org.apache.ws.scout.transport.RMITransport.java Source code

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Here is the source code for org.apache.ws.scout.transport.RMITransport.java

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/*
 * Copyright 2001-2004 The Apache Software Foundation.
 * 
 * Licensed 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.ws.scout.transport;

import java.lang.reflect.Method;
import java.net.URI;
import java.util.Properties;

import javax.naming.InitialContext;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.ws.scout.util.XMLUtils;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

/**
 * RMI Message transport class.
 * 
 * <p>This transport calls jUDDI using RMI.</p>
 * 
 * @author Kurt Stam (kurt.stam@redhat.com)
 */
public class RMITransport implements Transport {
    // private reference to the jUDDI logger
    private static Log log = LogFactory.getLog(RMITransport.class);

    /** 
     * Sends an element and returns an element.
     */
    public Element send(Element request, URI endpointURI) throws TransportException {
        Element response = null;

        if (log.isDebugEnabled()) {
            log.debug("\nRequest message:\n" + XMLUtils.convertNodeToXMLString(request));
            log.debug("Calling " + endpointURI + " using rmi");
        }

        try {
            String host = endpointURI.getHost();
            int port = endpointURI.getPort();
            String scheme = endpointURI.getScheme();
            String service = endpointURI.getPath();
            String className = endpointURI.getQuery();
            String methodName = endpointURI.getFragment();
            Properties env = new Properties();
            //It be a lot nicer if this is configured through properties, but for now
            //I'd like to keep the changes localized, so this seems pretty reasonable.
            String factoryInitial = SecurityActions.getProperty("java.naming.factory.initial");
            if (factoryInitial == null)
                factoryInitial = "org.jnp.interfaces.NamingContextFactory";
            String factoryURLPkgs = SecurityActions.getProperty("java.naming.factory.url.pkgs");
            if (factoryURLPkgs == null)
                factoryURLPkgs = "org.jboss.naming";
            env.setProperty("java.naming.factory.initial", factoryInitial);
            env.setProperty("java.naming.factory.url.pkgs", factoryURLPkgs);
            env.setProperty("java.naming.provider.url", scheme + "://" + host + ":" + port);
            log.debug("Initial Context using env=" + env.toString());
            InitialContext context = new InitialContext(env);
            log.debug("Calling service=" + service + ", Class = " + className + ", Method=" + methodName);
            //Looking up the object (i.e. Publish)
            Object requestHandler = context.lookup(service);
            //Loading up the stub
            Class<?> c = Class.forName(className);
            //Getting a handle to method we want to call (i.e. publish.publish(Element element))
            Method method = c.getMethod(methodName, Element.class);
            //Calling that method
            Node node = (Node) method.invoke(requestHandler, request);
            //The result is in the first element
            if (node.getFirstChild() != null) {
                response = (Element) node.getFirstChild();
            }
        } catch (Exception ex) {
            throw new TransportException(ex);
        }
        if (log.isDebugEnabled()) {
            log.debug("\nResponse message:\n" + XMLUtils.convertNodeToXMLString(response));
        }
        return response;
    }

    /**
     * Sends an XML, responds with an XML.
     */
    public String send(String request, URI endpointURI) throws TransportException {
        String response = null;
        log.debug("\nRequest message:\n" + request);
        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder parser = factory.newDocumentBuilder();
            Document document = parser.parse(request);
            Element element = document.getDocumentElement();
            response = XMLUtils.convertNodeToXMLString(send(element, endpointURI));
        } catch (Exception ex) {
            throw new TransportException(ex);
        }
        log.debug("\nResponse message:\n" + response);
        return response;
    }

}