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https://issues.apache.org/jira/browse/TINKERPOP-1670?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stephen mallette updated TINKERPOP-1670:
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Component/s: process
> End type lost when using promise()
> ----------------------------------
>
> Key: TINKERPOP-1670
> URL: https://issues.apache.org/jira/browse/TINKERPOP-1670
> Project: TinkerPop
> Issue Type: Bug
> Components: process
> Affects Versions: 3.2.4
> Reporter: Andy Tolbert
>
> The {{Traversal.promise}} method loses type information when used so the type
> of the returned future is not as complete as it could be.
> For example:
> {code:java}
> g.V().hasLabel("person").has("name", "marko").promise(Traversal::next);
> {code}
> Returns a {{CompletableFuture<Object>}} instead of
> {{CompletableFuture<Vertex>}}.
> {code:java}
> g.V().hasLabel("person").promise(Traversal::toList);
> {code}
> Returns a {{CompletableFuture<List>}} instead of
> {{CompletableFuture<List<Vertex>}}.
> The fix for this could be as simple as adding the start and end (S,E) types
> to the traversal that is the input of the function:
> {code:java}
> public default <T> CompletableFuture<T> promise(final Function<Traversal, T>
> traversalFunction)
> {code}
> to:
> {code:java}
> public default <T> CompletableFuture<T> promise(final
> Function<Traversal<S,E>, T> traversalFunction)
> {code}
> Need to test this a bit more though, but I think that should work.
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