Source Code Cross Referenced for CacheableEntityItem.java in  » EJB-Server-resin-3.1.5 » resin » com » caucho » amber » entity » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server resin 3.1.5 » resin » com.caucho.amber.entity 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
003:         *
004:         * This file is part of Resin(R) Open Source
005:         *
006:         * Each copy or derived work must preserve the copyright notice and this
007:         * notice unmodified.
008:         *
009:         * Resin Open Source is free software; you can redistribute it and/or modify
010:         * it under the terms of the GNU General Public License as published by
011:         * the Free Software Foundation; either version 2 of the License, or
012:         * (at your option) any later version.
013:         *
014:         * Resin Open Source is distributed in the hope that it will be useful,
015:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
016:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017:         * of NON-INFRINGEMENT.  See the GNU General Public License for more
018:         * details.
019:         *
020:         * You should have received a copy of the GNU General Public License
021:         * along with Resin Open Source; if not, write to the
022:         *
023:         *   Free Software Foundation, Inc.
024:         *   59 Temple Place, Suite 330
025:         *   Boston, MA 02111-1307  USA
026:         *
027:         * @author Scott Ferguson
028:         */
029:
030:        package com.caucho.amber.entity;
031:
032:        import com.caucho.amber.manager.AmberConnection;
033:        import com.caucho.util.Alarm;
034:
035:        import java.sql.SQLException;
036:        import java.util.Map;
037:
038:        /**
039:         * An entity item handles the living entities.
040:         */
041:        public class CacheableEntityItem extends EntityItem {
042:            private AmberEntityHome _home;
043:            private Entity _cacheEntity;
044:            private long _expireTime;
045:
046:            public CacheableEntityItem(AmberEntityHome home, Entity cacheEntity) {
047:                _home = home;
048:                _cacheEntity = cacheEntity;
049:
050:                // jpa/0w00
051:                cacheEntity.__caucho_setConnection(null);
052:
053:                if (cacheEntity.__caucho_getLoadMask(0) != 0)
054:                    _expireTime = Alarm.getCurrentTime()
055:                            + _home.getCacheTimeout();
056:            }
057:
058:            /**
059:             * Returns the entity home.
060:             */
061:            public AmberEntityHome getEntityHome() {
062:                return _home;
063:            }
064:
065:            /**
066:             * Returns the cached entity.
067:             *
068:             * @return true if the cached value is valid.
069:             */
070:            public Entity getEntity() {
071:                long now = Alarm.getCurrentTime();
072:
073:                if (_expireTime < now) {
074:                    long timeout = _home.getCacheTimeout();
075:
076:                    boolean isExpired = _expireTime > 0 && timeout > 0;
077:
078:                    _expireTime = now + timeout;
079:
080:                    if (isExpired)
081:                        _cacheEntity.__caucho_expire();
082:                }
083:
084:                return _cacheEntity;
085:            }
086:
087:            /**
088:             * Returns the cached entity.
089:             *
090:             * @return true if the cached value is valid.
091:             */
092:            public Entity loadEntity(int loadGroup) {
093:                long now = Alarm.getCurrentTime();
094:
095:                if (_expireTime < now) {
096:                    _expireTime = now + _home.getCacheTimeout();
097:                    _cacheEntity.__caucho_expire();
098:                }
099:
100:                AmberConnection aConn = _home.getManager().getCacheConnection();
101:
102:                try {
103:                    // _cacheEntity.__caucho_setConnection(aConn);
104:                    _cacheEntity.__caucho_retrieve_self(aConn);
105:                } finally {
106:                    aConn.freeConnection();
107:                }
108:
109:                return _cacheEntity;
110:            }
111:
112:            /**
113:             * Returns the cached entity.
114:             *
115:             * @return true if the cached value is valid.
116:             */
117:            public Entity loadEntity(AmberConnection aConn, int loadGroup) {
118:                long now = Alarm.getCurrentTime();
119:
120:                if (_expireTime < now) {
121:                    _expireTime = now + _home.getCacheTimeout();
122:                    _cacheEntity.__caucho_expire();
123:                }
124:
125:                try {
126:                    // jpa/0v33
127:                    // Prepared statements are cached per context so
128:                    // at this point, the cache item needs to use the
129:                    // context connection.
130:
131:                    // _cacheEntity.__caucho_setConnection(aConn);
132:                    _cacheEntity.__caucho_retrieve_self(aConn);
133:                } finally {
134:                    // After loading the entity, all prepared statements
135:                    // were properly cached into the context connection.
136:                    // Now make the cached entity item independent
137:                    // from any particular context.
138:                    _cacheEntity.__caucho_setConnection(null);
139:                }
140:
141:                return _cacheEntity;
142:            }
143:
144:            /**
145:             * Creates a bean instance
146:             */
147:            public Entity copy(AmberConnection aConn) {
148:                return _cacheEntity.__caucho_copy(aConn, this );
149:            }
150:
151:            /**
152:             * Creates a bean instance
153:             */
154:            public Entity copyTo(Entity targetEntity, AmberConnection aConn) {
155:                return _cacheEntity.__caucho_copyTo(targetEntity, aConn, this );
156:            }
157:
158:            /**
159:             * Creates a new entity instance.
160:             */
161:            @Override
162:            public Entity createEntity(AmberConnection aConn, Object key)
163:                    throws SQLException {
164:                Entity cacheEntity = getEntity();
165:                AmberEntityHome home = getEntityHome();
166:
167:                return cacheEntity.__caucho_home_new(home, key, aConn, this );
168:            }
169:
170:            /**
171:             * Saves the item values into the cache.
172:             */
173:            public void save(Entity item) {
174:                /*
175:                  long now = Alarm.getCurrentTime();
176:
177:                  synchronized (_cacheEntity) {
178:                  _expireTime = now + _home.getCacheTimeout();
179:
180:                  _cacheEntity.__caucho_loadFromObject(item);
181:                  }
182:                 */
183:            }
184:
185:            /**
186:             * Saves the item values into the cache.
187:             */
188:            public void savePart(Entity item) {
189:                /*
190:                  synchronized (_cacheEntity) {
191:                  _cacheEntity.__caucho_loadFromObject(item);
192:                  }
193:                 */
194:            }
195:
196:            /**
197:             * Expire the value from the cache.
198:             */
199:            @Override
200:            public void expire() {
201:                _cacheEntity.__caucho_expire();
202:            }
203:
204:            Class getInstanceClass() {
205:                return _cacheEntity.getClass();
206:            }
207:
208:            public String toString() {
209:                return "CacheableEntityItem[" + _cacheEntity + "]";
210:            }
211:        }
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