Writing a server in c

I agree that the reality of the situation is that it's abstracted away enough that the distinction isn't really all that meaningful. You do not need to use boot2docker or any other VM. You can't run any containers on osx, but docker itself runs fine as a client binary to docker running on a linux server. I use this configuration daily using a native osx docker binary on my workstation speaking TLS to a docker service running on a CoreOS server.

Writing a server in c

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The client program is implemented by a single class, KnockKnockClientand is very similar to the EchoClient example from the previous section. The server program is implemented by two classes: KnockKnockServer, which is similar to EchoServercontains the main method for the server program and performs the work of listening to the port, establishing connections, and reading from and writing to the socket.

The class KnockKnockProtocol serves up the jokes. It keeps track of the current joke, the current state sent knock knock, sent clue, and so onand returns the various text pieces of the joke depending on the current state.

This object implements the protocol—the language that the client and server have agreed to use to communicate. The following section looks in detail at each class in both the client and the server and then shows you how to run them.

The server program begins by creating a new ServerSocket object to listen on a specific port see the statement in bold in the following code segment.

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When running this server, choose a port that is not already dedicated to some other service. For example, this command starts the server program KnockKnockServer so that it listens on port The constructor for ServerSocket throws an exception if it can't listen on the specified port for example, the port is already being used.

In this case, the KnockKnockServer has no choice but to exit. If the server successfully binds to its port, then the ServerSocket object is successfully created and the server continues to the next step—accepting a connection from a client the next statement in the try-with-resources statement: Let's assume that you ran the server program KnockKnockServer on the computer named knockknockserver.

In this example, the server is running on the port number specified by the first command-line argument. When a connection is requested and successfully established, the accept method returns a new Socket object which is bound to the same local port and has its remote address and remote port set to that of the client.

The server can communicate with the client over this new Socket and continue to listen for client connection requests on the original ServerSocket This particular version of the program doesn't listen for more client connection requests. However, a modified version of the program is provided in Supporting Multiple Clients.

After the server successfully establishes a connection with a client, it communicates with the client using this code: Gets the socket's input and output stream and opens readers and writers on them.

Initiates communication with the client by writing to the socket shown in bold. Communicates with the client by reading from and writing to the socket the while loop.

Step 1 is already familiar.

writing a server in c

Step 2 is shown in bold and is worth a few comments. The bold statements in the code segment above initiate the conversation with the client. The code creates a KnockKnockProtocol object—the object that keeps track of the current joke, the current state within the joke, and so on.

After the KnockKnockProtocol is created, the code calls KnockKnockProtocol's processInput method to get the first message that the server sends to the client. For this example, the first thing that the server says is "Knock!

Step 3 is encoded in the while loop.

writing a server in c

As long as the client and server still have something to say to each other, the server reads from and writes to the socket, sending messages back and forth between the client and the server.

The server initiated the conversation with a "Knock! The readLine method waits until the client responds by writing something to its output stream the server's input stream. When the client responds, the server passes the client's response to the KnockKnockProtocol object and asks the KnockKnockProtocol object for a suitable reply.

About Cal Evans The server is built with an asynchronous socket, so execution of the server application is not suspended while it waits for a connection from a client. The application receives a string from the client, displays the string on the console, and then echoes the string back to the client.

The server immediately sends the reply to the client via the output stream connected to the socket, using a call to println. If the server's response generated from the KnockKnockServer object is "Bye. The Java runtime automatically closes the input and output streams, the client socket, and the server socket because they have been created in the try-with-resources statement.Create a new spreadsheet and edit with others at the same time -- from your computer, phone or tablet.

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