/// <summary> Dispatch a SIF_Request.
///
/// <b>When ALQ Disabled:</b> The SIF_Request is immediately dispatched to
/// the Publisher of the associated topic. Only after the Publisher has
/// returned a result does this method return, causing the SIF_Request to
/// be acknowledged. The result data returned by the Publisher is handed to
/// the zone's ResponseDelivery thread, which sends SIF_Response messages to
/// the ZIS until all of the result data has been sent, potentially with
/// multiple SIF_Response packets. Note without the ALQ, there is the
/// potential for the agent to terminate before all data has been sent,
/// causing some results to be lost. In this case the SIF_Request will have
/// never been ack'd and will be processed again the next time the agent
/// is started.
///
///
/// <b>When ALQ Enabled:</b> The SIF_Request is placed in the ALQ where it
/// will be consumed by the zone's ResponseDelivery thread at a later time.
/// This method returns immediately, causing the SIF_Request to be
/// acknowledged. The ResponseDelivery handles dispatching the request to
/// the Publisher of the associated topic, and also handles returning
/// SIF_Response packets to the ZIS. With the ALQ, the processing of the
/// SIF_Request and the returning of all SIF_Response data is guaranteed
/// because the original SIF_Request will not be removed from the ALQ until
/// both of these activities have completed successfully (even over multiple
/// agent sessions).
///
///
/// Note that any error that occurs during a SIF_Request should result in a
/// successful SIF_Ack (because the SIF_Request was received successfully),
/// and a single SIF_Response with a SIF_Error payload. The SIF Compliance
/// harness checks for this.
///
///
/// </summary>
/// <param name="req">The SIF_Request to process
/// </param>
private void dispatchRequest(SIF_Request req)
{
SifVersion renderAsVer = null;
SIF_Query q = null;
SIF_QueryObject qo = null;
IElementDef typ = null;
int maxBufSize = 0;
bool rethrow = false;
try
{
// block thread until Zone.query() has completed in case it is in the
// midst of a SIF_Request and the destination of that request is this
// agent (i.e. a request of self). This is done to ensure that we don't
// receive the SIF_Request from the zone before the ADK and agent have
// finished issuing it in Zone.query()
fZone.WaitForRequestsToComplete();
//
// Check SIF_Version. If the version is not supported by the Adk,
// fail the SIF_Request with an error SIF_Ack. If the version is
// supported, continue on; the agent may not support this version,
// but that will be determined later and will result in a SIF_Response
// with a SIF_Error payload.
//
SIF_Version[] versions = req.GetSIF_Versions();
if (versions == null || versions.Length == 0)
{
rethrow = true;
throw new SifException
(
SifErrorCategoryCode.Xml,
SifErrorCodes.XML_MISSING_MANDATORY_ELEMENT_6,
"SIF_Request/SIF_Version is a mandatory element",
fZone);
}
// SIF_Version specifies the version of SIF that will be used to render
// the SIF_Responses
// TODO: Add support for multiple SIF_Request versions
renderAsVer = SifVersion.Parse(versions[0].Value);
if (!Adk.IsSIFVersionSupported(renderAsVer))
{
rethrow = true;
throw new SifException
(
SifErrorCategoryCode.RequestResponse,
SifErrorCodes.REQRSP_UNSUPPORTED_SIFVERSION_7,
"SIF_Version " + renderAsVer + " is not supported by this agent",
fZone);
}
// Check max buffer size
int? maximumBufferSize = req.SIF_MaxBufferSize;
if (!maximumBufferSize.HasValue )
{
rethrow = true;
throw new SifException
(
SifErrorCategoryCode.Xml,
SifErrorCodes.XML_MISSING_MANDATORY_ELEMENT_6,
"SIF_Request/SIF_MaxBufferSize is a mandatory element",
fZone);
}
maxBufSize = maximumBufferSize.Value;
if (maxBufSize < 4096 || maxBufSize > Int32.MaxValue)
{
throw new SifException
(
SifErrorCategoryCode.RequestResponse,
SifErrorCodes.REQRSP_UNSUPPORTED_MAXBUFFERSIZE_8,
"Invalid SIF_MaxBufferSize value (" + maxBufSize + ")",
"Acceptable range is 4096 to " + Int32.MaxValue,
fZone);
}
// Check to see if the Context is supported
try
{
IList<SifContext> contexts = req.SifContexts;
}
catch (AdkNotSupportedException contextNotSupported)
{
throw new SifException(
SifErrorCategoryCode.Generic,
SifErrorCodes.GENERIC_CONTEXT_NOT_SUPPORTED_4,
contextNotSupported.Message, fZone);
}
// Lookup the SIF_QueryObject
q = req.SIF_Query;
if (q == null)
{
// If it's a SIF_ExtendedQuery or SIF_Example, throw the appropriate error
if (req.SIF_ExtendedQuery != null)
{
throw new SifException(
SifErrorCategoryCode.RequestResponse,
SifErrorCodes.REQRSP_NO_SUPPORT_FOR_SIF_EXT_QUERY,
"SIF_ExtendedQuery is not supported", fZone);
}
else
{
throw new SifException
(
SifErrorCategoryCode.Xml,
SifErrorCodes.XML_MISSING_MANDATORY_ELEMENT_6,
"SIF_Request/SIF_Query is a mandatory element",
fZone);
}
}
qo = q.SIF_QueryObject;
if (qo == null)
{
rethrow = true;
throw new SifException
(
SifErrorCategoryCode.Xml,
SifErrorCodes.XML_MISSING_MANDATORY_ELEMENT_6,
"SIF_Query/SIF_QueryObject is a mandatory element",
fZone);
}
// Lookup the ElementDef for the requested object type
typ = Adk.Dtd.LookupElementDef(qo.ObjectName);
if (typ == null)
{
throw new SifException
(
SifErrorCategoryCode.RequestResponse,
SifErrorCodes.REQRSP_INVALID_OBJ_3,
"Agent does not support this object type: " + qo.ObjectName,
fZone);
}
}
catch (SifException se)
{
if (!rethrow)
{
sendErrorResponse(req, se, renderAsVer, maxBufSize);
}
// rethrow all errors at this point
throw se;
// // Capture the SifException so it can be written to the output stream
// // and thus returned as the payload of the SIF_Response message later
// // in this function.
// error = se;
// fZone.Log.Error("Error in dispatchRequest that will be put into the SIF_Response", se);
}
// For now, SIFContext is not repeatable in SIF Requests
SifContext requestContext = req.SifContexts[0];
Object target = null;
//
// Lookup the Publisher for this object type using Topics,
// but only if the context is the Default context
//
if (typ != null && SifContext.DEFAULT.Equals(requestContext))
{
ITopic topic = null;
topic = fZone.Agent.TopicFactory.LookupInstance(typ, requestContext);
if (topic != null)
{
target = topic.GetPublisher();
}
}
if (target == null)
{
target = fZone.GetPublisher(requestContext, typ);
if (target == null)
{
//
// No Publisher message handler found. Try calling the Undeliverable-
// MessageHandler for the zone or agent. If none is registered,
// return an error SIF_Ack indicating the object type is not
// supported.
//
Boolean handled = false;
IUndeliverableMessageHandler errHandler = fZone.ErrorHandler;
if (errHandler != null)
{
SifMessageInfo msginfo = new SifMessageInfo(req, fZone);
handled = errHandler.OnDispatchError(req, fZone, msginfo);
// Notify MessagingListeners...
foreach (IMessagingListener ml in GetMessagingListeners(fZone))
{
ml.OnMessageProcessed(SifMessageType.SIF_Request, msginfo);
}
}
if (!handled)
{
fZone.Log.Warn("Received a SIF_Request for " + qo.ObjectName + " (MsgId=" + req.MsgId + "), but no Publisher object is registered to handle it");
SifException sifEx = new SifException(
SifErrorCategoryCode.RequestResponse,
SifErrorCodes.REQRSP_INVALID_OBJ_3,
"Agent does not support this object type",
qo.ObjectName, fZone);
sendErrorResponse(req, sifEx, renderAsVer, maxBufSize);
throw sifEx;
}
else
{
#if PROFILED
( BuildOptions.PROFILED )
ProfilerUtils.profileStop();
#endif
return;
}
}
}
//bool success;
DataObjectOutputStreamImpl outStream = null;
SifMessageInfo msgInfo = new SifMessageInfo(req, fZone);
Query query = null;
try
{
// Convert SIF_Request/SIF_Query into a Query object
if (q != null)
{
query = new Query(q);
}
msgInfo.SIFRequestObjectType = typ;
}
catch (Exception thr)
{
fZone.Log.Debug(thr.ToString());
SifException sifEx =
new SifException
(SifErrorCategoryCode.Xml, SifErrorCodes.XML_MALFORMED_2,
"Could not parse SIF_Query element", thr.Message, fZone, thr);
sendErrorResponse(req, sifEx, renderAsVer, maxBufSize);
throw sifEx;
}
try
{
outStream = DataObjectOutputStreamImpl.NewInstance();
outStream.Initialize
(
fZone,
query,
req.SourceId,
req.MsgId,
renderAsVer,
maxBufSize );
// Call the agent-supplied Publisher, or if we have an error, write
// that error to the output stream instead
((IPublisher)target).OnRequest(outStream, query, fZone, msgInfo);
// Notify MessagingListeners...
NotifyMessagingListeners_OnMessageProcessed
(SifMessageType.SIF_Request, msgInfo);
}
catch (SifException se)
{
// For a SIF_Request, a SifException (other than a Transport Error)
// does not mean to return an error ack but instead to return a
// valid SIF_Response with a SIF_Error payload (see the SIF
// Specification). Transport Errors must be returned to the ZIS so
// that the message will be retried later.
//
if (se.Retry || se.ErrorCategory == SifErrorCategoryCode.Transport)
{
//success = false;
//retry was requested, so we have to tell the output stream to not send an empty response
outStream.DeferResponse();
throw;
}
outStream.SetError(se.Error);
}
catch (AdkException adke)
{
// If retry requested, throw a Transport Error back to the ZIS
// instead of returning a SIF_Error in the SIF_Response payload
if (adke.Retry)
{
//success = false;
//retry was requested, so we have to tell the output stream to not send an empty response
outStream.DeferResponse();
throw;
}
// Return SIF_Error payload in SIF_Response
SIF_Error err = new SIF_Error();
err.SIF_Category = (int)SifErrorCategoryCode.Generic;
err.SIF_Code = SifErrorCodes.GENERIC_GENERIC_ERROR_1;
err.SIF_Desc = adke.Message;
outStream.SetError(err);
}
catch (Exception thr)
{
SIF_Error err = new SIF_Error();
err.SIF_Category = (int)SifErrorCategoryCode.Generic;
err.SIF_Code = SifErrorCodes.GENERIC_GENERIC_ERROR_1;
err.SIF_Desc = "Agent could not process the SIF_Request at this time";
err.SIF_ExtendedDesc = "Exception in " +
"Publisher.onRequest" +
" message handler: " + thr.ToString();
outStream.SetError(err);
}
finally
{
try
{
outStream.Close();
}
catch
{
// Do Nothing
}
try
{
outStream.Commit();
}
catch
{
/* Do Nothing */
}
#if PROFILED
ProfilerUtils.profileStop();
#endif
outStream.Dispose();
}
}
private void SetRequestPolicy( SIF_Request request, IZone zone )
{
SIF_Query query = request.SIF_Query;
if( query == null ) {
// SIF_ExtendedQuery and SIF_Example are not supported by ADK Policy yet
return;
}
//
// Object Request Policy
//
// Determine if there is policy in effect for this Query
//
String objectName = query.SIF_QueryObject.ObjectName;
ObjectRequestPolicy requestPolicy = fPolicyFactory.GetRequestPolicy( zone, objectName );
if( requestPolicy != null ){
//
// SIF_Request/SIF_Version policy
//
String requestVersions = requestPolicy.RequestVersion;
if( requestVersions != null ){
if( (Adk.Debug & AdkDebugFlags.Policy ) > 0 ){
zone.Log.Info( "POLICY: Setting SIF_Request/SIF_Version to " + requestVersions );
}
// Clear the list of SIF Versions
foreach( SIF_Version existingVersion in request.GetSIF_Versions() ){
request.RemoveChild( existingVersion );
}
// The version will be a comma-delimited list. Set each of these
// as SIF_Version elements, but also try to derive the most logical
// version element to set the SIF Message/@Version attribute to
// NOTE: Someone could theoretically set versions incorrectly, such
// as "1.1,1.5r1". Multiple SIF_Version elements are not supported in
// SIF 1.x, but we won't bother with validating incorrect settings. Policy
// is power in the configurator's hands to use or abuse.
String[] versions = requestVersions.Split( ',' );
String lowestVersion = versions[0];
foreach( String version in versions ){
String ver = version.Trim();
request.AddSIF_Version(new SIF_Version(ver));
if (lowestVersion.CompareTo(ver) > 0)
{
lowestVersion = ver;
}
}
// Determine how the SIF_Message/@Version should be set to
// * If the policy is set to a single version, use it
// * If a list, use the lowest
// * If *, ignore
// * if [major].*, use the lowest version supported
if( lowestVersion.Length > 0 ){
SifVersion newMsgVersion = null;
if( lowestVersion.EndsWith( "*" ) ){
try
{
// 2.*, requests go out with a message version of 2.0r1
int major = int.Parse( lowestVersion.Substring( 0, 1 ) );
newMsgVersion = SifVersion.GetEarliest( major );
} catch( FormatException iae ){
zone.Log.Warn(
"POLICY: Error parsing ObjectRequestPolicy version '" +
requestVersions + "' : " +
iae.Message, iae );
}
} else {
try
{
newMsgVersion = SifVersion.Parse( lowestVersion );
} catch( FormatException iae ){
zone.Log.Warn(
"POLICY: Error parsing ObjectRequestPolicy version '" +
requestVersions + "' : " +
iae.Message, iae );
}
}
if( newMsgVersion != null ){
if( (Adk.Debug & AdkDebugFlags.Policy ) > 0 ){
zone.Log.Info( "POLICY: Setting SIF_Messaage/@Version to " + newMsgVersion );
}
request.SifVersion = newMsgVersion;
}
}
}
//
// SIF_DestinationID policy
//
String requestSourceId = requestPolicy.RequestSourceId ;
if( requestSourceId != null ){
if( (Adk.Debug & AdkDebugFlags.Policy) > 0 ){
zone.Log.Info( "POLICY: Setting SIF_Request SIF_DestinationID to " + requestPolicy.RequestSourceId );
}
request.SIF_Header.SIF_DestinationId = requestSourceId;
}
}
}
