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dispatcher.php
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dispatcher.php
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<?php
require_once('filesystem.php');
require_once('args.php');
class dispatcher
{
function attach($access)
{
$this->access = $access;
}
function insert($procedure)
{
$mangled = $procedure->mangled();
!isset($this->procedures[$mangled]) or runtime_error('Duplicate procedure: ' . $mangled);
$this->procedures[$mangled] = $procedure;
}
function query($name, $args, $document)
{
$procedure = $this->get($name, $args);
if($permission = $procedure->permission())
{
$this->access->query(vars::apply_assoc($permission, $args, true)) or runtime_error('Procedure ' . $name . ' doesn\'t meet permission ' . $permission);
}
if($procedure->cache())
{
$mangled = procedure::mangle_values($name, $args);
if(!isset($this->cache[$mangled]))
{
$this->cache[$mangled] = $procedure->query($args, $document);
}
return $this->cache[$mangled];
}
else
{
return $procedure->query($args, $document);
}
}
function parse_query($expression, $document)
{
if(preg_match('/\A([\w:]+)\(([^\)]*)\)\Z/', $expression, $match))
{
return $this->query($match[1], args::decode($match[2]), $document);
}
else
{
if(!isset($this->cache[$expression]))
{
$this->cache[$expression] = xml::load($expression);
}
return $this->cache[$expression];
}
}
private function get($name, $args)
{
$mangled = procedure::mangle($name, $args);
isset($this->procedures[$mangled]) or runtime_error('Unknown procedure: ' . $mangled);
return $this->procedures[$mangled];
}
private $access = null;
private $cache = array();
private $procedures = array();
}
?>