com.sap.cds.mt

Class CdsDataStoreLookup

java.lang.Object

com.sap.cds.mt.CdsDataStoreLookup

public class CdsDataStoreLookup
extends Object

Responsible for retrieval of CdsDataStoreConnectors. For performance reasons CdsDataStore connector instances are cached per tenant. The cache is synchronized with the MetaDataAccessor's cache: cache CdsDataStore entries are automatically refreshed when a cached model changes in the MetaDataAccessor's cache. To manually refresh a CdsDataStore for a particular tenant the tenant's model must be refreshed or evicted at the MetaDataAccessor.

See Also:

MetaDataAccessor.refresh(String), MetaDataAccessor.evict(String)

Constructor Summary

Constructors

Constructor and Description
CdsDataStoreLookup(CdsDataStoreConnectorCreator cdsDataStoreConnectorCreator, BiPredicate<String,CdsModel> isModelOutDated, CacheParams cacheParams, com.google.common.base.Ticker cacheTicker)

Method Summary

Modifier and Type	Method and Description
void	evictIfOutDated(String tenantId)
CdsDataStoreConnector	getCdsDataStoreConnector(String tenantId) Determine a data store connector for a tenant

Methods inherited from class java.lang.Object

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

Constructor Detail

CdsDataStoreLookup

public CdsDataStoreLookup(CdsDataStoreConnectorCreator cdsDataStoreConnectorCreator,
                          BiPredicate<String,CdsModel> isModelOutDated,
                          CacheParams cacheParams,
                          com.google.common.base.Ticker cacheTicker)

Parameters:

cdsDataStoreConnectorCreator - factory that creates a CdsDataStoreConnector

isModelOutDated - predicate that takes the tenant id and the current model as input and decides if the model is out dated

cacheParams - Parameters that control cache lifecycle

cacheTicker - Optional ticker used by guava cache for testing purposes, use null for productive use

Method Detail

getCdsDataStoreConnector

public CdsDataStoreConnector getCdsDataStoreConnector(String tenantId)
                                               throws CdsException

Determine a data store connector for a tenant

Parameters:

tenantId - tenant identifier

Returns:

a CDS data store connector

Throws:

CdsException

evictIfOutDated

public void evictIfOutDated(String tenantId)