Source Code Cross Referenced for InMemoryCache.java in  » Web-Framework » jpublish » com » anthonyeden » lib » cache » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Framework » jpublish » com.anthonyeden.lib.cache 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*-- 
002:
003:         Copyright (C) 2000-2003 Anthony Eden.
004:         All rights reserved.
005:         
006:         Redistribution and use in source and binary forms, with or without
007:         modification, are permitted provided that the following conditions
008:         are met:
009:         
010:         1. Redistributions of source code must retain the above copyright
011:            notice, this list of conditions, and the following disclaimer.
012:         
013:         2. Redistributions in binary form must reproduce the above copyright
014:            notice, this list of conditions, and the disclaimer that follows 
015:            these conditions in the documentation and/or other materials 
016:            provided with the distribution.
017:
018:         3. The name "EdenLib" must not be used to endorse or promote products
019:            derived from this software without prior written permission.  For
020:            written permission, please contact me@anthonyeden.com.
021:         
022:         4. Products derived from this software may not be called "EdenLib", nor
023:            may "EdenLib" appear in their name, without prior written permission
024:            from Anthony Eden (me@anthonyeden.com).
025:         
026:         In addition, I request (but do not require) that you include in the 
027:         end-user documentation provided with the redistribution and/or in the 
028:         software itself an acknowledgement equivalent to the following:
029:             "This product includes software developed by
030:              Anthony Eden (http://www.anthonyeden.com/)."
031:
032:         THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
033:         WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
034:         OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
035:         DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, 
036:         INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
037:         (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
038:         SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
039:         HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
040:         STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
041:         IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
042:         POSSIBILITY OF SUCH DAMAGE.
043:
044:         For more information on EdenLib, please see <http://edenlib.sf.net/>.
045:         
046:         */
047:
048:        package com.anthonyeden.lib.cache;
049:
050:        import java.util.HashMap;
051:
052:        import com.anthonyeden.lib.config.Configuration;
053:        import com.anthonyeden.lib.config.ConfigurationException;
054:
055:        /** Cache implementation which stores the cached values in memory.
056:
057:         @author Anthony Eden
058:         @since 1.1
059:         */
060:
061:        public class InMemoryCache extends AbstractCache {
062:
063:            private HashMap cache;
064:
065:            /** Construct a new InMemoryCache. */
066:
067:            public InMemoryCache() {
068:                cache = new HashMap();
069:            }
070:
071:            /** Get the value for the given key from the cache.  This method may
072:                return null if there is no value or the value is expired.
073:            
074:                @param key The key
075:                @return The value or null
076:             */
077:
078:            public synchronized Object get(Object key) {
079:                CacheEntry cacheEntry = (CacheEntry) cache.get(key);
080:                Object value = null;
081:                if (cacheEntry != null) {
082:                    if (isExpired(cacheEntry)) {
083:                        remove(key);
084:                        return null;
085:                    } else {
086:                        return cacheEntry.getObject();
087:                    }
088:                }
089:                return null;
090:            }
091:
092:            /** Insert a value into the cache.
093:            
094:                @param key The key
095:                @param value The value
096:             */
097:
098:            public synchronized void put(Object key, Object value) {
099:                cache.put(key,
100:                        new CacheEntry(value, System.currentTimeMillis()));
101:            }
102:
103:            /** Insert a value into the cache with the specified time to live.
104:                The specified time to live overrides the default time to live.
105:                A value less than 0 is be considered as "infinate".
106:            
107:                @param key The key
108:                @param value The value
109:                @param ttl The time to live
110:             */
111:
112:            public synchronized void put(Object key, Object value, int ttl) {
113:                cache.put(key, new CacheEntry(value,
114:                        System.currentTimeMillis(), ttl));
115:            }
116:
117:            /** Remove a value from the cache.
118:            
119:                @param key The key
120:             */
121:
122:            public synchronized void remove(Object key) {
123:                cache.remove(key);
124:            }
125:
126:            /** Load the Cache's configuration from the given Configuration object.
127:            
128:                @param configuration The Configuration object
129:                @throws ConfigurationException
130:             */
131:
132:            public void loadConfiguration(Configuration configuration)
133:                    throws ConfigurationException {
134:                setTTL(configuration.getChildValue("ttl"));
135:            }
136:
137:        }
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