/**
* implements Iterator function
*
* @access public
* @return integer
*/
public function valid()
{
if (!$this->valid) {
$this->partition->setMessageOffset($this->offset);
// one partition iterator end
\Kafka\Protocol\Fetch\Helper\Helper::onPartitionEof($this->partition);
}
return $this->valid;
}
/**
* fetch message to broker
*
* @access public
* @return void
*/
public function fetch()
{
$data = $this->_formatPayload();
if (empty($data)) {
return false;
}
$responseData = array();
$streams = array();
foreach ($data as $host => $requestData) {
$connArr = $this->client->getStream($host);
$conn = $connArr['stream'];
$encoder = new \Kafka\Protocol\Encoder($conn);
$encoder->fetchRequest($requestData);
$streams[$connArr['key']] = $conn;
}
$fetch = new \Kafka\Protocol\Fetch\Topic($streams, $data);
// register fetch helper
$freeStream = new \Kafka\Protocol\Fetch\Helper\FreeStream($this->client);
$freeStream->setStreams($streams);
\Kafka\Protocol\Fetch\Helper\Helper::registerHelper('freeStream', $freeStream);
// register partition commit offset
$commitOffset = new \Kafka\Protocol\Fetch\Helper\CommitOffset($this->client);
$commitOffset->setGroup($this->group);
\Kafka\Protocol\Fetch\Helper\Helper::registerHelper('commitOffset', $commitOffset);
return $fetch;
}
/**
* load next topic
*
* @access public
* @return void
*/
public function loadNextTopic()
{
if ($this->validCount >= $this->topicCount) {
\Kafka\Protocol\Fetch\Helper\Helper::onStreamEof($this->currentStreamLockKey);
return false;
}
if ($this->currentStreamCount >= $this->topicCounts[$this->currentStreamKey]) {
\Kafka\Protocol\Fetch\Helper\Helper::onStreamEof($this->currentStreamLockKey);
$this->currentStreamKey++;
}
$lockKeys = array_keys($this->streams);
$streams = array_values($this->streams);
if (!isset($streams[$this->currentStreamKey])) {
return false;
}
$stream = $streams[$this->currentStreamKey];
$this->currentStreamLockKey = $lockKeys[$this->currentStreamKey];
try {
$topicLen = $stream->read(2, true);
$topicLen = Decoder::unpack(Decoder::BIT_B16, $topicLen);
$topicLen = array_shift($topicLen);
if ($topicLen <= 0) {
return false;
}
// topic name
$this->key = $stream->read($topicLen, true);
$this->current = new Partition($this, $this->context);
} catch (\Kafka\Exception $e) {
return false;
}
$this->validCount++;
$this->currentStreamCount++;
return true;
}
