/// <summary> Returns the Applications that has been registered to handle
/// messages of the given type and trigger event, or null if
/// there are none. If there is not an exact match, wildcards
/// ("*") are tried as well.
/// </summary>
private NuGenApplication getMatchingApplication(System.String messageType, System.String triggerEvent)
{
lock (this)
{
NuGenApplication matchingApp = null;
System.Object o = this.apps[getKey(messageType, triggerEvent)];
if (o == null)
{
o = this.apps[getKey(messageType, "*")];
}
if (o == null)
{
o = this.apps[getKey("*", triggerEvent)];
}
if (o == null)
{
o = this.apps[getKey("*", "*")];
}
if (o != null)
{
matchingApp = (NuGenApplication)o;
}
return(matchingApp);
}
}
/// <summary> Forwards the given message to any Applications that have been registered to
/// accept messages of that type and trigger event.
/// </summary>
/// <throws> ApplicationException if no such Applications are registered, or if </throws>
/// <summary> the underlying Application throws this exception during processing.
/// </summary>
public virtual Message processMessage(Message in_Renamed)
{
Message out_Renamed;
try
{
NuGenApplication matchingApp = this.getMatchingApplication(in_Renamed);
out_Renamed = matchingApp.processMessage(in_Renamed);
}
catch (NuGenHL7Exception e)
{
throw new NuGenApplicationException("Error internally routing message: " + e.ToString(), e);
}
return(out_Renamed);
}
/// <summary> Registers the given application to handle messages corresponding to the given type
/// and trigger event. Only one application can be registered for a given message type
/// and trigger event combination. A repeated registration for a particular combination
/// of type and trigger event over-writes the previous one. Use "*" as a wildcard (e.g.
/// registerApplication("ADT", "*", myApp) would register your app for all ADT messages).
/// </summary>
public virtual void registerApplication(System.String messageType, System.String triggerEvent, NuGenApplication handler)
{
lock (this)
{
this.apps[getKey(messageType, triggerEvent)] = handler;
//status message
System.Text.StringBuilder buf = new System.Text.StringBuilder();
buf.Append(handler.GetType().FullName);
buf.Append(" registered to handle ");
buf.Append(messageType);
buf.Append("^");
buf.Append(triggerEvent);
buf.Append(" messages");
}
}
/// <summary> 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.
/// </summary>
protected internal virtual System.String processMessage(System.String incomingMessageString)
{
Message incomingMessageObject = null;
System.String outgoingMessageString = null;
try
{
incomingMessageObject = parser.parse(incomingMessageString);
}
catch (NuGenHL7Exception e)
{
outgoingMessageString = logAndMakeErrorMessage(e, parser.getCriticalResponseData(incomingMessageString), parser, parser.getEncoding(incomingMessageString));
}
if (outgoingMessageString == null)
{
try
{
//optionally check integrity of parse
try
{
if (checkWriter != null)
{
checkParse(incomingMessageString, incomingMessageObject, parser);
}
}
catch (System.IO.IOException)
{
}
//message validation (in terms of optionality, cardinality) would go here ***
NuGenApplication app = findApplication(incomingMessageObject);
Message response = app.processMessage(incomingMessageObject);
//Here we explicitly use the same encoding as that of the inbound message - this is important with GenericParser, which might use a different encoding by default
outgoingMessageString = parser.encode(response, parser.getEncoding(incomingMessageString));
}
catch (System.Exception e)
{
outgoingMessageString = logAndMakeErrorMessage(e, (Segment)incomingMessageObject.get_Renamed("MSH"), parser, parser.getEncoding(incomingMessageString));
}
}
return(outgoingMessageString);
}
/// <summary> Returns true if at least one application has been registered to accept this
/// type of message. Applications are registered using <code>registerApplication(...)</code>.
/// </summary>
public virtual bool canProcess(Message in_Renamed)
{
bool can = false;
try
{
NuGenApplication matches = this.getMatchingApplication(in_Renamed);
if (matches != null)
{
can = true;
}
}
catch (NuGenHL7Exception)
{
can = false;
}
return(can);
}
/// <summary> Returns the first Application that has been registered, which can process the given
/// Message (according to its canProcess() method).
/// </summary>
private NuGenApplication findApplication(Message message)
{
int c = 0;
NuGenApplication app = null;
while (app == null && c < this.apps.Count)
{
NuGenApplication a = (NuGenApplication)this.apps[c++];
if (a.canProcess(message))
{
app = a;
}
}
//have to send back an application reject of no apps available to process
if (app == null)
{
app = new NuGenDefaultApplication();
}
return(app);
}
/// <summary> <p>A convenience method for registering applications (using <code>registerApplication()
/// </code>) with this service. Information about which Applications should handle which
/// messages is read from the given text file. Each line in the file should have the
/// following format (entries tab delimited):</p>
/// <p>message_type 	 trigger_event 	 application_class</p>
/// <p>message_type 	 trigger_event 	 application_class</p>
/// <p>Note that message type and event can be the wildcard "*", which means any.</p>
/// <p>For example, if you write an Application called org.yourorganiztion.ADTProcessor
/// that processes several types of ADT messages, and another called
/// org.yourorganization.ResultProcessor that processes result messages, you might have a
/// file that looks like this: </p>
/// <p>ADT 	 * 	 org.yourorganization.ADTProcessor<br>
/// ORU 	 R01 	 org.yourorganization.ResultProcessor</p>
/// <p>Each class listed in this file must implement Application and must have a zero-argument
/// constructor.</p>
/// </summary>
public virtual void loadApplicationsFromFile(System.IO.FileInfo f)
{
System.IO.StreamReader in_Renamed = new System.IO.StreamReader(new System.IO.StreamReader(f.FullName, System.Text.Encoding.Default).BaseStream, new System.IO.StreamReader(f.FullName, System.Text.Encoding.Default).CurrentEncoding);
System.String line = null;
while ((line = in_Renamed.ReadLine()) != null)
{
//parse application registration information
SupportClass.Tokenizer tok = new SupportClass.Tokenizer(line, "\t", false);
System.String type = null, event_Renamed = null, className = null;
if (tok.HasMoreTokens())
{
//skip blank lines
try
{
type = tok.NextToken();
event_Renamed = tok.NextToken();
className = tok.NextToken();
}
catch (System.ArgumentOutOfRangeException)
{
throw new NuGenHL7Exception("Can't register applications from file " + f.Name + ". The line '" + line + "' is not of the form: message_type [tab] trigger_event [tab] application_class.", NuGenHL7Exception.APPLICATION_INTERNAL_ERROR);
}
System.Type appClass = System.Type.GetType(className); //may throw ClassNotFoundException
System.Object appObject = System.Activator.CreateInstance(appClass);
NuGenApplication app = null;
try
{
app = (NuGenApplication)appObject;
}
catch (System.InvalidCastException)
{
throw new NuGenHL7Exception("The specified class, " + appClass.FullName + ", doesn't implement Application.", NuGenHL7Exception.APPLICATION_INTERNAL_ERROR);
}
this.registerApplication(type, event_Renamed, app);
}
}
}
/// <summary> Registers a message parser/encoder with this responder. If multiple parsers
/// are registered, each message is inspected by each parser in the order in which
/// they are registered, until one parser recognizes the format and parses the
/// message.
/// </summary>
/*public void registerParser(Parser p) {
this.parsers.add(p);
}*/
/// <summary> 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.
/// </summary>
public virtual void registerApplication(NuGenApplication a)
{
this.apps.Add(a);
}
/// <summary> Registers the given application to handle messages corresponding to the given type
/// and trigger event. Only one application can be registered for a given message type
/// and trigger event combination. A repeated registration for a particular combination
/// of type and trigger event over-writes the previous one. Note that the wildcard "*"
/// for messageType or triggerEvent means any type or event, respectively.
/// </summary>
public virtual void registerApplication(System.String messageType, System.String triggerEvent, NuGenApplication handler)
{
lock (this)
{
this.router.registerApplication(messageType, triggerEvent, handler);
}
}
/// <summary> Registers the given application to handle messages corresponding to the given type
/// and trigger event. Only one application can be registered for a given message type
/// and trigger event combination. A repeated registration for a particular combination
/// of type and trigger event over-writes the previous one. Note that the wildcard "*"
/// for messageType or triggerEvent means any type or event, respectively.
/// </summary>
public virtual void registerApplication(System.String messageType, System.String triggerEvent, NuGenApplication handler)
{
lock (this)
{
this.router.registerApplication(messageType, triggerEvent, handler);
}
}
/// <summary> Registers the given application to handle messages corresponding to the given type
/// and trigger event. Only one application can be registered for a given message type
/// and trigger event combination. A repeated registration for a particular combination
/// of type and trigger event over-writes the previous one. Use "*" as a wildcard (e.g.
/// registerApplication("ADT", "*", myApp) would register your app for all ADT messages).
/// </summary>
public virtual void registerApplication(System.String messageType, System.String triggerEvent, NuGenApplication handler)
{
lock (this)
{
this.apps[getKey(messageType, triggerEvent)] = handler;
//status message
System.Text.StringBuilder buf = new System.Text.StringBuilder();
buf.Append(handler.GetType().FullName);
buf.Append(" registered to handle ");
buf.Append(messageType);
buf.Append("^");
buf.Append(triggerEvent);
buf.Append(" messages");
}
}
/// <summary> Registers a message parser/encoder with this responder. If multiple parsers
/// are registered, each message is inspected by each parser in the order in which
/// they are registered, until one parser recognizes the format and parses the
/// message.
/// </summary>
/*public void registerParser(Parser p) {
* this.parsers.add(p);
* }*/
/// <summary> 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.
/// </summary>
public virtual void registerApplication(NuGenApplication a)
{
this.apps.Add(a);
}