org.melati.poem.transaction
Class TransactionedSerial

java.lang.Object
  org.melati.poem.transaction.Transactioned
      org.melati.poem.transaction.TransactionedSerial

public class TransactionedSerial
extends Transactioned

A serial id of an object which is incremented each time that object is loaded or locked.

Field Summary

Fields inherited from class org.melati.poem.transaction.Transactioned

valid

Constructor Summary

TransactionedSerial(TransactionPool transactionPool)
Constructor.

Method Summary

long	current(Transaction transaction) Readlock and return the serial for the given Transaction.
void	increment_unlocked() Increment.
void	increment(Transaction transaction) Write lock and increment.
protected void	load(Transaction transaction) On load increment the Serial for this object.
protected boolean	upToDate(Transaction transaction) Return the inheritted validity flag.
protected void	writeDown(Transaction transaction) This implementation does nothing.

Methods inherited from class org.melati.poem.transaction.Transactioned

commit, invalidate, markValid, readLock, reset, rollback, setTransactionPool, transactionPool, unSee, writeLock

Methods inherited from class java.lang.Object

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

Constructor Detail

TransactionedSerial

public TransactionedSerial(TransactionPool transactionPool)

Constructor.

Parameters:

transactionPool - the TransactionPool this is relevant to

Method Detail

load

protected void load(Transaction transaction)

On load increment the Serial for this object. Load the transactioned object from its backing store.

Specified by:

load in class Transactioned

See Also:

Transactioned.load(org.melati.poem.transaction.Transaction)

upToDate

protected boolean upToDate(Transaction transaction)

Return the inheritted validity flag. Whether this instance is up-to-date.

This is a hook to enable subtypes to define under what circumstances an instance needs to be reloaded when it is marked as invalid, however the two known subtypes just return the inherited valid flag.

Specified by:

upToDate in class Transactioned

See Also:

Transactioned.upToDate(org.melati.poem.transaction.Transaction)

writeDown

protected void writeDown(Transaction transaction)

This implementation does nothing.

Specified by:

writeDown in class Transactioned

See Also:

Transactioned.writeDown(org.melati.poem.transaction.Transaction)

current

public long current(Transaction transaction)

Readlock and return the serial for the given Transaction.

Parameters:

transaction - the Transaction

Returns:

the serial for the given Transaction

increment

public void increment(Transaction transaction)

Write lock and increment.

Parameters:

transaction - the Transaction

increment_unlocked

public void increment_unlocked()

Increment.