:                // If we haven't filled the cache yet, put it at the end.
123:                if (!isFull()) {
124:                    index = _numEntries;
125:                    ++_numEntries;
126:                } else {
127:                    // Otherwise, replace the current pointer, which takes care of
128:                    // FIFO in a circular fashion.
129:                    index = __curent;
130:
131:                    if (++__curent >= _cache.length)
132:                        __curent = 0;
133:
134:                    _table.remove(_cache[index]._key);
135:                }
136:
137:                _cache[index]._value = value;
138:                _cache[index]._key = key;
139:                _table.put(key, _cache[index]);
140:            }
141:
142:        }
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