/**
* Set the pre-fetch limits for this connection.
*
* @recoil-coroutine
*
* The pre-fetch count is the maximum number of unacknowledged messages that
* are delivered to this connection.
*
* The pre-fetch limit is the maximum total size of unacknowledge messages
* (in bytes) that is delivered to this connection.
*
* This feature is incompatible with the "per_consumer_qos" broker
* capability.
*
* RabbitMQ does not support per-connection 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).
* @param Channel|null $channel The application-managed channel to use (null = auto-managed).
*
* @throws NotSupportedException The broker does not support this feature.
* @throws ConnectionException The connection is closed.
*/
public function setQosLimits(int $count = null, int $size = null, Channel $channel = null) : Generator
{
assert($size === null || $size > 0);
assert($count === null || $count > 0);
if ($this->connectionManager === null) {
throw SingleConnectionException::notOpen($this->options);
} elseif ($this->features->perConsumerQos) {
throw NotSupportedException::incompatibleCapability('per-connection QoS limits', 'per_consumer_qos');
} elseif ($size !== null && !$this->features->qosSizeLimits) {
throw NotSupportedException::unsupportedFeature('pre-fetch size limits');
}
$channelManager = (yield $this->connectionManager->acquireChannel($channel));
try {
(yield $channelManager->call(BasicQosFrame::create($size ?: 0, $count ?: 0, true), BasicQosOkFrame::METHOD_ID));
} finally {
if ($channel === null) {
$channelManager->release();
}
}
}
/**
* 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, $count ?: 0, false), BasicQosOkFrame::METHOD_ID));
}
/**
* Open the consumer.
*
* @recoil-coroutine
*
* While a consumer is open, it will consume messages from the queue.
* Messages are read by using the consumer as a readable channel.
*
* The consumer may be reopened after it has been closed.
*
* @throws ResourceLockedException Another connection has exclusive access to the queue.
* @throws ResourceNotFoundException The queue does not exist.
* @throws ConnectionException The connection is closed.
* @throws ChannelException The channel is closed.
*/
public function open() : Generator
{
assert($this->state === self::STATE_CLOSED);
try {
$this->state = self::STATE_OPENING;
$this->channelManager = (yield $this->connectionManager->acquireChannel($this->channel));
if ($this->preFetchCount !== null || $this->preFetchSize !== null) {
$this->channelManager->setDirty();
(yield $this->channelManager->call(BasicQosFrame::create($this->preFetchSize, $this->preFetchCount, false), BasicQosOkFrame::METHOD_ID));
}
try {
$frame = (yield $this->channelManager->call(BasicConsumeFrame::create($this->queue->name(), $this->tag, $this->options->noLocal, $this->options->noAck, $this->options->exclusive), BasicConsumeOkFrame::METHOD_ID));
} catch (AmqpException $e) {
if ($e->getCode() === Constants::ACCESS_REFUSED) {
throw ResourceLockedException::queueHasExclusiveConsumer($this->queue->name(), $e);
} elseif ($e->getCode() === Constants::NOT_FOUND) {
throw ResourceNotFoundException::queueNotFound($this->queue->name(), $e);
} else {
throw $e;
}
}
$this->tag = $frame->consumerTag;
$this->state = self::STATE_OPEN;
$this->channelManager->addDeliverListener($this->tag, $this);
} catch (Throwable $e) {
$this->cleanup();
throw $e;
}
}
