silverstripe-framework/core/Flushable.php

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<?php
/**
* Provides an interface for classes to implement their own flushing functionality
* whenever flush=1 is requested.
*
* @package framework
* @subpackage core
*/
interface Flushable {
/**
* This function is triggered early in the request if the "flush" query
* parameter has been set. Each class that implements Flushable implements
* this function which looks after it's own specific flushing functionality.
*
* @see FlushRequestFilter
*/
public static function flush();
}