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docs/krontab/describing/krontabscheduler.html
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Custom scheduler
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<h1 id="krontabscheduler">KrontabScheduler<a class="headerlink" href="#krontabscheduler" title="Permanent link">&para;</a></h1>
<p><code>KronScheduler</code> is the simple interface with only one function <code>next</code>. This function optionally get as a parameter <code>DateTime</code> which will be used as start point for the calculation of next trigger time. This function will return the next <code>DateTime</code> when something must happen.</p>
<h3 id="default-realisation">Default realisation<a class="headerlink" href="#default-realisation" title="Permanent link">&para;</a></h3>
<p>Default realisation (<code>CronDateTimeScheduler</code>) can be created using several ways:</p>
<ul>
<li>Via <code>buildSchedule</code> (or <code>createSimpleScheduler</code>) functions with crontab-like syntax parameter</li>
<li>Via <code>buildSchedule</code> (or <code>SchedulerBuilder</code> object), which using lambda to configure scheduler</li>
</ul>
<p>In the examples below the result of created scheduler will be the same.</p>
<h4 id="crontab-like-way">Crontab-like way<a class="headerlink" href="#crontab-like-way" title="Permanent link">&para;</a></h4>
<div class="admonition note">
<p class="admonition-title">Crontab-like syntax</p>
<p>
See <a href="string-format.html">String format</a> for more info about the crontab-line syntax</p>
</div>
<p>This way will be very useful for cases when you need to configure something via external configuration (from file on startup or via some parameter from requests, for example):</p>
<pre><code class="language-kotlin">val schedule = &quot;5 * * * *&quot;
val scheduler = buildSchedule(schedule)
scheduler.asFlow().onEach {
// this block will be called every minute at 5 seconds
}.launchIn(someCoroutineScope)
</code></pre>
<h4 id="lambda-way">Lambda way<a class="headerlink" href="#lambda-way" title="Permanent link">&para;</a></h4>
<p>In case of usage builder (lets call it <code>lambda way</code>), you will be able to configure scheduler in more type-safe way:</p>
<pre><code class="language-kotlin">val scheduler = buildSchedule {
seconds {
at(5)
}
}
scheduler.asFlow().onEach {
// this block will be called every minute at 5 seconds
}.launchIn(someCoroutineScope)
</code></pre>
<h3 id="custom-scheduler">Custom scheduler<a class="headerlink" href="#custom-scheduler" title="Permanent link">&para;</a></h3>
<p>You are always able to use your own realisation of scheduler. For example:</p>
<pre><code class="language-kotlin">class RandomScheduler : KronScheduler {
override suspend fun next(relatively: DateTime): DateTime {
return relatively + DateTimeSpan(seconds = Random.nextInt() % 60)
}
}
</code></pre>
<p>In the example above we have created <code>RandomScheduler</code>, which will return random next time in range <code>0-60</code> seconds since <code>relatively</code> argument.</p>
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