/**
* Acquire an unused channel.
*
* @recoil-coroutine
*/
public function acquireChannel(Channel $channel = null) : Generator
{
// The connection is not open ...
if ($this->state !== ConnectionState::OPEN) {
throw SingleConnectionException::notOpen($this->options);
}
if ($channel !== null) {
$channelId = $channel->id();
$channelManager = $this->channels[$channelId] ?? null;
if ($channelManager === null) {
throw ChannelException::notOpen($channelId);
}
return $channelManager;
}
// Check for previously released channels that can be used instead of
// asking the broker for a new one ...
foreach ($this->availableChannels as $channelId => $channelManager) {
unset($this->availableChannels[$channelId], $this->availableChannelHeartbeats[$channelId]);
return $channelManager;
}
$channelId = $this->findChannelId();
// Open a new channel ...
$channelManager = new ChannelManager($channelId, $this, $this->transport, $this->tune->frameMax);
$this->channels[$channelId] = $channelManager;
(yield $channelManager->open());
return $channelManager;
}
/**
* @param ChannelManager $channelManager The channel used to communicate with the broker.
* @param Features $features The broker's supported features.
*/
public function __construct(ChannelManager $channelManager, Features $features)
{
$this->channelId = $channelManager->id();
$this->channelManager = $channelManager;
$this->features = $features;
}
