org.openspaces.persistency.cassandra

Class CassandraSpaceDataSource

java.lang.Object

com.gigaspaces.datasource.SpaceDataSource

org.openspaces.persistency.ClusterInfoAwareSpaceDataSource

org.openspaces.persistency.cassandra.CassandraSpaceDataSource

All Implemented Interfaces:

ClusterInfoAware

public class CassandraSpaceDataSource
extends ClusterInfoAwareSpaceDataSource

A Cassandra implementation of SpaceDataSource.

Since:

9.1.1

Author:

Dan Kilman

Field Summary

Fields

Modifier and Type	Field and Description
static String	CQL_VERSION

Fields inherited from class org.openspaces.persistency.ClusterInfoAwareSpaceDataSource

augmentInitialLoadEntries, clusterInfo, initialLoadQueries, initialLoadQueryScanningBasePackages

Constructor Summary

Constructors

Constructor and Description

CassandraSpaceDataSource(PropertyValueSerializer fixedPropertyValueSerializer, PropertyValueSerializer dynamicPropertyValueSerializer, org.apache.cassandra.cql.jdbc.CassandraDataSource cassandraDataSource, HectorCassandraClient hectorClient, int minimumNumberOfConnections, int maximumNumberOfConnections, int batchLimit, String[] initialLoadQueryScanningBasePackages, boolean augmentInitialLoadEntries, ClusterInfo clusterInfo)

Method Summary

Modifier and Type	Method and Description
void	close() Closes open jdbc connections and the hector client connection pool.
Object	getById(DataSourceIdQuery idQuery) This method is invoked whenever the space needs to read an entry from the data source according to its Id.
DataIterator<Object>	getDataIterator(DataSourceQuery query) This method is invoked whenever the space needs to read data which matches the provided DataSourceQuery from the space data source.
DataIterator<Object>	getDataIteratorByIds(DataSourceIdsQuery idsQuery) This method is invoked whenever the space needs to read several entries from the data source according to their ids.
protected Map<String,SpaceTypeDescriptor>	getInitialLoadEntriesMap()
DataIterator<Object>	initialDataLoad() This method is invoked after SpaceDataSource.initialMetadataLoad() and is used for pre fetching data from the data source on space initialization.
DataIterator<SpaceTypeDescriptor>	initialMetadataLoad() This method is invoked on space initialization (before SpaceDataSource.initialDataLoad() is invoked) and is used for introducing data types kept in the data source to the space.
boolean	supportsInheritance() Returns false, inheritance is not supported.

Methods inherited from class org.openspaces.persistency.ClusterInfoAwareSpaceDataSource

createInitialLoadQuery, getInitialLoadQueries, obtainInitialLoadQueries, setClusterInfo, setInitialLoadQueryScanningBasePackages

Methods inherited from class java.lang.Object

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

Field Detail

CQL_VERSION

public static final String CQL_VERSION

See Also:

Constant Field Values

Constructor Detail

CassandraSpaceDataSource

public CassandraSpaceDataSource(PropertyValueSerializer fixedPropertyValueSerializer,
                                PropertyValueSerializer dynamicPropertyValueSerializer,
                                org.apache.cassandra.cql.jdbc.CassandraDataSource cassandraDataSource,
                                HectorCassandraClient hectorClient,
                                int minimumNumberOfConnections,
                                int maximumNumberOfConnections,
                                int batchLimit,
                                String[] initialLoadQueryScanningBasePackages,
                                boolean augmentInitialLoadEntries,
                                ClusterInfo clusterInfo)

Method Detail

close

public void close()

Closes open jdbc connections and the hector client connection pool.

getDataIterator

public DataIterator<Object> getDataIterator(DataSourceQuery query)

Description copied from class: SpaceDataSource

This method is invoked whenever the space needs to read data which matches the provided DataSourceQuery from the space data source.

If this implementation doesn't supports types inheritance this method will be invoked for each type in the inheritance tree of the queried type.

The implementation's type inheritance support can be determined by overriding the SpaceDataSource.supportsInheritance() method.

Overrides:

getDataIterator in class SpaceDataSource

Parameters:

query - The DataSourceQuery to get results for.

Returns:

A DataIterator instance contains results for the provided DataSourceQuery.

getById

public Object getById(DataSourceIdQuery idQuery)

Description copied from class: SpaceDataSource

This method is invoked whenever the space needs to read an entry from the data source according to its Id.

The returned value can be either a POJO or a SpaceDocument instance.

The default implementation of this method is delegated to the SpaceDataSource.getDataIterator(DataSourceQuery) method so if the data source does not have an optimized way of reading an entity by its Id - the default implementation may suffice.

Overrides:

getById in class SpaceDataSource

Parameters:

idQuery - The DataSourceIdQuery to get a result for.

Returns:

A result from the SpaceDataSource which matches the provided DataSourceIdQuery.

getDataIteratorByIds

public DataIterator<Object> getDataIteratorByIds(DataSourceIdsQuery idsQuery)

Description copied from class: SpaceDataSource

This method is invoked whenever the space needs to read several entries from the data source according to their ids.

The returned values can be either POJOs or SpaceDocument instances.

The default implementation of this method is delegated to the SpaceDataSource.getById(DataSourceIdQuery) method for each id, so if the data source does not have an optimized way of reading an serveral entities by their ids - the default implementation may suffice.

Overrides:

getDataIteratorByIds in class SpaceDataSource

Parameters:

idsQuery - The DataSourceIdsQuery to get a result for.

Returns:

A DataIterator instance contains results for the provided DataSourceIdsQuery.

initialMetadataLoad

public DataIterator<SpaceTypeDescriptor> initialMetadataLoad()

Description copied from class: SpaceDataSource

This method is invoked on space initialization (before SpaceDataSource.initialDataLoad() is invoked) and is used for introducing data types kept in the data source to the space.

Please note that derived types should be returned after their super types from the iterator.

It is possible to create a SpaceTypeDescriptor using SpaceTypeDescriptorBuilder.

Overrides:

initialMetadataLoad in class ClusterInfoAwareSpaceDataSource

Returns:

A DataIterator instance which contains all SpaceTypeDescriptor instances to be introduced to the Space upon its initialization - null is treated as an empty iterator.

initialDataLoad

public DataIterator<Object> initialDataLoad()

Description copied from class: SpaceDataSource

This method is invoked after SpaceDataSource.initialMetadataLoad() and is used for pre fetching data from the data source on space initialization.

The returned DataIterator instance should contain POJOs or SpaceDocuments which their type was previously introduced to the space on SpaceDataSource.initialMetadataLoad() invocation.

Overrides:

initialDataLoad in class SpaceDataSource

Returns:

A DataIterator instance which contains all data to be written to Space upon its initialization - null is treated as an empty iterator.

supportsInheritance

public boolean supportsInheritance()

Returns false, inheritance is not supported.

Overrides:

supportsInheritance in class SpaceDataSource

Returns:

false.

getInitialLoadEntriesMap

protected Map<String,SpaceTypeDescriptor> getInitialLoadEntriesMap()