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Thread.sleep() in a while loop
String state = get state via RPC call
while (!state.equals("complete")) {
    Thread.sleep(10000); // Wait 10 seconds
    state = {update state via RPC call}
}

public class Foo{
  private Lock lock;
  private Condition c1;
  private Condition c2;

  public Foo()
  {
    lock = new SimpleLock();
    c1 = lock.newCondition();
    c2 = lock.newCondition();
    ...
  }

  public void doIt()
  {
    try{
      lock.lock();
      ...
      while(...){
        c1.awaitUninterruptibly();
      }
      ...
      c2.signal();
    }
    finally{
      lock.unlock();
    }
  }
}