org.apache.ojb.otm.lock
Class ObjectLock

java.lang.Object
  org.apache.ojb.otm.lock.ObjectLock

public class ObjectLock
extends Object

Represents the locks held for an object. The basic assertion is that at any given point in time, there can be multiple readers, but just one writer.

Author:

Raghu Rajah

Nested Class Summary

private class

ObjectLock.LockEntry

Field Summary

private Identity	_oid
private HashMap	_readers
private ObjectLock.LockEntry	_writer

Constructor Summary

ObjectLock(Identity oid)

Method Summary

boolean	doesReaderExists()
Collection	getReaders()
Identity	getTargetIdentity()
Transaction	getWriter()
boolean	isFree()
boolean	isReader(Transaction tx)
void	readLock(Transaction tx)
void	releaseLock(Transaction tx)
void	waitForTx(Transaction tx)
void	writeLock(Transaction tx)

Methods inherited from class java.lang.Object

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

Field Detail

_oid

private Identity _oid

_writer

private ObjectLock.LockEntry _writer

_readers

private HashMap _readers

Constructor Detail

ObjectLock

public ObjectLock(Identity oid)

Method Detail

getTargetIdentity

public Identity getTargetIdentity()

getWriter

public Transaction getWriter()

isReader

public boolean isReader(Transaction tx)

doesReaderExists

public boolean doesReaderExists()

getReaders

public Collection getReaders()

readLock

public void readLock(Transaction tx)

writeLock

public void writeLock(Transaction tx)
               throws LockingException

Throws:

LockingException

releaseLock

public void releaseLock(Transaction tx)

waitForTx

public void waitForTx(Transaction tx)
               throws LockingException

Throws:

LockingException

isFree

public boolean isFree()