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apache / incubator-retired-gearpump-site / f2a69d38efa9a4415d78fca68868f176ad60dd49 / . / content / releases / latest / api / java / org / apache / gearpump / streaming / dsl / javaapi / JavaStream.html
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<div class="subTitle">org.apache.gearpump.streaming.dsl.javaapi</div>
<h2 title="Class JavaStream" class="title">Class JavaStream&lt;T&gt;</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
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<li>org.apache.gearpump.streaming.dsl.javaapi.JavaStream&lt;T&gt;</li>
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<pre>public class <span class="typeNameLabel">JavaStream&lt;T&gt;</span>
extends java.lang.Object</pre>
<div class="block">Java DSL</div>
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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/javaapi/JavaStream.html#JavaStream-org.apache.gearpump.streaming.dsl.scalaapi.Stream-">JavaStream</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/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>&gt;&nbsp;stream)</code>&nbsp;</td>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="class in org.apache.gearpump.streaming.dsl.javaapi">JavaStream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.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/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>&gt;&nbsp;fn,
java.lang.String&nbsp;description)</code>
<div class="block">Only keep the messages that FilterFunction returns true.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>&lt;R&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="class in org.apache.gearpump.streaming.dsl.javaapi">JavaStream</a>&lt;R&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html#flatMap-org.apache.gearpump.streaming.dsl.javaapi.functions.FlatMapFunction-java.lang.String-">flatMap</a></span>(<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/functions/FlatMapFunction.html" title="class in org.apache.gearpump.streaming.dsl.javaapi.functions">FlatMapFunction</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>,R&gt;&nbsp;fn,
java.lang.String&nbsp;description)</code>
<div class="block">FlatMap on stream</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>&lt;A&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="class in org.apache.gearpump.streaming.dsl.javaapi">JavaStream</a>&lt;A&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.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/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>,A&gt;&nbsp;fn,
java.lang.String&nbsp;description)</code>&nbsp;</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>&lt;GROUP&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="class in org.apache.gearpump.streaming.dsl.javaapi">JavaStream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html#groupBy-org.apache.gearpump.streaming.dsl.javaapi.functions.GroupByFunction-int-java.lang.String-">groupBy</a></span>(<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/functions/GroupByFunction.html" title="class in org.apache.gearpump.streaming.dsl.javaapi.functions">GroupByFunction</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>,GROUP&gt;&nbsp;fn,
int&nbsp;parallelism,
java.lang.String&nbsp;description)</code>
<div class="block">Group by a stream and turns it to a list of sub-streams.</div>
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</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html#log--">log</a></span>()</code>&nbsp;</td>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>&lt;R&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="class in org.apache.gearpump.streaming.dsl.javaapi">JavaStream</a>&lt;R&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.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/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>,R&gt;&nbsp;fn,
java.lang.String&nbsp;description)</code>
<div class="block">Map on stream</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="class in org.apache.gearpump.streaming.dsl.javaapi">JavaStream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html#merge-org.apache.gearpump.streaming.dsl.javaapi.JavaStream-int-java.lang.String-">merge</a></span>(<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="class in org.apache.gearpump.streaming.dsl.javaapi">JavaStream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>&gt;&nbsp;other,
int&nbsp;parallelism,
java.lang.String&nbsp;description)</code>
<div class="block">Merges streams of same type together</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>&lt;R&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="class in org.apache.gearpump.streaming.dsl.javaapi">JavaStream</a>&lt;R&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.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">Add a low level Processor to process messages</div>
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<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="class in org.apache.gearpump.streaming.dsl.javaapi">JavaStream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.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/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>&gt;&nbsp;fn,
java.lang.String&nbsp;description)</code>
<div class="block">Does aggregation on the stream</div>
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<tr id="i9" 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/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html#stream--">stream</a></span>()</code>&nbsp;</td>
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<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="class in org.apache.gearpump.streaming.dsl.javaapi">JavaStream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html#window-org.apache.gearpump.streaming.dsl.window.api.Windows-">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>&nbsp;win)</code>&nbsp;</td>
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<pre>public&nbsp;JavaStream(<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/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>&gt;&nbsp;stream)</pre>
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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/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>&gt;&nbsp;stream()</pre>
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<pre>public&nbsp;&lt;R&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="class in org.apache.gearpump.streaming.dsl.javaapi">JavaStream</a>&lt;R&gt;&nbsp;flatMap(<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/functions/FlatMapFunction.html" title="class in org.apache.gearpump.streaming.dsl.javaapi.functions">FlatMapFunction</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>,R&gt;&nbsp;fn,
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<div class="block">FlatMap on stream</div>
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<pre>public&nbsp;&lt;R&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="class in org.apache.gearpump.streaming.dsl.javaapi">JavaStream</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/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>,R&gt;&nbsp;fn,
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<div class="block">Map on stream</div>
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<pre>public&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="class in org.apache.gearpump.streaming.dsl.javaapi">JavaStream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="type parameter in JavaStream">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/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>&gt;&nbsp;fn,
java.lang.String&nbsp;description)</pre>
<div class="block">Only keep the messages that FilterFunction returns true.</div>
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<pre>public&nbsp;&lt;A&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="class in org.apache.gearpump.streaming.dsl.javaapi">JavaStream</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/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>,A&gt;&nbsp;fn,
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<h4>reduce</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="class in org.apache.gearpump.streaming.dsl.javaapi">JavaStream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="type parameter in JavaStream">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/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>&gt;&nbsp;fn,
java.lang.String&nbsp;description)</pre>
<div class="block">Does aggregation on the stream</div>
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<pre>public&nbsp;void&nbsp;log()</pre>
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<pre>public&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="class in org.apache.gearpump.streaming.dsl.javaapi">JavaStream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>&gt;&nbsp;merge(<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="class in org.apache.gearpump.streaming.dsl.javaapi">JavaStream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>&gt;&nbsp;other,
int&nbsp;parallelism,
java.lang.String&nbsp;description)</pre>
<div class="block">Merges streams of same type together</div>
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<h4>groupBy</h4>
<pre>public&nbsp;&lt;GROUP&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="class in org.apache.gearpump.streaming.dsl.javaapi">JavaStream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>&gt;&nbsp;groupBy(<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/functions/GroupByFunction.html" title="class in org.apache.gearpump.streaming.dsl.javaapi.functions">GroupByFunction</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="type parameter in JavaStream">T</a>,GROUP&gt;&nbsp;fn,
int&nbsp;parallelism,
java.lang.String&nbsp;description)</pre>
<div class="block">Group by a stream and turns it to a list of sub-streams. Operations chained after
groupBy applies to sub-streams.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>fn</code> - (undocumented)</dd>
<dd><code>parallelism</code> - (undocumented)</dd>
<dd><code>description</code> - (undocumented)</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>(undocumented)</dd>
</dl>
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<h4>window</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="class in org.apache.gearpump.streaming.dsl.javaapi">JavaStream</a>&lt;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="type parameter in JavaStream">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>&nbsp;win)</pre>
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<h4>process</h4>
<pre>public&nbsp;&lt;R&gt;&nbsp;<a href="../../../../../../org/apache/gearpump/streaming/dsl/javaapi/JavaStream.html" title="class in org.apache.gearpump.streaming.dsl.javaapi">JavaStream</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">Add a low level Processor to process messages</div>
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