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<a href="#phylosophy-of-flow-updates-retrieving" class="md-nav__link">
Phylosophy of Flow updates retrieving
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<a href="#long-polling" class="md-nav__link">
Long polling
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Results and What is next?
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<h1 id="updates-with-flows">Updates with flows<a class="headerlink" href="#updates-with-flows" title="Permanent link">&para;</a></h1>
<p>Of course, in most cases here we will look up the way of using <a href="https://github.com/InsanusMokrassar/TelegramBotAPI/tree/master/tgbotapi.utils/">utils extnsions</a>, but you may read deeper about updates retrieving <a href="https://bookstack.inmo.dev/books/telegrambotapi/chapter/updates-retrieving">here</a>.</p>
<h2 id="phylosophy-of-flow-updates-retrieving">Phylosophy of <code>Flow</code> updates retrieving<a class="headerlink" href="#phylosophy-of-flow-updates-retrieving" title="Permanent link">&para;</a></h2>
<p>In most updates retrieving processes there are two components: <a href="https://github.com/InsanusMokrassar/TelegramBotAPI/blob/master/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/updateshandlers/UpdatesFilter.kt">UpdatesFiler</a> and its inheritor <a href="https://github.com/InsanusMokrassar/TelegramBotAPI/blob/master/tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/updateshandlers/FlowsUpdatesFilter.kt#L12">FlowsUpdatesFilter</a>. It is assumed, that you will do several things in your app to handle updates:</p>
<ul>
<li>Create your <code>UpdatesFilter</code> (for example, with <a href="https://tgbotapi.inmo.dev/docs/dev.inmo.tgbotapi.extensions.utils.updates/flows-updates-filter.html">flowsUpdatesFilter</a> factory)</li>
<li>Set it up (in case of <code>flowsUpdatesFilter</code> you will set up updates handling in the lambda passed to this factory)</li>
<li>Provide updates to this filter with <a href="https://tgbotapi.inmo.dev/docs/dev.inmo.tgbotapi.updateshandlers/-updates-filter/as-update-receiver.html">filter#asUpdateReceiver</a> object</li>
</ul>
<p>Let&rsquo;s look how it works with the factory above:</p>
<div class="language-kotlin highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="c1">// Step 1 - create filter</span>
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="kd">val</span><span class="w"> </span><span class="nv">filter</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">flowsUpdatesFilter</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="w"> </span><span class="c1">// Step 2 - set up handling. In this case we will print any message from group or user in console</span>
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="w"> </span><span class="n">messageFlow</span><span class="p">.</span><span class="na">onEach</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="w"> </span><span class="n">println</span><span class="p">(</span><span class="nb">it</span><span class="p">)</span>
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="w"> </span><span class="p">}.</span><span class="na">launchIn</span><span class="p">(</span><span class="n">someCoroutineScope</span><span class="p">)</span>
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a><span class="p">}</span>
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a>
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a><span class="c1">// Step 3 - passing updates to filter</span>
</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="n">bot</span><span class="p">.</span><span class="na">getUpdates</span><span class="p">().</span><span class="na">forEach</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-0-11"><a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a><span class="w"> </span><span class="n">filter</span><span class="p">.</span><span class="na">asUpdatesReceiver</span><span class="p">(</span><span class="nb">it</span><span class="p">)</span>
</span><span id="__span-0-12"><a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a><span class="p">}</span>
</span></code></pre></div>
<h2 id="long-polling">Long polling<a class="headerlink" href="#long-polling" title="Permanent link">&para;</a></h2>
<p>Some example with long polling has been described above. But it is more useful to use some factories for it. In this page we will look for simple variant with <a href="https://tgbotapi.inmo.dev/docs/dev.inmo.tgbotapi.extensions.utils.updates.retrieving/long-polling.html">TelegramBot#longPolling</a>. So, with this function, your handling of updates will looks like:</p>
<div class="language-kotlin highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="kd">val</span><span class="w"> </span><span class="nv">bot</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">telegramBot</span><span class="p">(</span><span class="s">&quot;TOKEN&quot;</span><span class="p">)</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="n">bot</span><span class="p">.</span><span class="na">longPolling</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="w"> </span><span class="n">messageFlow</span><span class="p">.</span><span class="na">onEach</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="w"> </span><span class="n">println</span><span class="p">(</span><span class="nb">it</span><span class="p">)</span>
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="w"> </span><span class="p">}.</span><span class="na">launchIn</span><span class="p">(</span><span class="n">someCoroutineScope</span><span class="p">)</span>
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a><span class="p">}.</span><span class="na">join</span><span class="p">()</span>
</span></code></pre></div>
<p>This example looks like the example above with three steps, but there are several important things here:</p>
<ul>
<li>You <strong>do not</strong> manage retrieving of updates by hands</li>
<li><code>.join()</code> will suspend your function 😊 <code>longPolling</code> function returns <code>Job</code> and you may use it to:</li>
<li><code>cancel</code> working of long polling (just call <code>job.cancel()</code>)</li>
<li><code>join</code> and wait while the work of <code>longPolling</code> will not be completed (it will works infinity if you will not cancel it anywhere)</li>
<li><a href="https://tgbotapi.inmo.dev/docs/dev.inmo.tgbotapi.updateshandlers/-flows-updates-filter/index.html">FlowsUpdatesFilter</a> has been created under the hood of <code>longPolling</code> function</li>
</ul>
<h2 id="results-and-what-is-next">Results and <code>What is next?</code><a class="headerlink" href="#results-and-what-is-next" title="Permanent link">&para;</a></h2>
<p>As a result you can start listen updates and react on it. Next recommended articles:</p>
<ul>
<li><a href="https://bookstack.inmo.dev/books/telegrambotapi/page/behaviour-builder">Behaviour Builder</a> as a variant of asynchronous handling of your bot logic</li>
<li><a href="https://bookstack.inmo.dev/books/telegrambotapi/page/behaviour-builder-with-fsm">FSM variant of Behaviour Builder</a></li>
</ul>
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