Objectives
This assessment item is designed to test your understanding in Java UDP networking, file reading and writing using client/server application development.
Assessment task Your task for this assignment is, to design and implement UDP (User Datagram Protocol) API Socket in a client/server model. In java Datagram Socket uses connectionless protocol with basic send and receive methods. This assignment is built on the learning outcomes from the supplied code for UDPClient and UDPServer from week2 lecture and tutorial materials.
The UDPClient can send offline text messages to the UDP server and because this protocol is not reliable the server should acknowledge the sender that it has received the message. Multiple clients should be able to send messages to the server and no threading is required on the server. The server waits constantly receiving and acknowledging the clients for the messages it receives. When a message is received by the server the IP address of the client socket is used to determine the client’s location. However multiple clients can also connect from same location when all the clients and the server are running locally on the same machine. So we distinguish each of them by a location which the user needs to enter before the interaction can start with the server. The client should only be able to transmit messages after entering a valid location. A valid name can be any alphanumeric but cannot be empty. The UDPClient should be able to continuously chat to the UDPServer. The server should store all the messages received in to an ArrayList and a timer should be set up to write contents of the ArrayList to a file.
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