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The spring component framework is used to setup a plugin based, micro-kernel, standalone application (today, we will support webapp in later releases) which is based on SpringFramework. It can help you decouple your application into several components clearly with zero invasion and keep your application consistent between develop time and runtime.

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/**
 * @author XiongJie, Date: 13-10-31
 */
package net.happyonroad.spring;

import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.GenericApplicationContext;

import java.util.Set;

/** 将多个Context组合成为一个 */
public class CombinedApplicationContext extends GenericApplicationContext {

    public CombinedApplicationContext(Set dependedContexts) {
        StringBuilder name = new StringBuilder("Combined Context of: [");
        //不应该将依赖的bean的context里面的放过来
        //为了让系统能够正确的加载或者解析，先仅仅将PropertyConfigurer加过来
        //或者，property configurer也应该以服务的形式export再import?
        for (ApplicationContext context : dependedContexts) {
            String[] beanNames = context.getBeanNamesForType(PropertyPlaceholderConfigurer.class);
            for (String beanName : beanNames) {
                Object bean = context.getBean(beanName);
                //在不同的context里面，可能有重复，忽略
                try {
                    this.getBeanFactory().registerSingleton(beanName, bean);
                } catch (Exception e) {
                    //skip it
                }
            }
            name.append(context.getDisplayName()).append(",");
        }
        name.deleteCharAt(name.length()-1);
        name.append("]");
        setDisplayName(name.toString());
    }

}