Source Code Cross Referenced for ConnectionFactoryUtils.java in  » J2EE » spring-framework-2.5 » org » springframework » jca » cci » connection » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.jca.cci.connection 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2007 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.springframework.jca.cci.connection;
018:
019:        import javax.resource.ResourceException;
020:        import javax.resource.cci.Connection;
021:        import javax.resource.cci.ConnectionFactory;
022:        import javax.resource.cci.ConnectionSpec;
023:
024:        import org.apache.commons.logging.Log;
025:        import org.apache.commons.logging.LogFactory;
026:
027:        import org.springframework.jca.cci.CannotGetCciConnectionException;
028:        import org.springframework.transaction.support.TransactionSynchronizationAdapter;
029:        import org.springframework.transaction.support.TransactionSynchronizationManager;
030:        import org.springframework.util.Assert;
031:
032:        /**
033:         * Helper class that provides static methods for obtaining CCI Connections
034:         * from a {@link javax.resource.cci.ConnectionFactory}. Includes special
035:         * support for Spring-managed transactional Connections, e.g. managed
036:         * by {@link CciLocalTransactionManager} or
037:         * {@link org.springframework.transaction.jta.JtaTransactionManager}.
038:         *
039:         * <p>Used internally by {@link org.springframework.jca.cci.core.CciTemplate},
040:         * Spring's CCI operation objects and the {@link CciLocalTransactionManager}.
041:         * Can also be used directly in application code.
042:         *
043:         * @author Thierry Templier
044:         * @author Juergen Hoeller
045:         * @since 1.2
046:         * @see #getConnection
047:         * @see #releaseConnection
048:         * @see CciLocalTransactionManager
049:         * @see org.springframework.transaction.jta.JtaTransactionManager
050:         * @see org.springframework.transaction.support.TransactionSynchronizationManager
051:         */
052:        public abstract class ConnectionFactoryUtils {
053:
054:            private static final Log logger = LogFactory
055:                    .getLog(ConnectionFactoryUtils.class);
056:
057:            /**
058:             * Obtain a Connection from the given ConnectionFactory. Translates ResourceExceptions
059:             * into the Spring hierarchy of unchecked generic data access exceptions, simplifying
060:             * calling code and making any exception that is thrown more meaningful.
061:             * <p>Is aware of a corresponding Connection bound to the current thread, for example
062:             * when using {@link CciLocalTransactionManager}. Will bind a Connection to the thread
063:             * if transaction synchronization is active (e.g. if in a JTA transaction).
064:             * @param cf the ConnectionFactory to obtain Connection from
065:             * @return a CCI Connection from the given ConnectionFactory
066:             * @throws org.springframework.jca.cci.CannotGetCciConnectionException
067:             * if the attempt to get a Connection failed
068:             * @see #releaseConnection
069:             */
070:            public static Connection getConnection(ConnectionFactory cf)
071:                    throws CannotGetCciConnectionException {
072:                return getConnection(cf, null);
073:            }
074:
075:            /**
076:             * Obtain a Connection from the given ConnectionFactory. Translates ResourceExceptions
077:             * into the Spring hierarchy of unchecked generic data access exceptions, simplifying
078:             * calling code and making any exception that is thrown more meaningful.
079:             * <p>Is aware of a corresponding Connection bound to the current thread, for example
080:             * when using {@link CciLocalTransactionManager}. Will bind a Connection to the thread
081:             * if transaction synchronization is active (e.g. if in a JTA transaction).
082:             * @param cf the ConnectionFactory to obtain Connection from
083:             * @param spec the ConnectionSpec for the desired Connection (may be <code>null</code>).
084:             * Note: If this is specified, a new Connection will be obtained for every call,
085:             * without participating in a shared transactional Connection.
086:             * @return a CCI Connection from the given ConnectionFactory
087:             * @throws org.springframework.jca.cci.CannotGetCciConnectionException
088:             * if the attempt to get a Connection failed
089:             * @see #releaseConnection
090:             */
091:            public static Connection getConnection(ConnectionFactory cf,
092:                    ConnectionSpec spec) throws CannotGetCciConnectionException {
093:                try {
094:                    if (spec != null) {
095:                        Assert.notNull(cf, "No ConnectionFactory specified");
096:                        return cf.getConnection(spec);
097:                    } else {
098:                        return doGetConnection(cf);
099:                    }
100:                } catch (ResourceException ex) {
101:                    throw new CannotGetCciConnectionException(
102:                            "Could not get CCI Connection", ex);
103:                }
104:            }
105:
106:            /**
107:             * Actually obtain a CCI Connection from the given ConnectionFactory.
108:             * Same as {@link #getConnection}, but throwing the original ResourceException.
109:             * <p>Is aware of a corresponding Connection bound to the current thread, for example
110:             * when using {@link CciLocalTransactionManager}. Will bind a Connection to the thread
111:             * if transaction synchronization is active (e.g. if in a JTA transaction).
112:             * <p>Directly accessed by {@link TransactionAwareConnectionFactoryProxy}.
113:             * @param cf the ConnectionFactory to obtain Connection from
114:             * @return a CCI Connection from the given ConnectionFactory
115:             * @throws ResourceException if thrown by CCI API methods
116:             * @see #doReleaseConnection
117:             */
118:            public static Connection doGetConnection(ConnectionFactory cf)
119:                    throws ResourceException {
120:                Assert.notNull(cf, "No ConnectionFactory specified");
121:
122:                ConnectionHolder conHolder = (ConnectionHolder) TransactionSynchronizationManager
123:                        .getResource(cf);
124:                if (conHolder != null) {
125:                    return conHolder.getConnection();
126:                }
127:
128:                logger.debug("Opening CCI Connection");
129:                Connection con = cf.getConnection();
130:
131:                if (TransactionSynchronizationManager.isSynchronizationActive()) {
132:                    logger
133:                            .debug("Registering transaction synchronization for CCI Connection");
134:                    conHolder = new ConnectionHolder(con);
135:                    conHolder.setSynchronizedWithTransaction(true);
136:                    TransactionSynchronizationManager
137:                            .registerSynchronization(new ConnectionSynchronization(
138:                                    conHolder, cf));
139:                    TransactionSynchronizationManager.bindResource(cf,
140:                            conHolder);
141:                }
142:
143:                return con;
144:            }
145:
146:            /**
147:             * Determine whether the given JCA CCI Connection is transactional, that is,
148:             * bound to the current thread by Spring's transaction facilities.
149:             * @param con the Connection to check
150:             * @param cf the ConnectionFactory that the Connection was obtained from
151:             * (may be <code>null</code>)
152:             * @return whether the Connection is transactional
153:             */
154:            public static boolean isConnectionTransactional(Connection con,
155:                    ConnectionFactory cf) {
156:                if (cf == null) {
157:                    return false;
158:                }
159:                ConnectionHolder conHolder = (ConnectionHolder) TransactionSynchronizationManager
160:                        .getResource(cf);
161:                return (conHolder != null && conHolder.getConnection() == con);
162:            }
163:
164:            /**
165:             * Close the given Connection, obtained from the given ConnectionFactory,
166:             * if it is not managed externally (that is, not bound to the thread).
167:             * @param con the Connection to close if necessary
168:             * (if this is <code>null</code>, the call will be ignored)
169:             * @param cf the ConnectionFactory that the Connection was obtained from
170:             * (can be <code>null</code>)
171:             * @see #getConnection
172:             */
173:            public static void releaseConnection(Connection con,
174:                    ConnectionFactory cf) {
175:                try {
176:                    doReleaseConnection(con, cf);
177:                } catch (ResourceException ex) {
178:                    logger.debug("Could not close CCI Connection", ex);
179:                } catch (Throwable ex) {
180:                    // We don't trust the CCI driver: It might throw RuntimeException or Error.
181:                    logger.debug(
182:                            "Unexpected exception on closing CCI Connection",
183:                            ex);
184:                }
185:            }
186:
187:            /**
188:             * Actually close the given Connection, obtained from the given ConnectionFactory.
189:             * Same as {@link #releaseConnection}, but throwing the original ResourceException.
190:             * <p>Directly accessed by {@link TransactionAwareConnectionFactoryProxy}.
191:             * @param con the Connection to close if necessary
192:             * (if this is <code>null</code>, the call will be ignored)
193:             * @param cf the ConnectionFactory that the Connection was obtained from
194:             * (can be <code>null</code>)
195:             * @throws ResourceException if thrown by JCA CCI methods
196:             * @see #doGetConnection
197:             */
198:            public static void doReleaseConnection(Connection con,
199:                    ConnectionFactory cf) throws ResourceException {
200:                if (con == null || isConnectionTransactional(con, cf)) {
201:                    return;
202:                }
203:                con.close();
204:            }
205:
206:            /**
207:             * Callback for resource cleanup at the end of a non-native CCI transaction
208:             * (e.g. when participating in a JTA transaction).
209:             */
210:            private static class ConnectionSynchronization extends
211:                    TransactionSynchronizationAdapter {
212:
213:                private final ConnectionHolder connectionHolder;
214:
215:                private final ConnectionFactory connectionFactory;
216:
217:                private boolean holderActive = true;
218:
219:                public ConnectionSynchronization(
220:                        ConnectionHolder connectionHolder,
221:                        ConnectionFactory connectionFactory) {
222:                    this .connectionHolder = connectionHolder;
223:                    this .connectionFactory = connectionFactory;
224:                }
225:
226:                public void suspend() {
227:                    if (this .holderActive) {
228:                        TransactionSynchronizationManager
229:                                .unbindResource(this .connectionFactory);
230:                    }
231:                }
232:
233:                public void resume() {
234:                    if (this .holderActive) {
235:                        TransactionSynchronizationManager.bindResource(
236:                                this .connectionFactory, this .connectionHolder);
237:                    }
238:                }
239:
240:                public void beforeCompletion() {
241:                    TransactionSynchronizationManager
242:                            .unbindResource(this .connectionFactory);
243:                    this .holderActive = false;
244:                    releaseConnection(this.connectionHolder.getConnection(),
245:                            this.connectionFactory);
246:                }
247:            }
248:
249:        }
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