/*
 * Copyright 2016 Netflix, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package io.reactivex.netty.client.loadbalancer;

import rx.Single;
import rx.functions.Func1;

import java.util.List;

public interface HostCollector {

    <W, R> Func1<HostUpdate<W, R>, Single<List<HostHolder<W, R>>>> newCollector();

    final class HostUpdate<W, R> {

        public enum Action{ Add, Remove }

        private final Action action;
        private final HostHolder<W, R> hostHolder;

        public HostUpdate(Action action, HostHolder<W, R> hostHolder) {
            this.action = action;
            this.hostHolder = hostHolder;
        }

        public Action getAction() {
            return action;
        }

        public HostHolder<W, R> getHostHolder() {
            return hostHolder;
        }
    }

}
