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<?php
namespace React\EventLoop;
/**
* @internal
*/
final class SignalsHandler
{
private $signals = array();
public function add($signal, $listener)
{
if (!isset($this->signals[$signal])) {
$this->signals[$signal] = array();
}
if (\in_array($listener, $this->signals[$signal])) {
return;
}
$this->signals[$signal][] = $listener;
}
public function remove($signal, $listener)
{
if (!isset($this->signals[$signal])) {
return;
}
$index = \array_search($listener, $this->signals[$signal], true);
unset($this->signals[$signal][$index]);
if (isset($this->signals[$signal]) && \count($this->signals[$signal]) === 0) {
unset($this->signals[$signal]);
}
}
public function call($signal)
{
if (!isset($this->signals[$signal])) {
return;
}
foreach ($this->signals[$signal] as $listener) {
\call_user_func($listener, $signal);
}
}
public function count($signal)
{
if (!isset($this->signals[$signal])) {
return 0;
}
return \count($this->signals[$signal]);
}
public function isEmpty()
{
return !$this->signals;
}
}