Package org.cometd.annotation.spring

Source Code of org.cometd.annotation.spring.Configurator

/*
* Copyright (c) 2008-2014 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.cometd.annotation.spring;

import javax.annotation.PostConstruct;
import javax.inject.Inject;

import org.cometd.annotation.ServerAnnotationProcessor;
import org.cometd.bayeux.server.BayeuxServer;
import org.cometd.server.BayeuxServerImpl;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.DestructionAwareBeanPostProcessor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
* The Spring component that configures CometD services.
*
* Spring scans the classes and finds this class annotated with Spring's @Configuration
* annotation, and makes an instance. Then it notices that it has a bean factory
* method (annotated with @Bean) that produces the BayeuxServer instance.
* Note that, as per Spring documentation, this class is subclassed by Spring
* via CGLIB to invoke bean factory methods only once.
*
* Implementing {@link DestructionAwareBeanPostProcessor} allows to plug-in
* CometD's annotation processor to process the CometD services.
*/
@Configuration
public class Configurator implements DestructionAwareBeanPostProcessor
{
    private BayeuxServer bayeuxServer;
    private ServerAnnotationProcessor processor;

    @Inject
    private void setBayeuxServer(BayeuxServer bayeuxServer)
    {
        this.bayeuxServer = bayeuxServer;
    }

    @PostConstruct
    private void init()
    {
        this.processor = new ServerAnnotationProcessor(bayeuxServer);
    }

    @Override
    public Object postProcessBeforeInitialization(Object bean, String name) throws BeansException
    {
        processor.processDependencies(bean);
        processor.processConfigurations(bean);
        processor.processCallbacks(bean);
        return bean;
    }

    @Override
    public Object postProcessAfterInitialization(Object bean, String name) throws BeansException
    {
        return bean;
    }

    @Override
    public void postProcessBeforeDestruction(Object bean, String name) throws BeansException
    {
        processor.deprocessCallbacks(bean);
    }

    @Bean(initMethod = "start", destroyMethod = "stop")
    public BayeuxServer bayeuxServer()
    {
        return new BayeuxServerImpl();
    }
}
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