Create Call Class

[mitch10e]

TaskService taskService = ServiceGenerator.createService(TaskService.class);  
Call<List<Task>> call = taskService.getTasks();  
call.enqueue(new Callback<List<Task>>() {  
    @Override
    public void onResponse(Call<List<Task>> call, Response<List<Task>> response) {
        if (response.isSuccessful()) {
            // tasks available
        } else {
            // error response, no access to resource?
        }
    }

    @Override
    public void onFailure(Call<List<Task>> call, Throwable t) {
        // something went completely south (like no internet connection)
        Log.d("Error", t.getMessage());
    }
}

[mitch10e]

enum Response {
    case .success
    case .failure
}

[cbh2000]

Results of our API discussion for Response enum: https://gist.github.com/cbh2000/e1403a479cbfd9198f86c5adb60ab1d5