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What are Async Sockets? How are they different from normal sockets (Blocking and Non-Blocking)?
Any pointers in that direction or any links to tutorials will be helpful.
Thanks.
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The send, receive, and reply operations may be synchronous or asynchronous. A synchronous operation blocks a process till the operation completes. An asynchronous operation is non-blocking and only initiates the operation. The caller could discover completion by some other mechanism discussed later.
There are two key classes associated with asynchronous socket operation. They are AsynchronousServerSocketChannel and AsynchronousSocketChannel; both are found in the package named java.
Asynchronous applications deliver continuously updated application data to users. This is achieved by separating client requests from application updates. Multiple asynchronous communications between client and server may occur simultaneously or in parallel with one another.
You can read data asynchronously with the TCP/IP object in one of these two ways: Continuously, by setting ReadAsyncMode to continuous . In this mode, data is automatically stored in the input buffer as it becomes available from the server. Manually, by setting ReadAsyncMode to manual .
There are three ways to communicate with sockets in async way:
Open regular socket, but do not read from it (because read() blocks) until you know there it something to be read. You can use select() or poll() to check whether there are data to read from socket(s), and if there is something, read it, as read() won't block.
Switch socket to non-blocking I/O, by setting O_NONBLOCK flag with fcntl() function. In this case read() won't block.
Set socket's O_ASYNC flag using FIOASYNC option of ioctl() (see man 7 socket for details). In this case you will receive SIGIO signal when there is something to read from socket.
Third approach is async socket.
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