| /* |
| * 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 com.alibaba.dubbo.rpc.filter.tps; |
| |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| class StatItem { |
| |
| private String name; |
| |
| private long lastResetTime; |
| |
| private long interval; |
| |
| private AtomicInteger token; |
| |
| private int rate; |
| |
| StatItem(String name, int rate, long interval) { |
| this.name = name; |
| this.rate = rate; |
| this.interval = interval; |
| this.lastResetTime = System.currentTimeMillis(); |
| this.token = new AtomicInteger(rate); |
| } |
| |
| public boolean isAllowable() { |
| long now = System.currentTimeMillis(); |
| if (now > lastResetTime + interval) { |
| token.set(rate); |
| lastResetTime = now; |
| } |
| |
| int value = token.get(); |
| boolean flag = false; |
| while (value > 0 && !flag) { |
| flag = token.compareAndSet(value, value - 1); |
| value = token.get(); |
| } |
| |
| return flag; |
| } |
| |
| long getLastResetTime() { |
| return lastResetTime; |
| } |
| |
| int getToken() { |
| return token.get(); |
| } |
| |
| @Override |
| public String toString() { |
| return new StringBuilder(32).append("StatItem ") |
| .append("[name=").append(name).append(", ") |
| .append("rate = ").append(rate).append(", ") |
| .append("interval = ").append(interval).append("]") |
| .toString(); |
| } |
| |
| } |