org.datanucleus.store.cassandra

Class CassandraPersistenceHandler

java.lang.Object

org.datanucleus.store.AbstractPersistenceHandler

org.datanucleus.store.cassandra.CassandraPersistenceHandler

All Implemented Interfaces:

org.datanucleus.store.StorePersistenceHandler

public class CassandraPersistenceHandler
extends org.datanucleus.store.AbstractPersistenceHandler

Handler for basic persistence operations with Cassandra datastores.

Nested Class Summary

Nested classes/interfaces inherited from interface org.datanucleus.store.StorePersistenceHandler

org.datanucleus.store.StorePersistenceHandler.PersistenceBatchType

Field Summary

Fields

Modifier and Type	Field and Description
protected Map<String,String>	deleteStatementByClassName
protected Map<String,String>	getVersionStatementByClassName
protected Map<String,String>	insertStatementByClassName
protected Map<String,String>	locateStatementByClassName

Fields inherited from class org.datanucleus.store.AbstractPersistenceHandler

storeMgr

Constructor Summary

Constructors

Constructor and Description
CassandraPersistenceHandler(org.datanucleus.store.StoreManager storeMgr)

Method Summary

Modifier and Type	Method and Description
void	close()
void	deleteObject(org.datanucleus.state.ObjectProvider op)
void	deleteObjects(org.datanucleus.state.ObjectProvider... ops)
void	fetchObject(org.datanucleus.state.ObjectProvider op, int[] fieldNumbers)
Object	findObject(org.datanucleus.ExecutionContext ec, Object id)
protected void	getColumnNamesForEmbeddedMember(org.datanucleus.store.schema.table.Table table, List<org.datanucleus.metadata.AbstractMemberMetaData> mmds, List<String> colNames, org.datanucleus.ExecutionContext ec) Convenience method to populate the "colNames" argument list with column names for the specified embedded field.
protected String	getInsertStatementForClass(org.datanucleus.metadata.AbstractClassMetaData cmd, org.datanucleus.store.schema.table.Table table, Map<String,Object> colValuesByName, org.datanucleus.ExecutionContext ec) Method to create the INSERT statement for an object of the specified class.
protected Object[]	getPkValuesForStatement(org.datanucleus.state.ObjectProvider op, org.datanucleus.store.schema.table.Table table, org.datanucleus.ClassLoaderResolver clr) Convenience method to extract the pk values to input into an LOCATE/UPDATE/DELETE/FETCH statement
protected List<org.datanucleus.store.schema.table.Column>	getPrimaryKeyColumns(org.datanucleus.metadata.AbstractClassMetaData cmd, org.datanucleus.store.schema.table.Table table, org.datanucleus.ClassLoaderResolver clr)
protected String	getVersionStatement(org.datanucleus.metadata.AbstractClassMetaData cmd, org.datanucleus.store.schema.table.Table table, org.datanucleus.ClassLoaderResolver clr)
void	insertObject(org.datanucleus.state.ObjectProvider op)
void	insertObjects(org.datanucleus.state.ObjectProvider... ops)
void	locateObject(org.datanucleus.state.ObjectProvider op)
void	locateObjects(org.datanucleus.state.ObjectProvider[] ops)
protected void	performOptimisticCheck(org.datanucleus.state.ObjectProvider op, com.datastax.driver.core.Session session, org.datanucleus.store.schema.table.Table table, org.datanucleus.metadata.VersionMetaData vermd, Object currentVersion)
void	updateObject(org.datanucleus.state.ObjectProvider op, int[] fieldNumbers)

Methods inherited from class org.datanucleus.store.AbstractPersistenceHandler

assertReadOnlyForUpdateOfObject, findObjectForUnique

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.datanucleus.store.StorePersistenceHandler

batchEnd, batchStart, fetchObjects, findObjects

Field Detail

insertStatementByClassName

protected Map<String,String> insertStatementByClassName

deleteStatementByClassName

protected Map<String,String> deleteStatementByClassName

locateStatementByClassName

protected Map<String,String> locateStatementByClassName

getVersionStatementByClassName

protected Map<String,String> getVersionStatementByClassName

Constructor Detail

CassandraPersistenceHandler

public CassandraPersistenceHandler(org.datanucleus.store.StoreManager storeMgr)

Method Detail

close

public void close()

insertObject

public void insertObject(org.datanucleus.state.ObjectProvider op)

getInsertStatementForClass

protected String getInsertStatementForClass(org.datanucleus.metadata.AbstractClassMetaData cmd,
                                            org.datanucleus.store.schema.table.Table table,
                                            Map<String,Object> colValuesByName,
                                            org.datanucleus.ExecutionContext ec)

Method to create the INSERT statement for an object of the specified class. Will add all columns for the class and all superclasses, plus any surrogate datastore-id, version, discriminator. Will have the form

 INSERT INTO {schema}.{table} (COL1,COL2,...) VALUES(?,?,...)
 

All columns are included and if the field is null then at insert CQL will delete the associated cell for the null column.

Parameters:

cmd - Metadata for the class

table - Table used for persistence

colValuesByName - Map of column values keyed by the column name

ec - ExecutionContext

Returns:

The INSERT statement

insertObjects

public void insertObjects(org.datanucleus.state.ObjectProvider... ops)

updateObject

public void updateObject(org.datanucleus.state.ObjectProvider op,
                         int[] fieldNumbers)

deleteObject

public void deleteObject(org.datanucleus.state.ObjectProvider op)

deleteObjects

public void deleteObjects(org.datanucleus.state.ObjectProvider... ops)

fetchObject

public void fetchObject(org.datanucleus.state.ObjectProvider op,
                        int[] fieldNumbers)

getColumnNamesForEmbeddedMember

protected void getColumnNamesForEmbeddedMember(org.datanucleus.store.schema.table.Table table,
                                               List<org.datanucleus.metadata.AbstractMemberMetaData> mmds,
                                               List<String> colNames,
                                               org.datanucleus.ExecutionContext ec)

Convenience method to populate the "colNames" argument list with column names for the specified embedded field.

Parameters:

table - Table that we are using

mmds - Metadata defining the embedded field (possibly nested, maybe multiple levels).

colNames - List that will have column names added to it

ec - ExecutionContext

locateObject

public void locateObject(org.datanucleus.state.ObjectProvider op)

locateObjects

public void locateObjects(org.datanucleus.state.ObjectProvider[] ops)

findObject

public Object findObject(org.datanucleus.ExecutionContext ec,
                         Object id)

getVersionStatement

protected String getVersionStatement(org.datanucleus.metadata.AbstractClassMetaData cmd,
                                     org.datanucleus.store.schema.table.Table table,
                                     org.datanucleus.ClassLoaderResolver clr)

getPkValuesForStatement

protected Object[] getPkValuesForStatement(org.datanucleus.state.ObjectProvider op,
                                           org.datanucleus.store.schema.table.Table table,
                                           org.datanucleus.ClassLoaderResolver clr)

Convenience method to extract the pk values to input into an LOCATE/UPDATE/DELETE/FETCH statement

Parameters:

op - ObjectProvider we are interested in

table - The table

clr - ClassLoader resolver

Returns:

The pk values

getPrimaryKeyColumns

protected List<org.datanucleus.store.schema.table.Column> getPrimaryKeyColumns(org.datanucleus.metadata.AbstractClassMetaData cmd,
                                                                               org.datanucleus.store.schema.table.Table table,
                                                                               org.datanucleus.ClassLoaderResolver clr)

performOptimisticCheck

protected void performOptimisticCheck(org.datanucleus.state.ObjectProvider op,
                                      com.datastax.driver.core.Session session,
                                      org.datanucleus.store.schema.table.Table table,
                                      org.datanucleus.metadata.VersionMetaData vermd,
                                      Object currentVersion)