abstract class AbstractProcessor implements ProcessorInterface {
    protected mixed $data;  // or properties..
    protected mixed $processedData;

    public function getData(): void {
        $this->data = $this->_getData(/* db.. */);
    }

    public function processData(): void {
        $this->processedData = $this->_processData($this->data);
    }

    // similar methods

    abstract protected function _getData(/* args */): mixed;
    abstract protected function _processData(mixed $data): mixed;
    // etc
}