org.springframework.transaction.interceptor.TransactionInterceptor.java Source code

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Here is the source code for org.springframework.transaction.interceptor.TransactionInterceptor.java

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/*
 * Copyright 2002-2019 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
 *
 *      https://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.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Properties;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;

import org.springframework.aop.support.AopUtils;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.lang.Nullable;
import org.springframework.transaction.PlatformTransactionManager;

/**
 * AOP Alliance MethodInterceptor for declarative transaction
 * management using the common Spring transaction infrastructure
 * ({@link org.springframework.transaction.PlatformTransactionManager}/
 * {@link org.springframework.transaction.ReactiveTransactionManager}).
 *
 * <p>Derives from the {@link TransactionAspectSupport} class which
 * contains the integration with Spring's underlying transaction API.
 * TransactionInterceptor simply calls the relevant superclass methods
 * such as {@link #invokeWithinTransaction} in the correct order.
 *
 * <p>TransactionInterceptors are thread-safe.
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @see TransactionProxyFactoryBean
 * @see org.springframework.aop.framework.ProxyFactoryBean
 * @see org.springframework.aop.framework.ProxyFactory
 */
@SuppressWarnings("serial")
public class TransactionInterceptor extends TransactionAspectSupport implements MethodInterceptor, Serializable {

    /**
     * Create a new TransactionInterceptor.
     * <p>Transaction manager and transaction attributes still need to be set.
     * @see #setTransactionManager
     * @see #setTransactionAttributes(java.util.Properties)
     * @see #setTransactionAttributeSource(TransactionAttributeSource)
     */
    public TransactionInterceptor() {
    }

    /**
     * Create a new TransactionInterceptor.
     * @param ptm the default transaction manager to perform the actual transaction management
     * @param attributes the transaction attributes in properties format
     * @see #setTransactionManager
     * @see #setTransactionAttributes(java.util.Properties)
     */
    public TransactionInterceptor(PlatformTransactionManager ptm, Properties attributes) {
        setTransactionManager(ptm);
        setTransactionAttributes(attributes);
    }

    /**
     * Create a new TransactionInterceptor.
     * @param ptm the default transaction manager to perform the actual transaction management
     * @param tas the attribute source to be used to find transaction attributes
     * @see #setTransactionManager
     * @see #setTransactionAttributeSource(TransactionAttributeSource)
     */
    public TransactionInterceptor(PlatformTransactionManager ptm, TransactionAttributeSource tas) {
        setTransactionManager(ptm);
        setTransactionAttributeSource(tas);
    }

    @Override
    @Nullable
    public Object invoke(MethodInvocation invocation) throws Throwable {
        // Work out the target class: may be {@code null}.
        // The TransactionAttributeSource should be passed the target class
        // as well as the method, which may be from an interface.
        Class<?> targetClass = (invocation.getThis() != null ? AopUtils.getTargetClass(invocation.getThis())
                : null);

        // Adapt to TransactionAspectSupport's invokeWithinTransaction...
        return invokeWithinTransaction(invocation.getMethod(), targetClass, invocation::proceed);
    }

    //---------------------------------------------------------------------
    // Serialization support
    //---------------------------------------------------------------------

    private void writeObject(ObjectOutputStream oos) throws IOException {
        // Rely on default serialization, although this class itself doesn't carry state anyway...
        oos.defaultWriteObject();

        // Deserialize superclass fields.
        oos.writeObject(getTransactionManagerBeanName());
        oos.writeObject(getTransactionManager());
        oos.writeObject(getTransactionAttributeSource());
        oos.writeObject(getBeanFactory());
    }

    private void readObject(ObjectInputStream ois) throws IOException, ClassNotFoundException {
        // Rely on default serialization, although this class itself doesn't carry state anyway...
        ois.defaultReadObject();

        // Serialize all relevant superclass fields.
        // Superclass can't implement Serializable because it also serves as base class
        // for AspectJ aspects (which are not allowed to implement Serializable)!
        setTransactionManagerBeanName((String) ois.readObject());
        setTransactionManager((PlatformTransactionManager) ois.readObject());
        setTransactionAttributeSource((TransactionAttributeSource) ois.readObject());
        setBeanFactory((BeanFactory) ois.readObject());
    }

}