mirror of
https://github.com/danog/parallel.git
synced 2024-12-11 16:49:51 +01:00
82 lines
2.2 KiB
PHP
82 lines
2.2 KiB
PHP
<?php
|
|
|
|
namespace Amp\Parallel\Sync;
|
|
|
|
use Amp\ByteStream\InputStream;
|
|
use Amp\ByteStream\OutputStream;
|
|
use Amp\ByteStream\StreamException;
|
|
use Amp\Promise;
|
|
use function Amp\call;
|
|
|
|
/**
|
|
* An asynchronous channel for sending data between threads and processes.
|
|
*
|
|
* Supports full duplex read and write.
|
|
*/
|
|
final class ChannelledStream implements Channel
|
|
{
|
|
/** @var \Amp\ByteStream\InputStream */
|
|
private $read;
|
|
|
|
/** @var \Amp\ByteStream\OutputStream */
|
|
private $write;
|
|
|
|
/** @var \SplQueue */
|
|
private $received;
|
|
|
|
/** @var \Amp\Parser\Parser */
|
|
private $parser;
|
|
|
|
/**
|
|
* Creates a new channel from the given stream objects. Note that $read and $write can be the same object.
|
|
*
|
|
* @param \Amp\ByteStream\InputStream $read
|
|
* @param \Amp\ByteStream\OutputStream $write
|
|
*/
|
|
public function __construct(InputStream $read, OutputStream $write)
|
|
{
|
|
$this->read = $read;
|
|
$this->write = $write;
|
|
$this->received = new \SplQueue;
|
|
$this->parser = new ChannelParser([$this->received, 'push']);
|
|
}
|
|
|
|
/**
|
|
* {@inheritdoc}
|
|
*/
|
|
public function send($data): Promise
|
|
{
|
|
return call(function () use ($data): \Generator {
|
|
try {
|
|
return yield $this->write->write($this->parser->encode($data));
|
|
} catch (StreamException $exception) {
|
|
throw new ChannelException("Sending on the channel failed. Did the context die?", 0, $exception);
|
|
}
|
|
});
|
|
}
|
|
|
|
/**
|
|
* {@inheritdoc}
|
|
*/
|
|
public function receive(): Promise
|
|
{
|
|
return call(function (): \Generator {
|
|
while ($this->received->isEmpty()) {
|
|
try {
|
|
$chunk = yield $this->read->read();
|
|
} catch (StreamException $exception) {
|
|
throw new ChannelException("Reading from the channel failed. Did the context die?", 0, $exception);
|
|
}
|
|
|
|
if ($chunk === null) {
|
|
throw new ChannelException("The channel closed unexpectedly. Did the context die?");
|
|
}
|
|
|
|
$this->parser->push($chunk);
|
|
}
|
|
|
|
return $this->received->shift();
|
|
});
|
|
}
|
|
}
|