com.alibaba.nacos.client.config.impl.Limiter 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.config.impl;
import com.alibaba.nacos.client.env.NacosClientProperties;
import com.alibaba.nacos.client.utils.LogUtils;
import com.alibaba.nacos.shaded.com.google.common.cache.Cache;
import com.alibaba.nacos.shaded.com.google.common.cache.CacheBuilder;
import com.alibaba.nacos.shaded.com.google.common.util.concurrent.RateLimiter;
import org.slf4j.Logger;
import java.util.concurrent.TimeUnit;
/**
* Limiter.
*
* @author Nacos
*/
public class Limiter {
private static final Logger LOGGER = LogUtils.logger(Limiter.class);
private static final int CAPACITY_SIZE = 1000;
private static final int LIMIT_TIME = 1000;
private static final Cache CACHE = CacheBuilder.newBuilder().initialCapacity(CAPACITY_SIZE)
.expireAfterAccess(1, TimeUnit.MINUTES).build();
private static final String LIMIT_TIME_PROPERTY = "limitTime";
/**
* qps 5.
*/
private static double limit = 5;
static {
try {
String limitTimeStr = NacosClientProperties.PROTOTYPE.getProperty(LIMIT_TIME_PROPERTY, String.valueOf(limit));
limit = Double.parseDouble(limitTimeStr);
LOGGER.info("limitTime:{}", limit);
} catch (Exception e) {
LOGGER.error("init limitTime fail", e);
}
}
/**
* Judge whether access key is limited.
*
* @param accessKeyID access key
* @return true if is limited, otherwise false
*/
public static boolean isLimit(String accessKeyID) {
RateLimiter rateLimiter = null;
try {
rateLimiter = CACHE.get(accessKeyID, () -> RateLimiter.create(limit));
} catch (Exception e) {
LOGGER.error("create limit fail", e);
}
if (rateLimiter != null && !rateLimiter.tryAcquire(LIMIT_TIME, TimeUnit.MILLISECONDS)) {
LOGGER.error("access_key_id:{} limited", accessKeyID);
return true;
}
return false;
}
}