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/**
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (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.mozilla.org/MPL/
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the
 * specific language governing rights and limitations under the License.
 *
 * The Original Code is "Responder.java".  Description:
 * "Performs the responding role in a message exchange according to HL7's original mode
 * processing rules."
 *
 * The Initial Developer of the Original Code is University Health Network. Copyright (C)
 * 2002.  All Rights Reserved.
 *
 * Contributor(s): ______________________________________.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * GNU General Public License (the  �GPL�), in which case the provisions of the GPL are
 * applicable instead of those above.  If you wish to allow use of your version of this
 * file only under the terms of the GPL and not to allow others to use your version
 * of this file under the MPL, indicate your decision by deleting  the provisions above
 * and replace  them with the notice and other provisions required by the GPL License.
 * If you do not delete the provisions above, a recipient may use your version of
 * this file under either the MPL or the GPL.
 *
 */
package ca.uhn.hl7v2.app;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.PipedInputStream;
import java.io.PipedOutputStream;
import java.io.Reader;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.util.HashMap;
import java.util.Map;

import ca.uhn.hl7v2.HL7Exception;
import ca.uhn.hl7v2.model.Message;
import ca.uhn.hl7v2.parser.Parser;
import ca.uhn.hl7v2.parser.PipeParser;
import ca.uhn.hl7v2.protocol.ApplicationRouter;
import ca.uhn.hl7v2.protocol.Transportable;
import ca.uhn.hl7v2.protocol.impl.TransportableImpl;

/**
 * 

* Performs the responding role in a message exchange (i.e receiver of the first * message, sender of the response; analagous to the server in a client-server * interaction), according to HL7's original mode processing rules. *

*

* At the time of writing, enhanced mode, two-phase reply, continuation * messages, and batch processing are unsupported. *

* * @author Bryan Tripp */ class Responder { private ApplicationRouter apps; private Socket inboundSocket; /** * Creates a new instance of Responder */ public Responder(Socket theInboundSocket) { inboundSocket = theInboundSocket; } /** * Processes an incoming message string and returns the response message * string. Message processing consists of parsing the message, finding an * appropriate Application and processing the message with it, and encoding * the response. Applications are chosen from among those registered using * registerApplication. The Parser is obtained from the * Connection associated with this Responder. */ protected String processMessage(String incomingMessageString) throws HL7Exception { Map metadata = new HashMap(); InetSocketAddress remoteSocketAddress = (InetSocketAddress) inboundSocket.getRemoteSocketAddress(); metadata.put(ApplicationRouter.METADATA_KEY_SENDING_IP, remoteSocketAddress.getAddress().getHostAddress()); metadata.put(ApplicationRouter.METADATA_KEY_SENDING_PORT, remoteSocketAddress.getPort()); Transportable response = apps.processMessage(new TransportableImpl(incomingMessageString, metadata)); return response.getMessage(); } // /** // * Logs the given exception and creates an error message to send to the // * remote system. // * // * @param encoding // * The encoding for the error message. If null, uses // * default encoding // */ // public static String logAndMakeErrorMessage(Exception e, Segment inHeader, // Parser p, String encoding) throws HL7Exception { // return ApplicationRouterImpl.logAndMakeErrorMessage(e, inHeader, p, encoding); // } /** * Registers an Application with this Responder. The "Application", in this * context, is the software that uses the information in the message. If * multiple applications are registered, incoming Message objects will be * passed to each one in turn (calling canProcess()) until one * of them accepts responsibility for the message. If none of the registered * applications can process the message, a DefaultApplication is used, which * simply returns an Application Reject message. */ void setApplicationRouter(ApplicationRouter router) { this.apps = router; } /** * Test code. */ @SuppressWarnings({ "unused", "resource" }) public static void main(String args[]) { if (args.length != 1) { System.err.println("Usage: DefaultApplication message_file"); System.exit(1); } // read test message file ... try { File messageFile = new File(args[0]); Reader in = new BufferedReader(new FileReader(messageFile)); int fileLength = (int) messageFile.length(); char[] cbuf = new char[fileLength]; in.read(cbuf, 0, fileLength); String messageString = new String(cbuf); // parse inbound message ... final Parser parser = new PipeParser(); Message inMessage = null; try { inMessage = parser.parse(messageString); } catch (HL7Exception e) { e.printStackTrace(); } // process with responder ... PipedInputStream initInbound = new PipedInputStream(); PipedOutputStream initOutbound = new PipedOutputStream(); PipedInputStream respInbound = new PipedInputStream(initOutbound); PipedOutputStream respOutbound = new PipedOutputStream(initInbound); /* * This code won't work with new changes: final ActiveInitiator init = new * ActiveInitiator(parser, new MinLowerLayerProtocol(), initInbound, * initOutbound); Responder resp = new Responder(respInbound, * respOutbound); * * //run the initiator in a separate thread ... final Message * inMessCopy = inMessage; Thread initThd = new Thread(new * Runnable() { public void run() { try { Message response = * init.sendAndReceive(inMessCopy); * System.out.println("This is initiator writing response ..."); * System.out.println(parser.encode(response)); } catch (Exception * ie) { if (HL7Exception.class.isAssignableFrom(ie.getClass())) { * System.out.println("Error in segment " + * ((HL7Exception)ie).getSegmentName() + " field " + * ((HL7Exception)ie).getFieldPosition()); } ie.printStackTrace(); } * } }); initThd.start(); * * //process the message we expect from the initiator thread ... * System.out.println("Responder is going to respond now ..."); * resp.processOneMessage(); */ } catch (Exception e) { e.printStackTrace(); } } }




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