Class AckReceiverWindow

java.lang.Object
org.jgroups.stack.AckReceiverWindow

public class AckReceiverWindow extends 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.
Version:
$Id: AckReceiverWindow.java,v 1.25.2.4.2.2 2009/04/28 11:31:50 belaban Exp $
Author:
Bela Ban
  • Constructor Details

    • AckReceiverWindow

      public AckReceiverWindow(long initial_seqno)
  • Method Details

    • getLock

      public ReentrantLock getLock()
    • add

      public boolean add(long seqno, Message msg)
      Adds a new message. Message cannot be null
      Returns:
      True if the message was added, false if not (e.g. duplicate, message was already present)
    • 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.
    • removeOOBMessage

      public Message removeOOBMessage()
    • hasMessagesToRemove

      public boolean hasMessagesToRemove()
    • smallerThanNextToRemove

      public boolean smallerThanNextToRemove(long seqno)
    • reset

      public void reset()
    • size

      public int size()
    • toString

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

      public String printDetails()