learning/katas/java/Core Transforms/DoFn Additional Parameters/DoFn Additional Parameters/task.html - beam - Git at Google

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 <html>
 <h2>DoFn Additional Parameters</h2>
 <p>
   In addition to the element and the OutputReceiver, Beam will populate other parameters to your
   DoFn’s @ProcessElement method. Any combination of these parameters can be added to your process
   method in any order.
 </p>
 <div>
   <ul>
     <li>
       <b>Timestamp</b>: To access the timestamp of an input element, add a parameter annotated with
       @Timestamp of type Instant
     </li>
     <li>
       <b>Window</b>: To access the window an input element falls into, add a parameter of the type of the
       window used for the input PCollection.
     </li>
     <li>
       <b>PaneInfo</b>: When triggers are used, Beam provides a PaneInfo object that contains information
       about the current firing. Using PaneInfo you can determine whether this is an early or a
       late firing, and how many times this window has already fired for this key.
     </li>
     <li>
       <b>PipelineOptions</b>: The PipelineOptions for the current pipeline can always be accessed in a
       process method by adding it as a parameter.
     </li>
   </ul>
 </div>
 <p>
   Refer to the Beam Programming Guide
   <a href="https://beam.apache.org/documentation/programming-guide/#other-dofn-parameters">
     "Accessing additional parameters in your DoFn"</a> section for more information.
 </p>
 </html>
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	~ or more contributor license agreements. See the NOTICE file
	~ distributed with this work for additional information
	~ regarding copyright ownership. The ASF licenses this file
	~ to you under the Apache License, Version 2.0 (the
	~ "License"); you may not use this file except in compliance
	~ with the License. You may obtain a copy of the License at
	~
	~ http://www.apache.org/licenses/LICENSE-2.0
	~
	~ Unless required by applicable law or agreed to in writing, software
	~ distributed under the License is distributed on an "AS IS" BASIS,
	~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	~ See the License for the specific language governing permissions and
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	<html>
	<h2>DoFn Additional Parameters</h2>
	<p>
	In addition to the element and the OutputReceiver, Beam will populate other parameters to your
	DoFn’s @ProcessElement method. Any combination of these parameters can be added to your process
	method in any order.
	</p>
	<div>
	<ul>
	<li>
	<b>Timestamp</b>: To access the timestamp of an input element, add a parameter annotated with
	@Timestamp of type Instant
	</li>
	<li>
	<b>Window</b>: To access the window an input element falls into, add a parameter of the type of the
	window used for the input PCollection.
	</li>
	<li>
	<b>PaneInfo</b>: When triggers are used, Beam provides a PaneInfo object that contains information
	about the current firing. Using PaneInfo you can determine whether this is an early or a
	late firing, and how many times this window has already fired for this key.
	</li>
	<li>
	<b>PipelineOptions</b>: The PipelineOptions for the current pipeline can always be accessed in a
	process method by adding it as a parameter.
	</li>
	</ul>
	</div>
	<p>
	Refer to the Beam Programming Guide
	<a href="https://beam.apache.org/documentation/programming-guide/#other-dofn-parameters">
	"Accessing additional parameters in your DoFn"</a> section for more information.
	</p>
	</html>