Package org.apache.beam.sdk.transforms
Class Impulse
- java.lang.Object
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- org.apache.beam.sdk.transforms.PTransform<PBegin,PCollection<byte[]>>
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- org.apache.beam.sdk.transforms.Impulse
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- All Implemented Interfaces:
java.io.Serializable
,HasDisplayData
@Internal public class Impulse extends PTransform<PBegin,PCollection<byte[]>>
For internal use only; no backwards-compatibility guarantees.A
PTransform
which produces a single empty byte array at the minimum timestamp in theGlobalWindow
.Users should instead use
Create
or anotherRead
transform to begin consuming elements.- See Also:
- Serialized Form
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Field Summary
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Fields inherited from class org.apache.beam.sdk.transforms.PTransform
name, resourceHints
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description static Impulse
create()
Create a newImpulse
PTransform
.PCollection<byte[]>
expand(PBegin input)
Override this method to specify how thisPTransform
should be expanded on the givenInputT
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Methods inherited from class org.apache.beam.sdk.transforms.PTransform
compose, compose, getAdditionalInputs, getDefaultOutputCoder, getDefaultOutputCoder, getDefaultOutputCoder, getKindString, getName, getResourceHints, populateDisplayData, setResourceHints, toString, validate, validate
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Method Detail
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create
public static Impulse create()
Create a newImpulse
PTransform
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expand
public PCollection<byte[]> expand(PBegin input)
Description copied from class:PTransform
Override this method to specify how thisPTransform
should be expanded on the givenInputT
.NOTE: This method should not be called directly. Instead apply the
PTransform
should be applied to theInputT
using theapply
method.Composite transforms, which are defined in terms of other transforms, should return the output of one of the composed transforms. Non-composite transforms, which do not apply any transforms internally, should return a new unbound output and register evaluators (via backend-specific registration methods).
- Specified by:
expand
in classPTransform<PBegin,PCollection<byte[]>>
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