Package org.apache.jena.dboe.transaction

Class TransInteger

java.lang.Object

org.apache.jena.dboe.transaction.txn.TransactionalComponentLifecycle<org.apache.jena.dboe.transaction.TransInteger.IntegerState>

org.apache.jena.dboe.transaction.TransInteger

All Implemented Interfaces:

TransactionalComponent

public class TransInteger
extends TransactionalComponentLifecycle<org.apache.jena.dboe.transaction.TransInteger.IntegerState>

A transaction component with an integer supporting MR+SW (=one writer AND many readers).

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.jena.dboe.transaction.txn.TransactionalComponentLifecycle

TransactionalComponentLifecycle.ComponentState<X>

Constructor Summary

Constructors

Constructor	Description
TransInteger()	In-memory, non persistent, transactional integer
TransInteger(long v)	In-memory, non persistent, transactional integer
TransInteger(long v, ComponentId componentId)	In-memory, non persistent, transactional integer
TransInteger(java.lang.String filename, ComponentId cid)	Persistent, transactional integer.

Method Summary

Modifier and Type	Method	Description
void	cleanStart()	Indicate that no recovery is being done (the journal thinks everything was completed last time)
void	finishRecovery()	End of the recovery phase
long	get()	Return the current value.
void	inc()	Set the value, return the old value
long	read()	Return the current value in a transaction.
void	recover(java.nio.ByteBuffer ref)	Notification that ref was really committed and is being recovered.
long	set(long x)	Set the value, return the old value
void	startRecovery()
java.lang.String	toString()
long	value()	Read the current global state (that is, the last committed value) outside a transaction.

Methods inherited from class org.apache.jena.dboe.transaction.txn.TransactionalComponentLifecycle

abort, attach, begin, commit, commitEnd, commitPrepare, complete, detach, getComponentId, getComponentState, promote, setComponentState, shutdown

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

TransInteger

public TransInteger()

In-memory, non persistent, transactional integer

TransInteger

public TransInteger(long v)

In-memory, non persistent, transactional integer

TransInteger

public TransInteger(long v,
                    ComponentId componentId)

In-memory, non persistent, transactional integer

TransInteger

public TransInteger(java.lang.String filename,
                    ComponentId cid)

Persistent, transactional integer. The persistent state is held in filename. When first initialized, the value is 0L.

Parameters:

filename - Persistent state

cid - Component id

Method Detail

startRecovery

public void startRecovery()

Specified by:

startRecovery in interface TransactionalComponent

Specified by:

startRecovery in class TransactionalComponentLifecycle<org.apache.jena.dboe.transaction.TransInteger.IntegerState>

recover

public void recover(java.nio.ByteBuffer ref)

Description copied from interface: TransactionalComponent

Notification that ref was really committed and is being recovered.

Specified by:

recover in interface TransactionalComponent

Specified by:

recover in class TransactionalComponentLifecycle<org.apache.jena.dboe.transaction.TransInteger.IntegerState>

Parameters:

ref - Same bytes as were written during prepare originally.

finishRecovery

public void finishRecovery()

Description copied from interface: TransactionalComponent

End of the recovery phase

Specified by:

finishRecovery in interface TransactionalComponent

Specified by:

finishRecovery in class TransactionalComponentLifecycle<org.apache.jena.dboe.transaction.TransInteger.IntegerState>

cleanStart

public void cleanStart()

Description copied from interface: TransactionalComponent

Indicate that no recovery is being done (the journal thinks everything was completed last time)

inc

public void inc()

Set the value, return the old value

set

public long set(long x)

Set the value, return the old value

read

public long read()

Return the current value in a transaction. s

get

public long get()

Return the current value. If inside a transaction, return the transaction view of the value. If not in a transaction return the state value (effectively a read transaction, optimized by the fact that reading the TransInteger state is atomic).

value

public long value()

Read the current global state (that is, the last committed value) outside a transaction.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object