Java Doc for InMemoryLockMapImpl.java in  » Database-ORM » db-ojb » org » apache » ojb » odmg » locking » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database ORM » db ojb » org.apache.ojb.odmg.locking 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


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

InMemoryLockMapImpl
public class InMemoryLockMapImpl implements LockMap(Code)
We use a HashMap and synchronize blocks of access for a get "check" then put operation. We cannot use the hashtable as you could check in one synchronized call then put in another while a different thread is doing the same thing.
author:
   Matthew Baird
author:
   update for use of Hashmap with synchronization.
author:
   implemented timed out lock removal algo.
author:
  
Thomas Mahler
author:
   original author.
version:
   $Id: InMemoryLockMapImpl.java,v 1.14.2.3 2005/12/21 22:29:51 tomdz Exp $




Method Summary
public  booleanaddReader(TransactionImpl tx, Object obj)
     Add a reader lock entry for transaction tx on object obj to the persistent storage.
 voidaddReaderInternal(LockEntry reader)
    
public  voidconfigure(Configuration pConfig)
    
public  CollectiongetReaders(Object obj)
     returns a collection of Reader LockEntries for object obj.
public  CollectiongetReaders(Identity oid)
    
 intgetSize()
    
public  LockEntrygetWriter(Object obj)
     returns the LockEntry for the Writer of object obj.
public  LockEntrygetWriter(Identity oid)
    
public  booleanhasReadLock(TransactionImpl tx, Object obj)
     check if there is a reader lock entry for transaction tx on object obj in the persistent storage.
 booleanhasReadLock(LockEntry entry)
    
public  voidremoveReader(TransactionImpl tx, Object obj)
     remove a reader lock entry for transaction tx on object obj from the persistent storage.
 voidremoveReaderByLock(LockEntry lock)
    
public  voidremoveWriter(LockEntry writer)
     remove a writer lock entry for transaction tx on object obj from the persistent storage.
public  booleansetWriter(TransactionImpl tx, Object obj)
     generate a writer lock entry for transaction tx on object obj and write it to the persistent storage.
 voidsetWriterByLock(LockEntry writer)
    
public  booleanupgradeLock(LockEntry reader)
     upgrade a reader lock entry for transaction tx on object obj and write it to the persistent storage.



Method Detail
addReader
public boolean addReader(TransactionImpl tx, Object obj)(Code)
Add a reader lock entry for transaction tx on object obj to the persistent storage.



addReaderInternal
void addReaderInternal(LockEntry reader)(Code)



configure
public void configure(Configuration pConfig) throws ConfigurationException(Code)



getReaders
public Collection getReaders(Object obj)(Code)
returns a collection of Reader LockEntries for object obj. If no LockEntries could be found an empty Vector is returned.



getReaders
public Collection getReaders(Identity oid)(Code)



getSize
int getSize()(Code)



getWriter
public LockEntry getWriter(Object obj)(Code)
returns the LockEntry for the Writer of object obj. If now writer exists, null is returned.



getWriter
public LockEntry getWriter(Identity oid)(Code)



hasReadLock
public boolean hasReadLock(TransactionImpl tx, Object obj)(Code)
check if there is a reader lock entry for transaction tx on object obj in the persistent storage.



hasReadLock
boolean hasReadLock(LockEntry entry)(Code)



removeReader
public void removeReader(TransactionImpl tx, Object obj)(Code)
remove a reader lock entry for transaction tx on object obj from the persistent storage.



removeReaderByLock
void removeReaderByLock(LockEntry lock)(Code)



removeWriter
public void removeWriter(LockEntry writer)(Code)
remove a writer lock entry for transaction tx on object obj from the persistent storage.



setWriter
public boolean setWriter(TransactionImpl tx, Object obj)(Code)
generate a writer lock entry for transaction tx on object obj and write it to the persistent storage.



setWriterByLock
void setWriterByLock(LockEntry writer)(Code)



upgradeLock
public boolean upgradeLock(LockEntry reader)(Code)
upgrade a reader lock entry for transaction tx on object obj and write it to the persistent storage.



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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