org.apache.ojb.odmg.locking
Class RemoteLockMapImpl

java.lang.Object
  org.apache.ojb.odmg.locking.RemoteLockMapImpl

All Implemented Interfaces:

Configurable, LockMap

public class RemoteLockMapImpl

extends java.lang.Object

implements LockMap, Configurable

Servlet based lock mechanism for usage in distributed environment.

Version:

$Id: RemoteLockMapImpl.java,v 1.1 2004/01/17 16:57:34 thma Exp $

Author:

Thomas Mahler

Constructor Summary

RemoteLockMapImpl()

Method Summary

boolean	addReader(TransactionImpl tx, java.lang.Object obj) Add a reader lock entry for transaction tx on object obj to the persistent storage.
void	configure(Configuration pConfig) configure an object using the Configuration pConfig
java.util.Collection	getReaders(java.lang.Object obj) returns a collection of Reader LockEntries for object obj.
LockEntry	getWriter(java.lang.Object obj) returns the LockEntry for the Writer of object obj.
boolean	hasReadLock(TransactionImpl tx, java.lang.Object obj) check if there is a reader lock entry for transaction tx on object obj in the persistent storage.
void	removeReader(TransactionImpl tx, java.lang.Object obj) remove a reader lock entry for transaction tx on object obj from the persistent storage.
void	removeWriter(LockEntry writer) remove a writer lock entry for transaction tx on object obj from the persistent storage.
byte[]	serialize(java.lang.Object obj)
boolean	setWriter(TransactionImpl tx, java.lang.Object obj) generate a writer lock entry for transaction tx on object obj and write it to the persistent storage.
boolean	upgradeLock(LockEntry reader) upgrade a reader lock entry for transaction tx on object obj and write it to the persistent storage.

Methods inherited from class java.lang.Object

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

Constructor Detail

RemoteLockMapImpl

public RemoteLockMapImpl()

Method Detail

getWriter

public LockEntry getWriter(java.lang.Object obj)

returns the LockEntry for the Writer of object obj. If now writer exists, null is returned.

Specified by:

getWriter in interface LockMap

getReaders

public java.util.Collection getReaders(java.lang.Object obj)

returns a collection of Reader LockEntries for object obj. If now LockEntries could be found an empty Vector is returned.

Specified by:

getReaders in interface LockMap

addReader

public boolean addReader(TransactionImpl tx,
                         java.lang.Object obj)

Add a reader lock entry for transaction tx on object obj to the persistent storage.

Specified by:

addReader in interface LockMap

serialize

public byte[] serialize(java.lang.Object obj)
                 throws java.io.IOException

Throws:

java.io.IOException

removeReader

public void removeReader(TransactionImpl tx,
                         java.lang.Object obj)

remove a reader lock entry for transaction tx on object obj from the persistent storage.

Specified by:

removeReader in interface LockMap

removeWriter

public void removeWriter(LockEntry writer)

remove a writer lock entry for transaction tx on object obj from the persistent storage.

Specified by:

removeWriter in interface LockMap

upgradeLock

public boolean upgradeLock(LockEntry reader)

upgrade a reader lock entry for transaction tx on object obj and write it to the persistent storage.

Specified by:

upgradeLock in interface LockMap

setWriter

public boolean setWriter(TransactionImpl tx,
                         java.lang.Object obj)

generate a writer lock entry for transaction tx on object obj and write it to the persistent storage.

Specified by:

setWriter in interface LockMap

hasReadLock

public boolean hasReadLock(TransactionImpl tx,
                           java.lang.Object obj)

check if there is a reader lock entry for transaction tx on object obj in the persistent storage.

Specified by:

hasReadLock in interface LockMap

configure

public void configure(Configuration pConfig)
               throws ConfigurationException

Description copied from interface: Configurable

configure an object using the Configuration pConfig

Specified by:

configure in interface Configurable

Parameters:

pConfig - the Configuration object used to configure current instance

Throws:

ConfigurationException

See Also:

Configurable.configure(org.apache.ojb.broker.util.configuration.Configuration)