Use threading to process file chunk by chunk

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感情败类
感情败类 2021-01-22 14:56

I have a arraylist which consists of 5000 IP Addresses. For each IP Address, I want to execute a SNMPGet request and a FTPDownload command. I want to implement it in a fashion,

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  •  醉梦人生
    2021-01-22 15:17

    Executor Framework will be best suit for your solution. I have created one example here. You can increase the number of threads as per your requirement.

    import java.util.ArrayList;
    import java.util.List;
    import java.util.concurrent.ExecutorService;
    import java.util.concurrent.Executors;
    
    class SomeRunnable implements Runnable {
        int threadNo = -1 ;
        List list = new ArrayList();
        public SomeRunnable(List list, int threadNo ) {
            this.list.addAll(list);
            this.threadNo =threadNo;
        }
        @Override
        public void run() {
            for (String element : list) {
                System.out.println("By Thread:" + threadNo+", Processed Element:" +element);
            }
        }
    
    }
    
    public class ExecutorDemo {
        public static void main(String[] args) {
            List list = new ArrayList();
            for (int i = 0; i < 100; i++) {
                list.add("Elem:"+i);
            }
            // Divide list 
            int divideIndex = list.size()/2;
            //Create objects of Runnable
            SomeRunnable obj1 = new SomeRunnable(list.subList(0, divideIndex),1);
            SomeRunnable obj2 = new SomeRunnable(list.subList(divideIndex,list.size()),2);
    
            //Create fixed Thread pool, here pool of 2 thread will created
            ExecutorService pool = Executors.newFixedThreadPool(2);
    
            pool.execute(obj1);
            pool.execute(obj2);
    
            pool.shutdown();
        }
    
    }
    

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