com.haulmont.cuba.core.app

Interface DataStore

All Known Implementing Classes:

RdbmsStore

public interface DataStore

Interface defining methods for storing and loading entities in a persistent storage.

Implementations of this interface are used by DataManager, do not invoke them from your application code.

Method Summary

Modifier and Type	Method and Description
java.util.Set<Entity>	commit(CommitContext context) Commits a collection of new or detached entity instances to the storage.
long	getCount(LoadContext<? extends Entity> context) Returns the number of entity instances for the given query passed in the LoadContext.
<E extends Entity> E	load(LoadContext<E> context) Loads a single entity instance.
<E extends Entity> java.util.List<E>	loadList(LoadContext<E> context) Loads collection of entity instances.
java.util.List<KeyValueEntity>	loadValues(ValueLoadContext context) Loads list of key-value pairs.

Method Detail

load

@Nullable
<E extends Entity> E load(LoadContext<E> context)

Loads a single entity instance.

Returns:

the loaded object, or null if not found

loadList

<E extends Entity> java.util.List<E> loadList(LoadContext<E> context)

Loads collection of entity instances.

Returns:

a list of instances, or empty list if nothing found

getCount

long getCount(LoadContext<? extends Entity> context)

Returns the number of entity instances for the given query passed in the LoadContext.

Returns:

number of instances in the storage

commit

java.util.Set<Entity> commit(CommitContext context)

Commits a collection of new or detached entity instances to the storage.

Returns:

set of committed instances

loadValues

java.util.List<KeyValueEntity> loadValues(ValueLoadContext context)

Loads list of key-value pairs.

Parameters:

context - defines a query for scalar values and a list of keys for returned KeyValueEntity

Returns:

list of KeyValueEntity instances