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| <div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">org.apache.kafka.streams.kstream</a></div> |
| <h1 title="Interface Initializer" class="title">Interface Initializer<VA></h1> |
| </div> |
| <section class="description"> |
| <dl class="notes"> |
| <dt>Type Parameters:</dt> |
| <dd><code>VA</code> - aggregate value type</dd> |
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| <hr> |
| <pre>public interface <span class="type-name-label">Initializer<VA></span></pre> |
| <div class="block">The <code>Initializer</code> interface for creating an initial value in aggregations. |
| <code>Initializer</code> is used in combination with <a href="Aggregator.html" title="interface in org.apache.kafka.streams.kstream"><code>Aggregator</code></a>.</div> |
| <dl class="notes"> |
| <dt>See Also:</dt> |
| <dd><a href="Aggregator.html" title="interface in org.apache.kafka.streams.kstream"><code>Aggregator</code></a>, |
| <a href="KGroupedStream.html#aggregate(org.apache.kafka.streams.kstream.Initializer,org.apache.kafka.streams.kstream.Aggregator)"><code>KGroupedStream.aggregate(Initializer, Aggregator)</code></a>, |
| <a href="KGroupedStream.html#aggregate(org.apache.kafka.streams.kstream.Initializer,org.apache.kafka.streams.kstream.Aggregator,org.apache.kafka.streams.kstream.Materialized)"><code>KGroupedStream.aggregate(Initializer, Aggregator, Materialized)</code></a>, |
| <a href="TimeWindowedKStream.html#aggregate(org.apache.kafka.streams.kstream.Initializer,org.apache.kafka.streams.kstream.Aggregator)"><code>TimeWindowedKStream.aggregate(Initializer, Aggregator)</code></a>, |
| <a href="TimeWindowedKStream.html#aggregate(org.apache.kafka.streams.kstream.Initializer,org.apache.kafka.streams.kstream.Aggregator,org.apache.kafka.streams.kstream.Materialized)"><code>TimeWindowedKStream.aggregate(Initializer, Aggregator, Materialized)</code></a>, |
| <a href="SessionWindowedKStream.html#aggregate(org.apache.kafka.streams.kstream.Initializer,org.apache.kafka.streams.kstream.Aggregator,org.apache.kafka.streams.kstream.Merger)"><code>SessionWindowedKStream.aggregate(Initializer, Aggregator, Merger)</code></a>, |
| <a href="SessionWindowedKStream.html#aggregate(org.apache.kafka.streams.kstream.Initializer,org.apache.kafka.streams.kstream.Aggregator,org.apache.kafka.streams.kstream.Merger,org.apache.kafka.streams.kstream.Materialized)"><code>SessionWindowedKStream.aggregate(Initializer, Aggregator, Merger, Materialized)</code></a></dd> |
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| <td class="col-first"><code><a href="Initializer.html" title="type parameter in Initializer">VA</a></code></td> |
| <th class="col-second" scope="row"><code><span class="member-name-link"><a href="#apply()">apply</a></span>()</code></th> |
| <td class="col-last"> |
| <div class="block">Return the initial value for an aggregation.</div> |
| </td> |
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| <h3>apply</h3> |
| <div class="member-signature"><span class="return-type"><a href="Initializer.html" title="type parameter in Initializer">VA</a></span> <span class="member-name">apply</span>()</div> |
| <div class="block">Return the initial value for an aggregation.</div> |
| <dl class="notes"> |
| <dt>Returns:</dt> |
| <dd>the initial value for an aggregation</dd> |
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