/**
* 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;
/**
* <p>
* 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.
* </p>
* <p>
* At the time of writing, enhanced mode, two-phase reply, continuation
* messages, and batch processing are unsupported.
* </p>
*
* @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
* <code>registerApplication</code>. The Parser is obtained from the
* Connection associated with this Responder.
*/
protected String processMessage(String incomingMessageString)
throws HL7Exception {
Map<String, Object> metadata = new HashMap<String, Object>();
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 <code>null</code>, 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 <code>canProcess()</code>) 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();
}
}
}