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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.heron.examples.eco</a></div> |
| <h2 title="Class WordSpout" class="title">Class WordSpout</h2> |
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| <li>java.lang.Object</li> |
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| <li><a href="../../api/spout/BaseRichSpout.html" title="class in org.apache.heron.api.spout">org.apache.heron.api.spout.BaseRichSpout</a></li> |
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| <dt>All Implemented Interfaces:</dt> |
| <dd><code>java.io.Serializable</code>, <code><a href="../../api/spout/IRichSpout.html" title="interface in org.apache.heron.api.spout">IRichSpout</a></code>, <code><a href="../../api/spout/ISpout.html" title="interface in org.apache.heron.api.spout">ISpout</a></code>, <code><a href="../../api/topology/IComponent.html" title="interface in org.apache.heron.api.topology">IComponent</a></code></dd> |
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| <hr> |
| <pre>public class <span class="typeNameLabel">WordSpout</span> |
| extends <a href="../../api/spout/BaseRichSpout.html" title="class in org.apache.heron.api.spout">BaseRichSpout</a></pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../serialized-form.html#org.apache.heron.examples.eco.WordSpout">Serialized Form</a></dd> |
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| <th class="colFirst" scope="col">Constructor</th> |
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| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">WordSpout</a></span>()</code></th> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#declareOutputFields(org.apache.heron.api.topology.OutputFieldsDeclarer)">declareOutputFields</a></span>​(<a href="../../api/topology/OutputFieldsDeclarer.html" title="interface in org.apache.heron.api.topology">OutputFieldsDeclarer</a> outputFieldsDeclarer)</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="#nextTuple()">nextTuple</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">When this method is called, Heron is requesting that the Spout emit tuples to the |
| output collector.</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="#open(java.util.Map,org.apache.heron.api.topology.TopologyContext,org.apache.heron.api.spout.SpoutOutputCollector)">open</a></span>​(java.util.Map map, |
| <a href="../../api/topology/TopologyContext.html" title="interface in org.apache.heron.api.topology">TopologyContext</a> topologyContext, |
| <a href="../../api/spout/SpoutOutputCollector.html" title="class in org.apache.heron.api.spout">SpoutOutputCollector</a> spoutOutputCollector)</code></th> |
| <td class="colLast"> |
| <div class="block">Called when a task for this component is initialized within a worker on the cluster.</div> |
| </td> |
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| <h3>Methods inherited from class org.apache.heron.api.spout.<a href="../../api/spout/BaseRichSpout.html" title="class in org.apache.heron.api.spout">BaseRichSpout</a></h3> |
| <code><a href="../../api/spout/BaseRichSpout.html#ack(java.lang.Object)">ack</a>, <a href="../../api/spout/BaseRichSpout.html#activate()">activate</a>, <a href="../../api/spout/BaseRichSpout.html#close()">close</a>, <a href="../../api/spout/BaseRichSpout.html#deactivate()">deactivate</a>, <a href="../../api/spout/BaseRichSpout.html#fail(java.lang.Object)">fail</a></code></li> |
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| <code><a href="../../api/topology/BaseComponent.html#getComponentConfiguration()">getComponentConfiguration</a></code></li> |
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| <code><a href="../../api/topology/IComponent.html#getComponentConfiguration()">getComponentConfiguration</a></code></li> |
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| <h4>WordSpout</h4> |
| <pre>public WordSpout()</pre> |
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| <h4>declareOutputFields</h4> |
| <pre class="methodSignature">public void declareOutputFields​(<a href="../../api/topology/OutputFieldsDeclarer.html" title="interface in org.apache.heron.api.topology">OutputFieldsDeclarer</a> outputFieldsDeclarer)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../api/topology/IComponent.html#declareOutputFields(org.apache.heron.api.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>outputFieldsDeclarer</code> - this is used to declare output stream ids, output fields, and whether or not each output stream is a direct stream</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="open(java.util.Map,org.apache.heron.api.topology.TopologyContext,org.apache.heron.api.spout.SpoutOutputCollector)"> |
| <!-- --> |
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| <h4>open</h4> |
| <pre class="methodSignature">public void open​(java.util.Map map, |
| <a href="../../api/topology/TopologyContext.html" title="interface in org.apache.heron.api.topology">TopologyContext</a> topologyContext, |
| <a href="../../api/spout/SpoutOutputCollector.html" title="class in org.apache.heron.api.spout">SpoutOutputCollector</a> spoutOutputCollector)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../api/spout/ISpout.html#open(java.util.Map,org.apache.heron.api.topology.TopologyContext,org.apache.heron.api.spout.SpoutOutputCollector)">ISpout</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 spout with the environment in which the spout executes. |
| <p> |
| <p>This includes the:</p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>map</code> - The Heron configuration for this spout. This is the configuration provided to the topology merged in with cluster configuration on this machine.</dd> |
| <dd><code>topologyContext</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>spoutOutputCollector</code> - The collector is used to emit tuples from this spout. Tuples can be emitted at any time, including the open and close methods. The collector is thread-safe and should be saved as an instance variable of this spout object.</dd> |
| </dl> |
| </li> |
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| <a id="nextTuple()"> |
| <!-- --> |
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| <h4>nextTuple</h4> |
| <pre class="methodSignature">public void nextTuple()</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../api/spout/ISpout.html#nextTuple()">ISpout</a></code></span></div> |
| <div class="block">When this method is called, Heron is requesting that the Spout emit tuples to the |
| output collector. This method should be non-blocking, so if the Spout has no tuples |
| to emit, this method should return. nextTuple, ack, and fail are all called in a tight |
| loop in a single thread in the spout task. When there are no tuples to emit, it is courteous |
| to have nextTuple sleep for a short amount of time (like a single millisecond) |
| so as not to waste too much CPU.</div> |
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