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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.metrics;</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 java.util.Map;</span> |
| <span class="source-line-no">021</span><span id="line-21">import java.util.concurrent.ConcurrentHashMap;</span> |
| <span class="source-line-no">022</span><span id="line-22">import java.util.concurrent.TimeUnit;</span> |
| <span class="source-line-no">023</span><span id="line-23">import org.apache.hadoop.metrics2.MetricsInfo;</span> |
| <span class="source-line-no">024</span><span id="line-24">import org.apache.hadoop.metrics2.MetricsTag;</span> |
| <span class="source-line-no">025</span><span id="line-25">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">026</span><span id="line-26">import org.apache.yetus.audience.InterfaceStability;</span> |
| <span class="source-line-no">027</span><span id="line-27"></span> |
| <span class="source-line-no">028</span><span id="line-28">import org.apache.hbase.thirdparty.com.google.common.cache.CacheBuilder;</span> |
| <span class="source-line-no">029</span><span id="line-29">import org.apache.hbase.thirdparty.com.google.common.cache.CacheLoader;</span> |
| <span class="source-line-no">030</span><span id="line-30">import org.apache.hbase.thirdparty.com.google.common.cache.LoadingCache;</span> |
| <span class="source-line-no">031</span><span id="line-31"></span> |
| <span class="source-line-no">032</span><span id="line-32">/**</span> |
| <span class="source-line-no">033</span><span id="line-33"> * Helpers to create interned metrics info</span> |
| <span class="source-line-no">034</span><span id="line-34"> */</span> |
| <span class="source-line-no">035</span><span id="line-35">@InterfaceAudience.Private</span> |
| <span class="source-line-no">036</span><span id="line-36">@InterfaceStability.Evolving</span> |
| <span class="source-line-no">037</span><span id="line-37">public final class Interns {</span> |
| <span class="source-line-no">038</span><span id="line-38"></span> |
| <span class="source-line-no">039</span><span id="line-39"> private static LoadingCache<String, ConcurrentHashMap<String, MetricsInfo>> infoCache =</span> |
| <span class="source-line-no">040</span><span id="line-40"> CacheBuilder.newBuilder().expireAfterAccess(1, TimeUnit.DAYS)</span> |
| <span class="source-line-no">041</span><span id="line-41"> .build(new CacheLoader<String, ConcurrentHashMap<String, MetricsInfo>>() {</span> |
| <span class="source-line-no">042</span><span id="line-42"> @Override</span> |
| <span class="source-line-no">043</span><span id="line-43"> public ConcurrentHashMap<String, MetricsInfo> load(String key) {</span> |
| <span class="source-line-no">044</span><span id="line-44"> return new ConcurrentHashMap<>();</span> |
| <span class="source-line-no">045</span><span id="line-45"> }</span> |
| <span class="source-line-no">046</span><span id="line-46"> });</span> |
| <span class="source-line-no">047</span><span id="line-47"> private static LoadingCache<MetricsInfo, ConcurrentHashMap<String, MetricsTag>> tagCache =</span> |
| <span class="source-line-no">048</span><span id="line-48"> CacheBuilder.newBuilder().expireAfterAccess(1, TimeUnit.DAYS)</span> |
| <span class="source-line-no">049</span><span id="line-49"> .build(new CacheLoader<MetricsInfo, ConcurrentHashMap<String, MetricsTag>>() {</span> |
| <span class="source-line-no">050</span><span id="line-50"> @Override</span> |
| <span class="source-line-no">051</span><span id="line-51"> public ConcurrentHashMap<String, MetricsTag> load(MetricsInfo key) {</span> |
| <span class="source-line-no">052</span><span id="line-52"> return new ConcurrentHashMap<>();</span> |
| <span class="source-line-no">053</span><span id="line-53"> }</span> |
| <span class="source-line-no">054</span><span id="line-54"> });</span> |
| <span class="source-line-no">055</span><span id="line-55"></span> |
| <span class="source-line-no">056</span><span id="line-56"> private Interns() {</span> |
| <span class="source-line-no">057</span><span id="line-57"> }</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"> * Get a metric info object</span> |
| <span class="source-line-no">061</span><span id="line-61"> * @return an interned metric info object</span> |
| <span class="source-line-no">062</span><span id="line-62"> */</span> |
| <span class="source-line-no">063</span><span id="line-63"> public static MetricsInfo info(String name, String description) {</span> |
| <span class="source-line-no">064</span><span id="line-64"> Map<String, MetricsInfo> map = infoCache.getUnchecked(name);</span> |
| <span class="source-line-no">065</span><span id="line-65"> MetricsInfo info = map.get(description);</span> |
| <span class="source-line-no">066</span><span id="line-66"> if (info == null) {</span> |
| <span class="source-line-no">067</span><span id="line-67"> info = new MetricsInfoImpl(name, description);</span> |
| <span class="source-line-no">068</span><span id="line-68"> map.put(description, info);</span> |
| <span class="source-line-no">069</span><span id="line-69"> }</span> |
| <span class="source-line-no">070</span><span id="line-70"> return info;</span> |
| <span class="source-line-no">071</span><span id="line-71"> }</span> |
| <span class="source-line-no">072</span><span id="line-72"></span> |
| <span class="source-line-no">073</span><span id="line-73"> /**</span> |
| <span class="source-line-no">074</span><span id="line-74"> * Get a metrics tag</span> |
| <span class="source-line-no">075</span><span id="line-75"> * @param info of the tag</span> |
| <span class="source-line-no">076</span><span id="line-76"> * @param value of the tag</span> |
| <span class="source-line-no">077</span><span id="line-77"> * @return an interned metrics tag</span> |
| <span class="source-line-no">078</span><span id="line-78"> */</span> |
| <span class="source-line-no">079</span><span id="line-79"> public static MetricsTag tag(MetricsInfo info, String value) {</span> |
| <span class="source-line-no">080</span><span id="line-80"> Map<String, MetricsTag> map = tagCache.getUnchecked(info);</span> |
| <span class="source-line-no">081</span><span id="line-81"> MetricsTag tag = map.get(value);</span> |
| <span class="source-line-no">082</span><span id="line-82"> if (tag == null) {</span> |
| <span class="source-line-no">083</span><span id="line-83"> tag = new MetricsTag(info, value);</span> |
| <span class="source-line-no">084</span><span id="line-84"> map.put(value, tag);</span> |
| <span class="source-line-no">085</span><span id="line-85"> }</span> |
| <span class="source-line-no">086</span><span id="line-86"> return tag;</span> |
| <span class="source-line-no">087</span><span id="line-87"> }</span> |
| <span class="source-line-no">088</span><span id="line-88"></span> |
| <span class="source-line-no">089</span><span id="line-89"> /**</span> |
| <span class="source-line-no">090</span><span id="line-90"> * Get a metrics tag</span> |
| <span class="source-line-no">091</span><span id="line-91"> * @param name of the tag</span> |
| <span class="source-line-no">092</span><span id="line-92"> * @param description of the tag</span> |
| <span class="source-line-no">093</span><span id="line-93"> * @param value of the tag</span> |
| <span class="source-line-no">094</span><span id="line-94"> * @return an interned metrics tag</span> |
| <span class="source-line-no">095</span><span id="line-95"> */</span> |
| <span class="source-line-no">096</span><span id="line-96"> public static MetricsTag tag(String name, String description, String value) {</span> |
| <span class="source-line-no">097</span><span id="line-97"> return tag(info(name, description), value);</span> |
| <span class="source-line-no">098</span><span id="line-98"> }</span> |
| <span class="source-line-no">099</span><span id="line-99">}</span> |
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| </pre> |
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