# Package org.apache.cayenne.access

Contains classes that make up Cayenne ORM stack.

See: Description

- Interface Summary
  Interface | Description
  --- | ---
  DataContextDelegate | Defines API for a DataContext "delegate" - an object that is temporarily passed control by DataContext at some critical points in the normal flow of execution.
  DataPortDelegate | Interface for callback and delegate methods allowing implementing classes to control various aspects of data porting via DataPort.
  DbLoaderDelegate | DbLoaderDelegate defines API that allows to control the behavior of DbLoader during the database reverse-engineering.
  ObjectMapRetainStrategy | A strategy for retaining objects in `ObjectStore`.
  OperationHints | Defines API that allows QueryEngine to obtain information about query execution strategy.
  OperationObserver | Defines a set of callback methods that allow `QueryEngine` to pass back query results and notify caller about exceptions.
  QueryEngine | Defines methods used to run Cayenne queries.
  ResultIterator | Defines API of an iterator over the records returned as a result of SelectQuery execution.
  TransactionDelegate | Defines callback methods for tracking and customizing Transactions execution.

- Class Summary
  Class | Description
  --- | ---
  ClientServerChannel | A DataChannel that provides a server-side end of the bridge between client and server objects in a Remote Object Persistence stack.
  DataContext | The most common implementation of `ObjectContext`.
  DataDomain | DataDomain performs query routing functions in Cayenne.
  DataNode | An abstraction of a single physical data storage.
  DataPort | An engine to port data between two DataNodes.
  DataRowStore | A fixed size cache of DataRows keyed by ObjectId.
  DbGenerator | Utility class that generates database schema based on Cayenne mapping.
  DbLoader | Utility class that does reverse engineering of the database.
  DefaultObjectMapRetainStrategy | Default implementation of `ObjectMapRetainStrategy`.
  IncrementalFaultList<E> | A synchronized list that serves as a container of DataObjects.
  NoSyncObjectStore | An `ObjectStore` which doesn't receive notifications on parent's `DataRowStore` events.
  ObjectStore | ObjectStore stores objects using their ObjectId as a key.
  QueryLogger | Deprecated since 3.1 replaced by injectable `JdbcEventLogger`.
  QueryResult | QueryResult encapsulates a result of execution of zero or more queries using QueryEngine.
  ToManyList | A list that holds objects for to-many relationships.
  ToManyListFault |
  ToManyMapFault |
  ToManySetFault |
  ToOneFault |
  Transaction | A Cayenne transaction.

- Exception Summary
  Exception | Description
  --- | ---
  DomainStoppedException | An exception thrown on attempts to access a DataDomain after it was explicitly shut down by the user.
  OptimisticLockException | An exception thrown on optimistic lock failure.

## Package org.apache.cayenne.access Description

Contains classes that make up Cayenne ORM stack. Three main classes from top to bottom are DataContext, DataDomain and DataNode.

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