Source Code Cross Referenced for CacheManager.java in  » Web-Mail » claros-intouch2-2.2-beta » org » claros » commons » cache » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Mail » claros intouch2 2.2 beta » org.claros.commons.cache 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.claros.commons.cache;
002:
003:        import java.util.Date;
004:        import java.util.HashMap;
005:
006:        public class CacheManager {
007:            private static HashMap<String, Object> cacheMap = new HashMap<String, Object>();
008:
009:            /**
010:             * This class is singleton so private constructor is used.
011:             */
012:            private CacheManager() {
013:                super ();
014:            }
015:
016:            /**
017:             * returns cache item from hashmap
018:             * @param key
019:             * @return Cache
020:             */
021:            private synchronized static Cache getCache(String key) {
022:                return (Cache) cacheMap.get(key);
023:            }
024:
025:            /**
026:             * Looks at the hashmap if a cache item exists or not
027:             * @param key
028:             * @return Cache
029:             */
030:            private synchronized static boolean hasCache(String key) {
031:                return cacheMap.containsKey(key);
032:            }
033:
034:            /**
035:             * Invalidates all cache
036:             */
037:            public synchronized static void invalidateAll() {
038:                cacheMap.clear();
039:            }
040:
041:            /**
042:             * Invalidates a single cache item
043:             * @param key
044:             */
045:            public synchronized static void invalidate(String key) {
046:                cacheMap.remove(key);
047:            }
048:
049:            /**
050:             * Adds new item to cache hashmap
051:             * @param key
052:             * @return Cache
053:             */
054:            private synchronized static void putCache(String key, Cache object) {
055:                cacheMap.put(key, object);
056:            }
057:
058:            /**
059:             * Reads a cache item's content
060:             * @param key
061:             * @return
062:             */
063:            public static Cache getContent(String key) {
064:                if (hasCache(key)) {
065:                    Cache cache = getCache(key);
066:                    if (cacheExpired(cache)) {
067:                        cache.setExpired(true);
068:                    }
069:                    return cache;
070:                } else {
071:                    return null;
072:                }
073:            }
074:
075:            /**
076:             * 
077:             * @param key
078:             * @param content
079:             * @param ttl
080:             */
081:            public static void putContent(String key, Object content, long ttl) {
082:                Cache cache = new Cache();
083:                cache.setKey(key);
084:                cache.setValue(content);
085:                cache.setTimeOut(ttl + new Date().getTime());
086:                cache.setExpired(false);
087:                putCache(key, cache);
088:            }
089:
090:            /** @modelguid {172828D6-3AB2-46C4-96E2-E72B34264031} */
091:            private static boolean cacheExpired(Cache cache) {
092:                if (cache == null) {
093:                    return false;
094:                }
095:                long milisNow = new Date().getTime();
096:                long milisExpire = cache.getTimeOut();
097:                if (milisExpire < 0) { // Cache never expires 
098:                    return false;
099:                } else if (milisNow >= milisExpire) {
100:                    return true;
101:                } else {
102:                    return false;
103:                }
104:            }
105:
106:        }
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