Developing A Simple MTS Server Component
Gopalan Suresh Raj

The ClickServer has an Increment() method. Clients call this method and pass in an integer argument. All this server component does is increment the value passed in and return it back to the client.

The Steps involved in developing the MTS Server component are

1. Create a new COM DLL project
2. Add MTS aware code to the project's class
3. Mark the class as COM/MTS-enabled
4. Build the project
5. Deploy the DLL into The Microsoft Transaction Server

1. Create a new COM DLL project
An MTS component should always be packaged as a DLL. Select New Project and from the File menu, choose the COM DLL project template in Visual J++. Name the project ClickServer.

2. Add MTS aware code to the project's class
Rename the default Class1.java to ClickServer.java in the Project Explorer and change the contents of the file to the following code:

import com.ms.mtx.*;
public class ClickServer {

 public int Increment(int value)  {
  IObjectContext context = null;
  boolean        success = false;
  long           result  = -1;

  try   {
   // Get MTS context and set the return data
   context = (IObjectContext) MTx.GetObjectContext();
   result = ++value;
   success = true;
  }
  catch(Exception e){ success = false; }
  finally   {
   if(success)
    context.SetComplete(); // No errors. Complete transaction.
   else
    context.SetAbort(); // Error occurred. Abort transaction.
  }
  return result;
 }

}
 
3. Mark the class as COM/MTS-enabled
To deploy the class in MTS, you need to make it a COM/MTS class. You can easily make it one by right-clicking the mouse on the ClickServer class from the Class Outline tab and Selecting Class Properties. Mark the MTS Support as Enabled and say OK.

Figure : Mark the Class as COM/MTS enabled

You will immediately notice that some code similar to this is added to the ClickServer class

/**
* @com.register ( clsid=CF198348-CBB2-11D2-B9C7-006097A7D34F, typelib=CF198349-CBB2-11D2-B9C7-006097A7D34F )
* @com.transaction (required)
*/
 
The final code looks like this:

4. Build the project
Select the Build menu and Build the project. This creates an MTS component DLL called ClickServer.dll. This contains both the ClickServer.class and all the appropriate stub code so that the DLL can be registered and deployed in MTS.

5. Deploy the DLL into The Microsoft Transaction Server
Start up the MTS Explorer. Go to the computer you want to install your component on and select "Packages Installed". Right click and create a New empty Package called ClickServer. Select the newly created ClickServer package and create a New Component. Select the Component through the Browse button into MTS. (Make sure you Install New Component rather than Import Components...) The ClickServer MTS Server component is now deployed on MTS and is ready for client invocations.