dubbo Ring 源码
dubbo Ring 代码
文件路径：/dubbo-common/src/main/java/org/apache/dubbo/common/threadpool/manager/Ring.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.dubbo.common.threadpool.manager;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.atomic.AtomicInteger;
public class Ring<T> {
AtomicInteger count = new AtomicInteger();
private List<T> itemList = new CopyOnWriteArrayList<T>();
public void addItem(T t) {
if (t != null) {
itemList.add(t);
}
}
public T pollItem() {
if (itemList.isEmpty()) {
return null;
}
if (itemList.size() == 1) {
return itemList.get(0);
}
if (count.intValue() > Integer.MAX_VALUE - 10000) {
count.set(count.get() % itemList.size());
}
int index = Math.abs(count.getAndIncrement()) % itemList.size();
return itemList.get(index);
}
public T peekItem() {
if (itemList.isEmpty()) {
return null;
}
if (itemList.size() == 1) {
return itemList.get(0);
}
int index = Math.abs(count.get()) % itemList.size();
return itemList.get(index);
}
public List<T> listItems() {
return Collections.unmodifiableList(itemList);
}
}
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