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Main parts of Behaviour Builder
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<h1 id="behaviour-builder">Behaviour Builder<a class="headerlink" href="#behaviour-builder" title="Permanent link">&para;</a></h1>
<p>In the previous pages about <a href="https://bookstack.inmo.dev/books/telegrambotapi/page/updates-with-flows">updates handling</a> and was mentioned that currently in the most cases you should use <a href="https://kotlinlang.org/docs/flow.html">Flow</a>s. So, there is an improvement for that system which hide direct work with flows and allow you to create more declarative logic of your bot.</p>
<h2 id="main-parts-of-behaviour-builder">Main parts of Behaviour Builder<a class="headerlink" href="#main-parts-of-behaviour-builder" title="Permanent link">&para;</a></h2>
<p>There are several things you should know for better understanding of behaviour builder:</p>
<ul>
<li><a href="https://github.com/InsanusMokrassar/TelegramBotAPI/blob/master/tgbotapi.behaviour_builder/src/commonMain/kotlin/dev/inmo/tgbotapi/extensions/behaviour_builder/BehaviourContext.kt#L33">BehaviourContext</a> - it is the thing which contains all necessary tools for working with bots</li>
<li><a href="https://tgbotapi.inmo.dev/docs/dev.inmo.tgbotapi.extensions.behaviour_builder.triggers_handling/index.html">Triggers</a> - <code>on*</code> extensions for <code>BehaviourContext</code> which allow you to create reaction on some update</li>
<li><a href="https://tgbotapi.inmo.dev/docs/dev.inmo.tgbotapi.extensions.behaviour_builder.expectations/index.html">Expectations</a> (or waiters) - <code>wait*</code> extensions which you <strong>may</strong> use in <a href="https://tgbotapi.inmo.dev/docs/dev.inmo.tgbotapi.extensions.behaviour_builder/build-behaviour.html">buildBehaviour</a> function, but <strong><em>it is recommended</em></strong> to use it in bodies of triggers</li>
</ul>
<h2 id="initialization">Initialization<a class="headerlink" href="#initialization" title="Permanent link">&para;</a></h2>
<p>As was said above, there is <a href="https://tgbotapi.inmo.dev/docs/dev.inmo.tgbotapi.extensions.behaviour_builder/build-behaviour.html">buildBehaviour</a> function which allow you set up your bot logic. Let&rsquo;s see an example:</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="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-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a>
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a><span class="n">bot</span><span class="p">.</span><span class="na">buildBehaviour</span><span class="w"> </span><span class="p">{</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">onCommand</span><span class="p">(</span><span class="s">&quot;start&quot;</span><span class="p">)</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="c1">// creating of trigger</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="kd">val</span><span class="w"> </span><span class="nv">message</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">it</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="kd">val</span><span class="w"> </span><span class="nv">content</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">message</span><span class="p">.</span><span class="na">content</span>
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a>
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="w"> </span><span class="n">reply</span><span class="p">(</span><span class="n">message</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;Ok, send me one photo&quot;</span><span class="p">)</span><span class="w"> </span><span class="c1">// send text message with replying on incoming message</span>
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a>
</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="w"> </span><span class="kd">val</span><span class="w"> </span><span class="nv">photoContent</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">waitPhoto</span><span class="p">().</span><span class="na">first</span><span class="p">()</span><span class="w"> </span><span class="c1">// waitPhoto will return List, so, get first element</span>
</span><span id="__span-0-11"><a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a>
</span><span id="__span-0-12"><a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a><span class="w"> </span><span class="kd">val</span><span class="w"> </span><span class="nv">photo</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">downloadFile</span><span class="p">(</span><span class="n">photoContent</span><span class="p">)</span><span class="w"> </span><span class="c1">// ByteArray of photo</span>
</span><span id="__span-0-13"><a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a>
</span><span id="__span-0-14"><a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a><span class="w"> </span><span class="c1">// some logic with saving of photos</span>
</span><span id="__span-0-15"><a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-0-16"><a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a><span class="p">}</span>
</span></code></pre></div>
<h2 id="filters">Filters<a class="headerlink" href="#filters" title="Permanent link">&para;</a></h2>
<p>In most cases there are opportunity to filter some of messages before starting of main logic. Let&rsquo;s look at this using the example above:</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">buildBehaviour</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">onCommand</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="s">&quot;start&quot;</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="n">initialFilter</span><span class="w"> </span><span class="o">=</span><span class="w"> </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="w"> </span><span class="nb">it</span><span class="p">.</span><span class="na">content</span><span class="p">.</span><span class="na">textSources</span><span class="p">.</span><span class="na">size</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="m">1</span><span class="w"> </span><span class="c1">// make sure that user has sent /start without any additions</span>
</span><span id="__span-1-8"><a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-1-9"><a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a><span class="w"> </span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-1-10"><a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a><span class="w"> </span><span class="c1">// ...</span>
</span><span id="__span-1-11"><a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-1-12"><a id="__codelineno-1-12" name="__codelineno-1-12" href="#__codelineno-1-12"></a><span class="p">}</span>
</span></code></pre></div>
<p>OR</p>
<div class="language-kotlin highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></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-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a>
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="n">bot</span><span class="p">.</span><span class="na">buildBehaviour</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="w"> </span><span class="n">onCommand</span><span class="p">(</span>
</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="w"> </span><span class="s">&quot;start&quot;</span><span class="p">,</span>
</span><span id="__span-2-6"><a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a><span class="w"> </span><span class="n">requireOnlyCommandInMessage</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="kc">true</span><span class="w"> </span><span class="c1">// it is default, but you can overwrite it with `requireOnlyCommandInMessage = false`</span>
</span><span id="__span-2-7"><a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a><span class="w"> </span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
</span><span id="__span-2-8"><a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a><span class="w"> </span><span class="c1">// ...</span>
</span><span id="__span-2-9"><a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a><span class="w"> </span><span class="p">}</span>
</span><span id="__span-2-10"><a id="__codelineno-2-10" name="__codelineno-2-10" href="#__codelineno-2-10"></a><span class="p">}</span>
</span></code></pre></div>
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