ایجاد یک عملیات تجاری PEX

public class OcrOperation extends BusinessOperation {

    // Connection to InterSystems IRIS
    private IRIS iris;

    @Override
    public void OnInit() throws Exception {
        iris = GatewayContext.getIRIS();
    }

    @Override
    public Object OnMessage(Object request) throws Exception {
        IRISObject req = (IRISObject) request;
        String filePath = req.getString("FileName");
        String ocrText = doOcr(filePath);
        IRISObject response = (IRISObject)(iris.classMethodObject("Ens.StringContainer","%New",ocrText));
        return response;
    }

    public String doOcr(String filePath) {

        File tempFile = new File(filePath);

        String ocrText = "";

        try {

            if (tempFile.toString().contains(".pdf")) {
                ocrText = extractTextFromPDF(tempFile);
            } else {
                ocrText = extractTextFromImage(tempFile);
            }

            return ocrText;

        } catch (IllegalStateException | IOException | TesseractException e) {
            return e.getMessage();
        }

    }

    private String extractTextFromPDF(File tempFile) throws IOException, TesseractException {

        String ocrText = "";

        // Load file into PDFBox class
        PDDocument document;
        document = PDDocument.load(tempFile);

        // Extract images from file
        PDFRenderer pdfRenderer = new PDFRenderer(document);
        StringBuilder out = new StringBuilder();

        ITesseract tesseract = new Tesseract();
        tesseract.setDatapath("/usr/share/tessdata/"); //directory to trained models 
        tesseract.setLanguage("por"); // choose your language/trained model

        for (int page = 0; page < document.getNumberOfPages(); page++) {
            BufferedImage bim = pdfRenderer.renderImageWithDPI(page, 300, ImageType.RGB);

            // Create a temp image file
            File temp = File.createTempFile("tempfile_" + page, ".png");
            ImageIO.write(bim, "png", temp);

            String result = tesseract.doOCR(temp);
            out.append(result);

            // Delete temp file
            Files.delete(temp.toPath());

            ocrText = out.toString();
        }

        return ocrText;

    }

    private String extractTextFromImage(File tempFile) throws TesseractException {

        ITesseract tesseract = new Tesseract();
        tesseract.setDatapath("/usr/share/tessdata/"); //directory to trained models
        tesseract.setLanguage("eng+por"); // choose your language/trained model

        return tesseract.doOCR(tempFile); //call tesseract function doOCR() 
                                          //passing the file to be processed with OCR technique

    }

    @Override
    public void OnTearDown() throws Exception {
        // TODO Auto-generated method stub

    }

Class dc.ocr.OcrProduction Extends Ens.Production
{

XData ProductionDefinition
{
<Production Name="dc.ocr.OcrProduction" LogGeneralTraceEvents="false">
  <Description></Description>
  <ActorPoolSize>2</ActorPoolSize>
  <Item Name="OcrService" Category="" ClassName="dc.ocr.OcrService" PoolSize="1" Enabled="true" Foreground="false" Comment="" LogTraceEvents="false" Schedule=""> 
  </Item>
  <Item Name="JavaGateway" Category="" ClassName="EnsLib.JavaGateway.Service" PoolSize="1" Enabled="true" Foreground="false" Comment="" LogTraceEvents="false" Schedule="">
    <Setting Target="Host" Name="ClassPath">.:/usr/irissys/dev/java/lib/JDK18/*:/opt/irisapp/*:/usr/irissys/dev/java/lib/gson/*:/usr/irissys/dev/java/lib/jackson/*:/jgw/ocr-pex-1.0.0.jar</Setting> 
    <Setting Target="Host" Name="JavaHome">/usr/lib/jvm/java-8-openjdk-amd64/</Setting> 
  </Item> 
  <Item Name="OcrOperation" Category="" ClassName="EnsLib.PEX.BusinessOperation" PoolSize="1" Enabled="true" Foreground="false" Comment="" LogTraceEvents="false" Schedule=""> 
    <Setting Target="Host" Name="%gatewayPort">55555</Setting> 
    <Setting Target="Host" Name="%remoteClassname">community.intersystems.pex.ocr.OcrOperation</Setting> 
    <Setting Target="Host" Name="%gatewayExtraClasspaths">.:/usr/irissys/dev/java/lib/JDK18/*:/opt/irisapp/*:/usr/irissys/dev/java/lib/gson/*:/usr/irissys/dev/java/lib/jackson/*:/jgw/ocr-pex-1.0.0.jar</Setting> 
  </Item> 
</Production>
}

}