Filter Lithium's SQL describe method so that the schema can be cached and retrieved quickly

gistfile1.php

<?php
// I have this in my bootstrap/cache.php file
Dispatcher::applyFilter('run', function ($self, $params, $chain) {
	foreach (Connections::get() as $connection) {
		$connection = Connections::get($connection);
		$connection->applyFilter('describe', function($self, $params, $chain) {
			if (!empty($params['fields'])) {
				$fields = $params['fields'];
				return $self->invokeMethod('_instance', array('schema', compact('fields')));
			}
	
			$key = 'SC.Schema.' . $self->invokeMethod('_entityName', array($params['entity']));
			$schema = Cache::read('read_only', $key);
	
			if ($schema) {
				$fields = $schema;
				return $self->invokeMethod('_instance', array('schema', compact('fields')));
			}
	
			$schema = $chain->next($self, $params, $chain);
	
			Cache::write('default', $key, $schema->fields(), '+1 day');
	
			return $schema;
		});
	}
});
?>