Requirement: I need to expose a BizTalk Rest service with multiple Verbs (Get/Post/Update) to front end system. When front end system calls BizTalk Rest service, for each Operation (Get/Post/Update) I need to construct request message to send to backend system and get the response back and need to construct response map and send the response back to Front End.
Solution1: For each operation I need to construct 2 maps (Request and Response) and 1 Orchestration, if I have 10 Get operations, I need to create 10 Orchestrations.
Solution2: Using BizTalk dynamic Maps concept, we can use single orchestration to call the maps dynamically from Orchestration.
We need to follow below steps in orchestration.
- After receiving the message using Receive shape, we need to take an expression shape to extract the Operation name and assign to a string variable.
Expression Shape:
Operation = RequestMessage(BTS.Operation);
//Operation is a string variable
//RequestMessage is the message type of receive shape.
//BTS.Operation is the context property and this value will be assigned in the Receive location for each operation.
// Pass the Operation name (which is extracted above) as input parameter to a C# component to get fully qualified request Map name.
requestMapName = varGetMapName.GetRequestMapName(Operation);
//requestMapName is a string variable
//varGetMapName is a variable of type C# Class where we have GetRequestMapName method.
- Take Message Assignment Shape and write below code
mapType = System.Type.GetType(requestMapName);
transform(QueryRequest) = mapType(EnquiryRequest);
//mapType is a variable of type “System.Type”
// EnquiryRequest is a message which we receive in Receive Shape
// QueryRequest is a message which we construct (Backend system request message)
- Take Send shape to send the above constructed message to Backend system through logical request and response port.
- Take the Receive shape to get the backend system response.
- Take Expression shape and write below code
ResponseMapName = varGetMapName.GetResponseMapName(Operation);
//ResponseMapName is a string variable
//varGetMapName is a variable of type C# Class where we have GetResponseMapName method.
- Take Message Assignment Shape and write below code.
mapType = System.Type.GetType(responseMapName);
transform(EnquiryResponse) = mapType(QueryResponse);
//mapType is a variable of type “System.Type”
// EnquiryResponse is a message which we send to front end system.
// QueryResponse is a response message which we receive from Backend system
- Send the above constructed response message to Front end system.
//C# method to get the Request Map name based on QueryType
public string GetRequestMapName(String QueryType)
{
string MapName = string.Empty;
switch (QueryType)
{
case “Sample1”:
MapName = “BizTalk.Sample.InternalRequest, BizTalk.Sample.Maps, Version=1.0.0.0, Culture=neutral, PublicKeyToken=4f9ac75c4a70e419”
break;
case “Sample2”:
MapName = “Fully Qualified Map Name”
break;
case “Sample3”:
MapName = “Fully Qualified Map Name”
break;
}
return MapName;
}
//C# method to get the Response Map name based on QueryType
public string GetResponseMapName(String QueryType)
{
string MapName = string.Empty;
switch (QueryType)
{
case “Sample1”:
MapName = “Fully Qualified Map Name”
break;
case “Sample2”:
MapName = “Fully Qualified Map Name”
break;
case “Sample3”:
MapName = “Fully Qualified Map Name”
break;
}
return MapName;
}
BizTalk World 