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<?php

namespace Socket\React\EventLoop;

use React\EventLoop\LoopInterface;

use \Exception;

// modelled closely after React\EventLoop\StreamSelectLoop

class SelectPoller extends SocketSelectLoop

{

private $loop;

private $tid = null;

private $pollInterval = 0.01;

private $pollDurationSec = 0;

private $pollDurationUsec = 0;

public function __construct(LoopInterface $loop)

{

parent::__construct();

$this->loop = $loop;

}

public function setPollInterval($pollInterval)

{

$this->pollInterval = $pollInterval;

// restart with new interval in case it's currently running

if ($this->tid !== null) {

$this->pause();

$this->resume();

}

}

public function getPollInterval()

{

return $this->pollInterval;

}

public function setPollDuration($pollDuration)

{

$this->pollDurationSec = (int)$pollDuration;

$this->pollDurationUsec = (int)(($pollDuration - (int)$pollDuration) * 1000000);

}

public function getPollDuration()

{

return ($this->pollDurationSec + $this->pollDurationUsec / 1000000);

}

/**

* notify poller to schedule polling ASAP for next tick

*

* this doesn't neccessary have to actually do anything (and in fact

* it does NOT at the moment...), but it's purpose is to notify the

* main loop that something in this poller instance has (likely) changed

* and polling should be performed ASAP. This could re-schedule the

* timer to poll in the next available tick instead of waiting for the

* timer to expire.

*

* @return self $this (chainable)

* @todo actually do something. this is a no-op currently

*/

public function notify()

{

return $this;

}

private function resume()

{

if ($this->tid === null && $this->hasListeners()) {

$this->tid = $this->loop->addPeriodicTimer($this->pollInterval, array($this, 'poll'));

}

}

private function pause()

{

if ($this->tid !== null && !$this->hasListeners()) {

$this->loop->cancelTimer($this->tid);

$this->tid = null;

}

}

public function poll()

{

$this->runStreamSelect();

}

protected function getNextEventTimeInMicroSeconds()

{

return $this->getPollDuration() * 1000000;

}

public function addReadStream($stream, $listener)

{

parent::addReadStream($stream, $listener);

$this->resume();

}

public function addWriteStream($stream, $listener)

{

parent::addWriteStream($stream, $listener);

$this->resume();

}

public function removeReadStream($stream)

{

parent::removeReadStream($stream);

$this->pause();

}

public function removeWriteStream($stream)

{

parent::removeWriteStream($stream);

$this->pause();

}

public function removeStream($stream)

{

parent::removeStream($stream);

$this->pause();

}

public function tick()

{

return $this->loop->tick();

}

public function run()

{

return $this->loop->run();

}

public function stop()

{

return $this->loop->stop();

}

}