Source Code Cross Referenced for EclipseLinkHelper.java in  » Search-Engine » compass-2.0 » org » compass » gps » device » jpa » embedded » eclipselink » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Search Engine » compass 2.0 » org.compass.gps.device.jpa.embedded.eclipselink 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2004-2006 the original author or authors.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.compass.gps.device.jpa.embedded.eclipselink;
018:
019:        import java.util.Properties;
020:        import java.util.Vector;
021:        import javax.persistence.EntityManager;
022:        import javax.persistence.EntityManagerFactory;
023:
024:        import org.compass.core.Compass;
025:        import org.compass.core.CompassException;
026:        import org.compass.core.CompassSession;
027:        import org.compass.gps.device.jpa.JpaGpsDevice;
028:        import org.compass.gps.device.jpa.embedded.DefaultJpaCompassGps;
029:        import org.compass.gps.device.jpa.embedded.JpaCompassGps;
030:        import org.eclipse.persistence.jpa.JpaEntityManager;
031:        import org.eclipse.persistence.sessions.Session;
032:
033:        /**
034:         * Helper class to get different Compass constructs embedded with EclipseLink.
035:         *
036:         * @author kimchy
037:         */
038:        public abstract class EclipseLinkHelper {
039:
040:            private EclipseLinkHelper() {
041:
042:            }
043:
044:            /**
045:             * Returns the Compass instance assoicated with the given EclipseLink {@link javax.persistence.EntityManagerFactory}.
046:             * This allows to get a Compass instnace in order to perform search operations for example outside of a JPA
047:             * transaction (for performance reasons, mostly there is no need to start a DB transaction).
048:             */
049:            public static Compass getCompass(EntityManagerFactory emf) {
050:                EntityManager em = emf.createEntityManager();
051:                try {
052:                    return getCompass(em);
053:                } finally {
054:                    em.close();
055:                }
056:            }
057:
058:            /**
059:             * Returns the Compass instance assoicated with the given EclispeLink {@link javax.persistence.EntityManager}.
060:             * This allows to get a Compass instnace in order to perform search operations for example outside of a JPA
061:             * transaction (for performance reasons, mostly there is no need to start a DB transaction).
062:             */
063:            public static Compass getCompass(EntityManager em) {
064:                return findCompassSessionEventListener(em).getCompass();
065:            }
066:
067:            /**
068:             * Returns the index settings that are configured within the {@link javax.persistence.EntityManagerFactory}
069:             * configuration. Can be used to configure exteranally a {@link org.compass.gps.device.jpa.embedded.JpaCompassGps}
070:             * instance.
071:             */
072:            public static Properties getIndexSettings(EntityManagerFactory emf) {
073:                EntityManager em = emf.createEntityManager();
074:                try {
075:                    return getIndexSettings(em);
076:                } finally {
077:                    em.close();
078:                }
079:            }
080:
081:            /**
082:             * Returns the index settings that are configured within the {@link javax.persistence.EntityManager}
083:             * configuration. Can be used to configure exteranally a {@link org.compass.gps.device.jpa.embedded.JpaCompassGps}
084:             * instnace.
085:             */
086:            public static Properties getIndexSettings(EntityManager em) {
087:                return findCompassSessionEventListener(em).getIndexSettings();
088:            }
089:
090:            /**
091:             * Returns the current Compass session associated with the {@link javax.persistence.EntityManager}.
092:             * Compass Session is associated with an Entity Manager when a transaction is started and removed when the
093:             * transaction commits/rollsback.
094:             *
095:             * <p>The session can be used to perform searches that needs to take into account current transactional changes
096:             * or to perform additional Compass operations that are not reflected by the mirroring feature.
097:             */
098:            public static CompassSession getCurrentCompassSession(
099:                    EntityManager em) {
100:                Session serverSession = ((JpaEntityManager) em)
101:                        .getServerSession();
102:                Session session = ((JpaEntityManager) em).getUnitOfWork();
103:                return findCompassSessionEventListener(serverSession)
104:                        .getCurrentCompassSession(session);
105:            }
106:
107:            /**
108:             * Returns the current Compass session associated with the {@link javax.persistence.EntityManager}.
109:             * Compass Session is associated with an Entity Manager when a transaction is started and removed when the
110:             * transaction commits/rollsback.
111:             *
112:             * <p>The session can be used to perform searches that needs to take into account current transactional changes
113:             * or to perform additional Compass operations that are not reflected by the mirroring feature.
114:             */
115:            public static CompassSession getCurrentCompassSession(
116:                    Session session) {
117:                return findCompassSessionEventListener(session)
118:                        .getCurrentCompassSession(session);
119:            }
120:
121:            /**
122:             * Returns the Compass Gps instance associated with the given EclipseLink {@link javax.persistence.EntityManagerFactory}.
123:             * Used in order to perform {@link org.compass.gps.device.jpa.embedded.JpaCompassGps#index()} operation. Note, the index
124:             * operation should not be perfomed within a running transaction.
125:             */
126:            public static JpaCompassGps getCompassGps(EntityManagerFactory emf) {
127:                EntityManager em = emf.createEntityManager();
128:                try {
129:                    return getCompassGps(em);
130:                } finally {
131:                    em.close();
132:                }
133:            }
134:
135:            /**
136:             * Returns the Compass Gps instance associated with the given EclipseLink {@link javax.persistence.EntityManager}.
137:             * Used in order to perform {@link org.compass.gps.device.jpa.embedded.JpaCompassGps#index()} operation. Note, the index
138:             * operation should not be perfomed within a running transaction.
139:             */
140:            public static JpaCompassGps getCompassGps(EntityManager em) {
141:                return findCompassSessionEventListener(em).getJpaCompassGps();
142:            }
143:
144:            /**
145:             * A helper class to create the <code>JpaCompasGps</code> based on the passed device.
146:             */
147:            public static JpaCompassGps createCompassGps(JpaGpsDevice device) {
148:                DefaultJpaCompassGps gps = new DefaultJpaCompassGps(
149:                        getCompass(device.getEntityManagerFactory()));
150:                device.setMirrorDataChanges(false);
151:                gps.setIndexProperties(getIndexSettings(device
152:                        .getEntityManagerFactory()));
153:                gps.addGpsDevice(device);
154:                return gps;
155:            }
156:
157:            private static CompassSessionEventListener findCompassSessionEventListener(
158:                    EntityManager em) throws CompassException {
159:                return findCompassSessionEventListener(((JpaEntityManager) em)
160:                        .getServerSession());
161:            }
162:
163:            private static CompassSessionEventListener findCompassSessionEventListener(
164:                    Session session) throws CompassException {
165:                Vector listeners = session.getEventManager().getListeners();
166:                for (Object o : listeners) {
167:                    if (o instanceof  CompassSessionEventListener) {
168:                        return (CompassSessionEventListener) o;
169:                    }
170:                }
171:                throw new CompassException(
172:                        "Failed to find CompassSessionEventListener, have you configured Compass with EclipseLink?");
173:            }
174:        }
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