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| <pre><span class="source-line-no">001</span><span id="line-1">/*</span> |
| <span class="source-line-no">002</span><span id="line-2"> * Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="source-line-no">003</span><span id="line-3"> * or more contributor license agreements. See the NOTICE file</span> |
| <span class="source-line-no">004</span><span id="line-4"> * distributed with this work for additional information</span> |
| <span class="source-line-no">005</span><span id="line-5"> * regarding copyright ownership. The ASF licenses this file</span> |
| <span class="source-line-no">006</span><span id="line-6"> * to you under the Apache License, Version 2.0 (the</span> |
| <span class="source-line-no">007</span><span id="line-7"> * "License"); you may not use this file except in compliance</span> |
| <span class="source-line-no">008</span><span id="line-8"> * with the License. You may obtain a copy of the License at</span> |
| <span class="source-line-no">009</span><span id="line-9"> *</span> |
| <span class="source-line-no">010</span><span id="line-10"> * http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="source-line-no">011</span><span id="line-11"> *</span> |
| <span class="source-line-no">012</span><span id="line-12"> * Unless required by applicable law or agreed to in writing, software</span> |
| <span class="source-line-no">013</span><span id="line-13"> * distributed under the License is distributed on an "AS IS" BASIS,</span> |
| <span class="source-line-no">014</span><span id="line-14"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span> |
| <span class="source-line-no">015</span><span id="line-15"> * See the License for the specific language governing permissions and</span> |
| <span class="source-line-no">016</span><span id="line-16"> * limitations under the License.</span> |
| <span class="source-line-no">017</span><span id="line-17"> */</span> |
| <span class="source-line-no">018</span><span id="line-18">package org.apache.hadoop.hbase.quotas;</span> |
| <span class="source-line-no">019</span><span id="line-19"></span> |
| <span class="source-line-no">020</span><span id="line-20">import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;</span> |
| <span class="source-line-no">021</span><span id="line-21">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">022</span><span id="line-22">import org.apache.yetus.audience.InterfaceStability;</span> |
| <span class="source-line-no">023</span><span id="line-23"></span> |
| <span class="source-line-no">024</span><span id="line-24">/**</span> |
| <span class="source-line-no">025</span><span id="line-25"> * This limiter will refill resources at every TimeUnit/resources interval. For example: For a</span> |
| <span class="source-line-no">026</span><span id="line-26"> * limiter configured with 10resources/second, then 1 resource will be refilled after every 100ms</span> |
| <span class="source-line-no">027</span><span id="line-27"> * (1sec/10resources)</span> |
| <span class="source-line-no">028</span><span id="line-28"> */</span> |
| <span class="source-line-no">029</span><span id="line-29">@InterfaceAudience.Private</span> |
| <span class="source-line-no">030</span><span id="line-30">@InterfaceStability.Evolving</span> |
| <span class="source-line-no">031</span><span id="line-31">public class AverageIntervalRateLimiter extends RateLimiter {</span> |
| <span class="source-line-no">032</span><span id="line-32"> private long nextRefillTime = -1L;</span> |
| <span class="source-line-no">033</span><span id="line-33"></span> |
| <span class="source-line-no">034</span><span id="line-34"> @Override</span> |
| <span class="source-line-no">035</span><span id="line-35"> public long refill(long limit) {</span> |
| <span class="source-line-no">036</span><span id="line-36"> final long now = EnvironmentEdgeManager.currentTime();</span> |
| <span class="source-line-no">037</span><span id="line-37"> if (nextRefillTime == -1) {</span> |
| <span class="source-line-no">038</span><span id="line-38"> // Till now no resource has been consumed.</span> |
| <span class="source-line-no">039</span><span id="line-39"> nextRefillTime = EnvironmentEdgeManager.currentTime();</span> |
| <span class="source-line-no">040</span><span id="line-40"> return limit;</span> |
| <span class="source-line-no">041</span><span id="line-41"> }</span> |
| <span class="source-line-no">042</span><span id="line-42"></span> |
| <span class="source-line-no">043</span><span id="line-43"> long timeInterval = now - nextRefillTime;</span> |
| <span class="source-line-no">044</span><span id="line-44"> long delta = 0;</span> |
| <span class="source-line-no">045</span><span id="line-45"> long timeUnitInMillis = super.getTimeUnitInMillis();</span> |
| <span class="source-line-no">046</span><span id="line-46"> if (timeInterval >= timeUnitInMillis) {</span> |
| <span class="source-line-no">047</span><span id="line-47"> delta = limit;</span> |
| <span class="source-line-no">048</span><span id="line-48"> } else if (timeInterval > 0) {</span> |
| <span class="source-line-no">049</span><span id="line-49"> double r = ((double) timeInterval / (double) timeUnitInMillis) * limit;</span> |
| <span class="source-line-no">050</span><span id="line-50"> delta = (long) r;</span> |
| <span class="source-line-no">051</span><span id="line-51"> }</span> |
| <span class="source-line-no">052</span><span id="line-52"></span> |
| <span class="source-line-no">053</span><span id="line-53"> if (delta > 0) {</span> |
| <span class="source-line-no">054</span><span id="line-54"> this.nextRefillTime = now;</span> |
| <span class="source-line-no">055</span><span id="line-55"> }</span> |
| <span class="source-line-no">056</span><span id="line-56"></span> |
| <span class="source-line-no">057</span><span id="line-57"> return delta;</span> |
| <span class="source-line-no">058</span><span id="line-58"> }</span> |
| <span class="source-line-no">059</span><span id="line-59"></span> |
| <span class="source-line-no">060</span><span id="line-60"> @Override</span> |
| <span class="source-line-no">061</span><span id="line-61"> public long getWaitInterval(long limit, long available, long amount) {</span> |
| <span class="source-line-no">062</span><span id="line-62"> if (nextRefillTime == -1) {</span> |
| <span class="source-line-no">063</span><span id="line-63"> return 0;</span> |
| <span class="source-line-no">064</span><span id="line-64"> }</span> |
| <span class="source-line-no">065</span><span id="line-65"></span> |
| <span class="source-line-no">066</span><span id="line-66"> double r = ((double) (amount - available)) * super.getTimeUnitInMillis() / limit;</span> |
| <span class="source-line-no">067</span><span id="line-67"> return (long) r;</span> |
| <span class="source-line-no">068</span><span id="line-68"> }</span> |
| <span class="source-line-no">069</span><span id="line-69"></span> |
| <span class="source-line-no">070</span><span id="line-70"> // This method is for strictly testing purpose only</span> |
| <span class="source-line-no">071</span><span id="line-71"> @Override</span> |
| <span class="source-line-no">072</span><span id="line-72"> public void setNextRefillTime(long nextRefillTime) {</span> |
| <span class="source-line-no">073</span><span id="line-73"> this.nextRefillTime = nextRefillTime;</span> |
| <span class="source-line-no">074</span><span id="line-74"> }</span> |
| <span class="source-line-no">075</span><span id="line-75"></span> |
| <span class="source-line-no">076</span><span id="line-76"> @Override</span> |
| <span class="source-line-no">077</span><span id="line-77"> public long getNextRefillTime() {</span> |
| <span class="source-line-no">078</span><span id="line-78"> return this.nextRefillTime;</span> |
| <span class="source-line-no">079</span><span id="line-79"> }</span> |
| <span class="source-line-no">080</span><span id="line-80"></span> |
| <span class="source-line-no">081</span><span id="line-81">}</span> |
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| </pre> |
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