Nifi: How to make write and check operations in file in one thread (processor)?

[#1]

How to make only one point (Processor or Service) that will write the file and make it working in single thread, in my case i have workflow like this executescript1(single thread processor with write operations)->updateAttribute->InvokeHttpProcessor->executescript1(single thread processor with check operations (it is the first processor)) i have tried the code below but it nor fulfills sucessfully neither trows exception,

WHAT SHOULD I CHANGE?

here is my code:

  File file = new File("C:/Users/Desktop/test/conf.xml");
            String content = "";
            BufferedReader s;
            BufferedWriter w;
            RandomAccessFile ini= new RandomAccessFile(file, "rwd");
            FileLock lock= ini.getChannel().lock();
    
            try {
             def flowFile=session.get();
    		 if(flowFile==null){
            
                    String sCurrentLine;
                s = new BufferedReader(Channels.newReader(ini.getChannel(), "UTF-8"));
    
    
                while ((sCurrentLine = s.readLine()) != null) {
                    content += sCurrentLine;
                }
                ini.seek(0);
    			
    			  def flowFile1=session.create()
                    flowFile1 = session.putAttribute(flowFile1, "filename", "conf.xml");
                    session.write(flowFile1, new StreamCallback() {
                        @Override
                        public void process(InputStream inputStream1, OutputStream outputStream) throws IOException {
    
                            outputStream.write(content.getBytes(StandardCharsets.UTF_8))
                        }
    
                    });
    
                    
                    session.transfer(flowFile1,REL_SUCCESS);
    			
    			 def xml = new XmlParser().parseText(content);
    			 xml.'**'.findAll{it.name() == 'run'}.each{ it.replaceBody 'false'}
                def newxml=XmlUtil.serialize(xml);
                
                String data =newxml;
    			
                if (!data.isEmpty()) {
                    ini.setLength(0);
                    w = new BufferedWriter(Channels.newWriter(ini.getChannel(), "UTF-8"));
                    w.write(data);
                    lock.release();
                    w.close();
    
    
    
    
                }
    			}
    			
    			
    			else{
    			def   serviceName=flowFile.getAttribute('serviceName');
    			def date=flowFile.getAttribute('filename').substring(0,10);
                if(serviceName=='Decl'){
              def xml = new XmlParser().parseText(content)
                for(int i=0;i<names.size();i++) {
                    date = names.get(i).substring(0, 10);
                    xml.RS.Decl.details.findAll({ p ->
                        p.runAs[0].text() == "false" && p.start[0].text() == date.toString()
                    }).each({ p ->
                        p.start[0].value = addDays( p.start[0].text())
                        p.runAs[0].value = "true"
                    })
                }
                def newXml=  groovy.xml.XmlUtil.serialize( xml )
               
                data = newXml.toString()
                if (!data.isEmpty()) {
                     ini.setLength(0);
                    w = new BufferedWriter(Channels.newWriter(ini.getChannel(), "UTF-8"));
                    w.write(data);
    				    lock.release();
                    w.close();
    
    			
    			}
    			}
    			else  if(serviceName=='TaxyFee'){
    			  def xml = new XmlParser().parseText(content)
                for(int i=0;i<names.size();i++) {
                    date = names.get(i).substring(0, 10);
                    xml.RS.TaxyFee.details.findAll({ p ->
                        p.runAs[0].text() == "false" && p.start[0].text() == date.toString()
                    }).each({ p ->
                        p.start[0].value = addDays( p.start[0].text())
                        p.runAs[0].value = "true"
                    })
                }
                def newXml=  groovy.xml.XmlUtil.serialize( xml )
               
                data = newXml.toString()
                if (!data.isEmpty()) {
                     ini.setLength(0);
                    w = new BufferedWriter(Channels.newWriter(ini.getChannel(), "UTF-8"));
                    w.write(data);
    				    lock.release();
                    w.close();
    
    			
    			}
    			}
    			}
    
    			
    
            } catch (FileNotFoundException e) {
                //e.printStackTrace();
                TimeUnit.SECONDS.sleep(50000);
            } catch (IOException e) {
                e.printStackTrace();
    
            } catch(OverlappingFileLockException e){ TimeUnit.SECONDS.sleep(50000);
                lock.release();
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
    
                //lock.release();
                ini.close();
            }