AbstractModel.php

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<?php
namespace Magento\ImportExport\Model;

use Magento\Framework\App\Filesystem\DirectoryList;

abstract class AbstractModel extends \Magento\Framework\DataObject
{
    protected $_debugMode = false;

    protected $_debugReplacePrivateDataKeys = [];

    protected $_logTrace = [];

    protected $_logger;

    protected $_varDirectory;

    public function __construct(
        \Psr\Log\LoggerInterface $logger,
        \Magento\Framework\Filesystem $filesystem,
        array $data = []
    ) {
        $this->_logger = $logger;
        $this->_varDirectory = $filesystem->getDirectoryWrite(DirectoryList::VAR_DIR);
        parent::__construct($data);
    }

    public function addLogComment($debugData)
    {
        if (is_array($debugData)) {
            $this->_logTrace = array_merge($this->_logTrace, $debugData);
        } else {
            $this->_logTrace[] = $debugData;
        }

        if ($this->_debugMode) {
            $this->_logger->debug(var_export($debugData, true));
        }

        return $this;
    }

    public function getFormatedLogTrace()
    {
        $trace = '';
        $lineNumber = 1;
        foreach ($this->_logTrace as &$info) {
            $trace .= $lineNumber++ . ': ' . $info . "\n";
        }
        return $trace;
    }
}