Class AckSenderWindow

java.lang.Object
org.jgroups.stack.AckSenderWindow
All Implemented Interfaces:
Retransmitter.RetransmitCommand

public class AckSenderWindow extends Object implements Retransmitter.RetransmitCommand
ACK-based sliding window for a sender. Messages are added to the window keyed by seqno When an ACK is received, the corresponding message is removed. The Retransmitter continously iterates over the entries in the hashmap, retransmitting messages based on their creation time and an (increasing) timeout. When there are no more messages in the retransmission table left, the thread terminates. It will be re-activated when a new entry is added to the retransmission table.
Author:
Bela Ban
  • Constructor Details

  • Method Details

    • reset

      public void reset()
    • add

      public void add(long seqno, Message msg)
      Adds a new message to the retransmission table. If the message won't have received an ack within a certain time frame, the retransmission thread will retransmit the message to the receiver. A message will be retransmitted until an ack for it is received, or the destination member is excluded from the group
    • ack

      public void ack(long seqno)
      Removes all messages less than or equal to seqno from msgs, and cancels their retransmission.
    • getLowestMessage

      public Message getLowestMessage()
      Returns the message with the lowest seqno
    • size

      public int size()
    • toString

      public String toString()
      Overrides:
      toString in class Object
    • printDetails

      public String printDetails()
    • retransmit

      public void retransmit(long first_seqno, long last_seqno, Address sender)
      Description copied from interface: Retransmitter.RetransmitCommand
      Get the missing messages between sequence numbers first_seqno and last_seqno. This can either be done by sending a retransmit message to destination sender (nak-based scheme), or by retransmitting the missing message(s) to sender (ack-based scheme).
      Specified by:
      retransmit in interface Retransmitter.RetransmitCommand
      Parameters:
      first_seqno - The sequence number of the first missing message
      last_seqno - The sequence number of the last missing message
      sender - The destination of the member to which the retransmit request will be sent (nak-based scheme), or to which the message will be retransmitted (ack-based scheme).
    • getLowestSeqno

      public Long getLowestSeqno()
    • main

      public static void main(String[] args)