/*
 * Copyright 2002-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.transaction.config;

import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.lang.Nullable;
import org.springframework.transaction.jta.JtaTransactionManager;
import org.springframework.util.ClassUtils;

A FactoryBean equivalent to the <tx:jta-transaction-manager/> XML element, autodetecting WebLogic and WebSphere servers and exposing the corresponding JtaTransactionManager subclass.
Author:Juergen Hoeller
See Also:
Since:4.1.1
/** * A {@link FactoryBean} equivalent to the &lt;tx:jta-transaction-manager/&gt; XML element, * autodetecting WebLogic and WebSphere servers and exposing the corresponding * {@link org.springframework.transaction.jta.JtaTransactionManager} subclass. * * @author Juergen Hoeller * @since 4.1.1 * @see org.springframework.transaction.jta.WebLogicJtaTransactionManager * @see org.springframework.transaction.jta.WebSphereUowTransactionManager */
public class JtaTransactionManagerFactoryBean implements FactoryBean<JtaTransactionManager> { private static final String WEBLOGIC_JTA_TRANSACTION_MANAGER_CLASS_NAME = "org.springframework.transaction.jta.WebLogicJtaTransactionManager"; private static final String WEBSPHERE_TRANSACTION_MANAGER_CLASS_NAME = "org.springframework.transaction.jta.WebSphereUowTransactionManager"; private static final String JTA_TRANSACTION_MANAGER_CLASS_NAME = "org.springframework.transaction.jta.JtaTransactionManager"; private static final boolean weblogicPresent; private static final boolean webspherePresent; static { ClassLoader classLoader = JtaTransactionManagerFactoryBean.class.getClassLoader(); weblogicPresent = ClassUtils.isPresent("weblogic.transaction.UserTransaction", classLoader); webspherePresent = ClassUtils.isPresent("com.ibm.wsspi.uow.UOWManager", classLoader); } @Nullable private final JtaTransactionManager transactionManager; @SuppressWarnings("unchecked") public JtaTransactionManagerFactoryBean() { String className = resolveJtaTransactionManagerClassName(); try { Class<? extends JtaTransactionManager> clazz = (Class<? extends JtaTransactionManager>) ClassUtils.forName(className, JtaTransactionManagerFactoryBean.class.getClassLoader()); this.transactionManager = BeanUtils.instantiateClass(clazz); } catch (ClassNotFoundException ex) { throw new IllegalStateException("Failed to load JtaTransactionManager class: " + className, ex); } } @Override @Nullable public JtaTransactionManager getObject() { return this.transactionManager; } @Override public Class<?> getObjectType() { return (this.transactionManager != null ? this.transactionManager.getClass() : JtaTransactionManager.class); } @Override public boolean isSingleton() { return true; } static String resolveJtaTransactionManagerClassName() { if (weblogicPresent) { return WEBLOGIC_JTA_TRANSACTION_MANAGER_CLASS_NAME; } else if (webspherePresent) { return WEBSPHERE_TRANSACTION_MANAGER_CLASS_NAME; } else { return JTA_TRANSACTION_MANAGER_CLASS_NAME; } } }