/**
* Set the pre-fetch limits for consumers on this channel.
*
* @recoil-coroutine
*
* Only consumers created after setting the limits are affected.
*
* The pre-fetch count is the maximum number of unacknowledged messages that
* are delivered to each consumer on this channel.
*
* The pre-fetch limit is the maximum total size of unacknowledge messages
* (in bytes) that is delivered to this channel.
*
* This feature requires the "per_consumer_qos" broker capability.
*
* RabbitMQ does not support pre-fetch size limits (current as of v3.5.6).
*
* @param int|null $count The pre-fetch count limit (null = unlimited).
* @param int|null $size The pre-fetch size limit (null = unlimited).
*
* @throws NotSupportedException The broker does not support this feature.
* @throws ConnectionException The connection is closed.
* @throws ChannelException The channel is closed.
*/
public function setConsumerQosLimits(int $count = null, int $size = null) : Generator
{
assert($size === null || $size > 0);
assert($count === null || $count > 0);
if ($this->channelManager === null) {
throw ChannelException::notOpen($this->channelId);
} elseif (!$this->features->perConsumerQos) {
throw NotSupportedException::missingCapability('per-consumer QoS limits', 'per_consumer_qos');
} elseif ($size !== null && !$this->features->qosSizeLimits) {
throw NotSupportedException::unsupportedFeature('pre-fetch size limits');
}
$this->channelManager->setDirty();
(yield $this->channelManager->call(BasicQosFrame::create($size ?: 0, $count ?: 0, false), BasicQosOkFrame::METHOD_ID));
}
/**
* Get the next available channel ID.
*
* @throws ChannelException No channels are available.
*/
private function findChannelId() : int
{
// first check in range [next, max] ...
for ($channelId = $this->nextChannelId; $channelId <= $this->tune->channelMax; ++$channelId) {
if (!isset($this->channels[$channelId])) {
$this->nextChannelId = $channelId + 1;
return $channelId;
}
}
// then check in range [min, next) ...
for ($channelId = 1; $channelId < $this->nextChannelId; ++$channelId) {
if (!isset($this->channels[$channelId])) {
$this->nextChannelId = $channelId + 1;
return $channelId;
}
}
throw ChannelException::noAvailableChannels();
}
/**
* @recoil-coroutine
*/
public function onCloseByBroker(ChannelCloseFrame $frame) : Generator
{
$this->connectionManager->removeChannel($this->channelId);
$exception = AmqpException::create($frame->replyText, $frame->replyCode);
// The closure was triggered by a previously sent frame. Find the
// offending strand and resume it with an exception specific to this
// closure ...
if ($frame->classId && $frame->methodId) {
$sentMethod = $frame->classId << 16 | $frame->methodId;
($callers =& $this->callersBySentMethod[$sentMethod]) ?? null;
if ($callers !== null) {
foreach ($callers as $id => $waitMethod) {
$strand = $this->callers[$waitMethod][$id];
unset($this->callers[$waitMethod][$id], $this->callersBySentMethod[$sentMethod][$id], $this->callersByWaitMethod[$waitMethod][$id]);
(yield Recoil::throw($strand, $exception));
break;
}
}
}
// Acknowledge the closure ...
$frame = new ChannelCloseOkFrame();
$frame->frameChannelId = $this->channelId;
(yield $this->transport->write($frame));
// Procee to the regular on-close logic. To all remaining callers and
// listeners this is an unexpected closure ...
(yield $this->onClose(ChannelException::closedUnexpectedly($this->channelId, $exception)));
}