Java Web サービスで Restlet ルーティングシステムを活用する (1/2)

public class Blocker extends org.restlet.routing.Filter {

    private final Set<String> blockedAddresses;                         #A

    public Blocker(Context context) {
        super(context);
        this.blockedAddresses = new CopyOnWriteArraySet<String>();
    }

    @Override                                                          
    protected int beforeHandle(Request request, Response response) {    #B
        int result = STOP;

        if (getBlockedAddresses()
                .contains(request.getClientInfo().getAddress())) {
            response.setStatus(Status.CLIENT_ERROR_FORBIDDEN,
                    "Your IP address was blocked");
        } else {
            result = CONTINUE;
        }

        return result;
    }

    public Set<String> getBlockedAddresses() {
        return blockedAddresses;
    }

}

import org.restlet.Application;
import org.restlet.Request;
import org.restlet.Response;
import org.restlet.Restlet;
import org.restlet.Server;
import org.restlet.data.MediaType;
import org.restlet.data.Protocol;

public class MailServerApplication extends Application {
   
    public static void main(String[] args) throws Exception {     #A
        Server mailServer = new Server(Protocol.HTTP, 8182);
        mailServer.setNext(new MailServerApplication());
        mailServer.start();
    }

    @Override
    public Restlet createInboundRoot() {                          #B
        return new Restlet() {
            @Override
            public void handle(Request request, Response response) {
                String entity = "Method       : " + request.getMethod()
                        + "\ nResource URI : " 
                        + request.getResourceRef()
                        + "\ nIP address   : "
                        + request.getClientInfo().getAddress()
                        + "\ nAgent name   : "
                        + request.getClientInfo().getAgentName()
                        + "\ nAgent version: "
                        + request.getClientInfo().getAgentVersion();
                response.setEntity(entity, MediaType.TEXT_PLAIN);
            }
           };
    }
   }

@Override
    public Restlet createInboundRoot() {
        Blocker blocker = new Blocker(getContext());
        // blocker.getBlockedAddresses().add("127.0.0.1");
        blocker.setNext(new Tracer(getContext()));
        return blocker;
    }