Returns a new CompletionStage that, when either this or the
other given stage complete normally, executes the given action
using this stage's default asynchronous execution facility.
See the {@link CompletionStage} documentation for rules
covering exceptional completion.
@param other the other CompletionStage
@param action the action to perform before completing the
returned CompletionStage
@return the new CompletionStage
Returns a new CompletionStage that, when either this or the other given stage complete normally, executes the given action using this stage's default asynchronous execution facility.
See the {@link CompletionStage} documentation for rules covering exceptional completion.
@param other the other CompletionStage @param action the action to perform before completing the returned CompletionStage @return the new CompletionStage