Hi,
The root traversal of a traversal is the one whose traversal.getParent()
instanceof EmptyStep.
In our strategies we use:
traversal.getParent().equals(EmptyStep.instance())
traversal.getParent() == EmptyStep.instance()
traversal.getParent() instanceof EmptyStep
Which way is fastest?
import org.apache.tinkerpop.gremlin.process.traversal.step.util.EmptyStep
random = new Random()
x = []
for(int i=0;i<10000;i++) {
select = random.nextInt(3)
if(0 == select)
x.add(EmptyStep.instance())
if(1 == select)
x.add(i)
else
x.add(UUID.randomUUID())
}
gremlin> clock(1000){ x.each{ it instanceof EmptyStep }}
==>0.7513385119999999
gremlin> clock(1000){ x.each{ it == EmptyStep }}
==>1.526259428
gremlin> clock(1000){ x.each{ it.equals(EmptyStep) }}
==>2.829880314
Seems “instanceof” is the winner.
Marko.
http://markorodriguez.com
