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<?php
namespace React\Http\Io;
use Evenement\EventEmitter;
use React\Stream\ReadableStreamInterface;
use React\Stream\Util;
use React\Stream\WritableStreamInterface;
/**
* [Internal] Pauses a given stream and buffers all events while paused
*
* This class is used to buffer all events that happen on a given stream while
* it is paused. This allows you to pause a stream and no longer watch for any
* of its events. Once the stream is resumed, all buffered events will be
* emitted. Explicitly closing the resulting stream clears all buffers.
*
* Note that this is an internal class only and nothing you should usually care
* about.
*
* @see ReadableStreamInterface
* @internal
*/
class PauseBufferStream extends EventEmitter implements ReadableStreamInterface
{
private $input;
private $closed = false;
private $paused = false;
private $dataPaused = '';
private $endPaused = false;
private $closePaused = false;
private $errorPaused;
private $implicit = false;
public function __construct(ReadableStreamInterface $input)
{
$this->input = $input;
$this->input->on('data', array($this, 'handleData'));
$this->input->on('end', array($this, 'handleEnd'));
$this->input->on('error', array($this, 'handleError'));
$this->input->on('close', array($this, 'handleClose'));
}
/**
* pause and remember this was not explicitly from user control
*
* @internal
*/
public function pauseImplicit()
{
$this->pause();
$this->implicit = true;
}
/**
* resume only if this was previously paused implicitly and not explicitly from user control
*
* @internal
*/
public function resumeImplicit()
{
if ($this->implicit) {
$this->resume();
}
}
public function isReadable()
{
return !$this->closed;
}
public function pause()
{
if ($this->closed) {
return;
}
$this->input->pause();
$this->paused = true;
$this->implicit = false;
}
public function resume()
{
if ($this->closed) {
return;
}
$this->paused = false;
$this->implicit = false;
if ($this->dataPaused !== '') {
$this->emit('data', array($this->dataPaused));
$this->dataPaused = '';
}
if ($this->errorPaused) {
$this->emit('error', array($this->errorPaused));
return $this->close();
}
if ($this->endPaused) {
$this->endPaused = false;
$this->emit('end');
return $this->close();
}
if ($this->closePaused) {
$this->closePaused = false;
return $this->close();
}
$this->input->resume();
}
public function pipe(WritableStreamInterface $dest, array $options = array())
{
Util::pipe($this, $dest, $options);
return $dest;
}
public function close()
{
if ($this->closed) {
return;
}
$this->closed = true;
$this->dataPaused = '';
$this->endPaused = $this->closePaused = false;
$this->errorPaused = null;
$this->input->close();
$this->emit('close');
$this->removeAllListeners();
}
/** @internal */
public function handleData($data)
{
if ($this->paused) {
$this->dataPaused .= $data;
return;
}
$this->emit('data', array($data));
}
/** @internal */
public function handleError(\Exception $e)
{
if ($this->paused) {
$this->errorPaused = $e;
return;
}
$this->emit('error', array($e));
$this->close();
}
/** @internal */
public function handleEnd()
{
if ($this->paused) {
$this->endPaused = true;
return;
}
if (!$this->closed) {
$this->emit('end');
$this->close();
}
}
/** @internal */
public function handleClose()
{
if ($this->paused) {
$this->closePaused = true;
return;
}
$this->close();
}
}
|
