package org.limewire.rudp.messages;
/**
* Defines an interface for a persistent connection message. A
* <code>KeepAliveMessage</code> signals that a connection is active.
*/
public interface KeepAliveMessage extends RUDPMessage {
/**
* The windowStart is equivalent to the lowest un-received sequenceNumber
* coming from the receiving end of the connection. It is saying, I have
* received everything up to one minus this. (Note: it rolls)
*/
public long getWindowStart();
/**
* Extend the windowStart of incoming messages with the full 8 bytes
* of state.
*/
public void extendWindowStart(long wStart);
/**
* The windowSpace is a measure of how much more data the receiver can
* receive within its buffer. This number will go to zero if the
* application on the receiving side is reading data slowly. If it goes
* to zero then the sender should stop sending.
*/
public int getWindowSpace();
}