Iterator<Pair<Q, E> > com.griddynamics.jagger.invoker.OneByOneLoadBalancer< Q, E >.provide

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Returns an iterator over pairs.

Author

Grid Dynamics

Details:

Returns an iterator over pairs, which were created by "One by one" algorithm

Returns

iterator over pairs

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

Definition at line 58 of file OneByOneLoadBalancer.java.

                                          {
        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() {
                boolean exceeded = endpointSupplier.exceeded();

                E endpoint = endpointSupplier.pop();
                Q query = exceeded ? querySupplier.pop() : querySupplier.peek();

                return Pair.of(query, endpoint);

            }

            @Override
            public void remove() {
                throw new UnsupportedOperationException("Read only iterator");
            }

            @Override
            public String toString() {
                return "OneByOneLoadBalancer iterator";
            }

        };
    }