org.apache.flink.streaming.api.transformations

类 SelectTransformation<T>

java.lang.Object

org.apache.flink.api.dag.Transformation<T>

org.apache.flink.streaming.api.transformations.SelectTransformation<T>

类型参数:

T - The type of the elements that result from this SelectTransformation

@Internal
public class SelectTransformation<T>
extends org.apache.flink.api.dag.Transformation<T>

This transformation represents a selection of only certain upstream elements. This must follow a SplitTransformation that splits elements into several logical streams with assigned names.

This does not create a physical operation, it only affects how upstream operations are connected to downstream operations.

字段概要

从类继承的字段 org.apache.flink.api.dag.Transformation

bufferTimeout, DEFAULT_MANAGED_MEMORY_WEIGHT, id, idCounter, name, outputType, typeUsed, UPPER_BOUND_MAX_PARALLELISM

构造器概要

构造器

构造器和说明
SelectTransformation(org.apache.flink.api.dag.Transformation<T> input, List<String> selectedNames) Creates a new SelectionTransformation from the given input that only selects the streams with the selected names.

方法概要

限定符和类型	方法和说明
org.apache.flink.api.dag.Transformation<T>	getInput() Returns the input Transformation.
List<String>	getSelectedNames() Returns the names of the split streams that this SelectTransformation selects.
Collection<org.apache.flink.api.dag.Transformation<?>>	getTransitivePredecessors()

从类继承的方法 org.apache.flink.api.dag.Transformation

equals, getBufferTimeout, getCoLocationGroupKey, getId, getManagedMemoryWeight, getMaxParallelism, getMinResources, getName, getNewNodeId, getOutputType, getParallelism, getPreferredResources, getSlotSharingGroup, getUid, getUserProvidedNodeHash, hashCode, setBufferTimeout, setCoLocationGroupKey, setManagedMemoryWeight, setMaxParallelism, setName, setOutputType, setParallelism, setResources, setSlotSharingGroup, setUid, setUidHash, toString

从类继承的方法 java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

构造器详细资料

SelectTransformation

public SelectTransformation(org.apache.flink.api.dag.Transformation<T> input,
                            List<String> selectedNames)

Creates a new SelectionTransformation from the given input that only selects the streams with the selected names.

参数:

input - The input Transformation

selectedNames - The names from the upstream SplitTransformation that this SelectTransformation selects.

方法详细资料

getInput

public org.apache.flink.api.dag.Transformation<T> getInput()

Returns the input Transformation.

getSelectedNames

public List<String> getSelectedNames()

Returns the names of the split streams that this SelectTransformation selects.

getTransitivePredecessors

public Collection<org.apache.flink.api.dag.Transformation<?>> getTransitivePredecessors()

指定者:

getTransitivePredecessors 在类中 org.apache.flink.api.dag.Transformation<T>