JanusGraph: property TTL

Just like how we defined TTL(time to live)  on edge and vertex level, we can define TTL on property level.

 

You can define ttl at property level using ‘janusGraphManagement.setTTL’ method.

PropertyKey propertyKey = janusGraphManagement.makePropertyKey("tempKey").dataType(String.class).make();
janusGraphManagement.setTTL(propertyKey, Duration.ofSeconds(10));
janusGraphManagement.commit();

 

Find the below working application.

 

PropertyTTL.java

package com.sample.app.schema;

import java.time.Duration;
import java.util.concurrent.TimeUnit;

import org.apache.tinkerpop.gremlin.structure.VertexProperty;
import org.janusgraph.core.JanusGraph;
import org.janusgraph.core.JanusGraphFactory;
import org.janusgraph.core.JanusGraphVertex;
import org.janusgraph.core.PropertyKey;
import org.janusgraph.core.schema.JanusGraphManagement;
import org.janusgraph.diskstorage.BackendException;

public class PropertyTTL {

	public static void main(String args[]) throws InterruptedException, BackendException {
		JanusGraph janusGraph = null;

		try {
			janusGraph = JanusGraphFactory.open("/Users/Shared/janus.properties");
			JanusGraphManagement janusGraphManagement = janusGraph.openManagement();

			PropertyKey propertyKey = janusGraphManagement.makePropertyKey("tempKey").dataType(String.class).make();
			janusGraphManagement.setTTL(propertyKey, Duration.ofSeconds(10));
			janusGraphManagement.commit();

			JanusGraphVertex janusGraphVertex = janusGraph.addVertex("login");

			// Add properties to the vertex
			janusGraphVertex.property("tempKey", "AGGF&!^@%ASASSF");
			janusGraph.tx().commit();

			Object id = janusGraphVertex.id();
			JanusGraphVertex janusGraphVertex1 = (JanusGraphVertex) janusGraph.vertices(id).next();
			VertexProperty<String> vertexProperty = janusGraphVertex1.property("tempKey");
			System.out.println("tempKey : " + vertexProperty.value());

			System.out.println("\nGoing to sleep for 15 seconds");
			TimeUnit.SECONDS.sleep(15);
			janusGraph.tx().commit();

			janusGraphVertex1 = (JanusGraphVertex) janusGraph.vertices(id).next();
			vertexProperty = janusGraphVertex1.property("tempKey");

			if (vertexProperty == null) {
				System.out.println("\nNo property found with tempKey");
			} else {
				System.out.println("\ntempKey : " + vertexProperty.value());
			}

		} finally {
			// drop the graph. This is an irreversible operation that will delete all graph
			// and index data.
			JanusGraphFactory.drop(janusGraph);
			System.out.println("Done!!!");
		}

	}

}

 

Output

 

tempKey : AGGF&!^@%ASASSF

Going to sleep for 15 seconds
Done!!!
Exception in thread "main" java.lang.IllegalStateException: The property does not exist as it has no key, value, or associated element
	at org.apache.tinkerpop.gremlin.structure.Property$Exceptions.propertyDoesNotExist(Property.java:147)
	at org.apache.tinkerpop.gremlin.structure.util.empty.EmptyVertexProperty.value(EmptyVertexProperty.java:74)
	at com.sample.app.schema.PropertyTTL.main(PropertyTTL.java:43)

 

 

 

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