Source Code Cross Referenced for BeanCacheManager.java in  » Net » Coadunation_1.0.1 » com » rift » coad » lib » bean » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Net » Coadunation_1.0.1 » com.rift.coad.lib.bean 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * CoadunationLib: The coaduntion implementation library.
003:         * Copyright (C) 2006  Rift IT Contracting
004:         * 
005:         * This library is free software; you can redistribute it and/or
006:         * modify it under the terms of the GNU Lesser General Public
007:         * License as published by the Free Software Foundation; either
008:         * version 2.1 of the License, or (at your option) any later version.
009:         * 
010:         * This library is distributed in the hope that it will be useful,
011:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
012:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013:         * Lesser General Public License for more details.
014:         * 
015:         * You should have received a copy of the GNU Lesser General Public
016:         * License along with this library; if not, write to the Free Software
017:         * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
018:         *
019:         * BeanCacheManager.java
020:         *
021:         * This object is responsible for managing the bean cache entries.
022:         */
023:
024:        // package path
025:        package com.rift.coad.lib.bean;
026:
027:        // java imports
028:        import java.util.Map;
029:        import java.util.HashMap;
030:        import java.util.Iterator;
031:
032:        // coadunation imports
033:        import com.rift.coad.lib.cache.Cache;
034:        import com.rift.coad.lib.cache.CacheEntry;
035:        import com.rift.coad.lib.thread.ThreadStateMonitor;
036:
037:        /**
038:         * This object is responsible for managing the bean cache entries.
039:         *
040:         * @author Brett Chaldecott
041:         */
042:        public class BeanCacheManager implements  Cache {
043:
044:            // the classes private member variables
045:            private Map beanCaches = new HashMap();
046:            private ThreadStateMonitor status = new ThreadStateMonitor();
047:
048:            /** 
049:             * Creates a new instance of BeanCacheManager
050:             */
051:            public BeanCacheManager() {
052:
053:            }
054:
055:            /**
056:             * This method returns the reference to the bean cache.
057:             *
058:             * @return The reference to the bean cache.
059:             * @param ref The reference to the bean cache.
060:             * @exception BeanException
061:             */
062:            public BeanCache getBeanCache(Object ref) throws BeanException {
063:                checkStatus();
064:                synchronized (beanCaches) {
065:                    if (!beanCaches.containsKey(ref)) {
066:                        beanCaches.put(ref, new BeanCache());
067:                    }
068:                    return (BeanCache) beanCaches.get(ref);
069:                }
070:            }
071:
072:            /**
073:             * This method is called to perform garbage collection on the cache entries.
074:             */
075:            public void garbageCollect() {
076:                Map beanCaches = new HashMap();
077:                synchronized (this .beanCaches) {
078:                    beanCaches.putAll(this .beanCaches);
079:                }
080:                for (Iterator iter = beanCaches.keySet().iterator(); iter
081:                        .hasNext();) {
082:                    BeanCache beanCache = (BeanCache) beanCaches.get(iter
083:                            .next());
084:                    beanCache.garbageCollect();
085:                }
086:            }
087:
088:            /**
089:             * This method is called to forcibly remove everything from the cache.
090:             */
091:            public void clear() {
092:                status.terminate(true);
093:                Map beanCaches = new HashMap();
094:                synchronized (this .beanCaches) {
095:                    beanCaches.putAll(this .beanCaches);
096:                    this .beanCaches.clear();
097:                }
098:                for (Iterator iter = beanCaches.keySet().iterator(); iter
099:                        .hasNext();) {
100:                    BeanCache beanCache = (BeanCache) beanCaches.get(iter
101:                            .next());
102:                    beanCache.clear();
103:                }
104:            }
105:
106:            /**
107:             * This mehtod returns true if the cache contains the checked entry.
108:             *
109:             * @return TRUE if the cache contains the checked entry.
110:             * @param cacheEntry The entry to perform the check for.
111:             */
112:            public boolean contains(Object cacheEntry) {
113:                synchronized (beanCaches) {
114:                    return beanCaches.containsKey(cacheEntry);
115:                }
116:            }
117:
118:            /**
119:             * This method checks the status of the bean cache manager.
120:             *
121:             * @exception BeanException
122:             */
123:            private void checkStatus() throws BeanException {
124:                if (status.isTerminated()) {
125:                    throw new BeanException(
126:                            "Bean cache manager has been terminated.");
127:                }
128:            }
129:        }
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