de.davidbilge.spring.remoting.amqp.client.AmqpProxyFactoryBean.java Source code

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Here is the source code for de.davidbilge.spring.remoting.amqp.client.AmqpProxyFactoryBean.java

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/*
 * Copyright 2002-2012 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 de.davidbilge.spring.remoting.amqp.client;

import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.aop.framework.ProxyFactory;
import org.springframework.beans.factory.BeanClassLoaderAware;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.remoting.rmi.RmiServiceExporter;

import de.davidbilge.spring.remoting.amqp.service.AmqpServiceMessageListener;

/**
 * {@link FactoryBean} for AMQP proxies. Exposes the proxied service for use as a bean reference, using the specified
 * service interface. Proxies will throw Spring's unchecked RemoteAccessException on remote invocation failure.
 * 
 * <p>
 * This is intended for an "RMI-style" (i.e. synchroneous) usage of the AMQP protocol. Obviously, AMQP allows for a much
 * broader scope of execution styles, which are not the scope of the mechanism at hand.
 * <p>
 * Calling a method on the proxy will cause an AMQP message being sent according to the configured {@link AmqpTemplate}.
 * This can be received and answered by an {@link AmqpServiceMessageListener}.
 * 
 * @author David Bilge
 * @since 13.04.2013
 * @see #setServiceInterface
 * @see AmqpClientInterceptor
 * @see RmiServiceExporter
 * @see org.springframework.remoting.RemoteAccessException
 */
public class AmqpProxyFactoryBean extends AmqpClientInterceptor
        implements FactoryBean<Object>, BeanClassLoaderAware, InitializingBean {

    private Object serviceProxy;

    @Override
    public void afterPropertiesSet() {
        if (getServiceInterface() == null) {
            throw new IllegalArgumentException("Property 'serviceInterface' is required");
        }
        this.serviceProxy = new ProxyFactory(getServiceInterface(), this).getProxy(getBeanClassLoader());
    }

    @Override
    public Object getObject() throws Exception {
        return this.serviceProxy;
    }

    @Override
    public Class<?> getObjectType() {
        return getServiceInterface();
    }

    @Override
    public boolean isSingleton() {
        return true;
    }

}