*
   * <p>Example:
   *
   * <pre>{@code
   * final ListenableFuture<Instant> loginDateFuture =
   *     loginService.findLastLoginDate(username);
   * final ListenableFuture<List<String>> recentCommandsFuture =
   *     recentCommandsService.findRecentCommands(username);
   * ListenableFuture<UsageHistory> usageFuture =
   *     Futures.whenAllSucceed(loginDateFuture, recentCommandsFuture)
   *         .call(