Package org.apache.cayenne.access

Interface DeferredValue

All Superinterfaces:

InternalUnsupportedTypeFactory.Marker

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface DeferredValue
extends InternalUnsupportedTypeFactory.Marker

A value that is not known until a preceding row of the same transaction has been executed, e.g. a generated PK propagated to a dependent PK or to a foreign key. Such a value is captured when a batch is planned and resolved lazily via resolve(Object) when the owning row is bound, after the rows it depends on have been executed.

Since:

5.0

Field Summary

Fields

Modifier and Type	Field	Description
static final int	MAX_NESTED_LEVEL

Method Summary

Modifier and Type	Method	Description
Object	get()	Returns the current value, which may itself be another DeferredValue.
static Object	resolve(Object value)	Fully resolves a value that may be a DeferredValue, following nested chains all the way down.

Methods inherited from interface org.apache.cayenne.access.types.InternalUnsupportedTypeFactory.Marker

errorMessage

Field Details

MAX_NESTED_LEVEL

static final int MAX_NESTED_LEVEL

See Also:

• Constant Field Values

Method Details

get

Object get()

Returns the current value, which may itself be another DeferredValue. Use resolve(Object) to collapse a full chain.

resolve

static Object resolve(Object value)

Fully resolves a value that may be a DeferredValue, following nested chains all the way down. A value that is not a DeferredValue is returned as is. Throws if the chain does not terminate, guarding against a value that (incorrectly) resolves to itself.