docs/tgbotapi/logic/behaviour-builder-with-fsm.html
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<h1 id="behaviour-builder-with-fsm">Behaviour Builder with FSM<a class="headerlink" href="#behaviour-builder-with-fsm" title="Permanent link">&para;</a></h1>
<p>Behaviour builder with FSM is based on the MicroUtils FSM. There are several important things in FSM:</p>
<ul>
<li><code>State</code> - any object which implements <a href="https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.fsm.common/-state/index.html">State</a> interface</li>
<li><code>StateHandler</code> (or <a href="https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.fsm.common/-checkable-handler-holder/index.html">CheckableHandlerHolder</a>) - the handler of states</li>
<li><a href="https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.fsm.common/-states-machine/index.html">StatesMachine</a> - some machine which work with states and handlers</li>
<li><a href="https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.fsm.common/-states-manager/index.html">StatesManager</a> - simple manager that will solve which states to save and notify about states changes via its flows</li>
</ul>
<p><code>StatesMachine</code> have two methods:</p>
<ul>
<li><code>start</code> which will start work of machine</li>
<li><code>startChain</code> which will add new state for handling</li>
</ul>
<p>The most based way to create <code>StatesMachine</code> and register <code>StateHandler</code>s looks like in the next snippet:</p>
<pre><code class="language-kotlin">buildFSM&lt;TrafficLightState&gt; {
strictlyOn&lt;SomeState&gt; {
// state handling
}
}.start(CoroutineScope(...)).join()
</code></pre>
<div class="admonition note">
<p class="admonition-title">Full example</p>
<p>
You may find full example of FSM usage in <a href="https://github.com/InsanusMokrassar/MicroUtils/blob/master/fsm/common/src/jvmTest/kotlin/PlayableMain.kt">the tests of FSM in MicroUtils</a></p>
</div>
<p>So, you must do next steps before you will launch your bot with FSM:</p>
<ul>
<li>Create your states. Remember that you may plan to save them, so it is likely you will need to serialize it there</li>
<li>Create your handlers for your states. In most cases it is useful to use <a href="https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.fsm.common/-checkable-handler-holder/index.html">CheckableHandlerHolder</a> if you want to use standard states machine</li>
<li>Solve which states managers to use (the most simple one is the <a href="https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.fsm.common.managers/-default-states-manager/index.html">DefaultStatesManager</a> with <a href="https://microutils.inmo.dev/micro_utils.dokka/dev.inmo.micro_utils.fsm.common.managers/-in-memory-default-states-manager-repo/index.html">InMemoryDefaultStatesManager</a>)</li>
</ul>
<h2 id="bot-with-fsm">Bot with FSM<a class="headerlink" href="#bot-with-fsm" title="Permanent link">&para;</a></h2>
<p>There are several extensions for <code>TelegramBot</code> to create your bot with FSM:</p>
<ul>
<li><a href="https://tgbotapi.inmo.dev/docs/dev.inmo.tgbotapi.extensions.behaviour_builder/build-behaviour-with-f-s-m.html">buildBehaviourWithFSM</a><ul>
<li><a href="https://tgbotapi.inmo.dev/docs/dev.inmo.tgbotapi.extensions.behaviour_builder/build-behaviour-with-f-s-m-and-start-long-polling.html">buildBehaviourWithFSMAndStartLongPolling</a></li>
</ul>
</li>
<li><a href="https://tgbotapi.inmo.dev/docs/dev.inmo.tgbotapi.extensions.behaviour_builder/telegram-bot-with-behaviour-and-f-s-m.html">telegramBotWithBehaviourAndFSM</a><ul>
<li><a href="https://tgbotapi.inmo.dev/docs/dev.inmo.tgbotapi.extensions.behaviour_builder/telegram-bot-with-behaviour-and-f-s-m-and-start-long-polling.html">telegramBotWithBehaviourAndFSMAndStartLongPolling
</a></li>
</ul>
</li>
</ul>
<p>All of them will take as an callback some object with type <a href="https://tgbotapi.inmo.dev/docs/dev.inmo.tgbotapi.extensions.behaviour_builder/index.html#-1892390839%2FClasslikes%2F-1982836883">CustomBehaviourContextReceiver</a> and will looks like in the next snippet:</p>
<pre><code class="language-kotlin">telegramBotWithBehaviourAndFSMAndStartLongPolling&lt;YourStateType&gt;(&quot;BOT_TOKEN&quot;) {
// here you may use any operations from BehaviourBuilder
// here you may use any operations from BehaviourContextWithFSMBuilder like strictlyOn and others
}
</code></pre>
<h2 id="examples">Examples<a class="headerlink" href="#examples" title="Permanent link">&para;</a></h2>
<ul>
<li><a href="https://github.com/InsanusMokrassar/TelegramBotAPI-examples/blob/master/FSMBot/src/main/kotlin/SimpleFSMBot.kt">TelegramBotAPI-examples/FSMBot</a></li>
<li><a href="https://github.com/InsanusMokrassar/MicroUtils/blob/master/fsm/common/src/jvmTest/kotlin/PlayableMain.kt">MicroUtils simple example in the tests</a></li>
</ul>
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