ai.grakn.kb.internal.cache

Class GlobalCache

java.lang.Object

ai.grakn.kb.internal.cache.GlobalCache

public class GlobalCache
extends Object

Tracks Knowledge Base Specific Variables

Caches Knowledge Base or Session specific data which is shared across transactions:

1. Schema Cache - All the types which make up the schema. This cache expires
2. Label Cache - All the labels which make up the schema. This can never expire and is needed in order to perform fast lookups. Essentially it is used for mapping labels to ids.

Author:

fppt

Constructor Summary

Constructors

Constructor and Description
GlobalCache(Properties properties)

Method Summary

Modifier and Type	Method and Description
void	cacheLabel(Label label, LabelId id) Caches a label so we can map type labels to type ids.
void	cacheType(Label label, SchemaConcept type) Caches a type so that we can retrieve ontological concepts without making a DB read.
Map<Label,SchemaConcept>	getCachedTypes() A copy of the cached schema.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

GlobalCache

public GlobalCache(Properties properties)

Method Detail

cacheType

public void cacheType(Label label,
                      SchemaConcept type)

Caches a type so that we can retrieve ontological concepts without making a DB read.

Parameters:

label - The label of the type to cache

type - The type to cache

cacheLabel

public void cacheLabel(Label label,
                       LabelId id)

Caches a label so we can map type labels to type ids. This is necesssary so we can make fast indexed lookups.

Parameters:

label - The label of the type to cache

id - The id of the type to cache

getCachedTypes

public Map<Label,SchemaConcept> getCachedTypes()

A copy of the cached schema. This is used when creating a new transaction.

Returns:

an immutable copy of the cached schema.