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<h2 id="write-your-first-gearpump-application">Write your first Gearpump Application</h2>
<p>We'll use the classical <a href="https://github.com/apache/incubator-gearpump/tree/master/examples/streaming/wordcount/src/main/scala/org/apache/gearpump/streaming/examples/wordcount">wordcount</a> example to illustrate how to write Gearpump applications.</p>
<pre class="codehilite"><code class="language-scala">/** WordCount with High level DSL */
object WordCount extends AkkaApp with ArgumentsParser {
override val options: Array[(String, CLIOption[Any])] = Array.empty
override def main(akkaConf: Config, args: Array[String]): Unit = {
val context = ClientContext(akkaConf)
val app = StreamApp(&quot;dsl&quot;, context)
val data = &quot;This is a good start, bingo!! bingo!!&quot;
//count for each word and output to log
app.source(data.lines.toList, 1, &quot;source&quot;).
// word =&gt; (word, count)
flatMap(line =&gt; line.split(&quot;[\\s]+&quot;)).map((_, 1)).
// (word, count1), (word, count2) =&gt; (word, count1 + count2)
groupByKey().sum.log
context.submit(app).waitUntilFinish()
context.close()
}
}</code></pre>
<p>The example is written in our <a href="http://gearpump.apache.org/releases/latest/api/scala/index.html#org.apache.gearpump.streaming.dsl.Stream">Stream DSL</a>, which provides you with convenient combinators (e.g. <code>flatMap</code>, <code>groupByKey</code>) to easily write up transformations.</p>
<h3 id="ide-setup-optional">IDE Setup (Optional)</h3>
<p>You can get your preferred IDE ready for Gearpump by following <a href="../dev-ide-setup">this guide</a>.</p>
<h3 id="submit-application">Submit application</h3>
<p>Finally, you need to package everything into a uber jar with <a href="http://gearpump.apache.org/downloads.html#maven-dependencies">proper dependencies</a> and submit it to a Gearpump cluster. Please check out the <a href="../../introduction/commandline">application submission tool</a>.</p>
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