com.bigdata.btree

Interface IDirtyListener

public interface IDirtyListener

An interface that may be used to learn when a BTree becomes dirty.

Version:

$Id$

Author:

Bryan Thompson

Method Summary

Methods

Modifier and Type	Method and Description
void	dirtyEvent(ICheckpointProtocol btree) The btree has become dirty.

Method Detail

dirtyEvent

void dirtyEvent(ICheckpointProtocol btree)

The btree has become dirty.

Note: This event is always generated for a new btree. Once a btree is created it remains dirty until the root (and any dirty children) have been flushed to the backing store. A btree that is read from the backing store is always clean and consists of "immutable" nodes and/or leaves. A btree remains clean until there is a write on some node or leaf. That write triggers copy-on-write, which percolates from the point of the write up to the root node and results in the reference to the root node being replaced. When that happens a dirty event is generated.

Parameters:

btree - The btree.