The project in this folder contains examples for socket programming.
During class, we will focus on the implementation of a simple echo server (and client) in order to learn the basics of Java socket programming.
Have a look at the socket.trivial.echo package to see a preview.
We will also deepen serialization and deserialization by looking at practical
examples (see SerdeTest in the src/test/... directory).
As the final part of the exercise, we will analyze the socket.chat package.
It contains a client/server implementation of our beloved chat.
The implementation follows the MVC pattern and distributes it over the client and the server.
Remember that the MVC pattern identifies three entities:
- The model: hold all the state and application logic
- The view: gives a representation of the model
- The controller: maps the user input from the view to state changes in the model
When the MVC is distributed, one must decide where to split and introduce a networking layer to make the method calls become remote. It seems natural (and I did so with the chat) to split the Controller into a client-side and a server-side part.
By splitting, we also intercept the edge that connects the Model and the View. That edge is really important because it handles the notifications that the Model sends to its observer.
If you have a look at the code you can see that we have two controllers ---
ClientController and ServerController --- but also that we had to implement
the notification behavior in the network package.
You are highly encouraged to have a look at the network package and try to
understand by yourself what I did (hint:
command and
visitor patterns).
For what concerns the Model, I reused the code developed during the last
lecture, in the chat project. If you have a look at the pom.xml, you can see
that this project depends on it:
...
<dependency>
<groupId>deib.ingsoft18</groupId>
<artifactId>chat</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
...
Be sure of running mvn install in the chat before building this project.