eu.europeana.cloud.service.mcs.persistent.cassandra

Class CassandraDataSetDAO

java.lang.Object

eu.europeana.cloud.service.mcs.persistent.cassandra.CassandraDataSetDAO

@Repository
public class CassandraDataSetDAO
extends Object

Data set repository that uses Cassandra nosql database.

Field Summary

Fields

Modifier and Type	Field and Description
protected static String	CDSID_SEPARATOR

Constructor Summary

Constructors

Constructor and Description
CassandraDataSetDAO()

Method Summary

Methods

Modifier and Type	Method and Description
void	addAssignment(String providerId, String dataSetId, String recordId, String schema, String version) Adds representation to a data set.
eu.europeana.cloud.common.model.DataSet	createDataSet(String providerId, String dataSetId, String description, Date creationTime) Creates or updates data set for a provider.
void	deleteDataSet(String providerId, String dataSetId) Deletes data set with all its assignments.
eu.europeana.cloud.common.model.DataSet	getDataSet(String providerId, String dataSetId) Returns data set from specified provider with specified id.
Collection<eu.europeana.cloud.common.model.CompoundDataSetId>	getDataSetAssignments(String cloudId, String schemaId, String version) Returns data sets to which representation (in specified or latest version) is assigned to.
List<eu.europeana.cloud.common.model.DataSet>	getDataSets(String providerId, String thresholdDatasetId, int limit) Lists all data sets for a provider.
List<eu.europeana.cloud.common.model.Representation>	listDataSet(String providerId, String dataSetId, String thresholdCloudId, String thresholdSchema, int limit) Returns stubs of representations assigned to a data set.
void	removeAssignment(String providerId, String dataSetId, String recordId, String schema) Removes representation from data set (regardless representation version).

Methods inherited from class java.lang.Object

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

Field Detail

CDSID_SEPARATOR

protected static final String CDSID_SEPARATOR

See Also:

Constant Field Values

Constructor Detail

CassandraDataSetDAO

public CassandraDataSetDAO()

Method Detail

listDataSet

public List<eu.europeana.cloud.common.model.Representation> listDataSet(String providerId,
                                                               String dataSetId,
                                                               String thresholdCloudId,
                                                               String thresholdSchema,
                                                               int limit)
                                                                 throws com.datastax.driver.core.exceptions.NoHostAvailableException,
                                                                        com.datastax.driver.core.exceptions.QueryExecutionException

Returns stubs of representations assigned to a data set. Stubs contain cloud id and schema of the representation, may also contain version (if a certain version is in a data set).

Parameters:

providerId - data set owner's (provider's) id

dataSetId - data set id

thresholdCloudId - parameter used to pagination, returned representations wil have cloudId >= thresholdCloudId. Might be null.

thresholdSchema - parameter used to pagination, returned representations wil have schema >= thresholdSchema. Might be null.

limit - maximum size of returned list

Returns:

Throws:

com.datastax.driver.core.exceptions.NoHostAvailableException

com.datastax.driver.core.exceptions.QueryExecutionException

addAssignment

public void addAssignment(String providerId,
                 String dataSetId,
                 String recordId,
                 String schema,
                 String version)
                   throws com.datastax.driver.core.exceptions.NoHostAvailableException,
                          com.datastax.driver.core.exceptions.QueryExecutionException

Adds representation to a data set. Might add representation in latest persistent or specified version. Does not do any kind of parameter validation - specified data set and representation version must exist before invoking this method.

Parameters:

providerId - data set owner's (provider's) id

dataSetId - data set id

recordId - record id

schema - representation schema

version - representation version (might be null if newest version is to be assigned)

Throws:

com.datastax.driver.core.exceptions.NoHostAvailableException

com.datastax.driver.core.exceptions.QueryExecutionException

getDataSetAssignments

public Collection<eu.europeana.cloud.common.model.CompoundDataSetId> getDataSetAssignments(String cloudId,
                                                                                  String schemaId,
                                                                                  String version)
                                                                                    throws com.datastax.driver.core.exceptions.NoHostAvailableException,
                                                                                           com.datastax.driver.core.exceptions.QueryExecutionException

Returns data sets to which representation (in specified or latest version) is assigned to.

Parameters:

cloudId - record id

schemaId - representation schema

version - representation version (might be null)

Returns:

list of data set ids

Throws:

com.datastax.driver.core.exceptions.NoHostAvailableException

com.datastax.driver.core.exceptions.QueryExecutionException

getDataSet

public eu.europeana.cloud.common.model.DataSet getDataSet(String providerId,
                                                 String dataSetId)
                                                   throws com.datastax.driver.core.exceptions.NoHostAvailableException,
                                                          com.datastax.driver.core.exceptions.QueryExecutionException

Returns data set from specified provider with specified id. Throws exception when provider does not exist. Returns null if provider exists but does not have data set with specified id.

Parameters:

providerId - data set owner's (provider's) id

dataSetId - data set id

Returns:

data set

Throws:

com.datastax.driver.core.exceptions.NoHostAvailableException

com.datastax.driver.core.exceptions.QueryExecutionException

removeAssignment

public void removeAssignment(String providerId,
                    String dataSetId,
                    String recordId,
                    String schema)
                      throws com.datastax.driver.core.exceptions.NoHostAvailableException,
                             com.datastax.driver.core.exceptions.QueryExecutionException

Removes representation from data set (regardless representation version).

Parameters:

providerId - data set owner's (provider's) id

dataSetId - data set id

recordId - record's id

schema - representation's schema

Throws:

com.datastax.driver.core.exceptions.NoHostAvailableException

com.datastax.driver.core.exceptions.QueryExecutionException

createDataSet

public eu.europeana.cloud.common.model.DataSet createDataSet(String providerId,
                                                    String dataSetId,
                                                    String description,
                                                    Date creationTime)
                                                      throws com.datastax.driver.core.exceptions.NoHostAvailableException,
                                                             com.datastax.driver.core.exceptions.QueryExecutionException

Creates or updates data set for a provider.

Parameters:

providerId - data set owner's (provider's) id

dataSetId - data set id

description - description of data set.

creationTime - creation date

Returns:

created (or updated) data set.

Throws:

com.datastax.driver.core.exceptions.NoHostAvailableException

com.datastax.driver.core.exceptions.QueryExecutionException

getDataSets

public List<eu.europeana.cloud.common.model.DataSet> getDataSets(String providerId,
                                                        String thresholdDatasetId,
                                                        int limit)
                                                          throws com.datastax.driver.core.exceptions.NoHostAvailableException,
                                                                 com.datastax.driver.core.exceptions.QueryExecutionException

Lists all data sets for a provider.

Parameters:

providerId - data set owner's (provider's) id

thresholdDatasetId - parameter used to pagination, returned representations wil have dataSetId >= thresholdDatasetId. Might be null.

limit - max size of returned data set list.

Returns:

list of data sets.

Throws:

com.datastax.driver.core.exceptions.NoHostAvailableException

com.datastax.driver.core.exceptions.QueryExecutionException

deleteDataSet

public void deleteDataSet(String providerId,
                 String dataSetId)
                   throws com.datastax.driver.core.exceptions.NoHostAvailableException,
                          com.datastax.driver.core.exceptions.QueryExecutionException

Deletes data set with all its assignments.

Parameters:

providerId - data set owner's (provider's) id

dataSetId - data set id

Throws:

com.datastax.driver.core.exceptions.NoHostAvailableException

com.datastax.driver.core.exceptions.QueryExecutionException