I'm new to IBM Watson but I need to use the SpeechtoText service with asynchronous calls. I found in their documentation two solutions but I don't know what's the difference between them and which one should I use.
The first one:
To call a method asynchronously, use the enqueue method of the ServiceCall interface to receive a callback when the response arrives. The ServiceCallback interface of the method's argument provides onResponse and onFailure methods that you override to handle the callback.
The second:
The asynchronous HTTP interface of the Speech to Text service provides methods for transcribing audio via non-blocking calls to the service. The interface employs user-specified secret strings and digital signatures to provide a level of security for requests that are made over the HTTP protocol. To use the asynchronous interface, you can register a callback URL to be notified by the service of the job status and the results automatically. Poll the service to obtain the job status and the results manually.
