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Spring Framework example source code file (TransactionProxyFactoryBean.java)

This example Spring Framework source code file (TransactionProxyFactoryBean.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Spring Framework tags/keywords

abstractsingletonproxyfactorybean, beanfactoryaware, factorybean, listablebeanfactory, listablebeanfactory, object, object, platformtransactionmanager, platformtransactionmanager, pointcut, transactioninterceptor, transactioninterceptor, transactionproxyfactorybean, util

The Spring Framework TransactionProxyFactoryBean.java source code

/*
 * Copyright 2002-2006 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.interceptor;

import java.util.Properties;

import org.springframework.aop.Pointcut;
import org.springframework.aop.framework.AbstractSingletonProxyFactoryBean;
import org.springframework.aop.support.DefaultPointcutAdvisor;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.BeanFactoryUtils;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.ListableBeanFactory;
import org.springframework.transaction.PlatformTransactionManager;

/**
 * Proxy factory bean for simplified declarative transaction handling.
 * This is a convenient alternative to a standard AOP
 * {@link org.springframework.aop.framework.ProxyFactoryBean}
 * with a separate {@link TransactionInterceptor} definition.
 *
 * <p>This class is intended to cover the typical case of declarative
 * transaction demarcation: namely, wrapping a singleton target object with a
 * transactional proxy, proxying all the interfaces that the target implements.
 *
 * <p>There are three main properties that need to be specified:
 * <ul>
 * <li>"transactionManager": the {@link PlatformTransactionManager} implementation to use
 * (for example, a {@link org.springframework.transaction.jta.JtaTransactionManager} instance)
 * <li>"target": the target object that a transactional proxy should be created for
 * <li>"transactionAttributes": the transaction attributes (for example, propagation
 * behavior and "readOnly" flag) per target method name (or method name pattern)
 * </ul>
 *
 * <p>If the "transactionManager" property is not set explicitly and this {@link FactoryBean}
 * is running in a {@link ListableBeanFactory}, a single matching bean of type
 * {@link PlatformTransactionManager} will be fetched from the {@link BeanFactory}.
 *
 * <p>In contrast to {@link TransactionInterceptor}, the transaction attributes are
 * specified as properties, with method names as keys and transaction attribute
 * descriptors as values. Method names are always applied to the target class.
 *
 * <p>Internally, a {@link TransactionInterceptor} instance is used, but the user of this
 * class does not have to care. Optionally, a method pointcut can be specified
 * to cause conditional invocation of the underlying {@link TransactionInterceptor}.
 *
 * <p>The "preInterceptors" and "postInterceptors" properties can be set to add
 * additional interceptors to the mix, like
 * {@link org.springframework.aop.interceptor.PerformanceMonitorInterceptor} or
 * {@link org.springframework.orm.hibernate3.HibernateInterceptor} /
 * {@link org.springframework.orm.jdo.JdoInterceptor}.
 *
 * <p>HINT: This class is often used with parent / child bean definitions.
 * Typically, you will define the transaction manager and default transaction
 * attributes (for method name patterns) in an abstract parent bean definition,
 * deriving concrete child bean definitions for specific target objects.
 * This reduces the per-bean definition effort to a minimum.
 *
 * <pre code="class">
 * <bean id="baseTransactionProxy" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"
 *     abstract="true">
 *   <property name="transactionManager" ref="transactionManager"/>
 *   <property name="transactionAttributes">
 *     <props>
 *       <prop key="insert*">PROPAGATION_REQUIRED</prop>
 *       <prop key="update*">PROPAGATION_REQUIRED</prop>
 *       <prop key="*">PROPAGATION_REQUIRED,readOnly</prop>
 *     </props>
 *   </property>
 * </bean>
 *
 * <bean id="myProxy" parent="baseTransactionProxy">
 *   <property name="target" ref="myTarget"/>
 * </bean>
 *
 * <bean id="yourProxy" parent="baseTransactionProxy">
 *   <property name="target" ref="yourTarget"/>
 * </bean></pre>
 *
 * @author Juergen Hoeller
 * @author Dmitriy Kopylenko
 * @author Rod Johnson
 * @since 21.08.2003
 * @see #setTransactionManager
 * @see #setTarget
 * @see #setTransactionAttributes
 * @see TransactionInterceptor
 * @see org.springframework.aop.framework.ProxyFactoryBean
 */
public class TransactionProxyFactoryBean extends AbstractSingletonProxyFactoryBean
		implements FactoryBean, BeanFactoryAware {

	private final TransactionInterceptor transactionInterceptor = new TransactionInterceptor();

	private Pointcut pointcut;


	/**
	 * Set the transaction manager. This will perform actual
	 * transaction management: This class is just a way of invoking it.
	 * @see TransactionInterceptor#setTransactionManager
	 */
	public void setTransactionManager(PlatformTransactionManager transactionManager) {
		this.transactionInterceptor.setTransactionManager(transactionManager);
	}

	/**
	 * Set properties with method names as keys and transaction attribute
	 * descriptors (parsed via TransactionAttributeEditor) as values:
	 * e.g. key = "myMethod", value = "PROPAGATION_REQUIRED,readOnly".
	 * <p>Note: Method names are always applied to the target class,
	 * no matter if defined in an interface or the class itself.
	 * <p>Internally, a NameMatchTransactionAttributeSource will be
	 * created from the given properties.
	 * @see #setTransactionAttributeSource
	 * @see TransactionInterceptor#setTransactionAttributes
	 * @see TransactionAttributeEditor
	 * @see NameMatchTransactionAttributeSource
	 */
	public void setTransactionAttributes(Properties transactionAttributes) {
		this.transactionInterceptor.setTransactionAttributes(transactionAttributes);
	}

	/**
	 * Set the transaction attribute source which is used to find transaction
	 * attributes. If specifying a String property value, a PropertyEditor
	 * will create a MethodMapTransactionAttributeSource from the value.
	 * @see #setTransactionAttributes
	 * @see TransactionInterceptor#setTransactionAttributeSource
	 * @see TransactionAttributeSourceEditor
	 * @see MethodMapTransactionAttributeSource
	 * @see NameMatchTransactionAttributeSource
	 * @see AttributesTransactionAttributeSource
	 * @see org.springframework.transaction.annotation.AnnotationTransactionAttributeSource
	 */
	public void setTransactionAttributeSource(TransactionAttributeSource transactionAttributeSource) {
		this.transactionInterceptor.setTransactionAttributeSource(transactionAttributeSource);
	}

	/**
	 * Set a pointcut, i.e a bean that can cause conditional invocation
	 * of the TransactionInterceptor depending on method and attributes passed.
	 * Note: Additional interceptors are always invoked.
	 * @see #setPreInterceptors
	 * @see #setPostInterceptors
	 */
	public void setPointcut(Pointcut pointcut) {
		this.pointcut = pointcut;
	}

	/**
	 * This callback is optional: If running in a BeanFactory and no transaction
	 * manager has been set explicitly, a single matching bean of type
	 * PlatformTransactionManager will be fetched from the BeanFactory.
	 * @see org.springframework.beans.factory.BeanFactoryUtils#beanOfTypeIncludingAncestors
	 * @see org.springframework.transaction.PlatformTransactionManager
	 */
	public void setBeanFactory(BeanFactory beanFactory) {
		if (this.transactionInterceptor.getTransactionManager() == null &&
				beanFactory instanceof ListableBeanFactory) {
			ListableBeanFactory lbf = (ListableBeanFactory) beanFactory;
			PlatformTransactionManager ptm = (PlatformTransactionManager)
					BeanFactoryUtils.beanOfTypeIncludingAncestors(lbf, PlatformTransactionManager.class);
			this.transactionInterceptor.setTransactionManager(ptm);
		}
	}


	/**
	 * Creates an advisor for this FactoryBean's TransactionInterceptor.
	 */
	protected Object createMainInterceptor() {
		this.transactionInterceptor.afterPropertiesSet();
		if (this.pointcut != null) {
			return new DefaultPointcutAdvisor(this.pointcut, this.transactionInterceptor);
		}
		else {
			// Rely on default pointcut.
			return new TransactionAttributeSourceAdvisor(this.transactionInterceptor);
		}
	}

}

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