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The servicemix-wsn2005 is a standard JBI Service Engine which implements the WS-Notification specification from Oasis.
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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.servicemix.wsn;

import java.math.BigInteger;
import java.util.List;

import javax.jws.Oneway;
import javax.jws.WebMethod;
import javax.jws.WebParam;
import javax.jws.WebResult;
import javax.jws.WebService;

import org.oasis_open.docs.wsn.b_2.CreatePullPoint;
import org.oasis_open.docs.wsn.b_2.DestroyPullPoint;
import org.oasis_open.docs.wsn.b_2.DestroyPullPointResponse;
import org.oasis_open.docs.wsn.b_2.GetMessages;
import org.oasis_open.docs.wsn.b_2.GetMessagesResponse;
import org.oasis_open.docs.wsn.b_2.NotificationMessageHolderType;
import org.oasis_open.docs.wsn.b_2.Notify;
import org.oasis_open.docs.wsn.b_2.UnableToDestroyPullPointFaultType;
import org.oasis_open.docs.wsn.bw_2.NotificationConsumer;
import org.oasis_open.docs.wsn.bw_2.PullPoint;
import org.oasis_open.docs.wsn.bw_2.UnableToCreatePullPointFault;
import org.oasis_open.docs.wsn.bw_2.UnableToDestroyPullPointFault;
import org.oasis_open.docs.wsn.bw_2.UnableToGetMessagesFault;
import org.oasis_open.docs.wsrf.rw_2.ResourceUnknownFault;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@WebService(endpointInterface = "org.oasis_open.docs.wsn.bw_2.PullPoint")
public abstract class AbstractPullPoint extends AbstractEndpoint implements PullPoint, NotificationConsumer {

    private final Logger logger = LoggerFactory.getLogger(AbstractPullPoint.class);

    protected AbstractCreatePullPoint createPullPoint;

    public AbstractPullPoint(String name) {
        super(name);
    }

    /**
     * 
     * @param notify
     */
    @WebMethod(operationName = "Notify")
    @Oneway
    public void notify(
            @WebParam(name = "Notify", 
                      targetNamespace = "http://docs.oasis-open.org/wsn/b-1", 
                      partName = "Notify")
            Notify notify) {

        logger.debug("Notify");
        for (NotificationMessageHolderType messageHolder : notify.getNotificationMessage()) {
            store(messageHolder);
        }
    }

    /**
     * 
     * @param getMessagesRequest
     * @return returns org.oasis_open.docs.wsn.b_1.GetMessagesResponse
     * @throws ResourceUnknownFault
     */
    @WebMethod(operationName = "GetMessages")
    @WebResult(name = "GetMessagesResponse", 
               targetNamespace = "http://docs.oasis-open.org/wsn/b-1", 
               partName = "GetMessagesResponse")
    public GetMessagesResponse getMessages(
            @WebParam(name = "GetMessages", 
                      targetNamespace = "http://docs.oasis-open.org/wsn/b-1", 
                      partName = "GetMessagesRequest")
            GetMessages getMessagesRequest) throws ResourceUnknownFault, UnableToGetMessagesFault {

        logger.debug("GetMessages");
        BigInteger max = getMessagesRequest.getMaximumNumber();
        List messages = getMessages(max != null ? max.intValue() : 0);
        GetMessagesResponse response = new GetMessagesResponse();
        response.getNotificationMessage().addAll(messages);
        return response;
    }

    /**
     * 
     * @param destroyRequest
     * @return returns org.oasis_open.docs.wsn.b_1.DestroyResponse
     * @throws UnableToDestroyPullPoint
     */
    @WebMethod(operationName = "DestroyPullPoint")
    @WebResult(name = "DestroyPullPointResponse", 
               targetNamespace = "http://docs.oasis-open.org/wsn/b-2", 
               partName = "DestroyPullPointResponse")
    public DestroyPullPointResponse destroyPullPoint(
            @WebParam(name = "DestroyPullPoint", 
                      targetNamespace = "http://docs.oasis-open.org/wsn/b-2", 
                      partName = "DestroyPullPointRequest")
            DestroyPullPoint destroyPullPointRequest) throws ResourceUnknownFault, UnableToDestroyPullPointFault {

        logger.debug("Destroy");
        createPullPoint.destroyPullPoint(getAddress());
        return new DestroyPullPointResponse();
    }

    public void create(CreatePullPoint createPullPointRequest) throws UnableToCreatePullPointFault {
    }

    protected abstract void store(NotificationMessageHolderType messageHolder);

    protected abstract List getMessages(int max) throws ResourceUnknownFault,
            UnableToGetMessagesFault;

    protected void destroy() throws UnableToDestroyPullPointFault {
        try {
            unregister();
        } catch (EndpointRegistrationException e) {
            UnableToDestroyPullPointFaultType fault = new UnableToDestroyPullPointFaultType();
            throw new UnableToDestroyPullPointFault("Error unregistering endpoint", fault, e);
        }
    }

    protected String createAddress() {
        return "http://servicemix.org/wsnotification/PullPoint/" + getName();
    }

    public AbstractCreatePullPoint getCreatePullPoint() {
        return createPullPoint;
    }

    public void setCreatePullPoint(AbstractCreatePullPoint createPullPoint) {
        this.createPullPoint = createPullPoint;
    }
}