How to skip the loop if response not return in java

Question

My problem is say my method getAllVendorDetails() will call another method getVendordetailsById(int id), if that method getVendordetailsById() not returned response/answer within the specified time (like 30secs), I need to move to next vendor or skip the execution and show error message to the user. how can we achieve this result in Java. I tried by below code, but its not working. After it went inside the getVendordetailsById(), its not returned.

public class Test {

public static void main(String[] args) {
    long currentTime=System.currentTimeMillis();
    Date date=new Date(currentTime);
    date.setSeconds(date.getSeconds()+30);
    long end=date.getTime();
    System.out.println("Time="+(end-currentTime));

    List<Integer> vendorId= new ArrayList<Integer>();
    for (int i = 1; i <= 100000; i++) {
        vendorId.add(i);
    }
    boolean isSuccess=false;
    boolean flag=true;

    while(end>System.currentTimeMillis()){

        if(flag){
            flag=false;
            for (int i = 0; i < vendorId.size() && end>System.currentTimeMillis() ; i++) {
                getVendordetailsById(vendorId.get(i));
                isSuccess=true;
            }
        }
        System.out.println("bye");
    }

    if(isSuccess){
        System.out.println("Success");
    }else{
        System.out.println("Errorr");
    }



    System.out.println("Current time="+System.currentTimeMillis());
}

private static void getVendordetailsById(Integer id) {
    System.out.println("vendor number="+id);
    int a=0;
    for (int i = 1; i <= 1000; i++) {
        a=a+i;
    }

    System.out.println("Current value of a="+a);
}

}

you cant return method from outside. if you want some timeout logic, you must have do that in **getVendordetailsById** method — Ankit, Mar 28 '13 at 11:36
Use [Threading](http://docs.oracle.com/javase/tutorial/essential/concurrency/), perhaps? — MD Sayem Ahmed, Mar 28 '13 at 11:36
Do you have any control over the `getVendordetailsById` method? Like can you make that method non-blocking (or at least "limited blocking")? — SeKa, Mar 28 '13 at 11:48
Or check out this SO question: http://stackoverflow.com/questions/240320/how-can-i-wrap-a-method-so-that-i-can-kill-its-execution-if-it-exceeds-a-specifi, namely an answer by Alex a few down that talks about FutureTasks and Executors — SeKa, Mar 28 '13 at 12:07
Hi SeKa, I tried the FutureTasks & Executors options, it works for me, thanks. — Rajkumar, Mar 28 '13 at 13:00

score 0 · Answer 1 · answered Mar 28 '13 at 12:36

You can use the java.util.concurrent.Future to solve your problem.

First, you need to use java.util.concurrent.Executors to created a executor to submit your future job

such as

   //suggest that use it out of the loop
   //or in the static field
   java.util.concurrent.ExecutorService es = java.util.concurrent.Executors.newFixedThreadPool(1);
   //...in the loop
   Future<Object> future = es.submit(new Callable<Object>{
       public Object call(){
           getVendordetailsById 
       }
   });
   try{
      Object result = future.get(30, TimeUnit.SECONDS);
   }cache(TimeoutException te){
     break;
   }cache(Exception te){
      //other exception handler
   }

How to skip the loop if response not return in java

1 Answers1