PhpOrient\Protocols\Binary\Transaction\TxCommit::_getTransactionId PHP 메소드

    protected function _getTransactionId()
    {
        if ($this->_txId < 0) {
            $myEpoch = strtotime('2014-12-01');
            $myNow = microtime(true) - $myEpoch;
            $myNowMS = (int) ($myNow * 1000);
            $Shifted = $myNowMS << 12;
            $this->_txId = $Shifted + mt_rand(0, 4095);
            # remove sign
            # treat as unsigned even when the INT is signed
            # and take 4 Bytes
            #   ( 32 bit uniqueness is not ensured in any way,
            #     but is surely unique in this session )
            # we need only a transaction unique for this session
            # not a real UUID
            if ($this->_txId & 0x80000000) {
                $this->_txId = $this->_txId - 0x80000000 & 0xffffffff;
            } else {
                $this->_txId = $this->_txId & 0xffffffff;
            }
        }
        return $this->_txId;
    }