ai.grakn.migration.base

Class Migrator

java.lang.Object

ai.grakn.migration.base.Migrator

public class Migrator
extends Object

Abstract migrator class containing methods and functionality needed by all extending migrator classes.

Author:

alexandraorth, Domenico Corapi

Constructor Summary

Constructors

Constructor and Description
Migrator(ai.grakn.util.SimpleURI uri, ai.grakn.Keyspace keyspace, int retries, boolean failFast, int maxDelayMs, int maxLines)

Method Summary

Modifier and Type	Method and Description
void	load(String template, java.util.stream.Stream<Map<String,Object>> data) Migrate data constrained by this migrator using a loader configured by the provided parameters.
void	print(String template, java.util.stream.Stream<Map<String,Object>> data) Print data passed in data parameter using the given template
protected java.util.stream.Stream<ai.grakn.graql.Query>	template(String template, Map<String,Object> data, boolean failFast)

Methods inherited from class java.lang.Object

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

Constructor Detail

Migrator

public Migrator(ai.grakn.util.SimpleURI uri,
                ai.grakn.Keyspace keyspace,
                int retries,
                boolean failFast,
                int maxDelayMs,
                int maxLines)

Parameters:

uri - Uri where one instance of Grakn Engine is running

keyspace - The Keyspace where the data should be persisted

Method Detail

print

public void print(String template,
                  java.util.stream.Stream<Map<String,Object>> data)

Print data passed in data parameter using the given template

Parameters:

template - Used to transform the data

data - Data being migrated

load

public void load(String template,
                 java.util.stream.Stream<Map<String,Object>> data)

Migrate data constrained by this migrator using a loader configured by the provided parameters.

Parameters:

template - Template used to extract the data

data - Data being migrated

template

protected java.util.stream.Stream<ai.grakn.graql.Query> template(String template,
                                                                 Map<String,Object> data,
                                                                 boolean failFast)

Parameters:

template - a string representing a templated graql query

data - data used in the template

Returns:

an insert query