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https://issues.apache.org/jira/browse/TINKERPOP-1490?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15670602#comment-15670602
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ASF GitHub Bot commented on TINKERPOP-1490:
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Github user newkek commented on the issue:
https://github.com/apache/tinkerpop/pull/478
I think the `promise()` method is more elegant as well, as it avoids adding
many new methods in the Traversal API
> Provider a Future based Traversal.async(Function<Traversal,V>) terminal step
> ----------------------------------------------------------------------------
>
> Key: TINKERPOP-1490
> URL: https://issues.apache.org/jira/browse/TINKERPOP-1490
> Project: TinkerPop
> Issue Type: Improvement
> Components: language-variant, process
> Affects Versions: 3.2.2
> Reporter: Marko A. Rodriguez
>
> [~mbroecheler] had the idea of adding a {{Traversal.async()}} method. This is
> important for not only avoiding thread locking on a query in Gremlin, but
> also, it will allow single threaded language variants like Gremlin-JavaScript
> to use callbacks for processing query results.
> {code}
> Future<List<String>> result =
> g.V().out().values("name").async(Traversal::toList)
> {code}
> {code}
> Future<List<String>> result = g.V().out().name.async{it.toList()}
> {code}
> {code}
> g.V().out().values('name').async((err,names) => {
> // I don't know JavaScript, but ...
> return list(names);
> })
> {code}
> ...
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