com.github.tddts.jet.config.spring.postprocessor.EventBusBeanPostProcessor.java Source code

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Here is the source code for com.github.tddts.jet.config.spring.postprocessor.EventBusBeanPostProcessor.java

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/*
 * Copyright 2018 Tigran Dadaiants
 *
 * 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 com.github.tddts.jet.config.spring.postprocessor;

import com.github.tddts.jet.util.SpringUtil;
import com.google.common.eventbus.EventBus;
import com.google.common.eventbus.Subscribe;
import org.apache.commons.lang3.tuple.Pair;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.config.BeanPostProcessor;

import java.lang.reflect.Method;

/**
 * {@code EventBusBeanPostProcessor} is {@link BeanPostProcessor} that registers beans to {@link EventBus} if they
 * have methods marked with {@link Subscribe} annotation.
 *
 * @author Tigran_Dadaiants dtkcommon@gmail.com
 */
public class EventBusBeanPostProcessor implements BeanPostProcessor {

    private final Logger logger = LogManager.getLogger(EventBusBeanPostProcessor.class);

    @Autowired
    private EventBus eventBus;

    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {

        Pair<Class<?>, Object> typeObjectPair = SpringUtil.checkForDinamicProxy(bean);
        Class<?> type = typeObjectPair.getLeft();
        Object target = typeObjectPair.getRight();

        for (Method method : type.getDeclaredMethods()) {

            if (method.isAnnotationPresent(Subscribe.class)) {
                eventBus.register(target);
                logger.debug("Bean registered to EventBus: [" + beanName + "]");
                return bean;
            }
        }
        return bean;
    }

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

}