com.alibaba.nacos.client.naming.utils.GenericPoller Maven / Gradle / Ivy
/*
* Copyright 1999-2018 Alibaba Group Holding Ltd.
*
* 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 com.alibaba.nacos.client.naming.utils;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
/**
* Generic Poller.
*
* @author nkorange
*/
public class GenericPoller implements Poller {
private final AtomicInteger index = new AtomicInteger(0);
private List items = new ArrayList<>();
public GenericPoller(List items) {
this.items = items;
}
@Override
public T next() {
return items.get(Math.abs(index.getAndIncrement() % items.size()));
}
@Override
public Poller refresh(List items) {
return new GenericPoller<>(items);
}
}