How to call a method until it returns true every x minutes

Question

I have a main thread which will call the below process method from a different class..

Now what I am want to do is, if i=1 then, I will make a call to checkValue method and if it returns false , then I would like to sleep for two minutes and then again make a call to checkValue method, and if it still returns false , then again sleep for two minutes, and then again try checkValue method but now suppose if it returns true , then I would go for i=2 iteration, otherwise not.

public void process(String workflowName) {

    ..// some other code here

    for (int i = 1; i <= 10; i++) {
        try {
            .. // some other code here

            if (!checkValue()) {
                Thread.sleep(120000);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}


private boolean checkValue() throws Exception {
    boolean check_nodes = false;
    return check_nodes;
}

Is there any way to do this?

I would like to go for i=2 for loop iteration only when checkValue method returns true.. So in short, I need to keep on calling checkValue method until it returns true every 2 minutes.

Once it returns true, I won't call checkValue method for i=1 , but for i=2 , I will do the same thing again.

Answer 1

Thread.sleep(millis) suspends the current thread.

So you have to call Thread.sleep(2 * 60 * 1000) in the main thread, to sleep for two minutes.

Answer 2

int i = 1;
while ( i <=10 ){
    try{
         if(!checkValue()){
             Thread.sleep(120000);
         } else{
                i++;
         }
    } catch (Exception e) {
         e.printStackTrace();
    }

}

Answer 3

Use break if you don't want to continue the loop.

for (int i = 1; i <= 10; i++) {
    try {
        .. // some other code here

        if (!checkValue()) {
            Thread.sleep(2000 * 60);
        }
        else {
            break;
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}