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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.tuscany.service.discovery.jxta.prp;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import net.jxta.impl.protocol.ResolverResponse;
import net.jxta.protocol.ResolverQueryMsg;
import net.jxta.protocol.ResolverResponseMsg;
import net.jxta.resolver.QueryHandler;
import net.jxta.resolver.ResolverService;
import org.apache.tuscany.service.discovery.jxta.JxtaDiscoveryService;
import org.apache.tuscany.service.discovery.jxta.JxtaException;
import org.apache.tuscany.spi.services.discovery.RequestListener;
import org.apache.tuscany.spi.services.discovery.ResponseListener;
import org.apache.tuscany.spi.util.stax.StaxUtil;
/**
* Generic quety handler for tuscany PRP (Peer Resolver Protocol) messages. The
* <code>processQuery</code> method is invoked on the receiver and the <code>
* processResponse</code> is invoked on the sender when the receiver responds.
* @version $Revision$ $Date$
*
*/
public class TuscanyQueryHandler implements QueryHandler {
/** Resolver service for sending responses. */
private final ResolverService resolverService;
/** Discovery service. */
private final JxtaDiscoveryService discoveryService;
/**
* Initializes the JXTA resolver service and tuscany discovery service.
*
* @param resolverService Resolver service.
* @param discoveryService Tuscany discovery service.
*/
public TuscanyQueryHandler(final ResolverService resolverService, final JxtaDiscoveryService discoveryService) {
this.resolverService = resolverService;
this.discoveryService = discoveryService;
}
/**
* Processes a query message.
*/
public int processQuery(ResolverQueryMsg queryMessage) {
try {
final String message = queryMessage.getQuery();
final int queryId = queryMessage.getQueryId();
final String source = queryMessage.getSrc();
final String handler = queryMessage.getHandlerName();
final QName messageType = StaxUtil.getDocumentElementQName(message);
RequestListener messageListener = discoveryService.getRequestListener(messageType);
if(messageListener != null) {
XMLStreamReader requestReader = StaxUtil.createReader(message);
XMLStreamReader responseReader = messageListener.onRequest(requestReader);
String response = StaxUtil.serialize(responseReader);
ResolverResponse responseMessage = new ResolverResponse();
responseMessage.setResponse(response);
responseMessage.setHandlerName(handler);
responseMessage.setQueryId(queryId);
resolverService.sendResponse(source, responseMessage);
}
return ResolverService.OK;
} catch(XMLStreamException ex) {
throw new JxtaException(ex);
}
}
/**
* Processes a response message.
*/
public void processResponse(ResolverResponseMsg responseMessage) {
try {
final String message = responseMessage.getResponse();
final int queryId = responseMessage.getQueryId();
final QName messageType = StaxUtil.getDocumentElementQName(message);
ResponseListener messageListener = discoveryService.getResponseListener(messageType);
if(messageListener != null) {
XMLStreamReader responseReader = StaxUtil.createReader(message);
messageListener.onResponse(responseReader, queryId);
}
} catch(XMLStreamException ex) {
throw new JxtaException(ex);
}
}
}
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