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class="vp-sidebar-title">参考</span><span class="vp-arrow end"></span></button><!----></section></li></ul><!--[--><!----><!--]--></aside><!--[--><main id="main-content" class="vp-page"><!--[--><!--[--><!----><!--]--><!----><nav class="vp-breadcrumb disable"></nav><div class="vp-page-title"><h1><!---->IoTDB 数据订阅客户端</h1><div class="page-info"><!----><!----><span class="page-date-info" aria-label="写作日期"><svg xmlns="http://www.w3.org/2000/svg" class="icon calendar-icon" viewBox="0 0 1024 1024" fill="currentColor" aria-label="calendar icon"><path d="M716.4 110.137c0-18.753-14.72-33.473-33.472-33.473-18.753 0-33.473 14.72-33.473 33.473v33.473h66.993v-33.473zm-334.87 0c0-18.753-14.72-33.473-33.473-33.473s-33.52 14.72-33.52 33.473v33.473h66.993v-33.473zm468.81 33.52H716.4v100.465c0 18.753-14.72 33.473-33.472 33.473a33.145 33.145 0 01-33.473-33.473V143.657H381.53v100.465c0 18.753-14.72 33.473-33.473 33.473a33.145 33.145 0 01-33.473-33.473V143.657H180.6A134.314 134.314 0 0046.66 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--><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" aria-hidden="true">#</a> IoTDB 数据订阅客户端</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" aria-hidden="true">#</a> Java</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"><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" aria-hidden="true">#</a> C/C++</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"><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" aria-hidden="true">#</a> Python</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"><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" aria-hidden="true">#</a> Go</h2><p>Go 语言内的订阅方式如下：</p><div class="language-go line-numbers-mode" data-ext="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" aria-hidden="true">#</a> Rust</h2><p>Rust 语言内的订阅方式如下：</p><div class="language-rust line-numbers-mode" data-ext="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" aria-hidden="true">#</a> Node.JS</h2><div class="language-javascript line-numbers-mode" data-ext="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"><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" aria-hidden="true">#</a> C#</h2><div class="language-C# line-numbers-mode" data-ext="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" aria-hidden="true">#</a> WebSocket 方式订阅</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"><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" aria-hidden="true">#</a> MQTT 方式订阅</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" aria-hidden="true">#</a> 数据过滤</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"><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="page-meta"><div class="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 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="meta-item git-info"><div class="update-time"><span class="label">上次编辑于: </span><!----></div><div class="contributors"><span class="label">贡献者: </span><!--[--><!--[--><span class="contributor" title="email: 105700158+wanghui42@users.noreply.github.com">wanghui42</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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