Iterator<Pair<Q, E> > com.griddynamics.jagger.invoker.RoundRobinLoadBalancer< Q, E >.provide ( )

Returns an iterator over pairs.

Author: Mairbek Khadikov

Details:

Returns an iterator over pairs, which were created by Round-Robin algorithm

Returns: iterator over pairs

Implements com.griddynamics.jagger.invoker.LoadBalancer< Q, E >.

                                           {
         final CircularSupplier<Q> querySupplier = CircularSupplier.create(queryProvider);
         final CircularSupplier<E> endpointSupplier = CircularSupplier.create(endpointProvider);
 
         return new Iterator<Pair<Q, E>>() {
             @Override
             public boolean hasNext() {
                 return true;
             }
 
             @Override
             public Pair<Q, E> next() {
                 E endpoint = endpointSupplier.pop();
                 Q query = querySupplier.pop();
                 return Pair.of(query, endpoint);
             }
 
             @Override
             public void remove() {
                 throw new UnsupportedOperationException("Read only iterator");
             }
 
             @Override
             public String toString() {
                 return "RoundRobinLoadBalancer iterator";
             }
         };
     }