Detecting When a Non-Blocking Socket Is Closed by the Remote Host
The only way to detect that the remote host has closed the connection
is to attempt to read or write from the connection. If the remote
host properly closed the connection, read() will return -1. If
the connection was not terminated normally, read() and
write() will throw an exception.
When using a selector to process events from a non-blocking
socket, the selector will try to return an OP_READ or
OP_WRITE event if the remote host has closed the socket.
try {
// Read from socket
int numBytesRead = socketChannel.read(buf);
if (numBytesRead == -1) {
// No more bytes can be read from the channel
socketChannel.close();
} else {
// Read the bytes from the buffer
}
} catch (IOException e) {
// Connection may have been closed
}
try {
// Write to socket
int numBytesWritten = socketChannel.write(buf);
} catch (IOException e) {
// Connection may have been closed
}
Post a comment