org.apache.jena.system

Class TxnCounter

java.lang.Object

org.apache.jena.system.TxnCounter

All Implemented Interfaces:

Transactional

public class TxnCounter
extends Object
implements Transactional

A MR+SW transactional Counter

Constructor Summary

Constructors

Constructor and Description
TxnCounter(long x)

Method Summary

Modifier and Type	Method and Description
void	abort() Abort a transaction - finish the transaction and undo any changes (if a "write" transaction)
void	begin(ReadWrite readWrite) Start either a READ or WRITE transaction
void	begin(ReadWrite readWrite, boolean canBlock)
void	commit() Commit a transaction - finish the transaction and make any changes permanent (if a "write" transaction)
void	dec() Decrement the value inside a write transaction
void	end() Finish the transaction - if a write transaction and commit() has not been called, then abort
long	get() Return the current value.
void	inc() Increment the value inside a write transaction
boolean	isInTransaction() Say whether inside a transaction.
long	read() Return the current value in a transaction.
long	set(long x) Set the value inside a write transaction, return the old value
long	value() Read the current global state (that is, the last committed value) outside a transaction.

Methods inherited from class java.lang.Object

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

Constructor Detail

TxnCounter

public TxnCounter(long x)

Method Detail

begin

public void begin(ReadWrite readWrite)

Description copied from interface: Transactional

Start either a READ or WRITE transaction

Specified by:

begin in interface Transactional

begin

public void begin(ReadWrite readWrite,
                  boolean canBlock)

commit

public void commit()

Description copied from interface: Transactional

Commit a transaction - finish the transaction and make any changes permanent (if a "write" transaction)

Specified by:

commit in interface Transactional

abort

public void abort()

Description copied from interface: Transactional

Abort a transaction - finish the transaction and undo any changes (if a "write" transaction)

Specified by:

abort in interface Transactional

isInTransaction

public boolean isInTransaction()

Description copied from interface: Transactional

Say whether inside a transaction.

Specified by:

isInTransaction in interface Transactional

end

public void end()

Description copied from interface: Transactional

Finish the transaction - if a write transaction and commit() has not been called, then abort

Specified by:

end in interface Transactional

inc

public void inc()

Increment the value inside a write transaction

dec

public void dec()

Decrement the value inside a write transaction

set

public long set(long x)

Set the value inside a write transaction, return the old value

read

public long read()

Return the current value in a transaction. Must be inside a transaction.

See Also:

get()

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.