How do you return a value from inside a ResponseHandler?

[ringodingoflamingo]

Hello, I'm having fun with your Twitch API Wrapper and up untill now it has done everything that i wanted to do.

There is one question I would like to ask. I'm trying to create a "Pass me the latest highlight" functionality so my IRCBot could handle and respond to a "!latesthighlight" command.

Up until now I've got this:

public String getLatestHighlight() {
    RequestParams params = new RequestParams();
    params.put("limit", "1");
    params.put("broadcasts", "false");
    VideosResponseHandler videos = new VideosResponseHandler() {
        @Override
        public void onSuccess(int i, List<Video> list) {
            if (!list.isEmpty()) {
                // This would be the desired outcome: list.get(0).getDescription() + " - " + list.get(0).getUrl()
            }
        }

        @Override
        public void onFailure(int statusCode, String statusMessage, String errorMessage) {
            System.out.println("failure1");
        }

        @Override
        public void onFailure(Throwable e) {
            System.out.println("failure2");
        }
    };
    twitch.channels().getVideos("ringoshiba", params, videos);
    return <the string>
}

The problem is the asynchronous nature of the implementation. At the point of "return" the string would always be empty (Tried it with a 1 capacity arraylist and handling the "arraylist.add" in the onSuccess). Is there a way to let your the API return the response immediately (as in, block until there is a response)?

Regards,

Ringo

[Gikkman]

One solution could be to make your irc bot's broadcast method visible inside the onSucess() handle.

For example:

   OnSuccess{
        Bot.Broadcast( list.get(0).getDescription() + " - " + list.get(0).getUrl() );
    }

That's how I would do it.

(Sorry for formatting, writing via phone)

[ringodingoflamingo]

Thanks for the reply Gikkman.

Yeah, that's what I thought would be the only way to do it at this moment. I wanted to encapsulate as much as i can (Have the twitchAPI return everything i need, handle bot broadcasting inside the chatlistener class), but as of now, I dont think there is another way (yet?!) with this wrapper.

Thanks again,

Ringo

[Gikkman]

The API doesn't support it, unfortunately.

It might be possible to wait for a response via some kind of hack solution. But that's not how this wrapper's intended to be used, judging from it's implementation ;-)

[MaximKulikov]

You code return String empty coz the line
return
exetute b4 line
// This would be the desired outcome: list.get(0).getDescription() + " - " + list.get(0).getUrl()

You can simply use Thread.sleep b4 return line, or something more complicated.

Here what i do:

class Example {
    public Boolean checkUserSubscribed(String user) {
        
        //Any object for lock
        final Object lock = new Object();
        
        //Here you store data from inside onSuccess
        final Boolean[] userSubscribed = new Boolean[2];
        
        // Used for lock
        userSubscribed[1] = false;

        twitch.channels().getSubscription(thisChannel.getName(), user, new ChannelSubscriptionResponseHandler() {
            
            @Override
            public void onSuccess(ChannelSubscription channelSubscription) {
                //my return data
                userSubscribed[0] = true;
                
                //set to get out of while
                userSubscribed[1] = true;
                synchronized (lock) {
                    //wake main mathod thread
                    lock.notifyAll();
                }
            }

            @Override
            public void onFailure(int i, String s, String s1) {
                //my return data
                userSubscribed[0] = false;
                
                //set to get out of while
                userSubscribed[1] = true;


                synchronized (lock) {
                    //wake main mathod thread
                    lock.notifyAll();
                }

            }

            @Override
            public void onFailure(Throwable throwable) {
                //my return data
                userSubscribed[0] = false;
                
                //set to get out of while
                userSubscribed[1] = true;
                synchronized (lock) {
                    //wake main mathod thread
                    lock.notifyAll();
                }

            }
        });


        synchronized (lock) {
            // while here in case that line magicaly execute after ResponseHandler()
            while (!userSubscribed[1]) {
                try {
                    //wait for ResponseHandler() done
                    lock.wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }

        // got data here, HORAY
        return userSubscribed[0];
    }
}