预定时间内请求旅游报价FutureTask

private class QuoteTask implements Callable<TravelQuote>{
    
    
  private final TravelCompany company;
  private final TravelInfo travelInfo;
  ...
  public TravelQuote call() throws Exception{
    
    
    return company.solicitQuote(travelInfo);
  }
}

public List<TravelQuote> getRankedQuotes(
  TravelInfo travelInfo,Set<TravelCompany> companies,Comparator<TravelQuote> ranking,long time,TimeUnit unit
)throws InterruptedException{
    
    
  List<QuoteTask> tasks = new ArrayList<>();
  for(TravelCompany company:companies){
    
    
    tasks.add(new QuoteTask(company,travelInfo));
  }
  
  List<Future<TravelQuote>> futures = exec.invokeAll(tasks,time,unit);

  List<TravelQuote> quotes = new ArrayList<TravelQuote>(tasks.size());

  Iterator<QuoteTask> taskIter = tasks.iterator();
  for(Future<TravelQuote> f:futures){
    
    
    QuoteTask task = taskIter.next();
    try{
    
    
      quotes.add(f.get());
    }catch(ExecutionException e){
    
    
    quotes.add(task.getFailurQuote(e.getCause()));
    }catch(CancellationException e){
    
    
    quotes.add(task.getTimeoutQuote(e));
    }
  }

  Collections.sort(quotes,ranking);
  return quotes;
}