Pubnub perform sync request

Question

I have this asynchronous request:

Pubnub pn = new Pubnub(publishKey, subscribeKey, secretKey, cipherKey, enableSSL);

pn.HereNow("testchannel", res => //doesn't return a Task
{ //response
}, err =>
{ //error response
});

The problem is that I don't know how to run it synchronously. Please help.

Exult

What's Pubnub? Is that yours. – Collett

Nope pubnub.com – Exult

synchronously or asynchronously? – Collett

@Collett I'd like to perform this request synchronously. So I need to wait for a callback somehow. – Exult

Please shoot us an email at [email protected] and we'd be happy to assist you. – Judicious

@AndreiM did you contact pubnub via email for this question? – Oof

Answer 1

I'm not familiar with pubnub, but what you're trying to achieve should be as simple as this:

Pubnub pn = new Pubnub(publishKey, subscribeKey, secretKey, cipherKey, enableSSL);

var tcs = new TaskCompletionSource<PubnubResult>();

pn.HereNow("testchannel", res => //doesn't return a Task
{ //response
    tcs.SetResult(res);
}, err =>
{ //error response
    tcs.SetException(err);
});

// blocking wait here for the result or an error
var res = tcs.Task.Result; 
// or: var res = tcs.Task.GetAwaiter().GetResult();

Note that doing asynchronous stuff synchronously is not recommend. You should look at using async/await, in which case you'd do:

var result = await tcs.Task;

Byronbyrum

Awesome. Works perfectly for me. – Exult

Good solution, thanks. Last line should be var res = tcs.Task.Result – Grounder

Answer 2

I solved this issue using the @Noseratio ideia with a simple enhancement.

private Task<string> GetOnlineUsersAsync()
{
    var tcs = new TaskCompletionSource<string>();

    _pubnub.HereNow<string>(MainChannel,
        res => tcs.SetResult(res),
        err => tcs.SetException(new Exception(err.Message)));

    return  tcs.Task; 
}

// using
var users = await GetOnlineUsersAsync();

Oof