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Posted to commits@gearpump.apache.org by ma...@apache.org on 2017/04/26 03:08:21 UTC

[19/51] [partial] incubator-gearpump-site git commit: [GEARPUMP-299] Update gearpump.apache.org page for 0.8.3 release

http://git-wip-us.apache.org/repos/asf/incubator-gearpump-site/blob/ec689a85/content/releases/latest/api/java/org/apache/gearpump/streaming/dsl/scalaapi/Stream.html
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diff --git a/content/releases/latest/api/java/org/apache/gearpump/streaming/dsl/scalaapi/Stream.html b/content/releases/latest/api/java/org/apache/gearpump/streaming/dsl/scalaapi/Stream.html
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@@ -0,0 +1,712 @@
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+<title>Stream</title>
+<meta name="date" content="2017-04-25">
+<link rel="stylesheet" type="text/css" href="../../../../../../stylesheet.css" title="Style">
+<script type="text/javascript" src="../../../../../../script.js"></script>
+</head>
+<body>
+<script type="text/javascript"><!--
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+            parent.document.title="Stream";
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+<div>JavaScript is disabled on your browser.</div>
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+<!-- ========= START OF TOP NAVBAR ======= -->
+<div class="topNav"><a name="navbar.top">
+<!--   -->
+</a>
+<div class="skipNav"><a href="#skip.navbar.top" title="Skip navigation links">Skip navigation links</a></div>
+<a name="navbar.top.firstrow">
+<!--   -->
+</a>
+<ul class="navList" title="Navigation">
+<li><a href="../../../../../../overview-summary.html">Overview</a></li>
+<li><a href="package-summary.html">Package</a></li>
+<li class="navBarCell1Rev">Class</li>
+<li><a href="package-tree.html">Tree</a></li>
+<li><a href="../../../../../../deprecated-list.html">Deprecated</a></li>
+<li><a href="../../../../../../index-all.html">Index</a></li>
+<li><a href="../../../../../../help-doc.html">Help</a></li>
+</ul>
+</div>
+<div class="subNav">
+<ul class="navList">
+<li><a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/LoggerSink.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi"><span class="typeNameLink">Prev&nbsp;Class</span></a></li>
+<li><a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/Stream.Sink.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi"><span class="typeNameLink">Next&nbsp;Class</span></a></li>
+</ul>
+<ul class="navList">
+<li><a href="../../../../../../index.html?org/apache/gearpump/streaming/dsl/scalaapi/Stream.html" target="_top">Frames</a></li>
+<li><a href="Stream.html" target="_top">No&nbsp;Frames</a></li>
+</ul>
+<ul class="navList" id="allclasses_navbar_top">
+<li><a href="../../../../../../allclasses-noframe.html">All&nbsp;Classes</a></li>
+</ul>
+<div>
+<script type="text/javascript"><!--
+  allClassesLink = document.getElementById("allclasses_navbar_top");
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+  //-->
+</script>
+</div>
+<div>
+<ul class="subNavList">
+<li>Summary:&nbsp;</li>
+<li><a href="#nested.class.summary">Nested</a>&nbsp;|&nbsp;</li>
+<li>Field&nbsp;|&nbsp;</li>
+<li><a href="#constructor.summary">Constr</a>&nbsp;|&nbsp;</li>
+<li><a href="#method.summary">Method</a></li>
+</ul>
+<ul class="subNavList">
+<li>Detail:&nbsp;</li>
+<li>Field&nbsp;|&nbsp;</li>
+<li><a href="#constructor.detail">Constr</a>&nbsp;|&nbsp;</li>
+<li><a href="#method.detail">Method</a></li>
+</ul>
+</div>
+<a name="skip.navbar.top">
+<!--   -->
+</a></div>
+<!-- ========= END OF TOP NAVBAR ========= -->
+<!-- ======== START OF CLASS DATA ======== -->
+<div class="header">
+<div class="subTitle">org.apache.gearpump.streaming.dsl.scalaapi</div>
+<h2 title="Class Stream" class="title">Class Stream&lt;T&gt;</h2>
+</div>
+<div class="contentContainer">
+<ul class="inheritance">
+<li>java.lang.Object</li>
+<li>
+<ul class="inheritance">
+<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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+<caption><span>Nested Classes</span><span class="tabEnd">&nbsp;</span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Class and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colFirst"><code>static class&nbsp;</code></td>
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+<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
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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,
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+<th class="colFirst" scope="col">Modifier and Type</th>
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+<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>
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+     <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>
+</tr>
+<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>
+</td>
+</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>
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+<tr id="i16" class="altColor">
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+                                  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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+                             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>
+</li>
+</ul>
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+                             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>
+</li>
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+                         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>
+</li>
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+                         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>
+</li>
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+                        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>
+</dl>
+</li>
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+                        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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+                          java.lang.String&nbsp;description)</pre>
+<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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+                        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>
+</dl>
+</li>
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+                        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>
+</dl>
+</li>
+</ul>
+<a name="log--">
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+<pre>public&nbsp;void&nbsp;log()</pre>
+<div class="block">Log to task log file</div>
+</li>
+</ul>
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+                       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>
+</dl>
+</li>
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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>
+</ul>
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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>
+</dl>
+</li>
+</ul>
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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;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>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+<!-- ========= END OF CLASS DATA ========= -->
+<!-- ======= START OF BOTTOM NAVBAR ====== -->
+<div class="bottomNav"><a name="navbar.bottom">
+<!--   -->
+</a>
+<div class="skipNav"><a href="#skip.navbar.bottom" title="Skip navigation links">Skip navigation links</a></div>
+<a name="navbar.bottom.firstrow">
+<!--   -->
+</a>
+<ul class="navList" title="Navigation">
+<li><a href="../../../../../../overview-summary.html">Overview</a></li>
+<li><a href="package-summary.html">Package</a></li>
+<li class="navBarCell1Rev">Class</li>
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diff --git a/content/releases/latest/api/java/org/apache/gearpump/streaming/dsl/scalaapi/StreamApp.Source.html b/content/releases/latest/api/java/org/apache/gearpump/streaming/dsl/scalaapi/StreamApp.Source.html
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+<h2 title="Class StreamApp.Source" class="title">Class StreamApp.Source</h2>
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+<ul class="inheritance">
+<li>java.lang.Object</li>
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+<pre>public static class <span class="typeNameLabel">StreamApp.Source</span>
+extends java.lang.Object
+implements java.io.Serializable</pre>
+<dl>
+<dt><span class="seeLabel">See Also:</span></dt>
+<dd><a href="../../../../../../serialized-form.html#org.apache.gearpump.streaming.dsl.scalaapi.StreamApp.Source">Serialized Form</a></dd>
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+                            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>
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diff --git a/content/releases/latest/api/java/org/apache/gearpump/streaming/dsl/scalaapi/StreamApp.html b/content/releases/latest/api/java/org/apache/gearpump/streaming/dsl/scalaapi/StreamApp.html
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+++ b/content/releases/latest/api/java/org/apache/gearpump/streaming/dsl/scalaapi/StreamApp.html
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+    }
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+<li><a href="../../../../../../deprecated-list.html">Deprecated</a></li>
+<li><a href="../../../../../../index-all.html">Index</a></li>
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+<li><a href="../../../../../../org/apache/gearpump/streaming/dsl/scalaapi/StreamApp.Source.html" title="class in org.apache.gearpump.streaming.dsl.scalaapi"><span class="typeNameLink">Next&nbsp;Class</span></a></li>
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+<ul class="subNavList">
+<li>Summary:&nbsp;</li>
+<li><a href="#nested.class.summary">Nested</a>&nbsp;|&nbsp;</li>
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+<li><a href="#method.summary">Method</a></li>
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+<ul class="subNavList">
+<li>Detail:&nbsp;</li>
+<li>Field&nbsp;|&nbsp;</li>
+<li><a href="#constructor.detail">Constr</a>&nbsp;|&nbsp;</li>
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+<!-- ========= END OF TOP NAVBAR ========= -->
+<!-- ======== START OF CLASS DATA ======== -->
+<div class="header">
+<div class="subTitle">org.apache.gearpump.streaming.dsl.scalaapi</div>
+<h2 title="Class StreamApp" class="title">Class StreamApp</h2>
+</div>
+<div class="contentContainer">
+<ul class="inheritance">
+<li>java.lang.Object</li>
+<li>
+<ul class="inheritance">
+<li>org.apache.gearpump.streaming.dsl.scalaapi.StreamApp</li>
+</ul>
+</li>
+</ul>
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+<br>
+<pre>public class <span class="typeNameLabel">StreamApp</span>
+extends java.lang.Object</pre>
+<div class="block">Example:
+ <pre><code>
+ val data = "This is a good start, bingo!! bingo!!"
+ app.fromCollection(data.lines.toList).
+ // word =&gt; (word, count)
+ flatMap(line =&gt; line.split("[\\s]+")).map((_, 1)).
+ // (word, count1), (word, count2) =&gt; (word, count1 + count2)
+ groupBy(kv =&gt; kv._1).reduce(sum(_, _))
+
+ val appId = context.submit(app)
+ context.close()
+ </code></pre>
+ <p>
+ param:  name name of app</div>
+</li>
+</ul>
+</div>
+<div class="summary">
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+<h2 title="Class StreamAppSpec" class="title">Class StreamAppSpec</h2>
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