tppt.xopen
Class TransactionRecord

java.lang.Object
  |
  +--tppt.xopen.TransactionRecord

public class TransactionRecord

extends java.lang.Object

TransactionRecord is the data structure used to store the registered ResourceManager instances for specific Transaction Id. It then used the HashMap to map the resource manager id to the corresponding ResourceManaer.

Each global transaction can contain a number of cohorts(ResourceManager), and each cohorts should registered properly to the Transaction Manager so that TransactionManager knew which cohorts to be commit or abort when some transaction needs to global commit or abort. Therefore, in your TransactionManager class, you should use TransactionRecord to register/unregister the ResourceManager for specified transaction.

Version:

2.0

Author:

Jodie Wu

See Also:

HashMap, ResourceManager

Field Summary

private java.util.HashMap	map store the ResourceManager id as key and the instance as value
private int	tid Transaction id

Constructor Summary

TransactionRecord(int id)
Construct the TransactionRecord with the trainsaction id

Method Summary

java.util.Iterator	getAllRMs() Obtains all the Registered ResourceManager for this transaction id.
boolean	regsiterRM(ResourceManager rm) Register the ResourceManager.
boolean	unregisterRM(int rid) Unregister the ResourceManager

Methods inherited from class java.lang.Object

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

Field Detail

tid

private int tid

Transaction id

map

private java.util.HashMap map

store the ResourceManager id as key and the instance as value

Constructor Detail

TransactionRecord

public TransactionRecord(int id)

Construct the TransactionRecord with the trainsaction id

Parameters:

id - Transaction Id

Method Detail

regsiterRM

public boolean regsiterRM(ResourceManager rm)

Register the ResourceManager.

Parameters:

rm - ResourceManager to be registered

Returns:

true if register sucessfully; false if the key already exists in the map.

unregisterRM

public boolean unregisterRM(int rid)

Unregister the ResourceManager

Parameters:

rid - ResourceManager to be unregistered.

Returns:

true if unregister sucessfully; false if the key does not exists.

getAllRMs

public java.util.Iterator getAllRMs()

Obtains all the Registered ResourceManager for this transaction id.

Returns:

A Iterator object that contains all the registered ResourceManager.