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| <p class="subTitle">io.gearpump.streaming.dsl.partitioner</p> |
| <h2 title="Class GroupByPartitioner" class="title">Class GroupByPartitioner<T,GROUP></h2> |
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| <dt>All Implemented Interfaces:</dt> |
| <dd>io.gearpump.partitioner.Partitioner, io.gearpump.partitioner.UnicastPartitioner, java.io.Serializable</dd> |
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| <pre>public class <strong>GroupByPartitioner<T,GROUP></strong> |
| extends java.lang.Object |
| implements io.gearpump.partitioner.UnicastPartitioner</pre> |
| <div class="block">Partition messages by applying group by function first. |
| <p> |
| param: groupBy |
| First apply message with groupBy function, then pick the hashCode of the output to do the partitioning. |
| You must define hashCode() for output type of groupBy function. |
| <p> |
| For example: |
| case class People(name: String, gender: String) |
| <p> |
| object Test{ |
| <p> |
| val groupBy: (People => String) = people => people.gender |
| val partitioner = GroupByPartitioner(groupBy) |
| }</div> |
| <dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../serialized-form.html#io.gearpump.streaming.dsl.partitioner.GroupByPartitioner">Serialized Form</a></dd></dl> |
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| <td class="colOne"><code><strong><a href="../../../../../io/gearpump/streaming/dsl/partitioner/GroupByPartitioner.html#GroupByPartitioner(scala.Function1)">GroupByPartitioner</a></strong>(scala.Function1<<a href="../../../../../io/gearpump/streaming/dsl/partitioner/GroupByPartitioner.html" title="type parameter in GroupByPartitioner">T</a>,<a href="../../../../../io/gearpump/streaming/dsl/partitioner/GroupByPartitioner.html" title="type parameter in GroupByPartitioner">GROUP</a>> groupBy)</code> </td> |
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| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><strong><a href="../../../../../io/gearpump/streaming/dsl/partitioner/GroupByPartitioner.html#getPartition(io.gearpump.Message, int, int)">getPartition</a></strong>(io.gearpump.Message msg, |
| int partitionNum, |
| int currentPartitionId)</code> </td> |
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| <code>getPartition</code></li> |
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| <h4>GroupByPartitioner</h4> |
| <pre>public GroupByPartitioner(scala.Function1<<a href="../../../../../io/gearpump/streaming/dsl/partitioner/GroupByPartitioner.html" title="type parameter in GroupByPartitioner">T</a>,<a href="../../../../../io/gearpump/streaming/dsl/partitioner/GroupByPartitioner.html" title="type parameter in GroupByPartitioner">GROUP</a>> groupBy)</pre> |
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| <h4>getPartition</h4> |
| <pre>public int getPartition(io.gearpump.Message msg, |
| int partitionNum, |
| int currentPartitionId)</pre> |
| <dl> |
| <dt><strong>Specified by:</strong></dt> |
| <dd><code>getPartition</code> in interface <code>io.gearpump.partitioner.UnicastPartitioner</code></dd> |
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