SyncFactory by default as the
* com.sun.rowset.providers.RIOptimisticProvider.
* As an extension of the SyncProvider abstract
* class, it provides the reader and writer classes required by disconnected
* rowsets as javax.sql.RowSetReader and javax.sql.RowSetWriter
* interface implementations. As a reference implementation,
* RIOptimisticProvider provides a
* fully functional implementation offering a medium grade classification of
* syncrhonization, namely GRADE_CHECK_MODIFIED_AT_COMMIT. A
* disconnected RowSet implementation using the
* RIOptimisticProvider can expect the writer to
* check only rows that have been modified in the RowSet against
* the values in the data source. If there is a conflict, that is, if a value
* in the data source has been changed by another party, the
* RIOptimisticProvider will not write any of the changes to the data
* source and will throw a SyncProviderException object.
*
* RowSet implementations may opt to use this
* SyncProvider implementation in one of two ways:
* setSyncProvider method
defined in the CachedRowSet interface
*
* CachedRowset crs = new FooCachedRowSetImpl();
* crs.setSyncProvider("com.sun.rowset.providers.RIOptimisticProvider");
*
* RowSet
* implementation
* * CachedRowset crs = new FooCachedRowSetImpl( * "com.sun.rowset.providers.RIOptimisticProvider"); **
RIOptimisticProvider implementation is
* the default provider, it will always be the provider when no provider ID is
* specified to the constructor.
*
* See the standard RowSet reference implementations in the
* com.sun.rowset package for more details.
*
* @author Jonathan Bruce
* @see javax.sql.rowset.spi.SyncProvider
* @see javax.sql.rowset.spi.SyncProviderException
* @see javax.sql.rowset.spi.SyncFactory
* @see javax.sql.rowset.spi.SyncFactoryException
*
*/
public final class RIOptimisticProvider extends SyncProvider implements Serializable {
private CachedRowSetReader reader;
private CachedRowSetWriter writer;
/**
* The unique provider identifier.
*/
private String providerID = "com.sun.rowset.providers.RIOptimisticProvider";
/**
* The vendor name of this SyncProvider implementation
*/
private String vendorName = "Oracle Corporation";
/**
* The version number of this SyncProvider implementation
*/
private String versionNumber = "1.0";
/**
* ResourceBundle
*/
private JdbcRowSetResourceBundle resBundle;
/**
* Creates an RIOptimisticProvider object initialized with the
* fully qualified class name of this SyncProvider implementation
* and a default reader and writer.
*
* This provider is available to all disconnected RowSet implementations
* as the default persistence provider.
*/
public RIOptimisticProvider() {
providerID = this.getClass().getName();
reader = new CachedRowSetReader();
writer = new CachedRowSetWriter();
try {
resBundle = JdbcRowSetResourceBundle.getJdbcRowSetResourceBundle();
} catch(IOException ioe) {
throw new RuntimeException(ioe);
}
}
/**
* Returns the 'javax.sql.rowset.providers.RIOptimisticProvider'
* provider identification string.
*
* @return String Provider ID of this persistence provider
*/
public String getProviderID() {
return providerID;
}
/**
* Returns the javax.sql.RowSetWriter object for this
* RIOptimisticProvider object. This is the writer that will
* write changes made to the Rowset object back to the data source.
*
* @return the javax.sql.RowSetWriter object for this
* RIOptimisticProvider object
*/
public RowSetWriter getRowSetWriter() {
try {
writer.setReader(reader);
} catch (java.sql.SQLException e) {}
return writer;
}
/**
* Returns the javax.sql.RowSetReader object for this
* RIOptimisticProvider object. This is the reader that will
* populate a RowSet object using this RIOptimisticProvider.
*
* @return the javax.sql.RowSetReader object for this
* RIOptimisticProvider object
*/
public RowSetReader getRowSetReader() {
return reader;
}
/**
* Returns the SyncProvider grade of synchronization that
* RowSet objects can expect when using this
* implementation. As an optimisic synchonization provider, the writer
* will only check rows that have been modified in the RowSet
* object.
*/
public int getProviderGrade() {
return SyncProvider.GRADE_CHECK_MODIFIED_AT_COMMIT;
}
/**
* Modifies the data source lock severity according to the standard
* SyncProvider classifications.
*
* @param datasource_lock An int indicating the level of locking to be
* set; must be one of the following constants:
*
* SyncProvider.DATASOURCE_NO_LOCK,
* SyncProvider.DATASOURCE_ROW_LOCK,
* SyncProvider.DATASOURCE_TABLE_LOCK,
* SyncProvider.DATASOURCE_DB_LOCk
*
* @throws SyncProviderException if the parameter specified is not
* SyncProvider.DATASOURCE_NO_LOCK
*/
public void setDataSourceLock(int datasource_lock) throws SyncProviderException {
if(datasource_lock != SyncProvider.DATASOURCE_NO_LOCK ) {
throw new SyncProviderException(resBundle.handleGetObject("riop.locking").toString());
}
}
/**
* Returns the active data source lock severity in this
* reference implementation of the SyncProvider
* abstract class.
*
* @return SyncProvider.DATASOURCE_NO_LOCK.
* The reference implementation does not support data source locks.
*/
public int getDataSourceLock() throws SyncProviderException {
return SyncProvider.DATASOURCE_NO_LOCK;
}
/**
* Returns the supported updatable view abilities of the
* reference implementation of the SyncProvider
* abstract class.
*
* @return SyncProvider.NONUPDATABLE_VIEW_SYNC. The
* the reference implementation does not support updating tables
* that are the source of a view.
*/
public int supportsUpdatableView() {
return SyncProvider.NONUPDATABLE_VIEW_SYNC;
}
/**
* Returns the release version ID of the Reference Implementation Optimistic
* Synchronization Provider.
*
* @return the String detailing the version number of this SyncProvider
*/
public String getVersion() {
return this.versionNumber;
}
/**
* Returns the vendor name of the Reference Implementation Optimistic
* Synchronization Provider
*
* @return the String detailing the vendor name of this
* SyncProvider
*/
public String getVendor() {
return this.vendorName;
}
private void readObject(ObjectInputStream ois) throws IOException, ClassNotFoundException {
// Default state initialization happens here
ois.defaultReadObject();
// Initialization of transient Res Bundle happens here .
try {
resBundle = JdbcRowSetResourceBundle.getJdbcRowSetResourceBundle();
} catch(IOException ioe) {
throw new RuntimeException(ioe);
}
}
static final long serialVersionUID =-3143367176751761936L;
}