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wp-content/plugins/jetpack-boost/app/contracts/interface-has-setup.php

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+<?php
+
+namespace Automattic\Jetpack_Boost\Contracts;
+
+/**
+ * A class that has a setup step that's supposed to be executed only once.
+ */
+interface Has_Setup {
+
+	/**
+	 * This class has a setup method that should be
+	 * run only once per the request lifecycle.
+	 *
+	 * This is a good place to attach hooks
+	 * or perform other tasks that need
+	 * to be performed once.
+	 */
+	public function setup();
+}