package extjtech;

import java.io.*;
import com.sssw.rt.util.*;

// The ExtBusObj class shows how you can access a SilverStream
// server from an external Java client. It includes an example
// of invoking a SilverStream triggered business object to 
// execute business logic on the server and return the result
// to the client. 
public class ExtBusObj {

     // Instance variable for the SilverStream server session 
     // object used by the ExtBusObj class.
     AgrServerSession session;

  // Constructor for the ExtBusObj class. It does the following:
  // * Connects to a SilverStream server
  // * Invokes a triggered business object on that server
  // * Displays the result returned by that object (if any) 
  //
  // It takes 2 arguments:
  // 1 SilverStream server host
  //     myserver
  // 2 SilverStream db & business object
  //     mydb:com.myorg.busobj.boMyBusinessObject
  public ExtBusObj(String s3serverhost,  
                   String s3bolocation) {

    try  {
      // Initialize the SilverStream runtime environment. Do
      // this if you need to specify a login handler for the 
      // SilverStream server to call back when it requires user
      // authentication. (The login handler is a class that you
      // code and instantiate.)
      AgRuntime.init(new LoginHandler());

      // Connect to the appropriate SilverStream server. This
      // establishes a server session (represented by an instance
      // of AgrServerSession).
      //
      // The following example connects via HTTP, but it could  
      // use RMI-IIOP instead (if you code the connectRMI method
      // rather than connect).
      session = AgRuntime.connect(s3serverhost);


      // Invoke the specified business object (in the specified
      // database) on the SilverStream server.
      Object result;
      result = session.invokeBusinessObject(s3bolocation);

      // Display the string representation of the result returned
      // from the business object.
      System.out.println("Result of business object " +
                         s3bolocation + " is:");
      System.out.println(String.valueOf(result));
    }
    catch (Exception e) {
      System.out.println("Application error in ExtBusObj");
      e.printStackTrace();
      System.exit(0);
    }
    finally {
      // When all done, close the SilverStream server session.
      session.close();
    }
  }


  // Main method (used for application startup).
  public static void main(String[] args) {

    if (args.length < 2) {
      // Make sure all of the required command-line args
      // have been provided to the application. If not,
      // display an error message and terminate.
      System.out.println(
        "Missing Command-Line Arguments\n\n" +  
        "Required arguments:\n" +
          "1  SilverStream server host\n" +
          "2  SilverStream db & business object\n\n" +
        "Example:\n" + "java extjtech.ExtBusObj " +
          "myserver " +          
          "mydb:com.myorg.busobj.boMyBusinessObject");
      System.exit(0);
    }
    else {
      // Get the command-line args so the application can
      // pass them to the ExtBusObj constructor.
      String s3serverhost = args[0];
      String s3bolocation = args[1];

      // Create an instance of ExtBusObj. This executes the 
      // constructor for the class, which then accesses the
      // SilverStream server and invokes the requested
      // business object.
      ExtBusObj extbusobj = new ExtBusObj(s3serverhost,
                                          s3bolocation);
    }
  }
}