Example filter on model find

gistfile1.php

<?php

Posts::applyFilter('find', function($self, $params, $chain) {
	$key = // Make a cache key from $params['options']
	if ($result = Cache::read('default', $key)) {
		return $result;
	}
	$result = $chain->next($self, $params, $chain);
	Cache::write('default', $key, $result);
	return $result;
});