org.eiichiro.acidhouse

Class Log

java.lang.Object

org.eiichiro.acidhouse.Log

public class Log
extends Object

Log is a built-in object that represents the datastore operation and the operation's state. This object is used as a write-ahead-log in distributed transaction commitment and also used for the state dump when a transaction is failed.

Author:

Eiichiro Uchiumi

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Log.Operation Operation is the type of datastore operation.
static class	Log.State State is the state of datastore operation.

Constructor Summary

Constructors

Constructor and Description
Log(long sequence, Log.Operation operation, Object entity) Constructs a new Log instance with the specified operation sequence in session, operation type and the entity which this operation is applied to.

Method Summary

Methods

Modifier and Type	Method and Description
Object	entity() Returns the entity which this operation is applied to.
Log.Operation	operation() Returns the operation type.
long	sequence() Returns the operation sequence in session.
Log.State	state() Returns the state of datastore operation.
void	state(Log.State state) Sets the specified state into this log.

Methods inherited from class java.lang.Object

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

Constructor Detail

Log

public Log(long sequence,
   Log.Operation operation,
   Object entity)

Constructs a new Log instance with the specified operation sequence in session, operation type and the entity which this operation is applied to.

Parameters:

sequence - The operation sequence in one Session.

operation - The operation.

entity - The entity which this operation is applied to.

Method Detail

sequence

public long sequence()

Returns the operation sequence in session.

Returns:

The operation sequence in session.

operation

public Log.Operation operation()

Returns the operation type.

Returns:

The operation type.

entity

public Object entity()

Returns the entity which this operation is applied to.

Returns:

The entity which this operation is applied to.

state

public void state(Log.State state)

Sets the specified state into this log.

Parameters:

state - The state of datastore operation.

state

public Log.State state()

Returns the state of datastore operation.

Returns:

The state of datastore operation.