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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">¶</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">¶</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’s look how it works with the factory above:</p>
<pre><code class="language-kotlin">// Step 1 - create filter
val filter = flowsUpdatesFilter {
// Step 2 - set up handling. In this case we will print any message from group or user in console
messageFlow.onEach {
println(it)
}.launchIn(someCoroutineScope)
}
// Step 3 - passing updates to filter
bot.getUpdates().forEach {
filter.asUpdatesReceiver(it)
}
</code></pre>
<h2 id="long-polling">Long polling<a class="headerlink" href="#long-polling" title="Permanent link">¶</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>
<pre><code class="language-kotlin">val bot = telegramBot("TOKEN")
bot.longPolling {
messageFlow.onEach {
println(it)
}.launchIn(someCoroutineScope)
}.join()
</code></pre>
<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">¶</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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