Package com.sap.cds.services.utils.lib.mt

Class CdsDataStoreLookup

java.lang.Object

com.sap.cds.services.utils.lib.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	Description
CdsDataStoreLookup(CdsDataStoreConnectorCreator cdsDataStoreConnectorCreator, BiPredicate<String,com.sap.cds.reflect.CdsModel> isModelOutDated, CacheParams cacheParams, com.google.common.base.Ticker cacheTicker)

Method Summary

Modifier and Type	Method	Description
void	evictIfOutDated(String tenantId)
com.sap.cds.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 Details

CdsDataStoreLookup

public CdsDataStoreLookup(CdsDataStoreConnectorCreator cdsDataStoreConnectorCreator,
 BiPredicate<String,com.sap.cds.reflect.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 Details

getCdsDataStoreConnector

public com.sap.cds.CdsDataStoreConnector getCdsDataStoreConnector(String tenantId)
                                                           throws com.sap.cds.CdsException

Determine a data store connector for a tenant

Parameters:

tenantId - tenant identifier

Returns:

a CDS data store connector

Throws:

com.sap.cds.CdsException

evictIfOutDated

public void evictIfOutDated(String tenantId)