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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: 13-9-22
 */
package net.happyonroad.component.classworld;

import org.codehaus.plexus.classworlds.strategy.AbstractStrategy;

import java.io.IOException;
import java.net.URL;
import java.util.Enumeration;

/**
 * 参考 SelfFirstStrategy 实现的 类/资源加载策略
 */
public class PomStrategy extends AbstractStrategy {
    protected PomClassRealm pomRealm;

    public PomStrategy(PomClassRealm realm) {
        super(realm);
        this.pomRealm = realm;
    }

    @Override
    public Class loadClass(String name) throws ClassNotFoundException {
        //pom realm refer to component itself
        Class clazz = pomRealm.loadClassFromSelf(name);

        if ( clazz == null )
        {
            //depended pom realms refer to depended components
            clazz = pomRealm.loadClassFromDepends( name );

            if ( clazz == null )
            {
                //refer to 3rd libraries which can be accessed by current class
                clazz = pomRealm.loadClassFromParent( name );

                if ( clazz == null )
                {
                    throw new ClassNotFoundException( name );
                }
            }
        }

        return clazz;
    }

    @Override
    public URL getResource(String name) {
        URL resource = pomRealm.loadResourceFromDepends(name);

        if ( resource == null )
        {
            resource = pomRealm.loadResourceFromSelf( name );

            if ( resource == null )
            {
                resource = pomRealm.loadResourceFromParent( name );
            }
        }

        return resource;
    }

    @Override
    public Enumeration getResources(String name) throws IOException {
        Enumeration depends = pomRealm.loadResourcesFromDepends(name);
        Enumeration self = pomRealm.loadResourcesFromSelf( name );
        Enumeration parent = pomRealm.loadResourcesFromParent( name );

        return combineResources( depends, self, parent );
    }
}