ojb.odmg.locking
Interface LockMap

All Known Implementing Classes:

InMemoryLockMapImpl, PersistentLockMapImpl

public interface LockMap

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.
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.
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.

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.

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.

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.

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.

removeWriter

public void removeWriter(LockEntry writer)

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

upgradeLock

public boolean upgradeLock(LockEntry reader)

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

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.

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.