![]() Nor is it an alternative to package diagrams. The goal of a component diagram is not the same than a class diagram. I know it's no longer a single question but am I completely wrong and should anyway always model the public API and the implementation in the same component? Is the only feasable way to use a simple dependency connector? Or how would I show that the dependency is bound to an interface which is inside the component A? So for a component A containing the public interfaces for an API I want to show that another component B depends on this component A. Up unitl now I misused the ball notation (provided interface) to show that a component provides the interface definition itself instead of the realization of it. How can I show the relationship of iDefineFoo component which contains the Foo interface definition? Should it always be hidden However if I use the ball/socket notation, the Foo interface is the ball/socket or in other words it's no longer shown where this interface is defined: I can create three components in a higher abstraction diagram each containing one of the pieces (and others) from the above diagram and the same relationship connectors. Now I am confused by the different ways of drawing interface relationships in two regards (I think the answers to these are closely related): While ((inputLine = in.I recently found out that I have probably been using ball/socket notation in a wrong way all the time. KnockKnockProtocol kkp = new KnockKnockProtocol() New InputStreamReader(clientSocket.getInputStream())) New PrintWriter(clientSocket.getOutputStream(), true) However, a modified version of the program is provided inĪfter the server successfully establishes a connection with a client, it communicates with the client using this code: ![]() 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. Socket object which is bound to the same local port and has its remote address and remote port set to that of the client. When a connection is requested and successfully established, the accept method returns a new (Let's assume that you ran the server program KnockKnockServer on the computer named .) In this example, the server is running on the port number specified by the first command-line argument. For example, this command starts the server program KnockKnockServer so that it listens on port 4444:Īccept method waits until a client starts up and requests a connection on the host and port of this server. ![]() ![]() When running this server, choose a port that is not already dedicated to some other service. ServerSocket object to listen on a specific port (see the statement in bold in the following code segment). The server program begins by creating a new This section walks through the code that implements the Knock Knock server program, The following section looks in detail at each class in both the client and the server and then shows you how to run them. This object implements the protocol-the language that the client and server have agreed to use to communicate. It keeps track of the current joke, the current state (sent knock knock, sent clue, and so on), and returns the various text pieces of the joke depending on the current state. KnockKnockServer, which is similar toĮchoServer, contains 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 server program is implemented by two classes: KnockKnockClient, and is very similar to theĮchoClient example from the previous section. The client program is implemented by a single class, The example consists of two independently running Java programs: the client program and the server program. Server: "Knock knock!" Client: "Who's there?" Server: "Dexter." Client: "Dexter who?" Server: "Dexter halls with boughs of holly." Client: "Groan." Knock Knock jokes are favored by children and are usually vehicles for bad puns. The server in the client/server pair serves up Knock Knock jokes. This section shows you how to write a server and the client that goes with it.
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