org.apache.directory.mavibot.btree

Class InMemoryTransactionManager

java.lang.Object

org.apache.directory.mavibot.btree.AbstractTransactionManager

org.apache.directory.mavibot.btree.InMemoryTransactionManager

All Implemented Interfaces:

TransactionManager

public class InMemoryTransactionManager
extends AbstractTransactionManager

An implementation of a TransactionManager for in-memory B-trees

Field Summary

Fields

Modifier and Type	Field and Description
private java.util.concurrent.locks.ReadWriteLock	btreeHeadersLock A lock to protect the BtreeHeader maps
private static java.lang.ThreadLocal<java.lang.Integer>	context A ThreadLocalStorage used to store the current transaction
private java.util.Map<java.lang.String,BTreeHeader<?,?>>	currentBTreeHeaders A Map keeping the latest revisions for each managed BTree
private java.util.Map<java.lang.String,BTreeHeader<?,?>>	newBTreeHeaders A Map storing the new revisions when some change have been made in some BTrees
private java.util.concurrent.locks.Lock	transactionLock A lock to protect the transaction handling

Constructor Summary

Constructors

Constructor and Description
InMemoryTransactionManager()

Method Summary

Modifier and Type	Method and Description
void	beginTransaction() Starts a transaction
void	commit() Commits a transaction
BTreeHeader	getBTreeHeader(java.lang.String name) Get the current BTreeHeader for a given Btree.
void	rollback() Rollback a transaction
void	updateNewBTreeHeaders(BTreeHeader btreeHeader) Updates the map of new BTreeHeaders

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

transactionLock

private java.util.concurrent.locks.Lock transactionLock

A lock to protect the transaction handling

context

private static final java.lang.ThreadLocal<java.lang.Integer> context

A ThreadLocalStorage used to store the current transaction

currentBTreeHeaders

private java.util.Map<java.lang.String,BTreeHeader<?,?>> currentBTreeHeaders

A Map keeping the latest revisions for each managed BTree

newBTreeHeaders

private java.util.Map<java.lang.String,BTreeHeader<?,?>> newBTreeHeaders

A Map storing the new revisions when some change have been made in some BTrees

btreeHeadersLock

private java.util.concurrent.locks.ReadWriteLock btreeHeadersLock

A lock to protect the BtreeHeader maps

Constructor Detail

InMemoryTransactionManager

public InMemoryTransactionManager()

Method Detail

beginTransaction

public void beginTransaction()

Starts a transaction

commit

public void commit()

Commits a transaction

rollback

public void rollback()

Rollback a transaction

getBTreeHeader

public BTreeHeader getBTreeHeader(java.lang.String name)

Get the current BTreeHeader for a given Btree. It might not exist

Parameters:

name - The Btree name we are looking the BtreeHeader for

Returns:

the current BTreeHeader

updateNewBTreeHeaders

public void updateNewBTreeHeaders(BTreeHeader btreeHeader)

Updates the map of new BTreeHeaders

Parameters:

btreeHeader - The new BtreeHeader