I would really like to get a HAPI Simple Server to write to a Glassfish JMS
queue, and it's been doing my head in for a couple of days now and I just can't
seem to join the last dot.
Please be aware, I am still learning this stuff the hard way, with limited
experience, and next to no documentation on how these things work.
The inbound ejbs I am working with are shown below. The critical problem seems
to be that when the registered processor fires, the queue objects defined have
not been instantiated and are null, so the good old null pointer exception
brings everything to a grinding halt.
Anyone got any thoughts?
Anyone got any documentation on how SimpleServer might work in an appserver
environment?
Have also investigated running the SimpleServer as a standalone and connecting
to the Glassfish jms service via it's jndi, and there is quite a bit of talk on
the interwebs about how hard Glassfish 3.x has made this.
Thanks
Ian
Code:
------------------
HL7InBean Code
------------------
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package au.gov.qld.health.sit.hl7tcp;
import ca.uhn.hl7v2.app.SimpleServer;
import ca.uhn.hl7v2.llp.LowerLayerProtocol;
import ca.uhn.hl7v2.parser.PipeParser;
import ca.uhn.hl7v2.validation.impl.NoValidation;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.annotation.Resource;
import javax.ejb.Singleton;
import javax.ejb.Startup;
import javax.jms.Connection;
import javax.jms.JMSException;
import javax.jms.MessageProducer;
import javax.jms.Queue;
import javax.jms.QueueConnection;
import javax.jms.QueueConnectionFactory;
import javax.jms.Session;
/**
*
* @author Ian
*/
@Startup
@Singleton
public class Hl7InBean {
@Resource(mappedName = "jms/qHl7InboundConnectionFactory")
private QueueConnectionFactory cfHl7In;
@Resource(mappedName = "jms/qHl7Inbound")
private Queue qHl7Inbound;
private SimpleServer ss = null;
@PostConstruct
public void StartListening() {
try {
Logger.getLogger(Hl7InBean.class.getName()).log(Level.INFO, "Inbound
session has started");
QueueConnection qConnection = cfHl7In.createQueueConnection();
Hl7InProcessor processor = new Hl7InProcessor(qConnection);
PipeParser pp = new PipeParser();
pp.setValidationContext(new NoValidation());
// Create a new SimpleServer that listens on port 8888
ss = new SimpleServer(8888, LowerLayerProtocol.makeLLP(), pp);
// Create and register some class that implements messages (ORU in this
example)
ss.registerApplication("*", "*", processor);
ss.start();
Logger.getLogger(Hl7InBean.class.getName()).log(Level.INFO, "Message
sent, session closed");
} catch (JMSException ex) {
Logger.getLogger(Hl7InBean.class.getName()).log(Level.SEVERE, null,
ex);
}
}
@PreDestroy
public void Cleanup() {
}
}
----------------------------------------------------------------------
HL7InProcessor (written as an ejb in this case, been tried a few ways)
----------------------------------------------------------------------
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package au.gov.qld.health.sit.hl7tcp;
import ca.uhn.hl7v2.HL7Exception;
import ca.uhn.hl7v2.app.ApplicationException;
import ca.uhn.hl7v2.model.Message;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.ejb.Stateless;
import javax.ejb.LocalBean;
import ca.uhn.hl7v2.app.Application;
import javax.annotation.PreDestroy;
import javax.annotation.Resource;
import javax.ejb.Singleton;
import javax.ejb.Startup;
import javax.jms.JMSException;
import javax.jms.MessageProducer;
import javax.jms.Queue;
import javax.jms.QueueConnection;
import javax.jms.QueueConnectionFactory;
import javax.jms.Session;
/**
*
* @author Ian
*/
@Singleton
public class Hl7InProcessor implements Application {
@Resource(mappedName = "jms/qHl7InboundConnectionFactory")
private QueueConnectionFactory cfHl7In;
@Resource(mappedName = "jms/qHl7Inbound")
private QueueConnection qConnection;
private Queue qHl7Inbound;
private Session qSession;
private MessageProducer messageProducer;
private static final Logger logger =
Logger.getLogger(Hl7InProcessor.class.getName());
public Hl7InProcessor() {
}
public Hl7InProcessor(QueueConnection qConnection) {
try {
this.qConnection = qConnection;
logger.log(Level.INFO,"Hl7InProcessor is being constructed");
qSession = this.qConnection.createSession(false,
Session.AUTO_ACKNOWLEDGE);
messageProducer = qSession.createProducer(qHl7Inbound);
} catch (JMSException ex) {
logger.log(Level.SEVERE, null, ex);
}
}
@Override
public Message processMessage(Message msg) {
try {
javax.jms.TextMessage out = qSession.createTextMessage();
out.setText("This is an example message");
messageProducer.send(out);
return msg;
} catch (JMSException ex1) {
logger.log(Level.SEVERE, null, ex1);
return msg;
}
}
@Override
public boolean canProcess(Message msg) {
return true;
}
@PreDestroy
public void cleanup() {
try {
messageProducer.close();
qSession.close();
qConnection.close();
}
catch (JMSException ex) {
logger.log(Level.SEVERE, null, ex);
}
}
}
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