Kraken\Runtime\RuntimeModel::start PHP Method

    public function start()
    {
        $state = $this->getState();
        if ($state === Runtime::STATE_DESTROYED) {
            return Promise::doReject(new RejectionException("It is not possible to start runtime from state [{$state}]."));
        } else {
            if ($state === Runtime::STATE_STARTED) {
                return Promise::doResolve('Runtime has been already started.');
            }
        }
        $this->setState(Runtime::STATE_STARTED);
        $emitter = $this->getEventEmitter();
        $emitter->emit('beforeStart');
        $emitter->emit('start');
        $emitter->emit('afterStart');
        return Promise::doResolve('Runtime has been started.');
    }