Java Doc for TransactionalDataProvider.java in  » IDE-Netbeans » visualweb.api.designer » com » sun » data » provider » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE Netbeans » visualweb.api.designer » com.sun.data.provider 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


com.sun.data.provider.TransactionalDataProvider

All known Subclasses:   com.sun.data.provider.impl.ObjectListDataProvider,  com.sun.data.provider.impl.CachedRowSetDataProvider,  com.sun.data.provider.impl.BasicTransactionalTableDataProvider,  com.sun.data.provider.impl.BasicTransactionalDataProvider,
TransactionalDataProvider
public interface TransactionalDataProvider extends DataProvider(Code)

Behavioral interface that is implemented by DataProvider classes that offer commit/revert support. In such environments, methods that modify the data element values (such as setValue()) must cause the new values to be cached, and the underlying data elements are not actually updated until commitChanges() is called. An application may also call revertChanges() to throw away any cached updates. In spite of this caching, however, valueChanged() events must still be sent to registered DataListener s -- an instance of TransactionalDataListener will also be notified when the actual commitChanges() or revertChanges() occurs.

During the time between when a modification method (such as setValue() is called, and a later call to commitChanges(), any calls to getType() or getValue() will reflect the modified value from the cache, not the original value from the underlying data structure.


author:
   Craig McClanahan
author:
   Joe Nuxoll




Method Summary
public  voidaddTransactionalDataListener(TransactionalDataListener listener)
    
public  voidcommitChanges()
    

Cause any cached changes to values of data elements supported by this DataProvider to be passed through to the underlying data structure.


throws:
  DataProviderException - Implementations may wish to surfaceinternal exceptions (nested in DataProviderException).
public  TransactionalDataListener[]getTransactionalDataListeners()
    
public  voidremoveTransactionalDataListener(TransactionalDataListener listener)
    
public  voidrevertChanges()
    

Cause any cached changes to values of data elements supported by this DataProvider to be thrown away, so that the initial values are again visible.


throws:
  DataProviderException - Implementations may wish to surfaceinternal exceptions (nested in DataProviderException).



Method Detail
addTransactionalDataListener
public void addTransactionalDataListener(TransactionalDataListener listener)(Code)

Register a new TransactionalDataListener to this TransactionalDataProvider instance.


Parameters:
  listener - New TransactionalDataListener to register



commitChanges
public void commitChanges() throws DataProviderException(Code)

Cause any cached changes to values of data elements supported by this DataProvider to be passed through to the underlying data structure.


throws:
  DataProviderException - Implementations may wish to surfaceinternal exceptions (nested in DataProviderException). Consultthe documentation of the specific DataProvider implementation fordetails on what exceptions might be wrapped by a DPE.



getTransactionalDataListeners
public TransactionalDataListener[] getTransactionalDataListeners()(Code)
An array of the TransactionalDataListenerscurrently registered on this TransactionalDataProvider.If there are no registered listeners, a zero-length array isreturned.



removeTransactionalDataListener
public void removeTransactionalDataListener(TransactionalDataListener listener)(Code)

Deregister an existing TransactionalDataListener from TransactionalDataProvider instance.


Parameters:
  listener - Old TransactionalDataListener to remove



revertChanges
public void revertChanges() throws DataProviderException(Code)

Cause any cached changes to values of data elements supported by this DataProvider to be thrown away, so that the initial values are again visible.


throws:
  DataProviderException - Implementations may wish to surfaceinternal exceptions (nested in DataProviderException). Consultthe documentation of the specific DataProvider implementation fordetails on what exceptions might be wrapped by a DPE.



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