Package org.apache.wayang.jdbc.operators

Class SqlToStreamOperator

java.lang.Object

org.apache.wayang.core.plan.wayangplan.OperatorBase

org.apache.wayang.core.plan.wayangplan.UnaryToUnaryOperator<Record,Record>

org.apache.wayang.jdbc.operators.SqlToStreamOperator

All Implemented Interfaces:

Serializable, ActualOperator, ElementaryOperator, ExecutionOperator, Operator, JsonSerializable, JavaExecutionOperator

public class SqlToStreamOperator
extends UnaryToUnaryOperator<Record,Record>
implements JavaExecutionOperator, JsonSerializable

This Operator converts SqlQueryChannels to StreamChannels.

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	SqlToStreamOperator.ResultSetIterator	Exposes a ResultSet as an Iterator.

Nested classes/interfaces inherited from class org.apache.wayang.core.plan.wayangplan.OperatorBase

OperatorBase.GsonSerializer

Nested classes/interfaces inherited from interface org.apache.wayang.core.util.JsonSerializable

JsonSerializable.Serializer<T extends JsonSerializable>

Field Summary

Fields inherited from class org.apache.wayang.core.plan.wayangplan.OperatorBase

inputSlots, outputSlots, STANDARD_OPERATOR_ARGS

Fields inherited from interface org.apache.wayang.core.util.JsonSerializable

uncheckedSerializer

Fields inherited from interface org.apache.wayang.core.plan.wayangplan.Operator

FIRST_EPOCH

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	SqlToStreamOperator(SqlToStreamOperator that)
	SqlToStreamOperator(JdbcPlatformTemplate jdbcPlatform)	Creates a new instance.
	SqlToStreamOperator(JdbcPlatformTemplate jdbcPlatform, DataSetType<Record> dataSetType)	Creates a new instance.

Method Summary

Modifier and Type	Method	Description
Tuple<Collection<ExecutionLineageNode>,Collection<ChannelInstance>>	evaluate(ChannelInstance[] inputs, ChannelInstance[] outputs, JavaExecutor executor, OptimizationContext.OperatorContext operatorContext)	Evaluates this operator.
static SqlToStreamOperator	fromJson(WayangJsonObj wayangJsonObj)
Collection<String>	getLoadProfileEstimatorConfigurationKeys()	Provide the Configuration keys for the LoadProfileEstimator specification of this instance.
List<ChannelDescriptor>	getSupportedInputChannels(int index)	Display the supported Channels for a certain InputSlot.
List<ChannelDescriptor>	getSupportedOutputChannels(int index)	Display the supported Channels for a certain OutputSlot.
WayangJsonObj	toJson()	Convert this instance to a WayangJsonObj.

Methods inherited from class org.apache.wayang.core.plan.wayangplan.UnaryToUnaryOperator

getInput, getInputType, getOutput, getOutputType

Methods inherited from class org.apache.wayang.core.plan.wayangplan.OperatorBase

accept, addBroadcastInput, addTargetPlatform, at, collectMappedInputSlots, collectMappedOutputSlots, copy, createCopy, getAllInputs, getAllOutputs, getCardinalityEstimator, getContainer, getEpoch, getName, getOriginal, getSimpleClassName, getTargetPlatforms, isAuxiliary, isSupportingBroadcastInputs, propagateInputCardinality, propagateOutputCardinality, setAuxiliary, setCardinalityEstimator, setContainer, setEpoch, setName, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.wayang.core.plan.wayangplan.ActualOperator

accept

Methods inherited from interface org.apache.wayang.core.plan.wayangplan.ElementaryOperator

createCardinalityEstimator, getCardinalityEstimator, isAuxiliary, setAuxiliary, setCardinalityEstimator

Methods inherited from interface org.apache.wayang.core.plan.wayangplan.ExecutionOperator

copy, createLoadProfileEstimator, createOutputChannelInstances, getLimitBaseKey, getLoadProfileEstimatorConfigurationKey, getOriginal, getOutputChannelDescriptor, isFiltered

Methods inherited from interface org.apache.wayang.java.operators.JavaExecutionOperator

getPlatform

Methods inherited from interface org.apache.wayang.core.plan.wayangplan.Operator

addBroadcastInput, addTargetPlatform, broadcastTo, broadcastTo, collectMappedInputSlots, collectMappedOutputSlots, connectTo, connectTo, getAllInputs, getAllOutputs, getCardinalityPusher, getContainer, getEffectiveOccupant, getEffectiveOccupant, getEpoch, getEstimationContextProperties, getForwards, getInnermostLoop, getInput, getInput, getLoopStack, getName, getNumBroadcastInputs, getNumInputs, getNumOutputs, getNumRegularInputs, getOuterInputSlot, getOutermostInputSlot, getOutermostOutputSlots, getOutput, getOutput, getParent, getTargetPlatforms, isAlternative, isConversion, isElementary, isExecutionOperator, isFeedbackInput, isFeedforwardOutput, isLoopHead, isLoopSubplan, isOwnerOf, isReading, isSink, isSource, isSubplan, isSupportingBroadcastInputs, isUnconnected, propagateInputCardinality, propagateOutputCardinality, propagateOutputCardinality, replaceWith, setContainer, setEpoch, setInput, setName, setOutput

Constructor Details

SqlToStreamOperator

public SqlToStreamOperator(JdbcPlatformTemplate jdbcPlatform)

Creates a new instance.

Parameters:

jdbcPlatform - from which the SQL data comes

SqlToStreamOperator

public SqlToStreamOperator(JdbcPlatformTemplate jdbcPlatform,
 DataSetType<Record> dataSetType)

Creates a new instance.

Parameters:

jdbcPlatform - from which the SQL data comes

dataSetType - type of the Records being transformed; see RecordType

SqlToStreamOperator

protected SqlToStreamOperator(SqlToStreamOperator that)

Method Details

evaluate

public Tuple<Collection<ExecutionLineageNode>,Collection<ChannelInstance>> evaluate(ChannelInstance[] inputs,
 ChannelInstance[] outputs,
 JavaExecutor executor,
 OptimizationContext.OperatorContext operatorContext)

Description copied from interface: JavaExecutionOperator

Evaluates this operator. Takes a set of Java Streams according to the operator inputs and produces a set of Streams according to the operator outputs -- unless the operator is a sink, then it triggers execution.

In addition, this method should give feedback of what this instance was doing by wiring the LazyExecutionLineageNodes of input and ouput ChannelInstances and providing a Collection of executed OptimizationContext.OperatorContexts.

Specified by:

evaluate in interface JavaExecutionOperator

Parameters:

inputs - ChannelInstances that satisfy the inputs of this operator

outputs - ChannelInstances that collect the outputs of this operator

executor - that executes this instance

operatorContext - optimization information for this instance

Returns:

Collections of what has been executed and produced

getSupportedInputChannels

public List<ChannelDescriptor> getSupportedInputChannels(int index)

Description copied from interface: ExecutionOperator

Display the supported Channels for a certain InputSlot.

Specified by:

getSupportedInputChannels in interface ExecutionOperator

Parameters:

index - the index of the InputSlot

Returns:

an List of Channels' Classes, ordered by their preference of use

getSupportedOutputChannels

public List<ChannelDescriptor> getSupportedOutputChannels(int index)

Description copied from interface: ExecutionOperator

Display the supported Channels for a certain OutputSlot.

Specified by:

getSupportedOutputChannels in interface ExecutionOperator

Parameters:

index - the index of the OutputSlot

Returns:

an List of Channels' Classes, ordered by their preference of use

See Also:

• ExecutionOperator.getOutputChannelDescriptor(int)

getLoadProfileEstimatorConfigurationKeys

public Collection<String> getLoadProfileEstimatorConfigurationKeys()

Description copied from interface: ExecutionOperator

Provide the Configuration keys for the LoadProfileEstimator specification of this instance.

Specified by:

getLoadProfileEstimatorConfigurationKeys in interface ExecutionOperator

Returns:

the Configuration keys

toJson

public WayangJsonObj toJson()

Description copied from interface: JsonSerializable

Convert this instance to a WayangJsonObj.

Specified by:

toJson in interface JsonSerializable

Returns:

the WayangJsonObj

fromJson

public static SqlToStreamOperator fromJson(WayangJsonObj wayangJsonObj)