How to send requests synchronously?

[yvasyliev]

Hi!

Is there any chance to send requests to Telegram API synchronously? In my application I need some things to do one by one.

[cavallium]

You can wrap the send request into a CompletableFuture.

public static <T extends TdApi.Object> T sendSynchronously(TelegramClient client, TdApi.Function request, int timeoutSeconds)
		throws ExecutionException, InterruptedException {
	var response = new CompletableFuture<>();

	client.send(request, response::complete, response::completeExceptionally);
	return (T) response.completeOnTimeout(new TdApi.Error(408, "Request Timeout"), timeoutSeconds, TimeUnit.SECONDS).get();
}

Example:

TdApi.User me = sendSynchronously(tc, new TdApi.GetMe(), 10);

[lexanderav]

the work of this function gives me a Request Timeout, but I'm doing everything right. what could be the problem ?

[yvasyliev]

@lexanderav, it may take some time for Telegram functions to return a result, so you have two options:

• increase value of timeoutSeconds
• use join instead of completeOnTimeout:

  @SuppressWarnings("unchecked")
  public <T extends TdApi.Object> T send(TelegramClient client, TdApi.Function<T> request) {
      var response = new CompletableFuture<>();
      client.send(request, response::complete, response::completeExceptionally);
      return (T) response.join();
  }

[lexanderav]

Thanks for your reply. I increase the value of timeoutSeconds but no response comes.
If to use ResultHandler the answer comes.
Using join also doesn't work. Waited a long time.