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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.heron.streamlet.impl.groupings</a></div> |
| <h2 title="Class ReduceByKeyAndWindowCustomGrouping" class="title">Class ReduceByKeyAndWindowCustomGrouping<R,​K></h2> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.heron.streamlet.impl.groupings.ReduceByKeyAndWindowCustomGrouping<R,​K></li> |
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| <dt>All Implemented Interfaces:</dt> |
| <dd><code>java.io.Serializable</code>, <code><a href="../../../api/grouping/CustomStreamGrouping.html" title="interface in org.apache.heron.api.grouping">CustomStreamGrouping</a></code>, <code><a href="../../../api/grouping/StreamGrouping.html" title="interface in org.apache.heron.api.grouping">StreamGrouping</a></code></dd> |
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| <pre>public class <span class="typeNameLabel">ReduceByKeyAndWindowCustomGrouping<R,​K></span> |
| extends java.lang.Object |
| implements <a href="../../../api/grouping/CustomStreamGrouping.html" title="interface in org.apache.heron.api.grouping">CustomStreamGrouping</a></pre> |
| <div class="block">ReduceByKeyAndWindowCustomGrouping is the class that routes the incoming tuples |
| into the ReduceByKeyAndWindowOperator. It essentially ensures that the values being |
| routed are of type KeyValue uses the key to route the tuple to the destination. |
| The current implementation is identical to JoinCustomGrouping but it might |
| evolve in the future.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../serialized-form.html#org.apache.heron.streamlet.impl.groupings.ReduceByKeyAndWindowCustomGrouping">Serialized Form</a></dd> |
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| <th class="colFirst" scope="col">Constructor</th> |
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| <tr class="altColor"> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(org.apache.heron.streamlet.SerializableFunction)">ReduceByKeyAndWindowCustomGrouping</a></span>​(<a href="../../SerializableFunction.html" title="interface in org.apache.heron.streamlet">SerializableFunction</a><<a href="ReduceByKeyAndWindowCustomGrouping.html" title="type parameter in ReduceByKeyAndWindowCustomGrouping">R</a>,​<a href="ReduceByKeyAndWindowCustomGrouping.html" title="type parameter in ReduceByKeyAndWindowCustomGrouping">K</a>> keyExtractor)</code></th> |
| <td class="colLast"> </td> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
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| <td class="colFirst"><code>java.util.List<java.lang.Integer></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#chooseTasks(java.util.List)">chooseTasks</a></span>​(java.util.List<java.lang.Object> values)</code></th> |
| <td class="colLast"> |
| <div class="block">This function implements a custom stream grouping.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#prepare(org.apache.heron.api.topology.TopologyContext,java.lang.String,java.lang.String,java.util.List)">prepare</a></span>​(<a href="../../../api/topology/TopologyContext.html" title="interface in org.apache.heron.api.topology">TopologyContext</a> context, |
| java.lang.String component, |
| java.lang.String streamId, |
| java.util.List<java.lang.Integer> targetTasks)</code></th> |
| <td class="colLast"> |
| <div class="block">Tells the stream grouping at runtime the tasks in the target bolt.</div> |
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| <h3>Methods inherited from class java.lang.Object</h3> |
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| <h3>Methods inherited from interface org.apache.heron.api.grouping.<a href="../../../api/grouping/CustomStreamGrouping.html" title="interface in org.apache.heron.api.grouping">CustomStreamGrouping</a></h3> |
| <code><a href="../../../api/grouping/CustomStreamGrouping.html#buildStream(java.lang.String,java.lang.String)">buildStream</a></code></li> |
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| <h4>ReduceByKeyAndWindowCustomGrouping</h4> |
| <pre>public ReduceByKeyAndWindowCustomGrouping​(<a href="../../SerializableFunction.html" title="interface in org.apache.heron.streamlet">SerializableFunction</a><<a href="ReduceByKeyAndWindowCustomGrouping.html" title="type parameter in ReduceByKeyAndWindowCustomGrouping">R</a>,​<a href="ReduceByKeyAndWindowCustomGrouping.html" title="type parameter in ReduceByKeyAndWindowCustomGrouping">K</a>> keyExtractor)</pre> |
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| <h4>prepare</h4> |
| <pre class="methodSignature">public void prepare​(<a href="../../../api/topology/TopologyContext.html" title="interface in org.apache.heron.api.topology">TopologyContext</a> context, |
| java.lang.String component, |
| java.lang.String streamId, |
| java.util.List<java.lang.Integer> targetTasks)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../api/grouping/CustomStreamGrouping.html#prepare(org.apache.heron.api.topology.TopologyContext,java.lang.String,java.lang.String,java.util.List)">CustomStreamGrouping</a></code></span></div> |
| <div class="block">Tells the stream grouping at runtime the tasks in the target bolt. |
| This information should be used in chooseTasks to determine the target tasks. |
| <p> |
| It also tells the grouping the metadata on the stream this grouping will be used on.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../api/grouping/CustomStreamGrouping.html#prepare(org.apache.heron.api.topology.TopologyContext,java.lang.String,java.lang.String,java.util.List)">prepare</a></code> in interface <code><a href="../../../api/grouping/CustomStreamGrouping.html" title="interface in org.apache.heron.api.grouping">CustomStreamGrouping</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="chooseTasks(java.util.List)"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
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| <h4>chooseTasks</h4> |
| <pre class="methodSignature">public java.util.List<java.lang.Integer> chooseTasks​(java.util.List<java.lang.Object> values)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../api/grouping/CustomStreamGrouping.html#chooseTasks(java.util.List)">CustomStreamGrouping</a></code></span></div> |
| <div class="block">This function implements a custom stream grouping. It takes in as input |
| the number of tasks in the target bolt in prepare and returns the |
| tasks to send the tuples to.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../api/grouping/CustomStreamGrouping.html#chooseTasks(java.util.List)">chooseTasks</a></code> in interface <code><a href="../../../api/grouping/CustomStreamGrouping.html" title="interface in org.apache.heron.api.grouping">CustomStreamGrouping</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>values</code> - the values to group on</dd> |
| </dl> |
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