java - CompletionStage：在异常块内返回 CompletionStage

Question

CompletionStage如果发生异常，有没有办法返回一个新的？

的 APIexceptionally似乎不允许您这样做。有没有解决的办法？

基本上我想为这个案子做flatMap( thenCompose)exceptionally

public CompletionStage<String> cleanupTask() {
  //DO something long running
}

public CompletionStage<String> workThatCanFail() {
  //Some long running task that may fail
}

public void action() {

CompletionStage<String> work = 
    workThatCanFail()
    .exceptionally(throwable -> cleanupTask());

}