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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.storm.starter</a></div> |
| <h2 title="Class ExclamationTopology.ExclamationBolt" class="title">Class ExclamationTopology.ExclamationBolt</h2> |
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| <li>java.lang.Object</li> |
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| <li><a href="../topology/base/BaseRichBolt.html" title="class in org.apache.storm.topology.base">org.apache.storm.topology.base.BaseRichBolt</a></li> |
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| <dd><code>java.io.Serializable</code>, <code><a href="../task/IBolt.html" title="interface in org.apache.storm.task">IBolt</a></code>, <code><a href="../topology/IComponent.html" title="interface in org.apache.storm.topology">IComponent</a></code>, <code><a href="../topology/IRichBolt.html" title="interface in org.apache.storm.topology">IRichBolt</a></code></dd> |
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| <dt>Enclosing class:</dt> |
| <dd><a href="ExclamationTopology.html" title="class in org.apache.storm.starter">ExclamationTopology</a></dd> |
| </dl> |
| <hr> |
| <pre>public static class <span class="typeNameLabel">ExclamationTopology.ExclamationBolt</span> |
| extends <a href="../topology/base/BaseRichBolt.html" title="class in org.apache.storm.topology.base">BaseRichBolt</a></pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../serialized-form.html#org.apache.storm.starter.ExclamationTopology.ExclamationBolt">Serialized Form</a></dd> |
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| <tr class="altColor"> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">ExclamationBolt</a></span>()</code></th> |
| <td class="colLast"> </td> |
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| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#declareOutputFields(org.apache.storm.topology.OutputFieldsDeclarer)">declareOutputFields</a></span>​(<a href="../topology/OutputFieldsDeclarer.html" title="interface in org.apache.storm.topology">OutputFieldsDeclarer</a> declarer)</code></th> |
| <td class="colLast"> |
| <div class="block">Declare the output schema for all the streams of this topology.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#execute(org.apache.storm.tuple.Tuple)">execute</a></span>​(<a href="../tuple/Tuple.html" title="interface in org.apache.storm.tuple">Tuple</a> tuple)</code></th> |
| <td class="colLast"> |
| <div class="block">Process a single tuple of input.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#prepare(java.util.Map,org.apache.storm.task.TopologyContext,org.apache.storm.task.OutputCollector)">prepare</a></span>​(java.util.Map<java.lang.String,​java.lang.Object> conf, |
| <a href="../task/TopologyContext.html" title="class in org.apache.storm.task">TopologyContext</a> context, |
| <a href="../task/OutputCollector.html" title="class in org.apache.storm.task">OutputCollector</a> c)</code></th> |
| <td class="colLast"> |
| <div class="block">Called when a task for this component is initialized within a worker on the cluster.</div> |
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| <h3>Methods inherited from class org.apache.storm.topology.base.<a href="../topology/base/BaseRichBolt.html" title="class in org.apache.storm.topology.base">BaseRichBolt</a></h3> |
| <code><a href="../topology/base/BaseRichBolt.html#cleanup()">cleanup</a></code></li> |
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| <code><a href="../topology/base/BaseComponent.html#getComponentConfiguration()">getComponentConfiguration</a></code></li> |
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| <code><a href="../topology/IComponent.html#getComponentConfiguration()">getComponentConfiguration</a></code></li> |
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| <h4>ExclamationBolt</h4> |
| <pre>public ExclamationBolt()</pre> |
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| <a id="prepare(java.util.Map,org.apache.storm.task.TopologyContext,org.apache.storm.task.OutputCollector)"> |
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| <h4>prepare</h4> |
| <pre class="methodSignature">public void prepare​(java.util.Map<java.lang.String,​java.lang.Object> conf, |
| <a href="../task/TopologyContext.html" title="class in org.apache.storm.task">TopologyContext</a> context, |
| <a href="../task/OutputCollector.html" title="class in org.apache.storm.task">OutputCollector</a> c)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../task/IBolt.html#prepare(java.util.Map,org.apache.storm.task.TopologyContext,org.apache.storm.task.OutputCollector)">IBolt</a></code></span></div> |
| <div class="block">Called when a task for this component is initialized within a worker on the cluster. |
| It provides the bolt with the environment in which the bolt executes. |
| <p> |
| <p>This includes the:</p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - The Storm configuration for this bolt. This is the configuration provided to the topology merged in with cluster configuration on this machine.</dd> |
| <dd><code>context</code> - This object can be used to get information about this task's place within the topology, including the task id and component id of this task, input and output information, etc.</dd> |
| <dd><code>c</code> - The collector is used to emit tuples from this bolt. Tuples can be emitted at any time, including the prepare and cleanup methods. The collector is thread-safe and should be saved as an instance variable of this bolt object.</dd> |
| </dl> |
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| <h4>execute</h4> |
| <pre class="methodSignature">public void execute​(<a href="../tuple/Tuple.html" title="interface in org.apache.storm.tuple">Tuple</a> tuple)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../task/IBolt.html#execute(org.apache.storm.tuple.Tuple)">IBolt</a></code></span></div> |
| <div class="block">Process a single tuple of input. The Tuple object contains metadata on it |
| about which component/stream/task it came from. The values of the Tuple can |
| be accessed using Tuple#getValue. The IBolt does not have to process the Tuple |
| immediately. It is perfectly fine to hang onto a tuple and process it later |
| (for instance, to do an aggregation or join). |
| <p> |
| <p>Tuples should be emitted using the OutputCollector provided through the prepare method. |
| It is required that all input tuples are acked or failed at some point using the OutputCollector. |
| Otherwise, Storm will be unable to determine when tuples coming off the spouts |
| have been completed.</p> |
| <p> |
| <p>For the common case of acking an input tuple at the end of the execute method, |
| see IBasicBolt which automates this.</p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>tuple</code> - The input tuple to be processed.</dd> |
| </dl> |
| </li> |
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| <h4>declareOutputFields</h4> |
| <pre class="methodSignature">public void declareOutputFields​(<a href="../topology/OutputFieldsDeclarer.html" title="interface in org.apache.storm.topology">OutputFieldsDeclarer</a> declarer)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../topology/IComponent.html#declareOutputFields(org.apache.storm.topology.OutputFieldsDeclarer)">IComponent</a></code></span></div> |
| <div class="block">Declare the output schema for all the streams of this topology.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>declarer</code> - this is used to declare output stream ids, output fields, and whether or not each output stream is a direct stream</dd> |
| </dl> |
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