com.himanshu.spring.context.loader.diffconfigpercontext.ServiceFactoryDiffConfigPerContext.java Source code

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Here is the source code for com.himanshu.spring.context.loader.diffconfigpercontext.ServiceFactoryDiffConfigPerContext.java

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/*
 * Copyright 2013 Himanshu Bhardwaj
 *
 * 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.himanshu.spring.context.loader.diffconfigpercontext;

import java.util.HashMap;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.context.support.GenericApplicationContext;

public class ServiceFactoryDiffConfigPerContext implements ApplicationContextAware, InitializingBean {

    private Logger logger = LoggerFactory.getLogger(getClass());

    private String contextsToLoad = "context1,context2";

    private ApplicationContext context;

    private Map<String, ConfigurableApplicationContext> appContextMap = new HashMap<String, ConfigurableApplicationContext>();

    private ApplicationContext getParentContext() {
        GenericApplicationContext parentContext = new GenericApplicationContext();
        parentContext.getBeanFactory().registerSingleton("dummyBean", this);
        parentContext.getBeanFactory().registerSingleton("mainContext", context);
        parentContext.refresh();
        return parentContext;
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        ApplicationContext parentContext = getParentContext();
        String[] contextToLoadArr = contextsToLoad.split(",");
        for (String contextToLoad : contextToLoadArr) {
            if (appContextMap.get(contextToLoad) == null) {
                String beanDefinitionFile = "diff-config-per-context" + "/context/" + contextToLoad + "/"
                        + contextToLoad + "-config.xml";
                logger.info("Loading bean definitions from: " + beanDefinitionFile);
                System.setProperty("context.to.load", contextToLoad);
                ClassPathXmlApplicationContext appContext = new ClassPathXmlApplicationContext(
                        new String[] { beanDefinitionFile }, true, parentContext);
                appContextMap.put(contextToLoad, appContext);
            }
        }
    }

    @Override
    public void setApplicationContext(ApplicationContext arg0) throws BeansException {
        this.context = arg0;
    }

    public <T> T getBean(Class<T> clazz, String contextStringToLoadFrom) {
        return appContextMap.get(contextStringToLoadFrom).getBean(clazz);
    }

}