ai.grakn.factory

Class SystemKeyspace<T extends org.apache.tinkerpop.gremlin.structure.Graph>

java.lang.Object

ai.grakn.factory.SystemKeyspace<T>

Type Parameters:

T -

public class SystemKeyspace<T extends org.apache.tinkerpop.gremlin.structure.Graph>
extends Object

Manages the system keyspace.

Used to populate the system ontology the first time the system keyspace is created.

Used to populate the system keyspace with all newly create keyspaces as a user opens them. We have no way to determining whether a keyspace with a given name already exists or not. We maintain the list in our Grakn system keyspace. An element is added to that list when there is an attempt to create a graph from a factory bound to the keyspace name. The list is simply the instances of the system entity type 'keyspace'. Nothing is ever removed from that list. The set of known keyspaces is maintained in a static map so we don't connect to the system keyspace every time a factory produces a new graph. That means that we can't have several different factories (e.g. Titan and in-memory Tinkerpop) at the same time sharing keyspace names. We can't identify the factory builder by engineUrl and config because we don't know what's inside the config, which is residing remotely at the engine!

Author:

borislav, fppt

Field Summary

Fields

Modifier and Type	Field and Description
static TypeLabel	KEYSPACE_ENTITY
static TypeLabel	KEYSPACE_RESOURCE
protected org.slf4j.Logger	LOG
static String	SYSTEM_GRAPH_NAME
static String	SYSTEM_ONTOLOGY_FILE
static TypeLabel	SYSTEM_VERSION

Constructor Summary

Constructors

Constructor and Description
SystemKeyspace(ai.grakn.factory.InternalFactory<T> factory)

Method Summary

Methods inherited from class java.lang.Object

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

Field Detail

SYSTEM_GRAPH_NAME

public static final String SYSTEM_GRAPH_NAME

See Also:

Constant Field Values

SYSTEM_ONTOLOGY_FILE

public static final String SYSTEM_ONTOLOGY_FILE

See Also:

Constant Field Values

KEYSPACE_ENTITY

public static final TypeLabel KEYSPACE_ENTITY

KEYSPACE_RESOURCE

public static final TypeLabel KEYSPACE_RESOURCE

SYSTEM_VERSION

public static final TypeLabel SYSTEM_VERSION

LOG

protected final org.slf4j.Logger LOG

Constructor Detail

SystemKeyspace

public SystemKeyspace(ai.grakn.factory.InternalFactory<T> factory)