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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: 13-10-30
 */
package net.happyonroad.spring;

import net.happyonroad.component.container.MutableServiceRegistry;
import net.happyonroad.component.container.ServiceRegistry;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.util.ClassUtils;
import org.springframework.util.StringUtils;

/** 导入服务的Bean对象 */
public class SpringServiceImporter extends SpringServiceProxy {
    private static Logger logger = LoggerFactory.getLogger(SpringServiceImporter.class);

    private String as;

    public String getAs() {
        if(!StringUtils.hasText(as)){
            String last = StringUtils.unqualify(getRole());
            return   StringUtils.uncapitalize(last);
        }
        return as;
    }

    public void setAs(String as) {
        this.as = as;
    }

    @Override
    public String getHint() {
        String hint = super.getHint();
        if (!StringUtils.hasText(hint)) {
            return ServiceRegistry.ANY_HINT;
        }
        return hint;
    }

    /**
     * 从服务注册表中导入相应的服务，并放在特定上下文中
     *
     * @param serviceRegistry  服务注册表
     * @param serviceContext 服务上下文，不是组件的那个上下文
     */
    public void importService(MutableServiceRegistry serviceRegistry, ApplicationContext serviceContext)
            throws ServiceNotFoundException {
        Object service = serviceRegistry.getService(getRoleClass(), getHint());
        if(service != null){
            ConfigurableBeanFactory cbf = (ConfigurableBeanFactory) serviceContext.getAutowireCapableBeanFactory();
            logger.debug("Import {} to {} as {}", this, serviceContext.getDisplayName(), getAs());
            cbf.registerSingleton(getAs(), service);
        }else{
            throw new ServiceNotFoundException(this);
        }
    }

    /**
     * 从组件上下文中移除特定的服务
     *
     * @param serviceRegistry  服务注册表
     * @param serviceContext 服务上下文，不是组件的那个上下文
     */
    public void removeService(MutableServiceRegistry serviceRegistry, ApplicationContext serviceContext) {
        logger.debug("Remove {} which is named as {} from {}", this, getAs(), serviceContext.getDisplayName());
        ConfigurableBeanFactory cbf = (ConfigurableBeanFactory) serviceContext.getAutowireCapableBeanFactory();
        Object service = cbf.getBean(getAs());
        //TODO 现在这样注册过去的bean无法被卸载
        try {
            cbf.destroyBean(getAs(), service);
        } catch (Exception e) {
            logger.trace("TODO: registerResolver a destroyable bean:" + e.getMessage());
        }
    }

    @Override
    public String toString() {
        return String.format("%s(hint=%s, as=%s)", ClassUtils.getShortName(role), getHint(), getAs());
    }
}