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<div class="subTitle">org.apache.gearpump.streaming.dsl</div>
<h2 title="Class Stream" class="title">Class Stream&lt;T&gt;</h2>
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<pre>public class <span class="typeNameLabel">Stream&lt;T&gt;</span>
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<td class="colFirst"><code>static &lt;T&gt;&nbsp;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="class in org.apache.gearpump.streaming.dsl">Stream</a>&lt;T&gt;</code></td>
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<td class="colFirst"><code><a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="class in org.apache.gearpump.streaming.dsl">Stream</a>&lt;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;</code></td>
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java.lang.String&nbsp;description)</code>
<div class="block">Keeps records when fun(T) == true</div>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>&lt;R&gt;&nbsp;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="class in org.apache.gearpump.streaming.dsl">Stream</a>&lt;R&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html#flatMap-scala.Function1-java.lang.String-">flatMap</a></span>(scala.Function1&lt;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>,scala.collection.TraversableOnce&lt;R&gt;&gt;&nbsp;fun,
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<div class="block">converts a value[T] to a list of value[R]</div>
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<td class="colFirst"><code>static &lt;K,V&gt;&nbsp;K</code></td>
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<td class="colFirst"><code>&lt;Group&gt;&nbsp;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="class in org.apache.gearpump.streaming.dsl">Stream</a>&lt;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html#groupBy-scala.Function1-int-java.lang.String-">groupBy</a></span>(scala.Function1&lt;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>,Group&gt;&nbsp;fun,
int&nbsp;parallelism,
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<div class="block">Group by function (T =&gt; Group)</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html#log--">log</a></span>()</code>
<div class="block">Log to task log file</div>
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<td class="colFirst"><code>&lt;R&gt;&nbsp;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="class in org.apache.gearpump.streaming.dsl">Stream</a>&lt;R&gt;</code></td>
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java.lang.String&nbsp;description)</code>
<div class="block">Maps message of type T message of type R</div>
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<td class="colFirst"><code><a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="class in org.apache.gearpump.streaming.dsl">Stream</a>&lt;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html#merge-org.apache.gearpump.streaming.dsl.Stream-java.lang.String-">merge</a></span>(<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="class in org.apache.gearpump.streaming.dsl">Stream</a>&lt;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;other,
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<td class="colFirst"><code>&lt;R&gt;&nbsp;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="class in org.apache.gearpump.streaming.dsl">Stream</a>&lt;R&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html#process-java.lang.Class-int-org.apache.gearpump.cluster.UserConfig-java.lang.String-">process</a></span>(java.lang.Class&lt;? extends <a href="../../../../../org/apache/gearpump/streaming/task/Task.html" title="class in org.apache.gearpump.streaming.task">Task</a>&gt;&nbsp;processor,
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<td class="colFirst"><code><a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="class in org.apache.gearpump.streaming.dsl">Stream</a>&lt;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;</code></td>
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<td class="colFirst"><code>static &lt;K,V&gt;&nbsp;<a href="../../../../../org/apache/gearpump/streaming/dsl/KVStream.html" title="class in org.apache.gearpump.streaming.dsl">KVStream</a>&lt;K,V&gt;</code></td>
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<td class="colFirst"><code>static &lt;K,V&gt;&nbsp;scala.Function2&lt;scala.Tuple2&lt;K,V&gt;,scala.Tuple2&lt;K,V&gt;,scala.Tuple2&lt;K,V&gt;&gt;</code></td>
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<pre>public static&nbsp;&lt;K,V&gt;&nbsp;K&nbsp;getTupleKey(scala.Tuple2&lt;K,V&gt;&nbsp;tuple)</pre>
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<pre>public static&nbsp;&lt;K,V&gt;&nbsp;scala.Function2&lt;scala.Tuple2&lt;K,V&gt;,scala.Tuple2&lt;K,V&gt;,scala.Tuple2&lt;K,V&gt;&gt;&nbsp;sumByKey(scala.math.Numeric&lt;V&gt;&nbsp;numeric)</pre>
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<pre>public&nbsp;&lt;R&gt;&nbsp;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="class in org.apache.gearpump.streaming.dsl">Stream</a>&lt;R&gt;&nbsp;flatMap(scala.Function1&lt;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>,scala.collection.TraversableOnce&lt;R&gt;&gt;&nbsp;fun,
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<div class="block">converts a value[T] to a list of value[R]
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>fun</code> - FlatMap function</dd>
<dd><code>description</code> - The description message for this operation</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A new stream with type [R]</dd>
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<div class="block">Maps message of type T message of type R
<p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>fun</code> - Function</dd>
<dd><code>description</code> - (undocumented)</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A new stream with type [R]</dd>
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<pre>public&nbsp;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="class in org.apache.gearpump.streaming.dsl">Stream</a>&lt;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;filter(scala.Function1&lt;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>,java.lang.Object&gt;&nbsp;fun,
java.lang.String&nbsp;description)</pre>
<div class="block">Keeps records when fun(T) == true
<p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>fun</code> - the filter</dd>
<dd><code>description</code> - (undocumented)</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a new stream after filter</dd>
</dl>
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<h4>reduce</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="class in org.apache.gearpump.streaming.dsl">Stream</a>&lt;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;reduce(scala.Function2&lt;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>,<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>,<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;fun,
java.lang.String&nbsp;description)</pre>
<div class="block">Reduces operations.
<p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>fun</code> - reduction function</dd>
<dd><code>description</code> - description message for this operator</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a new stream after reduction</dd>
</dl>
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<h4>log</h4>
<pre>public&nbsp;void&nbsp;log()</pre>
<div class="block">Log to task log file</div>
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<h4>merge</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="class in org.apache.gearpump.streaming.dsl">Stream</a>&lt;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;merge(<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="class in org.apache.gearpump.streaming.dsl">Stream</a>&lt;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;other,
java.lang.String&nbsp;description)</pre>
<div class="block">Merges data from two stream into one
<p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>other</code> - the other stream</dd>
<dd><code>description</code> - (undocumented)</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the merged stream</dd>
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<pre>public&nbsp;&lt;Group&gt;&nbsp;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="class in org.apache.gearpump.streaming.dsl">Stream</a>&lt;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;groupBy(scala.Function1&lt;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>,Group&gt;&nbsp;fun,
int&nbsp;parallelism,
java.lang.String&nbsp;description)</pre>
<div class="block">Group by function (T =&gt; Group)
<p>
For example, we have T type, People(name: String, gender: String, age: Int)
groupBy[People](_.gender) will group the people by gender.
<p>
You can append other combinators after groupBy
<p>
For example,
<pre><code>
Stream[People].groupBy(_.gender).flatmap(..).filter.(..).reduce(..)
</code></pre>
<p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>fun</code> - Group by function</dd>
<dd><code>parallelism</code> - Parallelism level</dd>
<dd><code>description</code> - The description</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the grouped stream</dd>
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<pre>public&nbsp;&lt;R&gt;&nbsp;<a href="../../../../../org/apache/gearpump/streaming/dsl/Stream.html" title="class in org.apache.gearpump.streaming.dsl">Stream</a>&lt;R&gt;&nbsp;process(java.lang.Class&lt;? extends <a href="../../../../../org/apache/gearpump/streaming/task/Task.html" title="class in org.apache.gearpump.streaming.task">Task</a>&gt;&nbsp;processor,
int&nbsp;parallelism,
<a href="../../../../../org/apache/gearpump/cluster/UserConfig.html" title="class in org.apache.gearpump.cluster">UserConfig</a>&nbsp;conf,
java.lang.String&nbsp;description)</pre>
<div class="block">Connects with a low level Processor(TaskDescription)
<p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>processor</code> - a user defined processor</dd>
<dd><code>parallelism</code> - parallelism level</dd>
<dd><code>conf</code> - (undocumented)</dd>
<dd><code>description</code> - (undocumented)</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>new stream after processing with type [R]</dd>
</dl>
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