1. Message-Passing Communication Analyzer By Poonam Bijlani CSE 775- Distributed Objects Prof. Jim Fawcett

2. Project Overview
The message passing Communication Analyzer is implemented as a two way communication subsystem using .NET Remoting.
Xml Messages are passed between the client and server.
The system can be configured in any of the following activation modes:
Singleton – one object for all clients
Single Call – one object created for each call to the server
Client Activated – one object for each client
Configuration files are used to establish any of the activation modes

3. Project Overview..contd
Sponsors are implemented to prevent the communication object from timing out if it is implemented as singleton or client activated.
Average time to service a message is found by sending a stream of continuous messages between client and server.

4. Context Diagram Communication using .Net Remoting Xml Messages
I/P
User
Interface
Marshal
ByRef
Input and
Client
Proxy
Server
Output
O/P
Object
Errors
Errors
Errors
Errors

5. GUI

6. Client Classes

7. Server Classes

8. Configuration files, Controls and Interfaces
Configuration Files used to set the remoting infrastructure between client and server. Also used to set the activation model.
Controls
XML Generator: Generates XML messages of required size
HiRes Timer: Calculates the time, in microseconds, to send and receive a message from the client to the server and back.
Interfaces
ILease and ISponsor: Used for Lifetime management of Client Activated and Singleton Objects

9. Sponsors
.NET Remoting uses a lease-based form of distributed garbage collection to manage the lifetime of remote objects.
MyClientSponsor Class on the client side is used to renew the lease for Singleton and Client Activated objects after they have expired
The sponsor implements the ISponsor interface and registers the Sponsor using the Register( ) method of the ILease interface.
The Lease Manager calls the renewal( ) method to renew the lifetime of the objects. I have used a time span of 20 seconds which means that the Lease Manager renews the objects lease time by 20 seconds each time it calls the renewal ( ) method.

10. Client- Thread and Queues
Send Queue
Receive Queue
Threads
Main Thread- Handles GUI and queues request for server
Communication Thread: Takes care of communication
Receive Thread: De-queues messages posted by the communication thread and populates GUI

11. Server – Threads and Queues
Send Queue
Receive Queue
Blocking Queues implemented on both client and server to avoid wasting CPU cycles
Threads
Communication Thread- Takes care of communication
Worker Thread- Responsible for serving the Client’s requests

12. Communication Subsystem
SERVER
Communication
Communication
CLIENT
Thread
Thread
RECIEVE Q
Child Thread
SEND Q
dequeues,
processes request
enqueues
Main Thread
response
XML MESSAGES
RECIEVE Q
Main Thread
enqueues server
Receiver
requests/
Thread
notifications
SEND Q
Singleton/
SingleCall/
ClientActivated
Remotable
Object

13. Client Activity Diagram

14. Server Activity

15. Event Trace Diagram

16. Singleton – 1 Client

17. Single Call – 1 Client

18. Client Activated – 1 Client

19. Comparative Graph- 1 Client

20. Singleton – Multi Client

21. Single Call – Multi Client

22. Client Activated – Multi Client

23. Comparative Graph- Multi Client

24. Uses
Calculate performance of distributed applications using messages up to 100Kb eg. Chat Applications
Can be modified by using PassByReference file transfer to measure the performance of distributed file systems, eg. FTP
Can be used to compare speeds of different networks eg. Dial-up, Broadband etc.

25. Conclusion
A message passing communication analyzer was successfully built and implemented using .NET remoting
Further, it was operated in three modes: Singleton, Single Call and Client Activated
A HiRes Timer was used to analyze the performance of the system with increasing message sizes for a single client and up to 8 clients for a single message size.
Tests indicated that distributed applications where state preservation is not required, a client activated object should be preferred over Single Call.
Further choice of activation mode depends on the specific requirements of the application under consideration.

26. Thank You
Questions?