/**
* Receives a datagram packet from this socket. When this method returns, the
* <tt>DatagramPacket</tt>'s buffer is filled with the data received. The datagram packet also
* contains the sender's IP address, and the port number on the sender's machine.
*
* <p>This method blocks until a datagram is received. The <tt>length</tt> field of the datagram
* packet object contains the length of the received message. If the message is longer than the
* packet's length, the message is truncated.
*
* @param p the <tt>DatagramPacket</tt> into which to place the incoming data
* @throws IOException if an I/O error occurs
* @see DatagramSocket#receive(DatagramPacket)
*/
@Override
public void receive(DatagramPacket p) throws IOException {
synchronized (inReceiveSyncRoot) {
inReceive++;
}
try {
super.receive(p);
} finally {
synchronized (inReceiveSyncRoot) {
inReceive--;
inReceiveSyncRoot.notifyAll();
}
}
}
/**
* Closes this datagram socket.
*
* <p>Any thread currently blocked in {@link #receive} upon this socket will throw a {@link
* SocketException} and this datagram socket will wait for it to return.
*
* @see DatagramSocket#close()
*/
@Override
public void close() {
super.close();
if (inReceiveSyncRoot == null) return;
synchronized (inReceiveSyncRoot) {
boolean interrupted = false;
while (inReceive > 0)
try {
inReceiveSyncRoot.wait();
} catch (InterruptedException iex) {
interrupted = true;
}
if (interrupted) Thread.currentThread().interrupt();
}
}