The intent of this section is to demonstrate how buffers and channels work together in more depth. We will use client and server applications that pass messages back and forth. Specifically, we will create a simple version of a chat server.
We will perform the following actions:
First, we will demonstrate using a fixed size message using the sendFixedLengthMessage and receiveFixedLengthMessage methods. Then we will use the sendMessage and receiveMessage methods to handle variable length messages. Fixed length messages are easier to handle but will not work if the length of a message exceeds the size of the buffer. Variable length messages require more careful handling than what we have seen in previous examples. These methods have been placed in a class called HelperMethods to enable their use in multiple applications.