是否有来自List< CompletionStage>的转换器？到CompletionStage< List>在Java中？ [英] Is there a converter from List<CompletionStage> to CompletionStage<List> in Java?

问题描述

就像在使用 of 的假设示例中一样：

Like in this hypothetical example of using of:

List<CompletionStage<Long>> listOfFutureLongs = getFutureLongs(...)
CompletionStage<List<Long>> futureListOfLongs = CompletionStage.of(listOfFutureLongs)

推荐答案

Internet说，使用可完成的将来：

Internet says, use completable future:

List<CompletionStage<Long>> futureLongs = getFutureLongs();
var arr = futureLongs.toArray(new CompletableFuture[futureLongs.size()]);
CompletionStage<List<Long>> result = CompletableFuture.allOf(arr)
  .thenApply(unused -> futureLongs.stream().map(f -> f.toCompletableFuture().join()).collect(Collectors.toList()));

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