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xmlns="http://www.w3.org/2000/svg" class="icon print-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="print icon"><path d="M819.2 364.8h-44.8V128c0-17.067-14.933-32-32-32H281.6c-17.067 0-32 14.933-32 32v236.8h-44.8C145.067 364.8 96 413.867 96 473.6v192c0 59.733 49.067 108.8 108.8 108.8h44.8V896c0 17.067 14.933 32 32 32h460.8c17.067 0 32-14.933 32-32V774.4h44.8c59.733 0 108.8-49.067 108.8-108.8v-192c0-59.733-49.067-108.8-108.8-108.8zM313.6 160h396.8v204.8H313.6V160zm396.8 704H313.6V620.8h396.8V864zM864 665.6c0 25.6-19.2 44.8-44.8 44.8h-44.8V588.8c0-17.067-14.933-32-32-32H281.6c-17.067 0-32 14.933-32 32v121.6h-44.8c-25.6 0-44.8-19.2-44.8-44.8v-192c0-25.6 19.2-44.8 44.8-44.8h614.4c25.6 0 44.8 19.2 44.8 44.8v192z"></path></svg></button><div class="arrow end"></div></div><div class="vp-toc-wrapper"><ul class="vp-toc-list"><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#java">Java</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#c-c">C/C++</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#python">Python</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#go">Go</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#rust">Rust</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#node-js">Node.JS</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#c">C#</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#websocket-方式订阅">WebSocket 方式订阅</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#mqtt-方式订阅">MQTT 方式订阅</a></li><!----><!--]--><!--[--><li class="vp-toc-item"><a class="route-link vp-toc-link level2" href="#数据过滤">数据过滤</a></li><!----><!--]--></ul><div class="vp-toc-marker" style="top:-1.7rem;"></div></div><!--[--><!----><!--]--></aside></div><!--[--><!----><!--]--><div class="theme-hope-content"><h1 id="iotdb-数据订阅客户端" tabindex="-1"><a class="header-anchor" href="#iotdb-数据订阅客户端"><span>IoTDB 数据订阅客户端</span></a></h1><p><strong>IoTDB 的数据订阅客户端能够从特定的 IoTDB 集群内，按照一定的方式获取数据。</strong><br> 我们提供了多语言的 api，能够实时获取 IoTDB 内的最新数据，且具有推送和拉取两种模式。下面将按照语言顺序列出这些 api。</p><h2 id="java" tabindex="-1"><a class="header-anchor" href="#java"><span>Java</span></a></h2><p>提供 SubscriptionFactory 构造消费者，支持 PushConsumer 和 PullConsumer 两种消费风格：</p><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token keyword">interface</span> <span class="token class-name">SubscriptionFactory</span> <span class="token punctuation">{</span>

     <span class="token class-name">PushConsumer</span> <span class="token function">createPushConsumer</span><span class="token punctuation">(</span><span class="token class-name">SubscriptionConfiguration</span> subscriptionConfiguration<span class="token punctuation">)</span>
             <span class="token keyword">throws</span> <span class="token class-name">SubscriptionException</span><span class="token punctuation">;</span>

     <span class="token class-name">PullConsumer</span> <span class="token function">createPullConsumer</span><span class="token punctuation">(</span><span class="token class-name">SubscriptionConfiguration</span> subscriptionConfiguration<span class="token punctuation">)</span>
             <span class="token keyword">throws</span> <span class="token class-name">SubscriptionException</span><span class="token punctuation">;</span>
 <span class="token punctuation">}</span>

 <span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">PushConsumer</span> <span class="token keyword">implements</span> <span class="token class-name">Consumer</span> <span class="token punctuation">{</span>
     <span class="token comment">// 唤醒</span>
     <span class="token keyword">void</span> <span class="token function">resumeConsume</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
     <span class="token comment">// 暂停</span>
     <span class="token keyword">void</span> <span class="token function">pauseConsume</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
     <span class="token comment">// 是否暂停</span>
     <span class="token keyword">boolean</span> <span class="token function">isConsumePaused</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

     <span class="token comment">// 订阅消息到达后的回调 Listener</span>
     <span class="token class-name">PushConsumer</span> <span class="token function">registerSubscriptionListener</span><span class="token punctuation">(</span><span class="token class-name">SubscriptionListener</span> listener<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SubscriptionException</span><span class="token punctuation">;</span>
     <span class="token comment">// 错误出现后的回调 Listener</span>
     <span class="token class-name">PushConsumer</span> <span class="token function">registerErrorListener</span><span class="token punctuation">(</span><span class="token class-name">ReceiveErrorListener</span> listener<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SubscriptionException</span><span class="token punctuation">;</span>

     <span class="token keyword">void</span> <span class="token function">close</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">public</span> <span class="token keyword">class</span> <span class="token class-name">PullConsumer</span> <span class="token keyword">implements</span> <span class="token class-name">Consumer</span> <span class="token punctuation">{</span>
     <span class="token comment">// 获取队列顶部消息，客户端自己循环调用。比如：consumer.poll(Duration.ofMillis(100))</span>
     <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">ConsumerDataSet</span><span class="token punctuation">&gt;</span></span> <span class="token function">poll</span><span class="token punctuation">(</span><span class="token class-name">Duration</span> timeout<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">SubscriptionException</span><span class="token punctuation">;</span>

     <span class="token keyword">void</span> <span class="token function">openSubscription</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

     <span class="token keyword">void</span> <span class="token function">close</span><span class="token punctuation">(</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 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 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 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><h2 id="c-c" tabindex="-1"><a class="header-anchor" href="#c-c"><span>C/C++</span></a></h2><p>IoTDB 提供与 Java 类似的订阅接口：</p><div class="language-C line-numbers-mode" data-ext="C" data-title="C"><pre class="language-C"><code>push_consumer * iotdb_create_push_consumer(subscription_config *cnf);
 pull_consumer * iotdb_create_pull_consumer(subscription_config *cnf);

 int push_consumer_resume(push_consumer *pc);
 int push_consumer_pause(push_consumer *pc);
 int push_consumer_is_consume_paused(push_consumer *pc);
 int push_consumer_register_subscription_listener(push_consumer *pc, SUBSCRIPTION_LISTENER listener);
 int push_consumer_register_error_listener(push_consumer *pc, SERROR_LISTENER listener);
 int push_consumer_close(push_consumer *pc);

 consumer_dataset * pull_consumer_poll(pull_consumer *pc, int64_t timeout);
 int pull_consumer_open(pull_consumer *pc);
 int pull_consumer_close(pull_consumer *pc);
 </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 class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="python" tabindex="-1"><a class="header-anchor" href="#python"><span>Python</span></a></h2><p>Python 的订阅接口与 Java 的类似，订阅方式如下：</p><div class="language-python line-numbers-mode" data-ext="py" data-title="py"><pre class="language-python"><code><span class="token keyword">from</span> abc <span class="token keyword">import</span> ABC<span class="token punctuation">,</span> abstractmethod
 <span class="token keyword">from</span> typing <span class="token keyword">import</span> List
 <span class="token keyword">from</span> datetime <span class="token keyword">import</span> timedelta

 <span class="token keyword">class</span> <span class="token class-name">SubscriptionFactory</span><span class="token punctuation">(</span>ABC<span class="token punctuation">)</span><span class="token punctuation">:</span>
     <span class="token decorator annotation punctuation">@abstractmethod</span>
     <span class="token keyword">def</span> <span class="token function">createPushConsumer</span><span class="token punctuation">(</span>self<span class="token punctuation">,</span> subscriptionConfiguration<span class="token punctuation">)</span><span class="token punctuation">:</span>
         <span class="token keyword">pass</span>

     <span class="token decorator annotation punctuation">@abstractmethod</span>
     <span class="token keyword">def</span> <span class="token function">createPullConsumer</span><span class="token punctuation">(</span>self<span class="token punctuation">,</span> subscriptionConfiguration<span class="token punctuation">)</span><span class="token punctuation">:</span>
         <span class="token keyword">pass</span>


 <span class="token keyword">class</span> <span class="token class-name">PushConsumer</span><span class="token punctuation">:</span>
     <span class="token keyword">def</span> <span class="token function">resumeConsume</span><span class="token punctuation">(</span>self<span class="token punctuation">)</span><span class="token punctuation">:</span>
         <span class="token keyword">pass</span>

     <span class="token keyword">def</span> <span class="token function">pauseConsume</span><span class="token punctuation">(</span>self<span class="token punctuation">)</span><span class="token punctuation">:</span>
         <span class="token keyword">pass</span>

     <span class="token keyword">def</span> <span class="token function">isConsumePaused</span><span class="token punctuation">(</span>self<span class="token punctuation">)</span><span class="token punctuation">:</span>
         <span class="token keyword">pass</span>

     <span class="token keyword">def</span> <span class="token function">registerSubscriptionListener</span><span class="token punctuation">(</span>self<span class="token punctuation">,</span> listener<span class="token punctuation">)</span><span class="token punctuation">:</span>
         <span class="token keyword">pass</span>

     <span class="token keyword">def</span> <span class="token function">registerErrorListener</span><span class="token punctuation">(</span>self<span class="token punctuation">,</span> listener<span class="token punctuation">)</span><span class="token punctuation">:</span>
         <span class="token keyword">pass</span>

     <span class="token keyword">def</span> <span class="token function">close</span><span class="token punctuation">(</span>self<span class="token punctuation">)</span><span class="token punctuation">:</span>
         <span class="token keyword">pass</span>


 <span class="token keyword">class</span> <span class="token class-name">PullConsumer</span><span class="token punctuation">:</span>
     <span class="token keyword">def</span> <span class="token function">poll</span><span class="token punctuation">(</span>self<span class="token punctuation">,</span> timeout<span class="token punctuation">:</span> timedelta<span class="token punctuation">)</span> <span class="token operator">-</span><span class="token operator">&gt;</span> List<span class="token punctuation">:</span>
         <span class="token keyword">pass</span>

     <span class="token keyword">def</span> <span class="token function">openSubscription</span><span class="token punctuation">(</span>self<span class="token punctuation">)</span><span class="token punctuation">:</span>
         <span class="token keyword">pass</span>

     <span class="token keyword">def</span> <span class="token function">close</span><span class="token punctuation">(</span>self<span class="token punctuation">)</span><span class="token punctuation">:</span>
         <span class="token keyword">pass</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 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 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 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 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><h2 id="go" tabindex="-1"><a class="header-anchor" href="#go"><span>Go</span></a></h2><p>Go 语言内的订阅方式如下：</p><div class="language-go line-numbers-mode" data-ext="go" data-title="go"><pre class="language-go"><code><span class="token keyword">package</span> main

 <span class="token keyword">import</span> <span class="token punctuation">(</span>
 \t<span class="token string">&quot;time&quot;</span>
 <span class="token punctuation">)</span>

 <span class="token keyword">type</span> SubscriptionFactory <span class="token keyword">interface</span> <span class="token punctuation">{</span>
 \<span class="token function">tCreatePushConsumer</span><span class="token punctuation">(</span>subscriptionConfiguration SubscriptionConfiguration<span class="token punctuation">)</span> <span class="token punctuation">(</span>PushConsumer<span class="token punctuation">,</span> <span class="token builtin">error</span><span class="token punctuation">)</span>
 \<span class="token function">tCreatePullConsumer</span><span class="token punctuation">(</span>subscriptionConfiguration SubscriptionConfiguration<span class="token punctuation">)</span> <span class="token punctuation">(</span>PullConsumer<span class="token punctuation">,</span> <span class="token builtin">error</span><span class="token punctuation">)</span>
 <span class="token punctuation">}</span>

 <span class="token keyword">type</span> PushConsumer <span class="token keyword">interface</span> <span class="token punctuation">{</span>
 \<span class="token function">tResumeConsume</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
 \<span class="token function">tPauseConsume</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
 \<span class="token function">tIsConsumePaused</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token builtin">bool</span>
 \<span class="token function">tRegisterSubscriptionListener</span><span class="token punctuation">(</span>listener SubscriptionListener<span class="token punctuation">)</span> <span class="token builtin">error</span>
 \<span class="token function">tRegisterErrorListener</span><span class="token punctuation">(</span>listener ReceiveErrorListener<span class="token punctuation">)</span> <span class="token builtin">error</span>
 \<span class="token function">tClose</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
 <span class="token punctuation">}</span>

 <span class="token keyword">type</span> PullConsumer <span class="token keyword">interface</span> <span class="token punctuation">{</span>
 \<span class="token function">tPoll</span><span class="token punctuation">(</span>timeout time<span class="token punctuation">.</span>Duration<span class="token punctuation">)</span> <span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token punctuation">]</span>ConsumerDataSet<span class="token punctuation">,</span> <span class="token builtin">error</span><span class="token punctuation">)</span>
 \<span class="token function">tOpenSubscription</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
 \<span class="token function">tClose</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
 <span class="token punctuation">}</span>

 <span class="token keyword">type</span> ConsumerDataSet <span class="token keyword">struct</span> <span class="token punctuation">{</span>
 \t<span class="token comment">// define fields of ConsumerDataSet</span>
 <span class="token punctuation">}</span>

 <span class="token keyword">type</span> SubscriptionConfiguration <span class="token keyword">struct</span> <span class="token punctuation">{</span>
 \t<span class="token comment">// define fields of SubscriptionConfiguration</span>
 <span class="token punctuation">}</span>

 <span class="token keyword">type</span> SubscriptionListener <span class="token keyword">interface</span> <span class="token punctuation">{</span>
 \t<span class="token comment">// define methods of SubscriptionListener</span>
 <span class="token punctuation">}</span>

 <span class="token keyword">type</span> ReceiveErrorListener <span class="token keyword">interface</span> <span class="token punctuation">{</span>
 \t<span class="token comment">// define methods of ReceiveErrorListener</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 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 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 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 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><h2 id="rust" tabindex="-1"><a class="header-anchor" href="#rust"><span>Rust</span></a></h2><p>Rust 语言内的订阅方式如下：</p><div class="language-rust line-numbers-mode" data-ext="rs" data-title="rs"><pre class="language-rust"><code><span class="token keyword">use</span> <span class="token namespace">std<span class="token punctuation">::</span>time<span class="token punctuation">::</span></span><span class="token class-name">Duration</span><span class="token punctuation">;</span>

 <span class="token keyword">pub</span> <span class="token keyword">trait</span> <span class="token type-definition class-name">SubscriptionFactory</span> <span class="token punctuation">{</span>
     <span class="token keyword">fn</span> <span class="token function-definition function">create_push_consumer</span><span class="token punctuation">(</span><span class="token operator">&amp;</span><span class="token keyword">self</span><span class="token punctuation">,</span> subscription_configuration<span class="token punctuation">:</span> <span class="token class-name">SubscriptionConfiguration</span><span class="token punctuation">)</span>
         <span class="token punctuation">-&gt;</span> <span class="token class-name">Result</span><span class="token operator">&lt;</span><span class="token class-name">PushConsumer</span><span class="token punctuation">,</span> <span class="token class-name">SubscriptionException</span><span class="token operator">&gt;</span><span class="token punctuation">;</span>

     <span class="token keyword">fn</span> <span class="token function-definition function">create_pull_consumer</span><span class="token punctuation">(</span><span class="token operator">&amp;</span><span class="token keyword">self</span><span class="token punctuation">,</span> subscription_configuration<span class="token punctuation">:</span> <span class="token class-name">SubscriptionConfiguration</span><span class="token punctuation">)</span>
         <span class="token punctuation">-&gt;</span> <span class="token class-name">Result</span><span class="token operator">&lt;</span><span class="token class-name">PullConsumer</span><span class="token punctuation">,</span> <span class="token class-name">SubscriptionException</span><span class="token operator">&gt;</span><span class="token punctuation">;</span>
 <span class="token punctuation">}</span>

 <span class="token keyword">pub</span> <span class="token keyword">struct</span> <span class="token type-definition class-name">PushConsumer</span> <span class="token punctuation">{</span>
     <span class="token comment">// 唤醒</span>
     <span class="token keyword">fn</span> <span class="token function-definition function">resume_consume</span><span class="token punctuation">(</span><span class="token operator">&amp;</span><span class="token keyword">self</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

     <span class="token comment">// 暂停</span>
     <span class="token keyword">fn</span> <span class="token function-definition function">pause_consume</span><span class="token punctuation">(</span><span class="token operator">&amp;</span><span class="token keyword">self</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

     <span class="token comment">// 是否暂停</span>
     <span class="token keyword">fn</span> <span class="token function-definition function">is_consume_paused</span><span class="token punctuation">(</span><span class="token operator">&amp;</span><span class="token keyword">self</span><span class="token punctuation">)</span> <span class="token punctuation">-&gt;</span> <span class="token keyword">bool</span><span class="token punctuation">;</span>

     <span class="token comment">// 订阅消息到达后的回调 Listener</span>
     <span class="token keyword">fn</span> <span class="token function-definition function">register_subscription_listener</span><span class="token punctuation">(</span><span class="token operator">&amp;</span><span class="token keyword">self</span><span class="token punctuation">,</span> listener<span class="token punctuation">:</span> <span class="token class-name">SubscriptionListener</span><span class="token punctuation">)</span>
         <span class="token punctuation">-&gt;</span> <span class="token class-name">Result</span><span class="token operator">&lt;</span><span class="token class-name">PushConsumer</span><span class="token punctuation">,</span> <span class="token class-name">SubscriptionException</span><span class="token operator">&gt;</span><span class="token punctuation">;</span>

     <span class="token comment">// 错误出现后的回调 Listener</span>
     <span class="token keyword">fn</span> <span class="token function-definition function">register_error_listener</span><span class="token punctuation">(</span><span class="token operator">&amp;</span><span class="token keyword">self</span><span class="token punctuation">,</span> listener<span class="token punctuation">:</span> <span class="token class-name">ReceiveErrorListener</span><span class="token punctuation">)</span>
         <span class="token punctuation">-&gt;</span> <span class="token class-name">Result</span><span class="token operator">&lt;</span><span class="token class-name">PushConsumer</span><span class="token punctuation">,</span> <span class="token class-name">SubscriptionException</span><span class="token operator">&gt;</span><span class="token punctuation">;</span>

     <span class="token keyword">fn</span> <span class="token function-definition function">close</span><span class="token punctuation">(</span><span class="token operator">&amp;</span><span class="token keyword">self</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
 <span class="token punctuation">}</span>

 <span class="token keyword">pub</span> <span class="token keyword">struct</span> <span class="token type-definition class-name">PullConsumer</span> <span class="token punctuation">{</span>
     <span class="token comment">// 获取队列顶部消息，客户端自己循环调用。比如：consumer.poll(Duration::from_millis(100))</span>
     <span class="token keyword">fn</span> <span class="token function-definition function">poll</span><span class="token punctuation">(</span><span class="token operator">&amp;</span><span class="token keyword">self</span><span class="token punctuation">,</span> timeout<span class="token punctuation">:</span> <span class="token class-name">Duration</span><span class="token punctuation">)</span> <span class="token punctuation">-&gt;</span> <span class="token class-name">Result</span><span class="token operator">&lt;</span><span class="token class-name">Vec</span><span class="token operator">&lt;</span><span class="token class-name">ConsumerDataSet</span><span class="token operator">&gt;</span><span class="token punctuation">,</span> <span class="token class-name">SubscriptionException</span><span class="token operator">&gt;</span><span class="token punctuation">;</span>

     <span class="token keyword">fn</span> <span class="token function-definition function">openSubscription</span><span class="token punctuation">(</span><span class="token operator">&amp;</span><span class="token keyword">self</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

     <span class="token keyword">fn</span> <span class="token function-definition function">close</span><span class="token punctuation">(</span><span class="token operator">&amp;</span><span class="token keyword">self</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 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 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 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 class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="node-js" tabindex="-1"><a class="header-anchor" href="#node-js"><span>Node.JS</span></a></h2><div class="language-javascript line-numbers-mode" data-ext="js" data-title="js"><pre class="language-javascript"><code><span class="token keyword">class</span> <span class="token class-name">PushConsumer</span> <span class="token punctuation">{</span>
   <span class="token function">constructor</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
     <span class="token keyword">this</span><span class="token punctuation">.</span>paused <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
     <span class="token keyword">this</span><span class="token punctuation">.</span>subscriptionListener <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
     <span class="token keyword">this</span><span class="token punctuation">.</span>errorListener <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
   <span class="token punctuation">}</span>

   <span class="token function">resumeConsume</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
     <span class="token keyword">this</span><span class="token punctuation">.</span>paused <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
   <span class="token punctuation">}</span>

   <span class="token function">pauseConsume</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
     <span class="token keyword">this</span><span class="token punctuation">.</span>paused <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
   <span class="token punctuation">}</span>

   <span class="token function">isConsumePaused</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
     <span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">.</span>paused<span class="token punctuation">;</span>
   <span class="token punctuation">}</span>

   <span class="token function">registerSubscriptionListener</span><span class="token punctuation">(</span><span class="token parameter">listener</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
     <span class="token keyword">this</span><span class="token punctuation">.</span>subscriptionListener <span class="token operator">=</span> listener<span class="token punctuation">;</span>
     <span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">;</span>
   <span class="token punctuation">}</span>

   <span class="token function">registerErrorListener</span><span class="token punctuation">(</span><span class="token parameter">listener</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
     <span class="token keyword">this</span><span class="token punctuation">.</span>errorListener <span class="token operator">=</span> listener<span class="token punctuation">;</span>
     <span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">;</span>
   <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>
     <span class="token comment">// 关闭操作</span>
   <span class="token punctuation">}</span>
 <span class="token punctuation">}</span>

 <span class="token keyword">class</span> <span class="token class-name">PullConsumer</span> <span class="token punctuation">{</span>
   <span class="token function">poll</span><span class="token punctuation">(</span><span class="token parameter">timeout</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
     <span class="token comment">// 获取队列顶部消息的操作</span>
     <span class="token keyword">return</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
   <span class="token punctuation">}</span>

   <span class="token function">openSubscription</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
     <span class="token comment">// 打开连接</span>
   <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>
     <span class="token comment">// 关闭操作</span>
   <span class="token punctuation">}</span>
 <span class="token punctuation">}</span>

 <span class="token keyword">class</span> <span class="token class-name">SubscriptionFactory</span> <span class="token punctuation">{</span>
   <span class="token function">createPushConsumer</span><span class="token punctuation">(</span><span class="token parameter">subscriptionConfiguration</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
     <span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">PushConsumer</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
   <span class="token punctuation">}</span>

   <span class="token function">createPullConsumer</span><span class="token punctuation">(</span><span class="token parameter">subscriptionConfiguration</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
     <span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">PullConsumer</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>

 module<span class="token punctuation">.</span>exports <span class="token operator">=</span> <span class="token punctuation">{</span>
   SubscriptionFactory<span class="token punctuation">,</span>
   PushConsumer<span class="token punctuation">,</span>
   PullConsumer
 <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 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 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 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 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 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 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 class="line-number"></div></div></div><p>使用方式示例：</p><div class="language-javascript line-numbers-mode" data-ext="js" data-title="js"><pre class="language-javascript"><code><span class="token keyword">const</span> <span class="token punctuation">{</span> SubscriptionFactory <span class="token punctuation">}</span> <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">&#39;./subscription&#39;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

 <span class="token keyword">const</span> factory <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">SubscriptionFactory</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
 <span class="token keyword">const</span> subscriptionConfiguration <span class="token operator">=</span> <span class="token punctuation">{</span> <span class="token comment">/* 配置信息 */</span> <span class="token punctuation">}</span><span class="token punctuation">;</span>

 <span class="token keyword">const</span> pushConsumer <span class="token operator">=</span> factory<span class="token punctuation">.</span><span class="token function">createPushConsumer</span><span class="token punctuation">(</span>subscriptionConfiguration<span class="token punctuation">)</span><span class="token punctuation">;</span>
 pushConsumer<span class="token punctuation">.</span><span class="token function">registerSubscriptionListener</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">message</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
   <span class="token comment">// 处理订阅消息到达后的逻辑</span>
 <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">registerErrorListener</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">error</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
   <span class="token comment">// 处理错误出现后的逻辑</span>
 <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

 <span class="token keyword">const</span> pullConsumer <span class="token operator">=</span> factory<span class="token punctuation">.</span><span class="token function">createPullConsumer</span><span class="token punctuation">(</span>subscriptionConfiguration<span class="token punctuation">)</span><span class="token punctuation">;</span>

 <span class="token comment">// 使用 pushConsumer 和 pullConsumer 进行操作</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 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><h2 id="c" tabindex="-1"><a class="header-anchor" href="#c"><span>C#</span></a></h2><div class="language-C# line-numbers-mode" data-ext="C#" data-title="C#"><pre class="language-C#"><code>public interface SubscriptionFactory
 {
     PushConsumer CreatePushConsumer(SubscriptionConfiguration subscriptionConfiguration)
     {
         throw new SubscriptionException();
     }

     PullConsumer CreatePullConsumer(SubscriptionConfiguration subscriptionConfiguration)
     {
         throw new SubscriptionException();
     }
 }

 public class PushConsumer : Consumer
 {
     public void ResumeConsume()
     {
         // 唤醒逻辑
     }

     public void PauseConsume()
     {
         // 暂停逻辑
     }

     public bool IsConsumePaused()
     {
         // 判断是否暂停逻辑
     }

     public PushConsumer RegisterSubscriptionListener(SubscriptionListener listener)
     {
         throw new SubscriptionException();
     }

     public PushConsumer RegisterErrorListener(ReceiveErrorListener listener)
     {
         throw new SubscriptionException();
     }

     public void Close()
     {
         // 关闭逻辑
     }
 }

 public class PullConsumer : Consumer
 {
     public List&lt;ConsumerDataSet&gt; Poll(TimeSpan timeout)
     {
         throw new SubscriptionException();
     }

     public void OpenSubscription()
     {
         // 开始逻辑
     }

     public void Close()
     {
         // 关闭逻辑
     }
 }
 </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 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 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 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 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 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 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><h2 id="websocket-方式订阅" tabindex="-1"><a class="header-anchor" href="#websocket-方式订阅"><span>WebSocket 方式订阅</span></a></h2><p>同时，IoTDB 的订阅客户端还支持以 WebSocket 的方式订阅。 WebSocket 的默认客户端端口为 9090，也可以在客户端内配置。订阅消息为：</p><div class="language-json line-numbers-mode" data-ext="json" data-title="json"><pre class="language-json"><code> <span class="token punctuation">{</span>
   <span class="token property">&quot;event&quot;</span><span class="token operator">:</span> <span class="token string">&quot;subscribe&quot;</span><span class="token punctuation">,</span>
   <span class="token property">&quot;pattern&quot;</span><span class="token operator">:</span> <span class="token string">&quot;root&quot;</span><span class="token punctuation">,</span>
   <span class="token property">&quot;unordered&quot;</span><span class="token operator">:</span> <span class="token string">&quot;false&quot;</span><span class="token punctuation">,</span>
   <span class="token property">&quot;timeRange&quot;</span><span class="token operator">:</span> <span class="token string">&quot;...&quot;</span><span class="token punctuation">,</span>
   <span class="token property">&quot;ValueRange&quot;</span><span class="token operator">:</span> <span class="token string">&quot;&gt;100&quot;</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></div><p>该消息将订阅 IoTDB 的所有数据，不包括乱序数据，按照一定时间进行过滤，同时只需要大于100的数据。</p><p>此外，还需要自定义 socket.onmessage 函数，以处理获取到的数据。此外，还需要编写 socket.onclose 和 socket.onerror 等函数，以自定义客户端对这些事件的响应。</p><h2 id="mqtt-方式订阅" tabindex="-1"><a class="header-anchor" href="#mqtt-方式订阅"><span>MQTT 方式订阅</span></a></h2><p>目前 IoTDB 的 MQTT 方式支持数据订阅功能，其数据格式与 WebSocket 相同。mqtt 的 host 和 port 需要在 iotdb 的 properties 文件内配置。</p><h2 id="数据过滤" tabindex="-1"><a class="header-anchor" href="#数据过滤"><span>数据过滤</span></a></h2><p>与数据同步软件相同，IoTDB 的订阅功能也可以提供数据过滤的功能。WebSocket 与 MQTT 方式已经给出了示例。<br> Api 方式下，以 Java 订阅接口为例子，用户可在 SubscriptionConfiguration 中配置过滤条件（Strategy）。目前支持指定的条件包括：</p><ul><li>是否需要过滤乱序数据（disorderHandlingStrategy）</li><li>需要订阅的序列的共同前缀（topicsStrategy）</li><li>指定序列的时间范围（timeStrategy）</li><li>指定序列的值范围（valueStrategy）</li></ul><div class="language-java line-numbers-mode" data-ext="java" data-title="java"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">PushConsumerExample</span> <span class="token punctuation">{</span>

    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">test</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">Throwable</span> <span class="token punctuation">{</span>
        <span class="token class-name">SubscriptionConfiguration</span> config <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">SubscriptionConfiguration<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">group</span><span class="token punctuation">(</span><span class="token string">&quot;my-test-group&quot;</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 comment">// 在此设置过滤条件</span>
        config<span class="token punctuation">.</span><span class="token function">disorderHandlingStrategy</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">IntolerableStrategy</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
              <span class="token punctuation">.</span><span class="token function">topicsStrategy</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">SingleTopicStrategy</span><span class="token punctuation">(</span><span class="token string">&quot;root.sg.d1.n1&quot;</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
              <span class="token punctuation">.</span><span class="token function">timeStrategy</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">GlobalTimeStrategy</span><span class="token punctuation">)</span>
              <span class="token punctuation">.</span><span class="token function">valueStrategy</span><span class="token punctuation">(</span><span class="token class-name">ValueStrategy<span class="token punctuation">.</span>GreaterThanStrategy</span><span class="token punctuation">(</span>
                  <span class="token keyword">new</span> <span class="token class-name">SingleTopicStrategy</span><span class="token punctuation">(</span><span class="token string">&quot;root.sg.d1.n1&quot;</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token number">100d</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token class-name">SubscriptionFactory</span> factory <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">SubscriptionFactory</span><span class="token punctuation">(</span>config<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">final</span> <span class="token class-name">PullConsumer</span> pullConsumer <span class="token operator">=</span> factory<span class="token punctuation">.</span><span class="token function">createPullConsumer</span><span class="token punctuation">(</span>consumerConfig<span class="token punctuation">)</span><span class="token punctuation">;</span>
        pullConsumer<span class="token punctuation">.</span><span class="token function">openSubscription</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token boolean">true</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">ConsumerDataSet</span><span class="token punctuation">&gt;</span></span> result <span class="token operator">=</span> pullConsumer<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">ofMillis</span><span class="token punctuation">(</span><span class="token number">300</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">ConsumerDataSet</span> item <span class="token operator">:</span> result<span class="token punctuation">)</span> <span class="token punctuation">{</span>
                     <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">&quot;received message : &quot;</span> <span class="token operator">+</span> item<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 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 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 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 class="line-number"></div><div class="line-number"></div></div></div></div><!--[--><!----><!--]--><footer class="vp-page-meta"><div class="vp-meta-item edit-link"><a href="https://github.com/apache/iotdb-docs/edit/main/src/zh/UserGuide/V1.2.x/User-Manual/Subscription_timecho.md" rel="noopener noreferrer" target="_blank" aria-label="发现错误？在 GitHub 上编辑此页" class="nav-link vp-meta-label"><!--[--><svg xmlns="http://www.w3.org/2000/svg" class="icon edit-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="edit icon"><path d="M430.818 653.65a60.46 60.46 0 0 1-50.96-93.281l71.69-114.012 7.773-10.365L816.038 80.138A60.46 60.46 0 0 1 859.225 62a60.46 60.46 0 0 1 43.186 18.138l43.186 43.186a60.46 60.46 0 0 1 0 86.373L588.879 565.55l-8.637 8.637-117.466 68.234a60.46 60.46 0 0 1-31.958 11.229z"></path><path d="M728.802 962H252.891A190.883 190.883 0 0 1 62.008 771.98V296.934a190.883 190.883 0 0 1 190.883-192.61h267.754a60.46 60.46 0 0 1 0 120.92H252.891a69.962 69.962 0 0 0-69.098 69.099V771.98a69.962 69.962 0 0 0 69.098 69.098h475.911A69.962 69.962 0 0 0 797.9 771.98V503.363a60.46 60.46 0 1 1 120.922 0V771.98A190.883 190.883 0 0 1 728.802 962z"></path></svg><!--]-->发现错误？在 GitHub 上编辑此页<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span><!----></a></div><div class="vp-meta-item git-info"><div class="update-time"><span class="vp-meta-label">上次编辑于: </span><!----></div><!----></div></footer><!----><!----><!--[--><!----><!--]--><!--]--></main><!--]--><footer style="padding-bottom:2rem;"><span id="doc-version" style="display:none;">rel/1.2</span><p style="text-align:center;color:#909399;font-size:12px;margin:0 30px;">Copyright © 2024 The Apache Software Foundation.<br> Apache and the Apache feather logo are trademarks of The Apache Software Foundation</p><p style="text-align:center;margin-top:10px;color:#909399;font-size:12px;margin:0 30px;"><strong>Have a question?</strong> Connect with us on QQ, WeChat, or Slack. <a href="https://github.com/apache/iotdb/issues/1995">Join the community</a> now.</p></footer></div><!--]--><!--]--><!--[--><!----><!--]--><!--]--></div>
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