Java AIO

It is an Asynchronous I/O API provided by the Java NIO package.

It does not block when performing I/O operations, allowing other tasks to be executed.

Unlike NIO, it uses the CompletionHandler interface to receive notifications when I/O operations are complete.

AIO Support #

AsynchronousChannel class
AsynchronousSocketChannel class
AsynchronousServerSocketChannel class
AsynchronousFileChannel class
callback, future support

It uses event notification system calls such as Thread pool, epoll, and kqueue.

When I/O is ready, asynchronous logic can be processed using Future or a callback.

AsynchronousSocketChannel #

An asynchronous channel for client sockets.

AsynchronousServerSocketChannel #

An asynchronous channel for server (TCP) sockets.

AsynchronousFileChannel #

An asynchronous channel for file read and write operations.

CompletionHandler #

An interface in the Java AIO API that handles the completion of asynchronous I/O operations.

By implementing this interface, you can define callback methods that are invoked when an I/O operation completes.

CompletionHandler has generic types, which are:

The result type of the I/O operation
The type of the object to be used when processing the I/O operation result

These are the two types.

By implementing this interface, you can define the completed() method, which is automatically called when an I/O operation finishes, and the failed() method, which is called when an exception occurs during an I/O operation.

This allows asynchronous I/O operations to be handled using a callback approach.