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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">org.apache.heron.api.topology</a></div>
<h2 title="Interface IComponent" class="title">Interface IComponent</h2>
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<dt>All Superinterfaces:</dt>
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title="class in org.apache.heron.streamlet.impl.operators">StreamletWindowOperator</a></code>, <code><a href="../../streamlet/impl/sources/SupplierSource.html" title="class in org.apache.heron.streamlet.impl.sources">SupplierSource</a></code>, <code><a href="../../resource/TestBasicBolt.html" title="class in org.apache.heron.resource">TestBasicBolt</a></code>, <code><a href="../../resource/TestBolt.html" title="class in org.apache.heron.resource">TestBolt</a></code>, <code><a href="../../resource/TestSpout.html" title="class in org.apache.heron.resource">TestSpout</a></code>, <code><a href="../../resource/TestStatefulBolt.html" title="class in org.apache.heron.resource">TestStatefulBolt</a></code>, <code><a href="../../resource/TestStatefulSpout.html" title="class in org.apache.heron.resource">TestStatefulSpout</a></code>, <code><a href="../../resource/TestTwoPhaseStatefulBolt.html" title="class in org.apache.heron.resource">TestTwoPhaseStatefulBolt</a></code>, <code><a href="../../resource/TestTwoPhaseStatefulSpout.html" title="class in org.apache.heron.resource">TestTwoPhaseStatefulSpout</a></code>, <code><a href="../../resource/TestWindowBolt.html" title="class in org.apache.heron.resource">TestWindowBolt</a></code>, <code><a href="../../streamlet/impl/operators/TransformOperator.html" title="class in org.apache.heron.streamlet.impl.operators">TransformOperator</a></code>, <code><a href="../../integration_test/common/bolt/TweetPropertyBolt.html" title="class in org.apache.heron.integration_test.common.bolt">TweetPropertyBolt</a></code>, <code><a href="../../streamlet/impl/operators/UnionOperator.html" title="class in org.apache.heron.streamlet.impl.operators">UnionOperator</a></code>, <code><a href="../../integration_test/topology/serialization/UnserializableCustomCheckBolt.html" title="class in org.apache.heron.integration_test.topology.serialization">UnserializableCustomCheckBolt</a></code>, <code><a href="../../integration_test/topology/serialization/UnserializableCustomSpout.html" title="class in org.apache.heron.integration_test.topology.serialization">UnserializableCustomSpout</a></code>, <code><a href="../bolt/WindowedBoltExecutor.html" title="class in org.apache.heron.api.bolt">WindowedBoltExecutor</a></code>, <code><a href="../../integration_test/topology/windowing/WindowTestBase.IncrementingSpout.html" title="class in org.apache.heron.integration_test.topology.windowing">WindowTestBase.IncrementingSpout</a></code>, <code><a href="../../integration_test/topology/windowing/WindowTestBase.VerificationBolt.html" title="class in org.apache.heron.integration_test.topology.windowing">WindowTestBase.VerificationBolt</a></code>, <code><a href="../../integration_test/common/bolt/WordCountBolt.html" title="class in org.apache.heron.integration_test.common.bolt">WordCountBolt</a></code>, <code><a href="../../examples/eco/WordSpout.html" title="class in org.apache.heron.examples.eco">WordSpout</a></code></dd>
</dl>
<hr>
<pre>public interface <span class="typeNameLabel">IComponent</span>
extends java.io.Serializable</pre>
<div class="block">Common methods for all possible components in a topology. This interface is used
when defining topologies using the Java API.</div>
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<h3>Method Summary</h3>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Method</th>
<th class="colLast" scope="col">Description</th>
</tr>
<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>&#8203;(<a href="OutputFieldsDeclarer.html" title="interface in org.apache.heron.api.topology">OutputFieldsDeclarer</a>&nbsp;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>java.util.Map&lt;java.lang.String,&#8203;java.lang.Object&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getComponentConfiguration()">getComponentConfiguration</a></span>()</code></th>
<td class="colLast">
<div class="block">Declare configuration specific to this component.</div>
</td>
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<h4>declareOutputFields</h4>
<pre class="methodSignature">void&nbsp;declareOutputFields&#8203;(<a href="OutputFieldsDeclarer.html" title="interface in org.apache.heron.api.topology">OutputFieldsDeclarer</a>&nbsp;declarer)</pre>
<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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<h4>getComponentConfiguration</h4>
<pre class="methodSignature">java.util.Map&lt;java.lang.String,&#8203;java.lang.Object&gt;&nbsp;getComponentConfiguration()</pre>
<div class="block">Declare configuration specific to this component. Only a subset of the "topology.*" configs can
be overridden. The component configuration can be further overridden when constructing the
topology using <a href="TopologyBuilder.html" title="class in org.apache.heron.api.topology"><code>TopologyBuilder</code></a></div>
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