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/*
* 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.rpc.filter.tps;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.rpc.Invocation;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import static org.apache.dubbo.rpc.Constants.DEFAULT_TPS_LIMIT_INTERVAL;
import static org.apache.dubbo.rpc.Constants.TPS_LIMIT_INTERVAL_KEY;
import static org.apache.dubbo.rpc.Constants.TPS_LIMIT_RATE_KEY;
/**
* DefaultTPSLimiter is a default implementation for tps filter. It is an in memory based implementation for storing
* tps information. It internally use
*
* @see org.apache.dubbo.rpc.filter.TpsLimitFilter
*/
public class DefaultTPSLimiter implements TPSLimiter {
private final ConcurrentMap stats = new ConcurrentHashMap();
@Override
public boolean isAllowable(URL url, Invocation invocation) {
int rate = url.getMethodParameter(invocation.getMethodName(), TPS_LIMIT_RATE_KEY, -1);
long interval = url.getMethodParameter(invocation.getMethodName(), TPS_LIMIT_INTERVAL_KEY, DEFAULT_TPS_LIMIT_INTERVAL);
String serviceKey = url.getServiceKey();
if (rate > 0) {
StatItem statItem = stats.get(serviceKey);
if (statItem == null) {
stats.putIfAbsent(serviceKey, new StatItem(serviceKey, rate, interval));
statItem = stats.get(serviceKey);
} else {
//rate or interval has changed, rebuild
if (statItem.getRate() != rate || statItem.getInterval() != interval) {
stats.put(serviceKey, new StatItem(serviceKey, rate, interval));
statItem = stats.get(serviceKey);
}
}
return statItem.isAllowable();
} else {
StatItem statItem = stats.get(serviceKey);
if (statItem != null) {
stats.remove(serviceKey);
}
}
return true;
}
}