org.apache.flink.table.catalog

Interface CatalogStore

All Known Implementing Classes:

AbstractCatalogStore, FileCatalogStore, GenericInMemoryCatalogStore

@PublicEvolving
public interface CatalogStore

Represents the storage where persists all Catalogs.

All catalogs can be lazy initialized with the CatalogStore.

It can be used in CatalogManager to retrieve, save and remove catalog in CatalogDescriptor format at the external storage system.

Method Summary

Modifier and Type	Method and Description
void	close() Close the catalog store when it is no longer needed and release any resource that it might be holding.
boolean	contains(String catalogName) Return whether the catalog exists in the catalog store.
Optional<CatalogDescriptor>	getCatalog(String catalogName) Get a catalog by name.
Set<String>	listCatalogs() Retrieves the names of all registered catalogs.
void	open() Open the catalog store.
void	removeCatalog(String catalogName, boolean ignoreIfNotExists) Remove a catalog with the given catalog name.
void	storeCatalog(String catalogName, CatalogDescriptor catalog) Stores a catalog under the given catalog name.

Method Detail

storeCatalog

void storeCatalog(String catalogName,
                  CatalogDescriptor catalog)
           throws CatalogException

Stores a catalog under the given catalog name. The catalog name must be unique.

Parameters:

catalogName - the given catalog name under which to store the given catalog

catalog - catalog descriptor to store

Throws:

CatalogException - throw when registration failed

removeCatalog

void removeCatalog(String catalogName,
                   boolean ignoreIfNotExists)
            throws CatalogException

Remove a catalog with the given catalog name.

Parameters:

catalogName - the given catalog name under which to remove the given catalog

ignoreIfNotExists - whether throw an exception when the catalog does not exist

Throws:

CatalogException - throw when the removal operation failed

getCatalog

Optional<CatalogDescriptor> getCatalog(String catalogName)
                                throws CatalogException

Get a catalog by name.

Parameters:

catalogName - name of the catalog to retrieve

Returns:

the requested catalog or empty if the catalog does not exist

Throws:

CatalogException - in case of any runtime exception

listCatalogs

Set<String> listCatalogs()
                  throws CatalogException

Retrieves the names of all registered catalogs.

Returns:

the names of registered catalogs

Throws:

CatalogException - in case of any runtime exception

contains

boolean contains(String catalogName)
          throws CatalogException

Return whether the catalog exists in the catalog store.

Parameters:

catalogName - the name of catalog

Throws:

CatalogException - in case of any runtime exception

open

void open()
   throws CatalogException

Open the catalog store. Used for any required preparation in initialization phase.

Throws:

CatalogException - in case of any runtime exception

close

void close()
    throws CatalogException

Close the catalog store when it is no longer needed and release any resource that it might be holding.

Throws:

CatalogException - in case of any runtime exception