Bdtjtk

I have a flow: Angualr http service call API(spring boot) read file and save data in DB.

Peoblem: When httpService call api with loop, It is almost at the same time -> api read file have been conflict data of files(for one client).

Example: When api is processing file pdf A, request read file pdf B have sent, and data save in DB will conflict between file A and B. Condition check data will be conflict.
Read file pdf A: if (nonExist) -> save DB -> reset nonExist variable. But when call api with file pdf B (same time) -> nonExist variable will be not reseted -> the next time value of nonExist will be wrong.

My code below:
Controller:

@ApiOperation(value = "Import file property ware")

    @ApiImplicitParams(value = { @ApiImplicitParam(name = "File", dataTypeClass = MultipartFile.class) })

    @PostMapping(value = URL.IMPORT_FILE, consumes = CommonConstants.CONSUME_MULTI_PART)

    @ResponseBody

    public ResponseEntity<Void> doUploadExchangeRateFile(

            @RequestParam(value = "file") MultipartFile file

            , @RequestParam(value = "customerId") Long customerId

            , @RequestParam(value = "importType") Integer importType,

            HttpServletRequest request) {



            propertyWareService.importFilePdf(customerId, file, request);

        return new ResponseEntity<>(HttpStatus.OK);

    }

and service:

public StateReadPdfImport getListProperties(MultipartFile file, HttpServletRequest request, Long optCustomerId) {



    PDFTextStripper stripper;

    Boolean headerTrans = false;

    Boolean endTransaction = false;

    Boolean endBillDue = false;

    Boolean isBillDue = false;

    Boolean chkBeginning = false;

    double previousBalance;

    StringBuilder strTrans = new StringBuilder("");

    StringBuilder strBillDue = new StringBuilder("");



    int rowTrans = 0;

    int rowBillsDue = 0;



    try (PDDocument document = PDDocument.load( new File(dirFile) )) {

        int pageNumber = document.getNumberOfPages();

        PmrPropertyRequestPdf pmrPropertyRequestPdf = new PmrPropertyRequestPdf();

        pmrPropertyRequestPdf.setTransactionDetailBeginningBalance(null);

        for (int i=1; i < pageNumber + 1; i++) {

            stripper = new PropertyPdfReader();

            stripper.setSortByPosition( true );

            stripper.setStartPage(i);

            stripper.setEndPage(i);

            lines.clear();

            Writer dummy = new OutputStreamWriter(new ByteArrayOutputStream());

            stripper.writeText(document, dummy);



            previousBalance = 0D;

            int zIndex = 1;

            for (int j = 0; j < lines.size(); j+=zIndex) {

                WordAndCoordinates wordAndCoordinates = lines.get(j);

                String line = wordAndCoordinates.getWord();

                if (!isBillDue) {

                    if (line.equals("Property Cash Summary")

                            && wordAndCoordinates.getTextPosition().get(0).getFontSizeInPt() == 12.0) {

                        pmrPropertyRequestPdf.setNameAndAddress(lines.get(j-1).getWord().trim());

                    } else if (checkHeader(lines, j)) {

                        this.setHeaderTransDetail(lines, j, lstHeaderTransDetail);

                        headerTrans = true;

                        zIndex = 8;

                    } else if (headerTrans) {

                        if (line.contains(TransactionConstants.BEGINNING_CASH_BALANCE) && !chkBeginning) {

                            //reset chkBeginning = true, but in the next acces it is false

                            chkBeginning = true;

                            pmrPropertyRequestPdf.setTransactionDetailBeginningBalance(previousBalance);

                        }

                    } else if (line.equals(TransactionConstants.BILLS_DUE) && checkHeaderBillDue(lines, j + 1)) {

                        this.setHeaderTransBill(lines, j+1, lstHeaderTransBill);

                        isBillDue = true;

                        zIndex = 5;

                    }

                } else {

                    zIndex = 1;



                }

            }



            if (StringUtils.isBlank(pmrPropertyRequestPdf.getNameAndAddress())) {

                continue;

            }



            if (endTransaction) {

                this.setTransactionDetail(strTrans, pmrPropertyRequestPdf, transactionTypeMap, previousBalance, lstHeaderTransDetail, positionMap);

                //reset chkBeginning= false after save data of a page of PDF file to DB

                chkBeginning = false;

            }

            lines.clear();

        }

    } catch (Exception ex) {

        Map<String, Object> error = OhaCommonUtil.setFileException(file);

        throw new OhaApplicationException(error, HttpStatus.BAD_REQUEST, ex.getMessage());

    }

    return ...;

}

I tried google but I'm stuck and can not find anything solution!

May you help me ?

Thank you!