Question

I am trying to set some session information in one web method and return it in another web method, but the session data is always empty on the second web method. Here is what I tried

Web Method 1 – Sets session information

Method StartSession() As %String [WebMethod]
{
     set %session.NewSession = 1
     set %session.Data("key") = "dude"
     Quit "Session Started"
}

Web Method 2 – Gets session information should return dude, but is returning blank

Method TestSession() As %String [WebMethod]
{
    Quit $Get(%session.Data("key"))         
}

Answer 1

As an alternative to psr’s answer another way to handle state is to use custom SOAP headers.

For example:

Create a class for your custom SOAP headers like below:

Class Headers.TimeStamp Extends %SOAP.Header
{
     Property TimeSent As %TimeStamp;    
}

In the web method do this:

set h=##class(Headers.TimeStamp).%New()
set h.TimeSent=$ZTIMESTAMP
do ..HeadersOut.SetAt(h,"Timestamp")

This will generate the following SOAP header:

  <SOAP-ENV:Header>
    <TimeStamp xmlns:hdr="http://www.myapp.org">
      <TimeSent>60712,70996.027Z</TimeSent>
    </TimeStamp>  
  </SOAP-ENV:Header>

This will allow state to be maintained within the SOAP headers rather than using Cache’s session management.