Source Code Cross Referenced for JotmFactoryBean.java in  » J2EE » spring-framework-2.0.6 » org » springframework » transaction » jta » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.transaction.jta 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2006 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.springframework.transaction.jta;
018:
019:        import javax.naming.NamingException;
020:
021:        import org.objectweb.jotm.Current;
022:        import org.objectweb.jotm.Jotm;
023:
024:        import org.springframework.beans.factory.DisposableBean;
025:        import org.springframework.beans.factory.FactoryBean;
026:
027:        /**
028:         * FactoryBean that retrieves the JTA UserTransaction/TransactionManager for
029:         * ObjectWeb's <a href="http://jotm.objectweb.org">JOTM</a>. Will retrieve
030:         * an already active JOTM instance if found (e.g. if running in JOnAS),
031:         * else create a new local JOTM instance.
032:         *
033:         * <p>With JOTM, the same object implements both the
034:         * {@link javax.transaction.UserTransaction} and the
035:         * {@link javax.transaction.TransactionManager} interface,
036:         * as returned by this FactoryBean.
037:         *
038:         * <p>A local JOTM instance is well-suited for working in conjunction with
039:         * ObjectWeb's <a href="http://xapool.experlog.com">XAPool</a>, e.g. with bean
040:         * definitions like the following:
041:         *
042:         * <pre class="code">
043:         * &lt;bean id="jotm" class="org.springframework.transaction.jta.JotmFactoryBean"/&gt;
044:         *
045:         * &lt;bean id="transactionManager" class="org.springframework.transaction.jta.JtaTransactionManager"&gt;
046:         *   &lt;property name="userTransaction" ref="jotm"/&gt;
047:         * &lt;/bean&gt;
048:         *
049:         * &lt;bean id="innerDataSource" class="org.enhydra.jdbc.standard.StandardXADataSource" destroy-method="shutdown"&gt;
050:         *   &lt;property name="transactionManager" ref="jotm"/&gt;
051:         *   &lt;property name="driverName" value="..."/&gt;
052:         *   &lt;property name="url" value="..."/&gt;
053:         *   &lt;property name="user" value="..."/&gt;
054:         *   &lt;property name="password" value="..."/&gt;
055:         * &lt;/bean&gt;
056:         *
057:         * &lt;bean id="dataSource" class="org.enhydra.jdbc.pool.StandardXAPoolDataSource" destroy-method="shutdown"&gt;
058:         *   &lt;property name="dataSource" ref="innerDataSource"/&gt;
059:         *   &lt;property name="user" value="..."/&gt;
060:         *   &lt;property name="password" value="..."/&gt;
061:         *   &lt;property name="maxSize" value="..."/&gt;
062:         * &lt;/bean&gt;</pre>
063:         *
064:         * Note that Spring's {@link JtaTransactionManager} will automatically detect
065:         * that the passed-in UserTransaction reference also implements the
066:         * TransactionManager interface. Hence, it is not necessary to specify a
067:         * separate reference for JtaTransactionManager's "transactionManager" property.
068:         *
069:         * <p>Implementation note: This FactoryBean uses JOTM's static access method
070:         * to obtain the JOTM {@link org.objectweb.jotm.Current} object, which
071:         * implements both the UserTransaction and the TransactionManager interface,
072:         * as mentioned above.
073:         *
074:         * @author Juergen Hoeller
075:         * @since 21.01.2004
076:         * @see JtaTransactionManager#setUserTransaction
077:         * @see JtaTransactionManager#setTransactionManager
078:         * @see org.objectweb.jotm.Current
079:         */
080:        public class JotmFactoryBean implements  FactoryBean, DisposableBean {
081:
082:            private Current jotmCurrent;
083:
084:            private Jotm jotm;
085:
086:            public JotmFactoryBean() throws NamingException {
087:                // Check for already active JOTM instance.
088:                this .jotmCurrent = Current.getCurrent();
089:
090:                // If none found, create new local JOTM instance.
091:                if (this .jotmCurrent == null) {
092:                    // Only for use within the current Spring context:
093:                    // local, not bound to registry.
094:                    this .jotm = new Jotm(true, false);
095:                    this .jotmCurrent = Current.getCurrent();
096:                }
097:            }
098:
099:            /**
100:             * Set the default transaction timeout for the JOTM instance.
101:             * <p>Should only be called for a local JOTM instance,
102:             * not when accessing an existing (shared) JOTM instance.
103:             */
104:            public void setDefaultTimeout(int defaultTimeout) {
105:                this .jotmCurrent.setDefaultTimeout(defaultTimeout);
106:            }
107:
108:            /**
109:             * Return the JOTM instance created by this factory bean, if any.
110:             * Will be <code>null</code> if an already active JOTM instance is used.
111:             * <p>Application code should never need to access this.
112:             */
113:            public Jotm getJotm() {
114:                return this .jotm;
115:            }
116:
117:            public Object getObject() {
118:                return this .jotmCurrent;
119:            }
120:
121:            public Class getObjectType() {
122:                return this .jotmCurrent.getClass();
123:            }
124:
125:            public boolean isSingleton() {
126:                return true;
127:            }
128:
129:            /**
130:             * Stop the local JOTM instance, if created by this FactoryBean.
131:             */
132:            public void destroy() {
133:                if (this.jotm != null) {
134:                    this.jotm.stop();
135:                }
136:            }
137:
138:        }
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