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<h2 title="Interface KafkaPublisher.Preparer" class="title">Interface KafkaPublisher.Preparer</h2>
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<pre>public static interface <span class="strong">KafkaPublisher.Preparer</span></pre>
<div class="block">A Preparer for preparing to publish messages to a given topic. An instance of this class could be reused
to send more messages after <a href="../../../../../org/apache/twill/kafka/client/KafkaPublisher.Preparer.html#send()"><code>send()</code></a> is called.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<td class="colFirst"><code><a href="../../../../../org/apache/twill/kafka/client/KafkaPublisher.Preparer.html" title="interface in org.apache.twill.kafka.client">KafkaPublisher.Preparer</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/twill/kafka/client/KafkaPublisher.Preparer.html#add(java.nio.ByteBuffer,%20java.lang.Object)">add</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a>&nbsp;message,
<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;partitionKey)</code>
<div class="block">Adds the given message to the message set, partitioned with the given partition key.</div>
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<td class="colFirst"><code>com.google.common.util.concurrent.ListenableFuture&lt;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>&gt;</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/twill/kafka/client/KafkaPublisher.Preparer.html#send()">send</a></strong>()</code>
<div class="block">Sends all the messages being added through the <a href="../../../../../org/apache/twill/kafka/client/KafkaPublisher.Preparer.html#add(java.nio.ByteBuffer,%20java.lang.Object)"><code>add(java.nio.ByteBuffer, java.lang.Object)</code></a> method.</div>
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<h4>add</h4>
<pre><a href="../../../../../org/apache/twill/kafka/client/KafkaPublisher.Preparer.html" title="interface in org.apache.twill.kafka.client">KafkaPublisher.Preparer</a>&nbsp;add(<a href="http://docs.oracle.com/javase/7/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a>&nbsp;message,
<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;partitionKey)</pre>
<div class="block">Adds the given message to the message set, partitioned with the given partition key.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>message</code> - Remaining bytes in the ByteBuffer will be used as message payload. This method would
consume the ByteBuffer, meaning after this method returns, the remaining bytes in the
ByteBuffer would be <code>0</code>.</dd><dd><code>partitionKey</code> - Key for computing the partition Id to publish to. The <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang"><code>Object.hashCode()</code></a> method
will be invoke to compute the id.</dd>
<dt><span class="strong">Returns:</span></dt><dd>This <a href="../../../../../org/apache/twill/kafka/client/KafkaPublisher.Preparer.html" title="interface in org.apache.twill.kafka.client"><code>KafkaPublisher.Preparer</code></a> instance.</dd></dl>
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<h4>send</h4>
<pre>com.google.common.util.concurrent.ListenableFuture&lt;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>&gt;&nbsp;send()</pre>
<div class="block">Sends all the messages being added through the <a href="../../../../../org/apache/twill/kafka/client/KafkaPublisher.Preparer.html#add(java.nio.ByteBuffer,%20java.lang.Object)"><code>add(java.nio.ByteBuffer, java.lang.Object)</code></a> method.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>A <code>ListenableFuture</code> that will be completed when the send action is done. If publish is succeeded,
it returns number of messages published, otherwise the failure reason will be carried in the future.
The <a href="http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Future.html?is-external=true#cancel(boolean)" title="class or interface in java.util.concurrent"><code>Future.cancel(boolean)</code></a> method has no effect on the publish action.</dd></dl>
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