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

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

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.

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

GUI

Client Classes

Server Classes

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

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.

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

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

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

Client Activity Diagram

Server Activity

Event Trace Diagram

Singleton – 1 Client

Single Call – 1 Client

Client Activated – 1 Client

Comparative Graph- 1 Client

Singleton – Multi Client

Single Call – Multi Client

Client Activated – Multi Client

Comparative Graph- Multi Client

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.

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.

Thank You Questions?