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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.heron.streamlet.impl.operators</a></div> |
| <h2 title="Class SplitOperator" class="title">Class SplitOperator<R></h2> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
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| <li><a href="../../../api/bolt/BaseRichBolt.html" title="class in org.apache.heron.api.bolt">org.apache.heron.api.bolt.BaseRichBolt</a></li> |
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| <ul class="inheritance"> |
| <li><a href="StreamletOperator.html" title="class in org.apache.heron.streamlet.impl.operators">org.apache.heron.streamlet.impl.operators.StreamletOperator</a><R,​R></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.heron.streamlet.impl.operators.SplitOperator<R></li> |
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| <dt>All Implemented Interfaces:</dt> |
| <dd><code>java.io.Serializable</code>, <code><a href="../../../api/bolt/IBolt.html" title="interface in org.apache.heron.api.bolt">IBolt</a></code>, <code><a href="../../../api/bolt/IRichBolt.html" title="interface in org.apache.heron.api.bolt">IRichBolt</a></code>, <code><a href="../../../api/topology/IComponent.html" title="interface in org.apache.heron.api.topology">IComponent</a></code>, <code><a href="../../IStreamletOperator.html" title="interface in org.apache.heron.streamlet">IStreamletOperator</a><R,​R></code>, <code><a href="../../IStreamletRichOperator.html" title="interface in org.apache.heron.streamlet">IStreamletRichOperator</a><R,​R></code></dd> |
| </dl> |
| <hr> |
| <pre>public class <span class="typeNameLabel">SplitOperator<R></span> |
| extends <a href="StreamletOperator.html" title="class in org.apache.heron.streamlet.impl.operators">StreamletOperator</a><R,​R></pre> |
| <div class="block">SplitOperator is the class that implements the split functionality. |
| It takes in the split function as the input and use it to process tuples and |
| get the output stream id and emit to the specific streams. |
| Note that one tuple can be emitted to multiple or zero streams.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../serialized-form.html#org.apache.heron.streamlet.impl.operators.SplitOperator">Serialized Form</a></dd> |
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| <h3>Fields inherited from class org.apache.heron.streamlet.impl.operators.<a href="StreamletOperator.html" title="class in org.apache.heron.streamlet.impl.operators">StreamletOperator</a></h3> |
| <code><a href="StreamletOperator.html#collector">collector</a>, <a href="StreamletOperator.html#OUTPUT_FIELD_NAME">OUTPUT_FIELD_NAME</a></code></li> |
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| <tr class="altColor"> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(java.util.Map)">SplitOperator</a></span>​(java.util.Map<java.lang.String,​<a href="../../SerializablePredicate.html" title="interface in org.apache.heron.streamlet">SerializablePredicate</a><<a href="SplitOperator.html" title="type parameter in SplitOperator">R</a>>> splitFns)</code></th> |
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| <tr> |
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| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#declareOutputFields(org.apache.heron.api.topology.OutputFieldsDeclarer)">declareOutputFields</a></span>​(<a href="../../../api/topology/OutputFieldsDeclarer.html" title="interface in org.apache.heron.api.topology">OutputFieldsDeclarer</a> declarer)</code></th> |
| <td class="colLast"> |
| <div class="block">The operators implementing streamlet functionality have some properties.</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="#execute(org.apache.heron.api.tuple.Tuple)">execute</a></span>​(<a href="../../../api/tuple/Tuple.html" title="interface in org.apache.heron.api.tuple">Tuple</a> tuple)</code></th> |
| <td class="colLast"> |
| <div class="block">Process a single tuple of input.</div> |
| </td> |
| </tr> |
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| <h3>Methods inherited from class org.apache.heron.streamlet.impl.operators.<a href="StreamletOperator.html" title="class in org.apache.heron.streamlet.impl.operators">StreamletOperator</a></h3> |
| <code><a href="StreamletOperator.html#prepare(java.util.Map,org.apache.heron.api.topology.TopologyContext,org.apache.heron.api.bolt.OutputCollector)">prepare</a></code></li> |
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| <h4>SplitOperator</h4> |
| <pre>public SplitOperator​(java.util.Map<java.lang.String,​<a href="../../SerializablePredicate.html" title="interface in org.apache.heron.streamlet">SerializablePredicate</a><<a href="SplitOperator.html" title="type parameter in SplitOperator">R</a>>> splitFns)</pre> |
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| <!-- --> |
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| <h4>execute</h4> |
| <pre class="methodSignature">public void execute​(<a href="../../../api/tuple/Tuple.html" title="interface in org.apache.heron.api.tuple">Tuple</a> tuple)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../api/bolt/IBolt.html#execute(org.apache.heron.api.tuple.Tuple)">IBolt</a></code></span></div> |
| <div class="block">Process a single tuple of input. The Tuple object contains metadata on it |
| about which component/stream/task it came from. The values of the Tuple can |
| be accessed using Tuple#getValue. The IBolt does not have to process the Tuple |
| immediately. It is perfectly fine to hang onto a tuple and process it later |
| (for instance, to do an aggregation or join). |
| <p> |
| <p>Tuples should be emitted using the OutputCollector provided through the prepare method. |
| It is required that all input tuples are acked or failed at some point using the OutputCollector. |
| Otherwise, Heron will be unable to determine when tuples coming off the spouts |
| have been completed.</p> |
| <p> |
| <p>For the common case of acking an input tuple at the end of the execute method, |
| see IBasicBolt which automates this.</p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>tuple</code> - The input tuple to be processed.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <!-- --> |
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| <h4>declareOutputFields</h4> |
| <pre class="methodSignature">public void declareOutputFields​(<a href="../../../api/topology/OutputFieldsDeclarer.html" title="interface in org.apache.heron.api.topology">OutputFieldsDeclarer</a> declarer)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="StreamletOperator.html#declareOutputFields(org.apache.heron.api.topology.OutputFieldsDeclarer)">StreamletOperator</a></code></span></div> |
| <div class="block">The operators implementing streamlet functionality have some properties. |
| 1. They all output only one stream |
| 2. They should be able to consume each other's output |
| This imply that the output stream should be named same for all of them.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../api/topology/IComponent.html#declareOutputFields(org.apache.heron.api.topology.OutputFieldsDeclarer)">declareOutputFields</a></code> in interface <code><a href="../../../api/topology/IComponent.html" title="interface in org.apache.heron.api.topology">IComponent</a></code></dd> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="StreamletOperator.html#declareOutputFields(org.apache.heron.api.topology.OutputFieldsDeclarer)">declareOutputFields</a></code> in class <code><a href="StreamletOperator.html" title="class in org.apache.heron.streamlet.impl.operators">StreamletOperator</a><<a href="SplitOperator.html" title="type parameter in SplitOperator">R</a>,​<a href="SplitOperator.html" title="type parameter in SplitOperator">R</a>></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>declarer</code> - this is used to declare output stream ids, output fields, and whether or not each output stream is a direct stream</dd> |
| </dl> |
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