/// <summary> Handles SIF_Responses
/// </summary>
public virtual void OnQueryResults(IDataObjectInputStream in_Renamed,
SIF_Error error,
IZone zone,
IMessageInfo inf)
{
SifMessageInfo info = (SifMessageInfo)inf;
Console.WriteLine
("\nReceived a query response from agent \"" + info.SourceId + "\" in zone " +
zone.ZoneId);
IRequestInfo reqInfo = info.SIFRequestInfo;
if (reqInfo != null)
{
Console.WriteLine
("\nResponse was received in {0}. Object State is '{1}'",
DateTime.Now.Subtract(reqInfo.RequestTime), reqInfo.UserData);
}
//
// Use the Mappings class to translate the StudentPersonal objects received
// from the zone into a HashMap of field/value pairs, then dump the table
// to System.out
//
// Always check for an error response
if (error != null)
{
Console.WriteLine
("The request for StudentPersonal failed with an error from the provider:");
Console.WriteLine
(" [Category=" + error.SIF_Category + "; Code=" + error.SIF_Code + "]: " +
error.SIF_Desc + ". " + error.SIF_ExtendedDesc);
return;
}
// Get the root Mappings object from the configuration file
Edustructures.SifWorks.Tools.Mapping.Mappings m = fCfg.Mappings.GetMappings("Default");
// Ask the root Mappings instance to select a Mappings from its
// hierarchy. For example, you might have customized the agent.cfg
// file with mappings specific to zones, versions of SIF, or
// requesting agents. The Mappings.select() method will select
// the most appropriate instance from the hierarchy given the
// three parameters passed to it.
//
SifFormatter textFormatter = Adk.Dtd.GetFormatter(info.SifVersion);
MappingsContext context =
m.SelectInbound(StudentDTD.STUDENTPERSONAL, info);
while (in_Renamed.Available)
{
StudentPersonal sp = (StudentPersonal)in_Renamed.ReadDataObject();
// Ask the Mappings object to populate a HashMap with field/value pairs
// by using the mapping rules in the configuration file to decompose
// the StudentPersonal object into field values.
//
Hashtable data = new Hashtable();
StringMapAdaptor sma = new StringMapAdaptor(data, textFormatter);
context.Map(sp, sma);
// Now dump the field/value pairs to System.out
DumpDictionaryToConsole(data);
}
}
/// <summary> Respond to SIF RequestsGetTopicMap
/// </summary>
public virtual void OnRequest(IDataObjectOutputStream outStream,
Query query,
IZone zone,
IMessageInfo inf)
{
SifMessageInfo info = (SifMessageInfo)inf;
SifWriter debug = new SifWriter(Console.Out);
Console.WriteLine
("Received a request for " + query.ObjectTag + " from agent \"" + info.SourceId +
"\" in zone " + zone.ZoneId);
// Read all students from the database to populate a HashMap of
// field/value pairs. The field names can be whatever we choose as long
// as they match the field names used in the <mappings> section of the
// agent.cfg configuration file. Each time a record is read, convert it
// to a StudentPersonal object using the Mappings class and stream it to
// the supplied output stream.
//
IDbCommand command = null;
// Set a basic filter on the outgoing data stream
// What will happen is that any object written to the output stream will
// be evaluated based on the query conditions. If the object doesn't meet the
// query conditions, it will be excluded
outStream.Filter = query;
// Get the root Mappings object from the configuration file
Edustructures.SifWorks.Tools.Mapping.Mappings m = fCfg.Mappings.GetMappings("Default");
// Ask the root Mappings instance to select a Mappings from its
// hierarchy. For example, you might have customized the agent.cfg
// file with mappings specific to zones, versions of SIF, or
// requesting agents. The Mappings.select() method will select
// the most appropriate instance from the hierarchy given the
// three parameters passed to it.
//
//IDictionary<string, string> dataMap = new System.Collections.Generic.Dictionary<string, string>();
// IFieldAdaptor adaptor = new StringMapAdaptor(dataMap);
//m.MapOutbound();
MappingsContext mc = m.SelectOutbound(StudentDTD.STUDENTPERSONAL, info);
try {
int count = 0;
// Query the database for all students
command = fConn.CreateCommand();
fConn.Open();
command.CommandText = "SELECT * FROM Students";
using (IDataReader rs = command.ExecuteReader(CommandBehavior.CloseConnection)) {
DataReaderAdaptor dra = new DataReaderAdaptor(rs);
while (rs.Read())
{
// Finally, create a new StudentPersonal object and ask the
// Mappings to populate it with SIF elements from the HashMap
// of field/value pairs. As long as there is an <object>/<field>
// definition for each entry in the HashMap, the ADK will take
// care of producing the appropriate SIF element/attribute in
// the StudentPersonal object.
//
StudentPersonal sp = new StudentPersonal();
sp.RefId = Adk.MakeGuid();
// TODO: When using custom macros for outboud mapping operations, set the ValueBuilder.
// You will need to call SetValueBuilder() giving the MappingsContext a derived version
// of DefaultValueBuilder that has the macro methods available in it.
mc.SetValueBuilder(new DataUtilMacro(dra));
mc.Map(sp, dra);
// Now write out the StudentPersonal to the output stream and
// we're done publishing this student.
//
Console.WriteLine("\nThe agent has read these values from the database:");
DumpFieldsToConsole(rs);
Console.WriteLine("To produce this StudentPersonal object:");
debug.Write(sp);
debug.Flush();
outStream.Write(sp);
}
rs.Close();
}
Console.WriteLine
("- Returned " + count + " records from the Student database in response");
} catch (Exception ex) {
Console.WriteLine("- Returning a SIF_Error response: " + ex);
throw new SifException
(SifErrorCategoryCode.RequestResponse, SifErrorCodes.REQRSP_GENERIC_ERROR_1,
"An error occurred while querying the database for students", ex.ToString(), zone);
} finally {
if (command != null)
{
try {
fConn.Close();
} catch (Exception ignored) {
Log.Warn(ignored.Message, ignored);
}
}
}
}
