Added lazy records collector to pass around.

src/Record/Collector/Lazy_Proxy_Collector.php

@@ -0,0 +1,38 @@
+<?php
+declare( strict_types=1 );
+
+namespace Rarst\Laps\Record\Collector;
+
+use Rarst\Laps\Record\Record_Interface;
+
+/**
+ * Collects records from concrete collectors set on access.
+ */
+class Lazy_Proxy_Collector implements Record_Collector_Interface {
+
+	/** @var array|Record_Collector_Interface[] */
+	private $collectors;
+
+	/**
+	 * Lazy_Proxy_Collector constructor.
+	 *
+	 * @param Record_Collector_Interface[] $collectors Array of collectors to store for processing.
+	 */
+	public function __construct( array $collectors ) {
+		$this->collectors = $collectors;
+	}
+
+	/**
+	 * @return Record_Interface[]
+	 */
+	public function get_records(): array {
+		$records = [];
+
+		/** @var Record_Collector_Interface $collector */
+		foreach ( $this->collectors as $collector ) {
+			$records[] = $collector->get_records();
+		}
+
+		return count( $records ) ? array_merge( ...$records ) : [];
+	}
+}