Project 3: Find the Weather for a City

Goals

There are two general goals for this project:

• Client-Server communication.
• Multi-threading.

General Requirements

Server

You will build a weather server on your local machine. The requirements for the server are:

• Upon client's request, the server replies with the client the current weather information for that city (as a minimum, you should report the temperature).
• The server should accept as many simultaneous client requests as your machine can handle. Your machine will have a limit on the numkber of threads that you can create. You can assume that 50 is the lowest limit.
• The server should maintain a cache that stores the current weather information.
• If a request for a certain city is in progress, other reqests on the same city should wait for that request to complete and then use the newly cached value.
• In case a web page is unavailable, a message should be passed back to the client telling the client information not available. The information in cache should be marked as not available. The server will try one of the waiting clients' requests to the web server, until either a vaid webpage passed back, or all the clients's requests fail. Again, as long as no valid information passed back by the web server, the information of that city needs to be marked as unavailable.

Client

The client should have text fields that can be used to specify a city and a refresh button.

As an example, the weather underground supports several request formats. One is using state and city name. For example, albuquerque will be requested as:
http://banners.wunderground.com/banner/infoboxtr_both/US/NM/Albuquerque.gif

In this case, you need two text fields: one for the the state (NM) and another for the the city name (Albuquerque). You have the choices of using which weather web server and which information used to retrieve the weather information. Please state how to enter input to your program in your readme.

The refresh button is for user to click on to get new information. Your GUI for display weather information will be refreshed every time a user presses the refresh button. This means that the client will send a request to the server everytime the refresh button is pressed.

How your program should run

The server will be started using the following command:
java Server

The client will be started with:
java Client

Deliverables

• Server.java
• Client.java
• Other java classes as needed
• readme

Note: your readme file should include a clear description of how the program should be run.