沒想到，竟然有用 hk2 做 dependency injection 的一天。

MyApplication.java

package my.web.toolkits;

import javax.inject.Singleton;

import my.web.toolkits.ydl.YoutubeSignature;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.glassfish.hk2.api.Factory;
import org.glassfish.hk2.utilities.binding.AbstractBinder;
import org.glassfish.jersey.server.ResourceConfig;

public class MyApplication extends ResourceConfig {

    static Log logger = LogFactory.getLog(MyApplication.class);

    public MyApplication() {
        register(new MyApplicationBinder());
    }

    static class MyApplicationBinder extends AbstractBinder {
        @Override
        protected void configure() {
            bindFactory(new Factory<YoutubeSignature>() {

                @Override
                public YoutubeSignature provide() {
                    YoutubeSignature signature = new YoutubeSignature(YoutubeSignature.SCRIPT_URL);
                    signature.addReportReceiver("[email protected]");
                    return signature;
                }

                @Override
                public void dispose(YoutubeSignature instance) {
                }
            }).to(YoutubeSignature.class).in(Singleton.class);
        }
    }

}