org.neo4j.kernel.api.operations

Interface SchemaStateOperations

All Known Subinterfaces:

SchemaOperations, StatementOperations

public interface SchemaStateOperations

Method Summary

Methods

Modifier and Type	Method and Description
<K> boolean	schemaStateContains(Statement state, K key) Check if some key is in the schema state.
<K,V> V	schemaStateGetOrCreate(Statement state, K key, Function<K,V> creator) The schema state is flushed when ever the schema is updated.

Method Detail

schemaStateGetOrCreate

<K,V> V schemaStateGetOrCreate(Statement state,
                             K key,
                             Function<K,V> creator)

The schema state is flushed when ever the schema is updated. If you build objects the rely on the current state of the schema, use this to make sure you don't use outdated schema information. Additionally, schema state entries are evicted using an LRU policy. The size of the LRU cache is determined by GraphDatabaseSettings.query_cache_size NOTE: This currently is solely used by Cypher and might or might not be turned into a more generic facility in teh future

schemaStateContains

<K> boolean schemaStateContains(Statement state,
                              K key)

Check if some key is in the schema state.