/**
* 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 "SimpleServer.java". Description:
* "A simple TCP/IP-based HL7 server."
*
* The Initial Developer of the Original Code is University Health Network. Copyright (C)
* 2002. All Rights Reserved.
*
* Contributor(s): Kyle Buza
*
* 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.File;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import ca.uhn.hl7v2.DefaultHapiContext;
import ca.uhn.hl7v2.HapiContext;
import ca.uhn.hl7v2.app.AcceptorThread.AcceptedSocket;
import ca.uhn.hl7v2.concurrent.DefaultExecutorService;
import ca.uhn.hl7v2.llp.LowerLayerProtocol;
import ca.uhn.hl7v2.llp.MinLowerLayerProtocol;
import ca.uhn.hl7v2.parser.Parser;
import ca.uhn.hl7v2.parser.PipeParser;
import ca.uhn.hl7v2.util.SocketFactory;
/**
* <p>
* A simple TCP/IP-based HL7 server. This server listens for connections on a
* particular port, and creates a ConnectionManager for each incoming
* connection.
* </p>
* <p>
* A single SimpleServer can only service requests that use a single class of
* LowerLayerProtocol (specified at construction time).
* </p>
* <p>
* The ConnectionManager uses a {@link PipeParser} of the version specified in
* the constructor
* </p>
* <p>
* ConnectionManagers currently only support original mode processing.
* </p>
* <p>
* The ConnectionManager routes messages to various {@link Application}s based
* on message type. From the HL7 perspective, an {@link Application} is
* something that does something with a message.
* </p>
*
* @author Bryan Tripp
* @author Christian Ohr
*/
public class SimpleServer extends HL7Service {
/**
* Socket timeout for simple server
*/
public static final int SO_TIMEOUT = AcceptorThread.TIMEOUT;
private static final Logger log = LoggerFactory.getLogger(SimpleServer.class);
private int port;
private boolean tls;
private final BlockingQueue<AcceptedSocket> queue;
private AcceptorThread acceptor;
private HapiContext hapiContext;
/**
* Creates a new instance of SimpleServer that listens on the given port,
* using the {@link MinLowerLayerProtocol} and a standard {@link PipeParser}.
*/
public SimpleServer(int port) {
this(port, new MinLowerLayerProtocol(), new PipeParser(), false);
}
/**
* Creates a new instance of SimpleServer that listens on the given port,
* using the {@link MinLowerLayerProtocol} and a standard {@link PipeParser}.
*/
public SimpleServer(int port, boolean tls) {
this(port, new MinLowerLayerProtocol(), new PipeParser(), tls);
}
/**
* Creates a new instance of SimpleServer that listens on the given port.
*/
public SimpleServer(int port, LowerLayerProtocol llp, Parser parser) {
this(port, llp, parser, false);
}
/**
* Creates a new instance of SimpleServer that listens on the given port.
*/
public SimpleServer(int port, LowerLayerProtocol llp, Parser parser, boolean tls) {
this(port, llp, parser, tls, DefaultExecutorService.getDefaultService());
}
/**
* Creates a new instance of SimpleServer using a custom {link
* {@link ExecutorService}. This {@link ExecutorService} instance will
* <i>not</i> be shut down after the server stops!
*/
public SimpleServer(int port, LowerLayerProtocol llp, Parser parser, boolean tls,
ExecutorService executorService) {
super(parser, llp, executorService);
this.port = port;
this.tls = tls;
this.hapiContext = new DefaultHapiContext();
this.queue = new LinkedBlockingQueue<AcceptedSocket>(100);
}
/**
* Creates a new instance of SimpleServer that listens on a given server socket.
* SimpleServer will bind the socket when it is started, so the server socket
* must not already be bound.
*
* @since 2.1
* @throws IllegalStateException If serverSocket is already bound
*/
public SimpleServer(HapiContext hapiContext, int port, boolean tls) {
super(hapiContext);
this.hapiContext = hapiContext;
this.port = port;
this.tls = tls;
this.queue = new LinkedBlockingQueue<AcceptedSocket>(100);
}
/**
* Prepare server by initializing the server socket
*
* @see ca.uhn.hl7v2.app.HL7Service#afterStartup()
*/
@Override
protected void afterStartup() {
try {
super.afterStartup();
log.info("Starting SimpleServer running on port {}", port);
SocketFactory ss = this.hapiContext.getSocketFactory();
acceptor = new AcceptorThread(port, tls, getExecutorService(), queue, ss);
acceptor.start();
} catch (Exception e) {
log.error("Failed starting SimpleServer on port", port);
throw new RuntimeException(e);
}
}
/**
* Loop that waits for a connection and starts a ConnectionManager when it
* gets one.
*/
@Override
protected void handle() {
if (acceptor.getServiceExitedWithException() != null) {
setServiceExitedWithException(acceptor.getServiceExitedWithException());
}
try {
// Wait some period of time for connections
AcceptedSocket newSocket = queue.poll(500, TimeUnit.MILLISECONDS);
if (newSocket != null) {
log.info("Accepted connection from {}:{} on local port {}",
new Object[] { newSocket.socket.getInetAddress().getHostAddress(), newSocket.socket.getPort(), port });
ActiveConnection c = new ActiveConnection(getParser(), getLlp(), newSocket.socket,
getExecutorService());
newConnection(c);
}
} catch (InterruptedException ie) {
// just timed out
} catch (Exception e) {
log.error("Error while accepting connections: ", e);
}
}
/**
* Close down socket
*/
@Override
protected void afterTermination() {
super.afterTermination();
acceptor.stop();
}
/**
* Run server from command line. Port number should be passed as an
* argument, and a file containing a list of Applications to use can also be
* specified as an optional argument (as per
* <code>loadApplicationsFromFile(...)</code>). Uses the default
* LowerLayerProtocol.
*/
public static void main(String args[]) {
if (args.length < 1 || args.length > 2) {
System.out
.println("Usage: ca.uhn.hl7v2.app.SimpleServer port_num [application_spec_file_name]");
System.exit(1);
}
int port = 0;
try {
port = Integer.parseInt(args[0]);
} catch (NumberFormatException e) {
System.err.println("The given port (" + args[0]
+ ") is not an integer.");
System.exit(1);
}
File appFile = null;
if (args.length == 2) {
appFile = new File(args[1]);
}
try {
SimpleServer server = new SimpleServer(port);
if (appFile != null)
server.loadApplicationsFromFile(appFile);
server.start();
} catch (Exception e) {
e.printStackTrace();
}
}
}