dubbo StatItem 源码
dubbo StatItem 代码
文件路径：/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/filter/tps/StatItem.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.rpc.filter.tps;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
/**
* Judge whether a particular invocation of service provider method should be allowed within a configured time interval.
* As a state it contain name of key ( e.g. method), last invocation time, interval and rate count.
*/
class StatItem {
private final String name;
private final AtomicLong lastResetTime;
private final long interval;
private final AtomicInteger token;
private final int rate;
StatItem(String name, int rate, long interval) {
this.name = name;
this.rate = rate;
this.interval = interval;
this.lastResetTime = new AtomicLong(System.currentTimeMillis());
this.token = new AtomicInteger(rate);
}
public boolean isAllowable() {
long now = System.currentTimeMillis();
if (now > lastResetTime.get() + interval) {
token.set(rate);
lastResetTime.set(now);
}
return token.decrementAndGet() >= 0;
}
public long getInterval() {
return interval;
}
public int getRate() {
return rate;
}
long getLastResetTime() {
return lastResetTime.get();
}
int getToken() {
return token.get();
}
@Override
public String toString() {
return "StatItem " +
"[name=" + name + ", " +
"rate = " + rate + ", " +
"interval = " + interval + ']';
}
}
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