assets/Programming-Kafka.html-e74e5c8f.js

import{_ as t,r as p,o as e,c as o,a as c,d as n,e as s,b as u,f as l}from"./app-5cdcb249.js";const i={},k=n("h1",{id:"kafka",tabindex:"-1"},[n("a",{class:"header-anchor",href:"#kafka","aria-hidden":"true"},"#"),s(" Kafka")],-1),r={href:"https://kafka.apache.org/",target:"_blank",rel:"noopener noreferrer"},d=l(`<h2 id="coding-example" tabindex="-1"><a class="header-anchor" href="#coding-example" aria-hidden="true">#</a> Coding Example</h2><h3 id="kafka-producer-producing-data-java-code-example" tabindex="-1"><a class="header-anchor" href="#kafka-producer-producing-data-java-code-example" aria-hidden="true">#</a> kafka Producer Producing Data Java Code Example</h3><div class="language-java line-numbers-mode" data-ext="java"><pre class="language-java"><code>    <span class="token class-name">Properties</span> props <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Properties</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    props<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token string">&quot;bootstrap.servers&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;127.0.0.1:9092&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    props<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token string">&quot;key.serializer&quot;</span><span class="token punctuation">,</span> <span class="token class-name">StringSerializer</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    props<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token string">&quot;value.serializer&quot;</span><span class="token punctuation">,</span> <span class="token class-name">StringSerializer</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">KafkaProducer</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> producer <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">KafkaProducer</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span>props<span class="token punctuation">)</span><span class="token punctuation">;</span>
    producer<span class="token punctuation">.</span><span class="token function">send</span><span class="token punctuation">(</span>
        <span class="token keyword">new</span> <span class="token class-name">ProducerRecord</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span>
            <span class="token string">&quot;Kafka-Test&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;key&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;root.kafka,&quot;</span> <span class="token operator">+</span> <span class="token class-name">System</span><span class="token punctuation">.</span><span class="token function">currentTimeMillis</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">&quot;,value,INT32,100&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    producer<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="kafka-consumer-receiving-data-java-code-example" tabindex="-1"><a class="header-anchor" href="#kafka-consumer-receiving-data-java-code-example" aria-hidden="true">#</a> kafka Consumer Receiving Data Java Code Example</h3><div class="language-java line-numbers-mode" data-ext="java"><pre class="language-java"><code>    <span class="token class-name">Properties</span> props <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Properties</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    props<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token string">&quot;bootstrap.servers&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;127.0.0.1:9092&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    props<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token string">&quot;key.deserializer&quot;</span><span class="token punctuation">,</span> <span class="token class-name">StringDeserializer</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    props<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token string">&quot;value.deserializer&quot;</span><span class="token punctuation">,</span> <span class="token class-name">StringDeserializer</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    props<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token string">&quot;auto.offset.reset&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;earliest&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    props<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token string">&quot;group.id&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;Kafka-Test&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">KafkaConsumer</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> kafkaConsumer <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">KafkaConsumer</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span>props<span class="token punctuation">)</span><span class="token punctuation">;</span>
    kafkaConsumer<span class="token punctuation">.</span><span class="token function">subscribe</span><span class="token punctuation">(</span><span class="token class-name">Collections</span><span class="token punctuation">.</span><span class="token function">singleton</span><span class="token punctuation">(</span><span class="token string">&quot;Kafka-Test&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">ConsumerRecords</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> records <span class="token operator">=</span> kafkaConsumer<span class="token punctuation">.</span><span class="token function">poll</span><span class="token punctuation">(</span><span class="token class-name">Duration</span><span class="token punctuation">.</span><span class="token function">ofSeconds</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h3 id="example-of-java-code-stored-in-iotdb-server" tabindex="-1"><a class="header-anchor" href="#example-of-java-code-stored-in-iotdb-server" aria-hidden="true">#</a> Example of Java Code Stored in IoTDB Server</h3><div class="language-java line-numbers-mode" data-ext="java"><pre class="language-java"><code>    <span class="token class-name">SessionPool</span> pool <span class="token operator">=</span>
        <span class="token keyword">new</span> <span class="token class-name">SessionPool<span class="token punctuation">.</span>Builder</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
            <span class="token punctuation">.</span><span class="token function">host</span><span class="token punctuation">(</span><span class="token string">&quot;127.0.0.1&quot;</span><span class="token punctuation">)</span>
            <span class="token punctuation">.</span><span class="token function">port</span><span class="token punctuation">(</span><span class="token number">6667</span><span class="token punctuation">)</span>
            <span class="token punctuation">.</span><span class="token function">user</span><span class="token punctuation">(</span><span class="token string">&quot;root&quot;</span><span class="token punctuation">)</span>
            <span class="token punctuation">.</span><span class="token function">password</span><span class="token punctuation">(</span><span class="token string">&quot;root&quot;</span><span class="token punctuation">)</span>
            <span class="token punctuation">.</span><span class="token function">maxSize</span><span class="token punctuation">(</span><span class="token number">3</span><span class="token punctuation">)</span>
            <span class="token punctuation">.</span><span class="token function">build</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> datas <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ArrayList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span>records<span class="token punctuation">.</span><span class="token function">count</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token class-name">ConsumerRecord</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> record <span class="token operator">:</span> records<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      datas<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>record<span class="token punctuation">.</span><span class="token function">value</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    <span class="token keyword">int</span> size <span class="token operator">=</span> datas<span class="token punctuation">.</span><span class="token function">size</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> deviceIds <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ArrayList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span>size<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Long</span><span class="token punctuation">&gt;</span></span> times <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ArrayList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span>size<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">List</span><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> measurementsList <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ArrayList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span>size<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">List</span><span class="token punctuation">&lt;</span><span class="token class-name">TSDataType</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> typesList <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ArrayList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span>size<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">List</span><span class="token punctuation">&lt;</span><span class="token class-name">Object</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> valuesList <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ArrayList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span>size<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token class-name">String</span> data <span class="token operator">:</span> datas<span class="token punctuation">)</span> <span class="token punctuation">{</span>
      <span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> dataArray <span class="token operator">=</span> data<span class="token punctuation">.</span><span class="token function">split</span><span class="token punctuation">(</span><span class="token string">&quot;,&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token class-name">String</span> device <span class="token operator">=</span> dataArray<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
      <span class="token keyword">long</span> time <span class="token operator">=</span> <span class="token class-name">Long</span><span class="token punctuation">.</span><span class="token function">parseLong</span><span class="token punctuation">(</span>dataArray<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> measurements <span class="token operator">=</span> <span class="token class-name">Arrays</span><span class="token punctuation">.</span><span class="token function">asList</span><span class="token punctuation">(</span>dataArray<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">split</span><span class="token punctuation">(</span><span class="token string">&quot;:&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">TSDataType</span><span class="token punctuation">&gt;</span></span> types <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ArrayList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token class-name">String</span> type <span class="token operator">:</span> dataArray<span class="token punctuation">[</span><span class="token number">3</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">split</span><span class="token punctuation">(</span><span class="token string">&quot;:&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        types<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token class-name">TSDataType</span><span class="token punctuation">.</span><span class="token function">valueOf</span><span class="token punctuation">(</span>type<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token punctuation">}</span>
      <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Object</span><span class="token punctuation">&gt;</span></span> values <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ArrayList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> valuesStr <span class="token operator">=</span> dataArray<span class="token punctuation">[</span><span class="token number">4</span><span class="token punctuation">]</span><span class="token punctuation">.</span><span class="token function">split</span><span class="token punctuation">(</span><span class="token string">&quot;:&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator">&lt;</span> valuesStr<span class="token punctuation">.</span>length<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">switch</span> <span class="token punctuation">(</span>types<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>i<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
          <span class="token keyword">case</span> <span class="token constant">INT64</span><span class="token operator">:</span>
            values<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token class-name">Long</span><span class="token punctuation">.</span><span class="token function">parseLong</span><span class="token punctuation">(</span>valuesStr<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">break</span><span class="token punctuation">;</span>
          <span class="token keyword">case</span> <span class="token constant">DOUBLE</span><span class="token operator">:</span>
            values<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token class-name">Double</span><span class="token punctuation">.</span><span class="token function">parseDouble</span><span class="token punctuation">(</span>valuesStr<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">break</span><span class="token punctuation">;</span>
          <span class="token keyword">case</span> <span class="token constant">INT32</span><span class="token operator">:</span>
            values<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token class-name">Integer</span><span class="token punctuation">.</span><span class="token function">parseInt</span><span class="token punctuation">(</span>valuesStr<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">break</span><span class="token punctuation">;</span>
          <span class="token keyword">case</span> <span class="token constant">TEXT</span><span class="token operator">:</span>
            values<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>valuesStr<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">break</span><span class="token punctuation">;</span>
          <span class="token keyword">case</span> <span class="token constant">FLOAT</span><span class="token operator">:</span>
            values<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token class-name">Float</span><span class="token punctuation">.</span><span class="token function">parseFloat</span><span class="token punctuation">(</span>valuesStr<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">break</span><span class="token punctuation">;</span>
          <span class="token keyword">case</span> <span class="token constant">BOOLEAN</span><span class="token operator">:</span>
            values<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token class-name">Boolean</span><span class="token punctuation">.</span><span class="token function">parseBoolean</span><span class="token punctuation">(</span>valuesStr<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">break</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
      <span class="token punctuation">}</span>
      deviceIds<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>device<span class="token punctuation">)</span><span class="token punctuation">;</span>
      times<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>time<span class="token punctuation">)</span><span class="token punctuation">;</span>
      measurementsList<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>measurements<span class="token punctuation">)</span><span class="token punctuation">;</span>
      typesList<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>types<span class="token punctuation">)</span><span class="token punctuation">;</span>
      valuesList<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>values<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    pool<span class="token punctuation">.</span><span class="token function">insertRecords</span><span class="token punctuation">(</span>deviceIds<span class="token punctuation">,</span> times<span class="token punctuation">,</span> measurementsList<span class="token punctuation">,</span> typesList<span class="token punctuation">,</span> valuesList<span class="token punctuation">)</span><span class="token punctuation">;</span>
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