com.kurento.kmf.jsonrpcconnector.internal.server.BeanCreatingHelper.java Source code

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Here is the source code for com.kurento.kmf.jsonrpcconnector.internal.server.BeanCreatingHelper.java

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/*
 * Copyright 2002-2013 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 com.kurento.kmf.jsonrpcconnector.internal.server;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.config.AutowireCapableBeanFactory;

/**
 * Instantiates a target handler through a Spring {@link BeanFactory} and also
 * provides an equivalent destroy method. Mainly for internal use to assist with
 * initializing and destroying handlers with per-connection lifecycle.
 * 
 * @author Rossen Stoyanchev
 * @since 4.0
 */
public class BeanCreatingHelper<T> implements BeanFactoryAware {

    private static final Logger logger = LoggerFactory.getLogger(BeanCreatingHelper.class);

    private AutowireCapableBeanFactory beanFactory;

    private final Class<? extends T> beanType;
    private final String beanName;
    private Class<?> createdBeanType;

    public BeanCreatingHelper(Class<? extends T> handlerType, String beanName) {
        this.beanType = handlerType;
        this.beanName = beanName;
        this.createdBeanType = beanType;
    }

    @Override
    public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
        if (beanFactory instanceof AutowireCapableBeanFactory) {
            this.beanFactory = (AutowireCapableBeanFactory) beanFactory;
        }
    }

    public Class<?> getCreatedBeanType() {
        return this.createdBeanType;
    }

    @SuppressWarnings("unchecked")
    public T createBean() {
        if (logger.isTraceEnabled()) {
            logger.trace("Creating instance for handler type {}", this.beanType);
        }
        if (this.beanFactory == null) {
            logger.warn("No BeanFactory available, attempting to use default constructor");
            return BeanUtils.instantiate(this.beanType);
        } else {

            if (beanType != null) {
                return this.beanFactory.createBean(this.beanType);
            } else {
                T bean = (T) beanFactory.getBean(beanName);
                createdBeanType = bean.getClass();
                return bean;
            }
        }
    }

    public void destroy(T handler) {
        if (this.beanFactory != null) {
            if (logger.isTraceEnabled()) {
                logger.trace("Destroying handler instance {}", handler);
            }
            this.beanFactory.destroyBean(handler);
        }
    }

    @Override
    public String toString() {
        return "BeanCreatingHelper [beanType=" + beanType + ", beanName=" + beanName + "]";
    }
}