CollectorInterface.php

<?php

declare(strict_types = 1);

namespace Beat\Pyr;

interface CollectorInterface
{
    /**
     * Return the name of the collector.
     *
     * @return string
     */
    public function getName() : string;

    /**
     * Register all metrics associated with the collector.
     *
     * The metrics needs to be registered on the exporter object.
     * eg:
     * ```php
     * $exporter->registerCounter('search_requests_total', 'The total number of search requests.');
     * ```
     *
     * @param PrometheusExporter $exporter
     */
    public function registerMetrics(PrometheusExporter $exporter) : void;

    /**
     * Collect metrics data, if need be, before exporting.
     *
     * As an example, this may be used to perform time consuming database queries and set the value of a counter
     * or gauge.
     */
    public function collect() : void;
}