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| <h2 title="Interface IUpdatable" class="title">Interface IUpdatable</h2> |
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| <pre><a href="../../classification/InterfaceAudience.Public.html" title="annotation in org.apache.heron.classification">@Public</a> |
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| public interface <span class="typeNameLabel">IUpdatable</span></pre> |
| <div class="block">Bolt or spout instances should implement this method if they wish to be informed of changed to |
| the topology context during the lifecycle of the instance. The TopologyContext is backed by |
| elements of the physical plan, which can change during a scaling event. Instances that need to |
| adapt to such changes should implement this interface to receive a callback when a change occurs.</div> |
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| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#update(org.apache.heron.api.topology.TopologyContext)">update</a></span>​(<a href="TopologyContext.html" title="interface in org.apache.heron.api.topology">TopologyContext</a> topologyContext)</code></th> |
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| <h4>update</h4> |
| <pre class="methodSignature">void update​(<a href="TopologyContext.html" title="interface in org.apache.heron.api.topology">TopologyContext</a> topologyContext)</pre> |
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