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<div class="subTitle">org.apache.edgent.connectors.kafka</div>
<h2 title="Class KafkaConsumer" class="title">Class KafkaConsumer</h2>
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<pre>public class <span class="typeNameLabel">KafkaConsumer</span>
extends <a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<div class="block"><code>KafkaConsumer</code> is a connector for creating a stream of tuples
by subscribing to Apache Kafka messaging system topics.
<p>
The connector uses and includes components from the Kafka 0.8.2.2 release.
It has been successfully tested against kafka_2.11-0.10.1.0 and kafka_2.11-0.9.0.0 server as well.
For more information about Kafka see
<a href="http://kafka.apache.org">http://kafka.apache.org</a>
<p>
Sample use:
<pre><code>
String zookeeperConnect = "localhost:2181";
String groupId = "myGroupId";
String topic = "mySensorReadingsTopic";
Map&lt;String,Object&gt; config = new HashMap&lt;&gt;();
config.put("zookeeper.connect", zookeeperConnect);
config.put("groupId", groupId);
Topology t = ...
KafkaConsumer kafka = new KafkaConsumer(t, () -&gt; config);
// subscribe to a topic where sensor readings are published as JSON,
// creating a stream of JSON tuples
TStream&lt;String&gt; sensorReadingsJson =
kafka.subscribe(rec -&gt; rec.value(), topic);
// print the received messages
sensorReadingsJson.print();
</code></pre></div>
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<td class="colFirst"><code>static interface&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/kafka/KafkaConsumer.ByteConsumerRecord.html" title="interface in org.apache.edgent.connectors.kafka">KafkaConsumer.ByteConsumerRecord</a></span></code>
<div class="block">A Kafka record with byte[] typed key and value members</div>
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<td class="colFirst"><code>static interface&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/kafka/KafkaConsumer.ConsumerRecord.html" title="interface in org.apache.edgent.connectors.kafka">KafkaConsumer.ConsumerRecord</a>&lt;<a href="../../../../../org/apache/edgent/connectors/kafka/KafkaConsumer.ConsumerRecord.html" title="type parameter in KafkaConsumer.ConsumerRecord">K</a>,<a href="../../../../../org/apache/edgent/connectors/kafka/KafkaConsumer.ConsumerRecord.html" title="type parameter in KafkaConsumer.ConsumerRecord">V</a>&gt;</span></code>
<div class="block">A received Kafka record</div>
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<td class="colFirst"><code>static interface&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/kafka/KafkaConsumer.StringConsumerRecord.html" title="interface in org.apache.edgent.connectors.kafka">KafkaConsumer.StringConsumerRecord</a></span></code>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/kafka/KafkaConsumer.html#KafkaConsumer-org.apache.edgent.topology.Topology-org.apache.edgent.function.Supplier-">KafkaConsumer</a></span>(<a href="../../../../../org/apache/edgent/topology/Topology.html" title="interface in org.apache.edgent.topology">Topology</a>&nbsp;t,
<a href="../../../../../org/apache/edgent/function/Supplier.html" title="interface in org.apache.edgent.function">Supplier</a>&lt;<a href="http://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>,<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&gt;&gt;&nbsp;config)</code>
<div class="block">Create a consumer connector for subscribing to Kafka topics
and creating tuples from the received messages.</div>
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<td class="colFirst"><code>&lt;T&gt;&nbsp;<a href="../../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a>&lt;T&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/kafka/KafkaConsumer.html#subscribe-org.apache.edgent.function.Function-java.lang.String...-">subscribe</a></span>(<a href="../../../../../org/apache/edgent/function/Function.html" title="interface in org.apache.edgent.function">Function</a>&lt;<a href="../../../../../org/apache/edgent/connectors/kafka/KafkaConsumer.StringConsumerRecord.html" title="interface in org.apache.edgent.connectors.kafka">KafkaConsumer.StringConsumerRecord</a>,T&gt;&nbsp;toTupleFn,
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<div class="block">Subscribe to the specified topics and yield a stream of tuples
from the published Kafka records.</div>
</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>&lt;T&gt;&nbsp;<a href="../../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a>&lt;T&gt;</code></td>
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<div class="block">Subscribe to the specified topics and yield a stream of tuples
from the published Kafka records.</div>
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<h4>KafkaConsumer</h4>
<pre>public&nbsp;KafkaConsumer(<a href="../../../../../org/apache/edgent/topology/Topology.html" title="interface in org.apache.edgent.topology">Topology</a>&nbsp;t,
<a href="../../../../../org/apache/edgent/function/Supplier.html" title="interface in org.apache.edgent.function">Supplier</a>&lt;<a href="http://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a>&lt;<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>,<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&gt;&gt;&nbsp;config)</pre>
<div class="block">Create a consumer connector for subscribing to Kafka topics
and creating tuples from the received messages.
<p>
See the Apache Kafka documentation for "Old Consumer Configs"
configuration properties at <a href="http://kafka.apache.org">http://kafka.apache.org</a>.
Configuration property values are strings.
<p>
The Kafka "Old Consumer" configs are used. Minimal configuration
typically includes:
<ul>
<li><code>zookeeper.connect</code></li>
<li><code>group.id</code></li>
</ul></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>t</code> - Topology to add to</dd>
<dd><code>config</code> - KafkaConsumer configuration information.</dd>
</dl>
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<h4>subscribeBytes</h4>
<pre>public&nbsp;&lt;T&gt;&nbsp;<a href="../../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a>&lt;T&gt;&nbsp;subscribeBytes(<a href="../../../../../org/apache/edgent/function/Function.html" title="interface in org.apache.edgent.function">Function</a>&lt;<a href="../../../../../org/apache/edgent/connectors/kafka/KafkaConsumer.ByteConsumerRecord.html" title="interface in org.apache.edgent.connectors.kafka">KafkaConsumer.ByteConsumerRecord</a>,T&gt;&nbsp;toTupleFn,
<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>...&nbsp;topics)</pre>
<div class="block">Subscribe to the specified topics and yield a stream of tuples
from the published Kafka records.
<p>
Kafka's consumer group management functionality is used to automatically
allocate, and dynamically reallocate, the topic's partitions to this connector.
<p>
In line with Kafka's evolving new KafkaConsumer interface, subscribing
to a topic advertises a single thread to the server for partition allocation.
<p>
Currently, subscribe*() can only be called once for a KafkaConsumer
instance. This restriction will be removed once we migrate to Kafka 0.9.0.0.</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>T</code> - tuple type</dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>toTupleFn</code> - A function that yields a tuple from a <code>ByteConsumerRecord</code></dd>
<dd><code>topics</code> - the topics to subscribe to.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>stream of tuples</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - for a duplicate or conflicting subscription</dd>
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<h4>subscribe</h4>
<pre>public&nbsp;&lt;T&gt;&nbsp;<a href="../../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a>&lt;T&gt;&nbsp;subscribe(<a href="../../../../../org/apache/edgent/function/Function.html" title="interface in org.apache.edgent.function">Function</a>&lt;<a href="../../../../../org/apache/edgent/connectors/kafka/KafkaConsumer.StringConsumerRecord.html" title="interface in org.apache.edgent.connectors.kafka">KafkaConsumer.StringConsumerRecord</a>,T&gt;&nbsp;toTupleFn,
<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>...&nbsp;topics)</pre>
<div class="block">Subscribe to the specified topics and yield a stream of tuples
from the published Kafka records.
<p>
Kafka's consumer group management functionality is used to automatically
allocate, and dynamically reallocate, the topic's partitions to this connector.
<p>
In line with Kafka's evolving new KafkaConsumer interface, subscribing
to a topic advertises a single thread to the server for partition allocation.
<p>
Currently, subscribe*() can only be called once for a KafkaConsumer
instance. This restriction will be removed once we migrate to Kafka 0.9.0.0.</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>T</code> - tuple type</dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>toTupleFn</code> - A function that yields a tuple from a <code>StringConsumerRecord</code></dd>
<dd><code>topics</code> - the topics to subscribe to.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>stream of tuples</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - for a duplicate or conflicting subscription</dd>
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