org.jgroups.stack

Class AckReceiverWindow


public class AckReceiverWindow
extends java.lang.Object

Counterpart of AckSenderWindow. Simple FIFO buffer. Every message received is ACK'ed (even duplicates) and added to a hashmap keyed by seqno. The next seqno to be received is stored in next_to_remove. When a message with a seqno less than next_to_remove is received, it will be discarded. The remove() method removes and returns a message whose seqno is equal to next_to_remove, or null if not found.
Change May 28 2002 (bela): replaced TreeSet with HashMap. Keys do not need to be sorted, and adding a key to a sorted set incurs overhead.
Author:
Bela Ban

Constructor Summary

AckReceiverWindow(long initial_seqno)

Method Summary

void
add(long seqno, Message msg)
Adds a new message.
String
printDetails()
Message
remove()
Removes a message whose seqno is equal to next_to_remove, increments the latter.
void
reset()
int
size()
String
toString()

Constructor Details

AckReceiverWindow

public AckReceiverWindow(long initial_seqno)

Method Details

add

public void add(long seqno,
                Message msg)
Adds a new message. Message cannot be null

printDetails

public String printDetails()

remove

public Message remove()
Removes a message whose seqno is equal to next_to_remove, increments the latter. Returns message that was removed, or null, if no message can be removed. Messages are thus removed in order.

reset

public void reset()

size

public int size()

toString

public String toString()

Copyright B) 1998-2005 Bela Ban. All Rights Reserved.