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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4 foldmethod=marker: */
// +---------------------------------------------------------------------------
// | SWAN [ $_SWANBR_SLOGAN_$ ]
// +---------------------------------------------------------------------------
// | Copyright $_SWANBR_COPYRIGHT_$
// +---------------------------------------------------------------------------
// | Version $_SWANBR_VERSION_$
// +---------------------------------------------------------------------------
// | Licensed ( $_SWANBR_LICENSED_URL_$ )
// +---------------------------------------------------------------------------
// | $_SWANBR_WEB_DOMAIN_$
// +---------------------------------------------------------------------------
namespace Kafka\Protocol\Fetch;
use \Kafka\Protocol\Decoder;
/**
+------------------------------------------------------------------------------
* Kafka protocol since Kafka v0.8
+------------------------------------------------------------------------------
*
* @package
* @version $_SWANBR_VERSION_$
* @copyright Copyleft
* @author $_SWANBR_AUTHOR_$
+------------------------------------------------------------------------------
*/
class MessageSet implements \Iterator
{
// {{{ members
/**
* kafka socket object
*
* @var mixed
* @access private
*/
private $stream = null;
/**
* messageSet size
*
* @var float
* @access private
*/
private $messageSetSize = 0;
/**
* validByteCount
*
* @var float
* @access private
*/
private $validByteCount = 0;
/**
* messageSet offset
*
* @var float
* @access private
*/
private $offset = 0;
/**
* valid
*
* @var mixed
* @access private
*/
private $valid = false;
/**
* partition object
*
* @var \Kafka\Protocol\Fetch\Partition
* @access private
*/
private $partition = null;
/**
* request fetch context
*
* @var array
*/
private $context = array();
// }}}
// {{{ functions
// {{{ public function __construct()
/**
* __construct
*
* @param \Kafka\Socket $stream
* @param int $initOffset
* @access public
* @return void
*/
public function __construct(\Kafka\Protocol\Fetch\Partition $partition, $context = array())
{
$this->stream = $partition->getStream();
$this->partition = $partition;
$this->context = $context;
$this->messageSetSize = $this->getMessageSetSize();
\Kafka\Log::log("messageSetSize: {$this->messageSetSize}", LOG_INFO);
}
// }}}
// {{{ public function current()
/**
* current
*
* @access public
* @return void
*/
public function current()
{
return $this->current;
}
// }}}
// {{{ public function key()
/**
* key
*
* @access public
* @return void
*/
public function key()
{
return $this->validByteCount;
}
// }}}
// {{{ public function rewind()
/**
* implements Iterator function
*
* @access public
* @return integer
*/
public function rewind()
{
$this->valid = $this->loadNextMessage();
}
// }}}
// {{{ public function valid()
/**
* implements Iterator function
*
* @access public
* @return integer
*/
public function valid()
{
if (!$this->valid) {
$this->partition->setMessageOffset($this->offset);
// one partition iterator end
\Kafka\Protocol\Fetch\Helper\Helper::onPartitionEof($this->partition);
}
return $this->valid;
}
// }}}
// {{{ public function next()
/**
* implements Iterator function
*
* @access public
* @return integer
*/
public function next()
{
$this->valid = $this->loadNextMessage();
}
// }}}
// {{{ protected function getMessageSetSize()
/**
* get message set size
*
* @access protected
* @return integer
*/
protected function getMessageSetSize()
{
// read message size
$data = $this->stream->read(4, true);
$data = Decoder::unpack(Decoder::BIT_B32, $data);
$size = array_shift($data);
if ($size <= 0) {
throw new \Kafka\Exception\OutOfRange($size . ' is not a valid message size');
}
return $size;
}
// }}}
// {{{ public function loadNextMessage()
/**
* load next message
*
* @access public
* @return void
*/
public function loadNextMessage()
{
if ($this->validByteCount >= $this->messageSetSize) {
return false;
}
try {
if ($this->validByteCount + 12 > $this->messageSetSize) {
// read socket buffer dirty data
$this->stream->read($this->messageSetSize - $this->validByteCount);
return false;
}
$offset = $this->stream->read(8, true);
$this->offset = \Kafka\Protocol\Decoder::unpack(Decoder::BIT_B64, $offset);
$messageSize = $this->stream->read(4, true);
$messageSize = Decoder::unpack(Decoder::BIT_B32, $messageSize);
$messageSize = array_shift($messageSize);
$this->validByteCount += 12;
if (($this->validByteCount + $messageSize) > $this->messageSetSize) {
// read socket buffer dirty data
$this->stream->read($this->messageSetSize - $this->validByteCount);
return false;
}
$msg = $this->stream->read($messageSize, true);
$this->current = new Message($msg);
} catch (\Kafka\Exception $e) {
\Kafka\Log::log("already fetch: {$this->validByteCount}, {$e->getMessage()}", LOG_INFO);
return false;
}
$this->validByteCount += $messageSize;
return true;
}
// }}}
// {{{ public function messageOffset()
/**
* current message offset in producer
*
* @return void
*/
public function messageOffset()
{
return $this->offset;
}
// }}}
// }}}
}
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