de.ipcon.tools.ref

Interface DependencyCalculatorI

All Known Implementing Classes:

BOCache

public interface DependencyCalculatorI

An interface for caches providing a callback to fetch missing values, and extending the change lister to additional BOs a cached value depends on.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	$0

Method Summary

Modifier and Type	Method and Description
long[]	calculateDependencies(java.lang.Object key, java.lang.Object value) This method calculates for a given object the ids of objects, which can invalidate the cached state.

Field Detail

$0

static final java.lang.String $0

See Also:

Constant Field Values

Method Detail

calculateDependencies

long[] calculateDependencies(java.lang.Object key,
                             java.lang.Object value)

This method calculates for a given object the ids of objects, which can invalidate the cached state. e.g. BO A contains the sum of BO B and BO C. Normal BOChangeEvents only allow looking for explicit changes to A. If this method is implemented and additionally returns the IDs of B and C, then the cache containing A is automatically invalidated, if either B or C changes.

Parameters:

key - The cache key of the object, does not have to be a Long, FIXME is it nullable or nonnull?

value - The currently cached value which might depend on other objects. Nullable

Returns:

an Array of longs, which are the IDs of all objects whose changes have an effect on the cached value of the provided object, nonnull. Should not contain the id of the value-object itself.