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<div class="subTitle">io.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>
extends java.lang.Object</pre>
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<td class="colFirst"><code>static class&nbsp;</code></td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../io/gearpump/streaming/dsl/Stream.html#Stream-io.gearpump.util.Graph-io.gearpump.streaming.dsl.op.Op-scala.Option-scala.reflect.ClassTag-">Stream</a></span>(io.gearpump.util.Graph&lt;<a href="../../../../io/gearpump/streaming/dsl/op/Op.html" title="interface in io.gearpump.streaming.dsl.op">Op</a>,<a href="../../../../io/gearpump/streaming/dsl/op/OpEdge.html" title="interface in io.gearpump.streaming.dsl.op">OpEdge</a>&gt;&nbsp;graph,
<a href="../../../../io/gearpump/streaming/dsl/op/Op.html" title="interface in io.gearpump.streaming.dsl.op">Op</a>&nbsp;thisNode,
scala.Option&lt;<a href="../../../../io/gearpump/streaming/dsl/op/OpEdge.html" title="interface in io.gearpump.streaming.dsl.op">OpEdge</a>&gt;&nbsp;edge,
scala.reflect.ClassTag&lt;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;evidence$1)</code>&nbsp;</td>
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<td class="colFirst"><code>static &lt;T&gt;&nbsp;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="class in io.gearpump.streaming.dsl">Stream</a>&lt;T&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../io/gearpump/streaming/dsl/Stream.html#apply-io.gearpump.util.Graph-io.gearpump.streaming.dsl.op.Op-scala.Option-scala.reflect.ClassTag-">apply</a></span>(io.gearpump.util.Graph&lt;<a href="../../../../io/gearpump/streaming/dsl/op/Op.html" title="interface in io.gearpump.streaming.dsl.op">Op</a>,<a href="../../../../io/gearpump/streaming/dsl/op/OpEdge.html" title="interface in io.gearpump.streaming.dsl.op">OpEdge</a>&gt;&nbsp;graph,
<a href="../../../../io/gearpump/streaming/dsl/op/Op.html" title="interface in io.gearpump.streaming.dsl.op">Op</a>&nbsp;node,
scala.Option&lt;<a href="../../../../io/gearpump/streaming/dsl/op/OpEdge.html" title="interface in io.gearpump.streaming.dsl.op">OpEdge</a>&gt;&nbsp;edge,
scala.reflect.ClassTag&lt;T&gt;&nbsp;evidence$5)</code>&nbsp;</td>
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<td class="colFirst"><code><a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="class in io.gearpump.streaming.dsl">Stream</a>&lt;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../io/gearpump/streaming/dsl/Stream.html#filter-scala.Function1-java.lang.String-">filter</a></span>(scala.Function1&lt;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>,java.lang.Object&gt;&nbsp;fun,
java.lang.String&nbsp;description)</code>
<div class="block">reserve 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="../../../../io/gearpump/streaming/dsl/Stream.html" title="class in io.gearpump.streaming.dsl">Stream</a>&lt;R&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../io/gearpump/streaming/dsl/Stream.html#flatMap-scala.Function1-java.lang.String-scala.reflect.ClassTag-">flatMap</a></span>(scala.Function1&lt;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>,scala.collection.TraversableOnce&lt;R&gt;&gt;&nbsp;fun,
java.lang.String&nbsp;description,
scala.reflect.ClassTag&lt;R&gt;&nbsp;evidence$2)</code>
<div class="block">convert a value[T] to a list of value[R]</div>
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</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>static &lt;K,V&gt;&nbsp;K</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../io/gearpump/streaming/dsl/Stream.html#getTupleKey-scala.Tuple2-">getTupleKey</a></span>(scala.Tuple2&lt;K,V&gt;&nbsp;tuple)</code>&nbsp;</td>
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<td class="colFirst"><code>&lt;Group&gt;&nbsp;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="class in io.gearpump.streaming.dsl">Stream</a>&lt;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../io/gearpump/streaming/dsl/Stream.html#groupBy-scala.Function1-int-java.lang.String-">groupBy</a></span>(scala.Function1&lt;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>,Group&gt;&nbsp;fun,
int&nbsp;parallelism,
java.lang.String&nbsp;description)</code>
<div class="block">Group by fun(T)</div>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../io/gearpump/streaming/dsl/Stream.html#log--">log</a></span>()</code>
<div class="block">Log to task log file</div>
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<tr id="i6" class="altColor">
<td class="colFirst"><code>&lt;R&gt;&nbsp;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="class in io.gearpump.streaming.dsl">Stream</a>&lt;R&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../io/gearpump/streaming/dsl/Stream.html#map-scala.Function1-java.lang.String-scala.reflect.ClassTag-">map</a></span>(scala.Function1&lt;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>,R&gt;&nbsp;fun,
java.lang.String&nbsp;description,
scala.reflect.ClassTag&lt;R&gt;&nbsp;evidence$3)</code>
<div class="block">convert value[T] to value[R]</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code><a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="class in io.gearpump.streaming.dsl">Stream</a>&lt;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../io/gearpump/streaming/dsl/Stream.html#merge-io.gearpump.streaming.dsl.Stream-java.lang.String-">merge</a></span>(<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="class in io.gearpump.streaming.dsl">Stream</a>&lt;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;other,
java.lang.String&nbsp;description)</code>
<div class="block">Merge data from two stream into one</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>&lt;R&gt;&nbsp;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="class in io.gearpump.streaming.dsl">Stream</a>&lt;R&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../io/gearpump/streaming/dsl/Stream.html#process-java.lang.Class-int-java.lang.String-scala.reflect.ClassTag-">process</a></span>(java.lang.Class&lt;? extends <a href="../../../../io/gearpump/streaming/task/Task.html" title="class in io.gearpump.streaming.task">Task</a>&gt;&nbsp;processor,
int&nbsp;parallelism,
java.lang.String&nbsp;description,
scala.reflect.ClassTag&lt;R&gt;&nbsp;evidence$4)</code>
<div class="block">connect with a low level Processor(TaskDescription)</div>
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</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="class in io.gearpump.streaming.dsl">Stream</a>&lt;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../io/gearpump/streaming/dsl/Stream.html#reduce-scala.Function2-java.lang.String-">reduce</a></span>(scala.Function2&lt;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>,<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>,<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;fun,
java.lang.String&nbsp;description)</code>
<div class="block">Reduce opeartion</div>
</td>
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<tr id="i10" class="altColor">
<td class="colFirst"><code>static &lt;K,V&gt;&nbsp;<a href="../../../../io/gearpump/streaming/dsl/KVStream.html" title="class in io.gearpump.streaming.dsl">KVStream</a>&lt;K,V&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../io/gearpump/streaming/dsl/Stream.html#streamToKVStream-io.gearpump.streaming.dsl.Stream-">streamToKVStream</a></span>(<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="class in io.gearpump.streaming.dsl">Stream</a>&lt;scala.Tuple2&lt;K,V&gt;&gt;&nbsp;stream)</code>&nbsp;</td>
</tr>
<tr id="i11" class="rowColor">
<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>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../io/gearpump/streaming/dsl/Stream.html#sumByValue-scala.math.Numeric-">sumByValue</a></span>(scala.math.Numeric&lt;V&gt;&nbsp;numeric)</code>&nbsp;</td>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
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<h4>Stream</h4>
<pre>public&nbsp;Stream(io.gearpump.util.Graph&lt;<a href="../../../../io/gearpump/streaming/dsl/op/Op.html" title="interface in io.gearpump.streaming.dsl.op">Op</a>,<a href="../../../../io/gearpump/streaming/dsl/op/OpEdge.html" title="interface in io.gearpump.streaming.dsl.op">OpEdge</a>&gt;&nbsp;graph,
<a href="../../../../io/gearpump/streaming/dsl/op/Op.html" title="interface in io.gearpump.streaming.dsl.op">Op</a>&nbsp;thisNode,
scala.Option&lt;<a href="../../../../io/gearpump/streaming/dsl/op/OpEdge.html" title="interface in io.gearpump.streaming.dsl.op">OpEdge</a>&gt;&nbsp;edge,
scala.reflect.ClassTag&lt;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;evidence$1)</pre>
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<h4>apply</h4>
<pre>public static&nbsp;&lt;T&gt;&nbsp;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="class in io.gearpump.streaming.dsl">Stream</a>&lt;T&gt;&nbsp;apply(io.gearpump.util.Graph&lt;<a href="../../../../io/gearpump/streaming/dsl/op/Op.html" title="interface in io.gearpump.streaming.dsl.op">Op</a>,<a href="../../../../io/gearpump/streaming/dsl/op/OpEdge.html" title="interface in io.gearpump.streaming.dsl.op">OpEdge</a>&gt;&nbsp;graph,
<a href="../../../../io/gearpump/streaming/dsl/op/Op.html" title="interface in io.gearpump.streaming.dsl.op">Op</a>&nbsp;node,
scala.Option&lt;<a href="../../../../io/gearpump/streaming/dsl/op/OpEdge.html" title="interface in io.gearpump.streaming.dsl.op">OpEdge</a>&gt;&nbsp;edge,
scala.reflect.ClassTag&lt;T&gt;&nbsp;evidence$5)</pre>
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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;sumByValue(scala.math.Numeric&lt;V&gt;&nbsp;numeric)</pre>
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<pre>public static&nbsp;&lt;K,V&gt;&nbsp;<a href="../../../../io/gearpump/streaming/dsl/KVStream.html" title="class in io.gearpump.streaming.dsl">KVStream</a>&lt;K,V&gt;&nbsp;streamToKVStream(<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="class in io.gearpump.streaming.dsl">Stream</a>&lt;scala.Tuple2&lt;K,V&gt;&gt;&nbsp;stream)</pre>
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<pre>public&nbsp;&lt;R&gt;&nbsp;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="class in io.gearpump.streaming.dsl">Stream</a>&lt;R&gt;&nbsp;flatMap(scala.Function1&lt;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>,scala.collection.TraversableOnce&lt;R&gt;&gt;&nbsp;fun,
java.lang.String&nbsp;description,
scala.reflect.ClassTag&lt;R&gt;&nbsp;evidence$2)</pre>
<div class="block">convert a value[T] to a list of value[R]</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>R</code> - the result message type</dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>fun</code> - function</dd>
<dd><code>description</code> - the description message for this operation</dd>
<dd><code>evidence$2</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;&lt;R&gt;&nbsp;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="class in io.gearpump.streaming.dsl">Stream</a>&lt;R&gt;&nbsp;map(scala.Function1&lt;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>,R&gt;&nbsp;fun,
java.lang.String&nbsp;description,
scala.reflect.ClassTag&lt;R&gt;&nbsp;evidence$3)</pre>
<div class="block">convert value[T] to value[R]</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>R</code> - the result message type</dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>fun</code> - function</dd>
<dd><code>description</code> - (undocumented)</dd>
<dd><code>evidence$3</code> - (undocumented)</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a new stream with type [R]</dd>
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<h4>filter</h4>
<pre>public&nbsp;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="class in io.gearpump.streaming.dsl">Stream</a>&lt;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;filter(scala.Function1&lt;<a href="../../../../io/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">reserve records when fun(T) == true</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="../../../../io/gearpump/streaming/dsl/Stream.html" title="class in io.gearpump.streaming.dsl">Stream</a>&lt;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;reduce(scala.Function2&lt;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>,<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>,<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;fun,
java.lang.String&nbsp;description)</pre>
<div class="block">Reduce opeartion</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="../../../../io/gearpump/streaming/dsl/Stream.html" title="class in io.gearpump.streaming.dsl">Stream</a>&lt;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;merge(<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="class in io.gearpump.streaming.dsl">Stream</a>&lt;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;other,
java.lang.String&nbsp;description)</pre>
<div class="block">Merge data from two stream into one</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>
</dl>
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<h4>groupBy</h4>
<pre>public&nbsp;&lt;Group&gt;&nbsp;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="class in io.gearpump.streaming.dsl">Stream</a>&lt;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;groupBy(scala.Function1&lt;<a href="../../../../io/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 fun(T)
<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,
<p>
Stream[People].groupBy(_.gender).flatmap(..).filter.(..).reduce(..)
<p></div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>Group</code> - the group type</dd>
<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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<h4>process</h4>
<pre>public&nbsp;&lt;R&gt;&nbsp;<a href="../../../../io/gearpump/streaming/dsl/Stream.html" title="class in io.gearpump.streaming.dsl">Stream</a>&lt;R&gt;&nbsp;process(java.lang.Class&lt;? extends <a href="../../../../io/gearpump/streaming/task/Task.html" title="class in io.gearpump.streaming.task">Task</a>&gt;&nbsp;processor,
int&nbsp;parallelism,
java.lang.String&nbsp;description,
scala.reflect.ClassTag&lt;R&gt;&nbsp;evidence$4)</pre>
<div class="block">connect with a low level Processor(TaskDescription)</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>R</code> - the result message type</dd>
<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>description</code> - (undocumented)</dd>
<dd><code>evidence$4</code> - (undocumented)</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>new stream after processing with type [R]</dd>
</dl>
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