public interface HGSystemFlags
This interface defines a set of system-level atom flags that can be specified at
atom addition time in order to control things like atom lifetime. The constants listed
here are used as bit flags and can be combined in the usual way by performing a bitwise
or operation on the constant values.
| Modifier and Type | Field and Description |
|---|---|
static byte |
DEFAULT
Represents the default set of flags pertaining to the system-level handling
of a HyperGraph atom.
|
static byte |
MANAGED
Indicates that an atom is managed.
|
static byte |
MUTABLE
Indicates that an atom's value may change during run-time operation.
|
static final byte DEFAULT
Represents the default set of flags pertaining to the system-level handling of a HyperGraph atom.
static final byte MUTABLE
Indicates that an atom's value may change during run-time operation. When an atom is marked as mutable, it will be automatically saved to storage before it is removed from the HyperGraph cache.
The default value for this system attribute is false. That is, atom run-time
instances are assumed immutable and applications need to explicitly invoke the
HyperGraph.replace method if need be.
static final byte MANAGED
Indicates that an atom is managed. Managed atom have their lifetime in HyperGraph be automatically controlled by the system. When an atom is managed, its usage is tracked by the system and the atom is removed if it is deemed unused. For the exact set of conditions that determine when an atom is unused, please consult the reference guide. Managed atoms are designed to support long term persistence of temporary data, such as intermediary query results automatically created by the system and certain application specific atoms.
The default value for this system attribute is false. That is, an atom
will by default persist in the database until explicitly removed with the
HyperGraph.remove method.
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