JtaTransactionManagerFactoryBean as an equivalent to <tx:jta-transaction-manager/>

Issue: SPR-12197

Author: jhoeller

spring-tx/src/main/java/org/springframework/transaction/config/JtaTransactionManagerBeanDefinitionParser.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2013 the original author or authors.
+ * Copyright 2002-2014 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.
@@ -21,46 +21,23 @@
 import org.springframework.beans.factory.support.AbstractBeanDefinition;
 import org.springframework.beans.factory.xml.AbstractSingleBeanDefinitionParser;
 import org.springframework.beans.factory.xml.ParserContext;
-import org.springframework.util.ClassUtils;
 
 /**
- * Parser for the <tx:jta-transaction-manager/> element,
- * autodetecting BEA WebLogic and IBM WebSphere.
+ * Parser for the <tx:jta-transaction-manager/> XML configuration element,
+ * autodetecting WebLogic and WebSphere servers and exposing the corresponding
+ * {@link org.springframework.transaction.jta.JtaTransactionManager} subclass.
  *
  * @author Juergen Hoeller
  * @author Christian Dupuis
  * @since 2.5
+ * @see org.springframework.transaction.jta.WebLogicJtaTransactionManager
+ * @see org.springframework.transaction.jta.WebSphereUowTransactionManager
  */
 public class JtaTransactionManagerBeanDefinitionParser extends AbstractSingleBeanDefinitionParser  {
 
-	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 = ClassUtils.isPresent(
-			"weblogic.transaction.UserTransaction", JtaTransactionManagerBeanDefinitionParser.class.getClassLoader());
-
-	private static final boolean webspherePresent = ClassUtils.isPresent(
-			"com.ibm.wsspi.uow.UOWManager", JtaTransactionManagerBeanDefinitionParser.class.getClassLoader());
-
-
 	@Override
 	protected String getBeanClassName(Element element) {
-		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;
-		}
+		return JtaTransactionManagerFactoryBean.resolveJtaTransactionManagerClassName();
 	}
 
 	@Override

spring-tx/src/main/java/org/springframework/transaction/config/JtaTransactionManagerFactoryBean.java

@@ -0,0 +1,98 @@
+/*
+ * Copyright 2002-2014 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.transaction.jta.JtaTransactionManager;
+import org.springframework.util.ClassUtils;
+
+/**
+ * A {@link FactoryBean} equivalent to the <tx:jta-transaction-manager/> 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 = ClassUtils.isPresent(
+			"weblogic.transaction.UserTransaction", JtaTransactionManagerFactoryBean.class.getClassLoader());
+
+	private static final boolean webspherePresent = ClassUtils.isPresent(
+			"com.ibm.wsspi.uow.UOWManager", JtaTransactionManagerFactoryBean.class.getClassLoader());
+
+
+	private final JtaTransactionManager transactionManager;
+
+
+	@SuppressWarnings("unchecked")
+	public JtaTransactionManagerFactoryBean() {
+		String className = resolveJtaTransactionManagerClassName();
+		try {
+			Class<? extends JtaTransactionManager> clazz = (Class<? extends JtaTransactionManager>)
+					JtaTransactionManagerFactoryBean.class.getClassLoader().loadClass(className);
+			this.transactionManager = BeanUtils.instantiate(clazz);
+		}
+		catch (ClassNotFoundException ex) {
+			throw new IllegalStateException("Failed to load JtaTransactionManager class: " + className, ex);
+		}
+	}
+
+
+	@Override
+	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;
+		}
+	}
+
+}