UDP Programming Project with java

This week, we have been looking at using Java UDP Sockets to build networked applications. The example provided with this week’s lecture demonstrates some of the basic ideas for setting up a networked application using UDP in Java. This week’s programming assignment is to design and build a journal application using UDP. The journaling application is to be designed so that a client can access their journal entries from anywhere. They can store any text information in their journal. This journaling system should be set up to support the following operations:  The primary requirement for this lab is that you must use UDP for communications between the client and the server. All client journal entries must be saved to files. I am providing you with a Java class called: the JournalManager, which is designed to read and write journal entries to and from files. You should design your journal server to make use of this JournalManager class. You should spend some time thinking about how to design this application, with particular focus on the application protocol you will need to develop to support this application. Refer to the Application Protocol Design document provided with this week’s material. What can a client request? What replies can the server generate? What errors could occur that a client needs to know about? What information needs to be sent from the client to the server; from the server to the client? What is the maximum message size your client and server will be able to exchange? What is the structure of each message exchanged? How are you going to implement a structured message with a Datagram Packet? (Hint: I would suggest looking at the StringTokenizer class that is designed to break a String into a set of substrings.) What about synchronization? When will the client wait and for how long? When will the server wait and for how long? Remember, at this point, we are still basically working with a single threaded server, so while the server is servicing one client request, all other client requests are waiting. For the first part of the lab, I want you to capture the design of your message exchange in a written protocol specification. Be very specific about the structure of messages that will be exchanged. Define what values you are going to use as part of your message exchange. Fully define the message exchange scenarios. For instance, if the client sends message A, the server can respond with message B or C depending on how the server handles A. Include any possible error responses that could come back from the server. The protocol write-up should take no more than two pages. Include an event diagram that illustrates the message exchanges and the synchronization between clients and the server.   

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