Question

I have a requirement in which I have to check whether any file exists in the folder. If yes, then I need to process it one by one. With my basic knowledge I have arrived to a code structure which I have posted below.

I’m creating an infinite loop and checking whether the file exists in that folder. If yes, then I’m creating a thread and processing it, else it waits for a min and checks again.

class sample {    
    synchronized int getNoOfFiles() {
        // get number of files in the folder
    }    
    synchronized void openFile() {
        // open one file
    }
    synchronized void getFileContents() {
        // get the file content
    }
    synchronized void processFileContent() {
        //performing some operation on file contents
    }    
    synchronized void closeFile() {
        //closing the file
    }    
    synchronized void deleteFile() {
        //delete the file
    }

}    
class Test {    
    public static void main(String args[]) {
        int flag=0;
        Sample obj = new Sample();
        while(1) {
            flag = obj.getNoOfFiles();    
            if(flag) {
                for(i=0;i<flag;i++) {
                    MyThread1 t1 = new MyThread1() {
                        public void run() {
                            obj.openFile();
                            obj.getFileContents();
                            obj.processFileContent();
                            obj.closeFile();
                            obj.deleteFile();
                        }
                    };    
                    t1.start();
                }
            }
            else {
                try {
                    Thread.sleep(60000);
                }
            }    
        }
    }    
}

Answer 1

I would suggest using a ScheduledExecutorService:

ScheduledExecutorService executor = new ScheduledThreadPoolExecutor(1);
executor.scheduleAtFixedRate(new Runnable() {
        public void run()
        {
            obj.openFile();
            obj.getFileContents();
            obj.processFileContent();
            obj.closeFile();
            obj.deleteFile();
         }
    }, 0, 1, TimeUnit.MINUTES);