Export::exportAction

public function exportAction()
{
	/** @global CMain */
	global $APPLICATION;

	if ($this->isNewProcess)
	{
		$this->fileType = $this->getFileType();
		$this->fileName = $this->generateExportFileName();
		$this->filePath = $this->generateTempDirPath(). $this->fileName;
		$this->processedItems = 0;
		$this->totalItems = 0;
		$this->pageSize = self::ROWS_PER_PAGE;
		$this->saveProgressParameters();
	}

	$this->startTimer(self::TIME_LIMIT);
	do
	{
		$nextPage = (int)floor($this->processedItems / $this->pageSize) + 1;

		$componentParameters = array_merge(
			$this->componentParameters,
			array(
				'STEXPORT_MODE' => 'Y',
				'EXPORT_TYPE' => $this->exportType,
				'STEXPORT_PAGE_SIZE' => $this->pageSize,
				'STEXPORT_TOTAL_ITEMS' => $this->totalItems,
				'STEXPORT_LAST_EXPORTED_ID' => $this->lastExportedId,
				'PAGE_NUMBER' => $nextPage,
			)
		);

		ob_start();
		$componentResult = $APPLICATION->IncludeComponent(
			$this->componentName,
			'',
			$componentParameters
		);
		$exportData = ob_get_contents();
		ob_end_clean();

		$processedItemsOnStep = 0;

		if (is_array($componentResult))
		{
			if (isset($componentResult['ERROR']))
			{
				$this->addError(new Error($componentResult['ERROR']));
				break;
			}
			else
			{
				if (isset($componentResult['PROCESSED_ITEMS']))
				{
					$processedItemsOnStep = (int)$componentResult['PROCESSED_ITEMS'];
				}

				// Get total items quantity on 1st step.
				if ($nextPage === 1 && isset($componentResult['TOTAL_ITEMS']))
				{
					$this->totalItems = (int)$componentResult['TOTAL_ITEMS'];
				}

				if (isset($componentResult['LAST_EXPORTED_ID']))
				{
					$this->lastExportedId = (int)$componentResult['LAST_EXPORTED_ID'];
				}
			}
		}

		if ($this->totalItems == 0)
		{
			break;
		}

		if ($processedItemsOnStep > 0)
		{
			$this->processedItems += $processedItemsOnStep;

			$this->writeTempFile($exportData, ($nextPage === 1));
			unset($exportData);

			$this->isExportCompleted = ($this->processedItems >= $this->totalItems);

			if ($this->isExportCompleted && !$this->isCloudAvailable)
			{
				// adjust completed file size
				$this->fileSize = $this->getSizeTempFile();
			}
		}
		elseif ($processedItemsOnStep == 0)
		{
			// Smth went wrong - terminate process.
			$this->isExportCompleted = true;

			if (!$this->isCloudAvailable)
			{
				$this->fileSize = $this->getSizeTempFile();
			}
		}

		if ($this->isExportCompleted === true)
		{
			// finish
			break;
		}
		if ($nextPage === 1)
		{
			// to answer faster
			break;
		}
	}
	while ($this->hasTimeLimitReached() !== true);

	if ($this->totalItems == 0)
	{
		$this->isExportCompleted = true;

		// Save progress
		$this->saveProgressParameters();

		// finish
		$result = $this->preformAnswer(self::ACTION_VOID);
		$result['STATUS'] = self::STATUS_COMPLETED;
	}
	else
	{
		// Save progress
		$this->saveProgressParameters();

		$result = $this->preformAnswer(self::ACTION_EXPORT);
		$result['STATUS'] = self::STATUS_PROGRESS;
	}

	return $result;
}