CMPUT 379: The Client-Server Model - IT Assignment Help

Assignment Task:

The client-server model is a distributed application structure that partitions tasks or workloads between the providers of a resource or service, called servers, and service requesters called clients. Often clients and servers communicate over a computer network on separate hardware, but both client and server may reside in the same system. A server host runs one or more server programs, which share their resources with clients. A client does not share any of its resources, but it requests content or service from a server. Clients therefore initiate communication sessions with servers, which await incoming requests. Examples of computer applications that use the client–server model are Email, network printing, and the World Wide Web.

Sample Output

Note the following in the output below:
• Log file times are actual times (UNIX Epoch times), with two decimal places for the partial seconds. Epoch times can be converted to normal dates, for example using the converter at www.epochconverter.com.
• Each client records all its Trans calls – when sent to the server and when the server acknowledges that the transaction is complete.
• Each client records when it does a Sleep.
• In the log file, T=Trans, S=Sleep, and D=Done.
• The server gives each transaction it receives a unique # (starting at 1). The server puts the transaction number in its log file, and sends the transaction number back to the client (a receipt acknowledging completion of the transaction).
• The semantics of T and S events are exactly the same as in Assignment 2.
• Clients do not do any work between the sending of a transaction request (T) to the server and the acknowledgement that the transaction is done (D). In the real world, the client might itself be a multi-threaded program, dealing with other requests while it waits for a transaction to complete (that is NOT part of this assignment).
• Note the impact of long transactions on the client and on the server. Some of this overhead could be mitigated if the server was multi-threaded (as in Assignment 2), but that is NOT part of this assignment.

Warning

There are two caveats you should be careful to watch for when testing your program:
• Two users might unwittingly use the same port number on the same machine. If something goes wrong, try changing your port number.
• Although the client should be able to connect to a server on any machine, this might not be possible for a machine outside the undergraduate lab environment. Because of security measures (including restrictions on port usage and firewalls), your program might not be able to make the connections needed.

Grading
Here are some important things to watch out for:
• The client and server must execute as separate processes.
• Your program should work with multiple concurrent client processes
• Be careful about boundary conditions.
• Your makefile should do the minimum amount of work required to produce therequisite executables.
• Do not leave any processes running after you log out. Students who leave processes running – any time before the assignment deadline – will be penalized.

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