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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;
    }
}

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