Complete level fetching when data loading finishes #2787
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This PR is an attempt to solve a problem described here
graphql-java/java-dataloader#54
The general idea is that data loader registry can return a completable future as a result of
public CompletableFuture<Integer> dispatch()
call. This future can be used by graphql-java to reliably identify level fetching completion.The current change is using the code from this PR in data loader library: graphql-java/java-dataloader#111