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| <div class="subTitle">org.apache.edgent.connectors.kafka</div> |
| <h2 title="Class KafkaProducer" class="title">Class KafkaProducer</h2> |
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| <pre>public class <span class="typeNameLabel">KafkaProducer</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>KafkaProducer</code> is a connector for publishing a stream of tuples |
| 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 bootstrapServers = "localhost:9092"; |
| String topic = "mySensorReadingsTopic"; |
| |
| Map<String,Object> config = new HashMap<>(); |
| config.put("bootstrap.servers", bootstrapServers); |
| |
| Topology t = ... |
| KafkaProducer kafka = new KafkaProducer(t, () -> config); |
| |
| TStream<JsonObject> sensorReadings = t.poll( |
| () -> getSensorReading(), 5, TimeUnit.SECONDS); |
| |
| // publish as sensor readings as JSON |
| kafka.publish(sensonReadings, tuple -> tuple.toString(), topic); |
| </code></pre></div> |
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| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/kafka/KafkaProducer.html#KafkaProducer-org.apache.edgent.topology.Topology-org.apache.edgent.function.Supplier-">KafkaProducer</a></span>(<a href="../../../../../org/apache/edgent/topology/Topology.html" title="interface in org.apache.edgent.topology">Topology</a> t, |
| <a href="../../../../../org/apache/edgent/function/Supplier.html" title="interface in org.apache.edgent.function">Supplier</a><<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><<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>>> config)</code> |
| <div class="block">Create a producer connector for publishing tuples to Kafka topics.s</div> |
| </td> |
| </tr> |
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| </li> |
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| <th class="colLast" scope="col">Method and Description</th> |
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| <td class="colFirst"><code><a href="../../../../../org/apache/edgent/topology/TSink.html" title="interface in org.apache.edgent.topology">TSink</a><<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>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/connectors/kafka/KafkaProducer.html#publish-org.apache.edgent.topology.TStream-java.lang.String-">publish</a></span>(<a href="../../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a><<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>> stream, |
| <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> topic)</code> |
| <div class="block">Publish the stream of tuples as Kafka key/value records |
| to the specified partitions of the specified topics.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><T> <a href="../../../../../org/apache/edgent/topology/TSink.html" title="interface in org.apache.edgent.topology">TSink</a><T></code></td> |
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| <a href="../../../../../org/apache/edgent/function/Function.html" title="interface in org.apache.edgent.function">Function</a><T,<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>> valueFn, |
| <a href="../../../../../org/apache/edgent/function/Function.html" title="interface in org.apache.edgent.function">Function</a><T,<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>> topicFn, |
| <a href="../../../../../org/apache/edgent/function/Function.html" title="interface in org.apache.edgent.function">Function</a><T,<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> partitionFn)</code> |
| <div class="block">Publish the stream of tuples as Kafka key/value records |
| to the specified partitions of the specified topics.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><T> <a href="../../../../../org/apache/edgent/topology/TSink.html" title="interface in org.apache.edgent.topology">TSink</a><T></code></td> |
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| <a href="../../../../../org/apache/edgent/function/Function.html" title="interface in org.apache.edgent.function">Function</a><T,byte[]> keyFn, |
| <a href="../../../../../org/apache/edgent/function/Function.html" title="interface in org.apache.edgent.function">Function</a><T,byte[]> valueFn, |
| <a href="../../../../../org/apache/edgent/function/Function.html" title="interface in org.apache.edgent.function">Function</a><T,<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>> topicFn, |
| <a href="../../../../../org/apache/edgent/function/Function.html" title="interface in org.apache.edgent.function">Function</a><T,<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> partitionFn)</code> |
| <div class="block">Publish the stream of tuples as Kafka key/value records |
| to the specified topic partitions.</div> |
| </td> |
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| <h4>KafkaProducer</h4> |
| <pre>public KafkaProducer(<a href="../../../../../org/apache/edgent/topology/Topology.html" title="interface in org.apache.edgent.topology">Topology</a> t, |
| <a href="../../../../../org/apache/edgent/function/Supplier.html" title="interface in org.apache.edgent.function">Supplier</a><<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><<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>>> config)</pre> |
| <div class="block">Create a producer connector for publishing tuples to Kafka topics.s |
| <p> |
| See the Apache Kafka documentation for <code>KafkaProducer</code> |
| configuration properties at <a href="http://kafka.apache.org">http://kafka.apache.org</a>. |
| Configuration property values are strings. |
| <p> |
| The Kafka "New Producer configs" are used. Minimal configuration |
| typically includes: |
| <ul> |
| <li><code>bootstrap.servers</code></li> |
| </ul> |
| <p> |
| The full set of producer configuration items are specified in |
| <code>org.apache.kafka.clients.producer.ProducerConfig</code></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>t</code> - Topology to add to</dd> |
| <dd><code>config</code> - KafkaProducer configuration information.</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <!-- ============ METHOD DETAIL ========== --> |
| <ul class="blockList"> |
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| </a> |
| <h3>Method Detail</h3> |
| <a name="publishBytes-org.apache.edgent.topology.TStream-org.apache.edgent.function.Function-org.apache.edgent.function.Function-org.apache.edgent.function.Function-org.apache.edgent.function.Function-"> |
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| <h4>publishBytes</h4> |
| <pre>public <T> <a href="../../../../../org/apache/edgent/topology/TSink.html" title="interface in org.apache.edgent.topology">TSink</a><T> publishBytes(<a href="../../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a><T> stream, |
| <a href="../../../../../org/apache/edgent/function/Function.html" title="interface in org.apache.edgent.function">Function</a><T,byte[]> keyFn, |
| <a href="../../../../../org/apache/edgent/function/Function.html" title="interface in org.apache.edgent.function">Function</a><T,byte[]> valueFn, |
| <a href="../../../../../org/apache/edgent/function/Function.html" title="interface in org.apache.edgent.function">Function</a><T,<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>> topicFn, |
| <a href="../../../../../org/apache/edgent/function/Function.html" title="interface in org.apache.edgent.function">Function</a><T,<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> partitionFn)</pre> |
| <div class="block">Publish the stream of tuples as Kafka key/value records |
| to the specified topic partitions. |
| <p> |
| If a valid partition number is specified that partition will be used |
| when sending the message. If no partition is specified but a key is |
| present a partition will be chosen using a hash of the key. |
| If neither key nor partition is present a partition will be assigned |
| in a round-robin fashion.</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>stream</code> - the stream to publish</dd> |
| <dd><code>keyFn</code> - A function that yields an optional byte[] |
| Kafka record's key from the tuple. |
| Specify null or return a null value for no key.</dd> |
| <dd><code>valueFn</code> - A function that yields the byte[] |
| Kafka record's value from the tuple.</dd> |
| <dd><code>topicFn</code> - A function that yields the topic from the tuple.</dd> |
| <dd><code>partitionFn</code> - A function that yields the optional topic |
| partition specification from the tuple. |
| Specify null or return a null value for no partition specification.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd><a href="../../../../../org/apache/edgent/topology/TSink.html" title="interface in org.apache.edgent.topology"><code>TSink</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="publish-org.apache.edgent.topology.TStream-org.apache.edgent.function.Function-org.apache.edgent.function.Function-org.apache.edgent.function.Function-org.apache.edgent.function.Function-"> |
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| <h4>publish</h4> |
| <pre>public <T> <a href="../../../../../org/apache/edgent/topology/TSink.html" title="interface in org.apache.edgent.topology">TSink</a><T> publish(<a href="../../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a><T> stream, |
| <a href="../../../../../org/apache/edgent/function/Function.html" title="interface in org.apache.edgent.function">Function</a><T,<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>> keyFn, |
| <a href="../../../../../org/apache/edgent/function/Function.html" title="interface in org.apache.edgent.function">Function</a><T,<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>> valueFn, |
| <a href="../../../../../org/apache/edgent/function/Function.html" title="interface in org.apache.edgent.function">Function</a><T,<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>> topicFn, |
| <a href="../../../../../org/apache/edgent/function/Function.html" title="interface in org.apache.edgent.function">Function</a><T,<a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> partitionFn)</pre> |
| <div class="block">Publish the stream of tuples as Kafka key/value records |
| to the specified partitions of the specified topics. |
| <p> |
| This is a convenience method for <code>String</code> typed key/value |
| conversion functions. |
| <p></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>stream</code> - the stream to publish</dd> |
| <dd><code>keyFn</code> - A function that yields an optional String |
| Kafka record's key from the tuple. |
| Specify null or return a null value for no key.</dd> |
| <dd><code>valueFn</code> - A function that yields the String for the |
| Kafka record's value from the tuple.</dd> |
| <dd><code>topicFn</code> - A function that yields the topic from the tuple.</dd> |
| <dd><code>partitionFn</code> - A function that yields the optional topic |
| partition specification from the tuple. |
| Specify null or return a null value for no partition specification.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd><a href="../../../../../org/apache/edgent/topology/TSink.html" title="interface in org.apache.edgent.topology"><code>TSink</code></a></dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../org/apache/edgent/connectors/kafka/KafkaProducer.html#publishBytes-org.apache.edgent.topology.TStream-org.apache.edgent.function.Function-org.apache.edgent.function.Function-org.apache.edgent.function.Function-org.apache.edgent.function.Function-"><code>publishBytes(TStream, Function, Function, Function, Function)</code></a></dd> |
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| <a name="publish-org.apache.edgent.topology.TStream-java.lang.String-"> |
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| <h4>publish</h4> |
| <pre>public <a href="../../../../../org/apache/edgent/topology/TSink.html" title="interface in org.apache.edgent.topology">TSink</a><<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>> publish(<a href="../../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a><<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>> stream, |
| <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> topic)</pre> |
| <div class="block">Publish the stream of tuples as Kafka key/value records |
| to the specified partitions of the specified topics. |
| <p> |
| This is a convenience method for a String stream published |
| as a Kafka record with no key and |
| a value consisting of the String tuple serialized as UTF-8, |
| and publishing round-robin to a fixed topic's partitions.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>stream</code> - the stream to publish</dd> |
| <dd><code>topic</code> - The topic to publish to</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd><a href="../../../../../org/apache/edgent/topology/TSink.html" title="interface in org.apache.edgent.topology"><code>TSink</code></a></dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../org/apache/edgent/connectors/kafka/KafkaProducer.html#publish-org.apache.edgent.topology.TStream-org.apache.edgent.function.Function-org.apache.edgent.function.Function-org.apache.edgent.function.Function-org.apache.edgent.function.Function-"><code>publish(TStream, Function, Function, Function, Function)</code></a></dd> |
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