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<div class="subTitle">org.apache.gearpump.streaming.dsl.scalaapi</div>
<h2 title="Class Stream" class="title">Class Stream&lt;T&gt;</h2>
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<li>java.lang.Object</li>
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<li>org.apache.gearpump.streaming.dsl.scalaapi.Stream&lt;T&gt;</li>
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<pre>public class <span class="typeNameLabel">Stream&lt;T&gt;</span>
extends java.lang.Object</pre>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.Sink.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream.Sink</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.Sink.html" title="type parameter in Stream.Sink">T</a>&gt;</span></code>&nbsp;</td>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html#Stream-org.apache.gearpump.util.Graph-org.apache.gearpump.streaming.dsl.plan.Op-scala.Option-">Stream</a></span>(<a href="../../../../../../org/apache/gearpump/util/Graph.html" title="class in org.apache.gearpump.util">Graph</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/plan/Op.html" title="interface in org.apache.gearpump.streaming.dsl.plan">Op</a>,<a href="../../../../../../org/apache/gearpump/streaming/dsl/plan/OpEdge.html" title="interface in org.apache.gearpump.streaming.dsl.plan">OpEdge</a>&gt;&nbsp;graph,
<a href="../../../../../../org/apache/gearpump/streaming/dsl/plan/Op.html" title="interface in org.apache.gearpump.streaming.dsl.plan">Op</a>&nbsp;thisNode,
scala.Option&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/plan/OpEdge.html" title="interface in org.apache.gearpump.streaming.dsl.plan">OpEdge</a>&gt;&nbsp;edge)</code>&nbsp;</td>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code>static &lt;T&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;T&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html#apply-org.apache.gearpump.util.Graph-org.apache.gearpump.streaming.dsl.plan.Op-scala.Option-">apply</a></span>(<a href="../../../../../../org/apache/gearpump/util/Graph.html" title="class in org.apache.gearpump.util">Graph</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/plan/Op.html" title="interface in org.apache.gearpump.streaming.dsl.plan">Op</a>,<a href="../../../../../../org/apache/gearpump/streaming/dsl/plan/OpEdge.html" title="interface in org.apache.gearpump.streaming.dsl.plan">OpEdge</a>&gt;&nbsp;graph,
<a href="../../../../../../org/apache/gearpump/streaming/dsl/plan/Op.html" title="interface in org.apache.gearpump.streaming.dsl.plan">Op</a>&nbsp;node,
scala.Option&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/plan/OpEdge.html" title="interface in org.apache.gearpump.streaming.dsl.plan">OpEdge</a>&gt;&nbsp;edge)</code>&nbsp;</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/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/scalaapi/Stream.html#filter-org.apache.gearpump.streaming.dsl.api.functions.FilterFunction-java.lang.String-">filter</a></span>(<a href="../../../../../../org/apache/gearpump/streaming/dsl/api/functions/FilterFunction.html" title="class in org.apache.gearpump.streaming.dsl.api.functions">FilterFunction</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;fn,
java.lang.String&nbsp;description)</code>
<div class="block">Returns a new Stream keeping the elements that satisfy the filter function.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/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/scalaapi/Stream.html#filter-scala.Function1-java.lang.String-">filter</a></span>(scala.Function1&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>,java.lang.Object&gt;&nbsp;fn,
java.lang.String&nbsp;description)</code>
<div class="block">Returns a new Stream keeping the elements that satisfy the filter function.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>&lt;R&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;R&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html#flatMap-org.apache.gearpump.streaming.dsl.scalaapi.functions.FlatMapFunction-java.lang.String-">flatMap</a></span>(<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/functions/FlatMapFunction.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi.functions">FlatMapFunction</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>,R&gt;&nbsp;fn,
java.lang.String&nbsp;description)</code>
<div class="block">Returns a new stream by applying a flatMap function to each element
and flatten the results.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>&lt;R&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;R&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html#flatMap-scala.Function1-java.lang.String-">flatMap</a></span>(scala.Function1&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>,scala.collection.TraversableOnce&lt;R&gt;&gt;&nbsp;fn,
java.lang.String&nbsp;description)</code>
<div class="block">Returns a new stream by applying a flatMap function to each element
and flatten the results.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>&lt;A&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;A&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html#fold-org.apache.gearpump.streaming.dsl.api.functions.FoldFunction-java.lang.String-">fold</a></span>(<a href="../../../../../../org/apache/gearpump/streaming/dsl/api/functions/FoldFunction.html" title="class in org.apache.gearpump.streaming.dsl.api.functions">FoldFunction</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>,A&gt;&nbsp;fn,
java.lang.String&nbsp;description)</code>
<div class="block">Returns a new stream by applying a fold function over all the elements</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>static &lt;K,V&gt;&nbsp;K</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html#getTupleKey-scala.Tuple2-">getTupleKey</a></span>(scala.Tuple2&lt;K,V&gt;&nbsp;tuple)</code>&nbsp;</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>&lt;GROUP&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/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/scalaapi/Stream.html#groupBy-scala.Function1-int-java.lang.String-">groupBy</a></span>(scala.Function1&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>,GROUP&gt;&nbsp;fn,
int&nbsp;parallelism,
java.lang.String&nbsp;description)</code>
<div class="block">Group by function (T =&gt; Group)</div>
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</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html#log--">log</a></span>()</code>
<div class="block">Log to task log file</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>&lt;R&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;R&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html#map-scala.Function1-java.lang.String-">map</a></span>(scala.Function1&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>,R&gt;&nbsp;fn,
java.lang.String&nbsp;description)</code>
<div class="block">Returns a new stream by applying a map function to each element.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>&lt;R&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;R&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html#map-org.apache.gearpump.streaming.dsl.api.functions.MapFunction-java.lang.String-">map</a></span>(<a href="../../../../../../org/apache/gearpump/streaming/dsl/api/functions/MapFunction.html" title="class in org.apache.gearpump.streaming.dsl.api.functions">MapFunction</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>,R&gt;&nbsp;fn,
java.lang.String&nbsp;description)</code>
<div class="block">Returns a new stream by applying a map function to each element.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/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/scalaapi/Stream.html#merge-org.apache.gearpump.streaming.dsl.scalaapi.Stream-java.lang.String-">merge</a></span>(<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;other,
java.lang.String&nbsp;description)</code>
<div class="block">Merges data from two stream into one</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>&lt;R&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;R&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/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,
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)</code>
<div class="block">Connects with a low level Processor(TaskDescription)</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/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/scalaapi/Stream.html#reduce-scala.Function2-java.lang.String-">reduce</a></span>(scala.Function2&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>,<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>,<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;fn,
java.lang.String&nbsp;description)</code>
<div class="block">Returns a new stream by applying a reduce function over all the elements.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/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/scalaapi/Stream.html#reduce-org.apache.gearpump.streaming.dsl.api.functions.ReduceFunction-java.lang.String-">reduce</a></span>(<a href="../../../../../../org/apache/gearpump/streaming/dsl/api/functions/ReduceFunction.html" title="class in org.apache.gearpump.streaming.dsl.api.functions">ReduceFunction</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;fn,
java.lang.String&nbsp;description)</code>
<div class="block">Returns a new stream by applying a reduce function over all the elements.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>static &lt;K,V&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/KVStream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">KVStream</a>&lt;K,V&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html#streamToKVStream-org.apache.gearpump.streaming.dsl.scalaapi.Stream-">streamToKVStream</a></span>(<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;scala.Tuple2&lt;K,V&gt;&gt;&nbsp;stream)</code>&nbsp;</td>
</tr>
<tr id="i16" class="altColor">
<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="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html#sumByKey-scala.math.Numeric-">sumByKey</a></span>(scala.math.Numeric&lt;V&gt;&nbsp;numeric)</code>&nbsp;</td>
</tr>
<tr id="i17" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/WindowStream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">WindowStream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/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/scalaapi/Stream.html#window-org.apache.gearpump.streaming.dsl.window.api.Windows-java.lang.String-">window</a></span>(<a href="../../../../../../org/apache/gearpump/streaming/dsl/window/api/Windows.html" title="class in org.apache.gearpump.streaming.dsl.window.api">Windows</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;win,
java.lang.String&nbsp;description)</code>
<div class="block">Window function</div>
</td>
</tr>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
</ul>
</li>
</ul>
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<pre>public&nbsp;Stream(<a href="../../../../../../org/apache/gearpump/util/Graph.html" title="class in org.apache.gearpump.util">Graph</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/plan/Op.html" title="interface in org.apache.gearpump.streaming.dsl.plan">Op</a>,<a href="../../../../../../org/apache/gearpump/streaming/dsl/plan/OpEdge.html" title="interface in org.apache.gearpump.streaming.dsl.plan">OpEdge</a>&gt;&nbsp;graph,
<a href="../../../../../../org/apache/gearpump/streaming/dsl/plan/Op.html" title="interface in org.apache.gearpump.streaming.dsl.plan">Op</a>&nbsp;thisNode,
scala.Option&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/plan/OpEdge.html" title="interface in org.apache.gearpump.streaming.dsl.plan">OpEdge</a>&gt;&nbsp;edge)</pre>
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<pre>public static&nbsp;&lt;T&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;T&gt;&nbsp;apply(<a href="../../../../../../org/apache/gearpump/util/Graph.html" title="class in org.apache.gearpump.util">Graph</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/plan/Op.html" title="interface in org.apache.gearpump.streaming.dsl.plan">Op</a>,<a href="../../../../../../org/apache/gearpump/streaming/dsl/plan/OpEdge.html" title="interface in org.apache.gearpump.streaming.dsl.plan">OpEdge</a>&gt;&nbsp;graph,
<a href="../../../../../../org/apache/gearpump/streaming/dsl/plan/Op.html" title="interface in org.apache.gearpump.streaming.dsl.plan">Op</a>&nbsp;node,
scala.Option&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/plan/OpEdge.html" title="interface in org.apache.gearpump.streaming.dsl.plan">OpEdge</a>&gt;&nbsp;edge)</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;sumByKey(scala.math.Numeric&lt;V&gt;&nbsp;numeric)</pre>
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<pre>public static&nbsp;&lt;K,V&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/KVStream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">KVStream</a>&lt;K,V&gt;&nbsp;streamToKVStream(<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">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="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;R&gt;&nbsp;flatMap(scala.Function1&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>,scala.collection.TraversableOnce&lt;R&gt;&gt;&nbsp;fn,
java.lang.String&nbsp;description)</pre>
<div class="block">Returns a new stream by applying a flatMap function to each element
and flatten the results.
<p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>fn</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>
</dl>
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<pre>public&nbsp;&lt;R&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;R&gt;&nbsp;flatMap(<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/functions/FlatMapFunction.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi.functions">FlatMapFunction</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>,R&gt;&nbsp;fn,
java.lang.String&nbsp;description)</pre>
<div class="block">Returns a new stream by applying a flatMap function to each element
and flatten the results.
<p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>fn</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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<pre>public&nbsp;&lt;R&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;R&gt;&nbsp;map(scala.Function1&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>,R&gt;&nbsp;fn,
java.lang.String&nbsp;description)</pre>
<div class="block">Returns a new stream by applying a map function to each element.
<p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>fn</code> - map function</dd>
<dd><code>description</code> - (undocumented)</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A new stream with type [R]</dd>
</dl>
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<pre>public&nbsp;&lt;R&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;R&gt;&nbsp;map(<a href="../../../../../../org/apache/gearpump/streaming/dsl/api/functions/MapFunction.html" title="class in org.apache.gearpump.streaming.dsl.api.functions">MapFunction</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>,R&gt;&nbsp;fn,
java.lang.String&nbsp;description)</pre>
<div class="block">Returns a new stream by applying a map function to each element.
<p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>fn</code> - map 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/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;filter(scala.Function1&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>,java.lang.Object&gt;&nbsp;fn,
java.lang.String&nbsp;description)</pre>
<div class="block">Returns a new Stream keeping the elements that satisfy the filter function.
<p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>fn</code> - filter function</dd>
<dd><code>description</code> - (undocumented)</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a new stream after filter</dd>
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<pre>public&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;filter(<a href="../../../../../../org/apache/gearpump/streaming/dsl/api/functions/FilterFunction.html" title="class in org.apache.gearpump.streaming.dsl.api.functions">FilterFunction</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;fn,
java.lang.String&nbsp;description)</pre>
<div class="block">Returns a new Stream keeping the elements that satisfy the filter function.
<p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>fn</code> - filter function</dd>
<dd><code>description</code> - (undocumented)</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a new stream after filter</dd>
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<pre>public&nbsp;&lt;A&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;A&gt;&nbsp;fold(<a href="../../../../../../org/apache/gearpump/streaming/dsl/api/functions/FoldFunction.html" title="class in org.apache.gearpump.streaming.dsl.api.functions">FoldFunction</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>,A&gt;&nbsp;fn,
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<div class="block">Returns a new stream by applying a fold function over all the elements
<p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>fn</code> - fold function</dd>
<dd><code>description</code> - (undocumented)</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a new stream after fold</dd>
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<pre>public&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;reduce(scala.Function2&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>,<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>,<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;fn,
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<div class="block">Returns a new stream by applying a reduce function over all the elements.
<p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>fn</code> - reduce function</dd>
<dd><code>description</code> - description message for this operator</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a new stream after reduce</dd>
</dl>
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<pre>public&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;reduce(<a href="../../../../../../org/apache/gearpump/streaming/dsl/api/functions/ReduceFunction.html" title="class in org.apache.gearpump.streaming.dsl.api.functions">ReduceFunction</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;fn,
java.lang.String&nbsp;description)</pre>
<div class="block">Returns a new stream by applying a reduce function over all the elements.
<p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>fn</code> - reduce function</dd>
<dd><code>description</code> - description message for this operator</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a new stream after reduce</dd>
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<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/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;merge(<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/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/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">Stream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;groupBy(scala.Function1&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>,GROUP&gt;&nbsp;fn,
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>fn</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>
</dl>
</li>
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<pre>public&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/WindowStream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">WindowStream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;window(<a href="../../../../../../org/apache/gearpump/streaming/dsl/window/api/Windows.html" title="class in org.apache.gearpump.streaming.dsl.window.api">Windows</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="type parameter in Stream">T</a>&gt;&nbsp;win,
java.lang.String&nbsp;description)</pre>
<div class="block">Window function
<p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>win</code> - window definition</dd>
<dd><code>description</code> - window description</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/WindowStream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi"><code>WindowStream</code></a> where groupBy could be applied</dd>
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<h4>process</h4>
<pre>public&nbsp;&lt;R&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi">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>
</li>
</ul>
</li>
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