bluebarca

hey everybody, hope u r all having a gr8 time!
i have 2 questions:
1st i have a socket lets a call it x that runs on a pc that acts as a server, when multiple clients try to connect and send data to this socket will there be a problem ( will the java code multithread automatically and manage) or should i implement my multithreading.

2nd when one of the users sends an input stream to the server ... is there a method so as i can obtain the IP address of this user ?


i would really appreciate your help guys !

lectricpharaoh

C#, which is quite similar to Java in many ways, supports asynchronous I/O. I'd expect Java to offer similar functionality. Basically, the way it works is you call a method to begin an operation, and supply this method with a reference to (ie, the address of) a 'callback method'. This callback method is invoked when the operation is complete, and you can do whatever you like, such as raising events or what have you.

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DaWei

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Harakim

First, this part:
The operating system takes care of this. It will create seperate buffers for

For the rest, you have two choices:
1) Use blocking code and threads
2) Use Java's Non-blocking Facilities

Either way, you are going to end up with a seperate Socket (or SocketChannel) for each user that connects to the server. This abstracts the fact that you might have several connections.

ex.
ServerSocket.accept() returns a Socket,
ServerSocketChannel.accept() returns a SocketChannel

You can pass those to a thread that handles the connection, or if you are using non-blocking I/O, you can read from the socket and go on if not enough data was sent.

For sockets, use:
String address = ((InetSocketAddress)socket.getRemoteSocketAddress()).getHostName();

For socket channels, use:
String address = ((InetSocketAddress)socketChannel.socket().getRemoteSocketAddress()).getHostName();