com.pervasive.datarush.ports.model

Class DoneSignalPort

java.lang.Object

com.pervasive.datarush.ports.LogicalPort

com.pervasive.datarush.ports.model.AbstractModelPort<Void>

com.pervasive.datarush.ports.model.DoneSignalPort

public final class DoneSignalPort
extends AbstractModelPort<Void>

Used to coordinate processing between operators that have a processing dependency but no explicit data dependency. An example would be one operator that writes data to a temporary file and another operator that reads from that file. Note that this is a rarely-used feature.

Nested Class Summary

Nested classes/interfaces inherited from class com.pervasive.datarush.ports.LogicalPort

LogicalPort.Direction

Field Summary

Fields

Modifier and Type	Field and Description
static AbstractModelPortFactory<Void,DoneSignalPort>	FACTORY The factory for DoneSignalPorts

Method Summary

Modifier and Type	Method and Description
LogicalPortFactory<? extends AbstractModelPort<?>>	getFactory() Returns the factory that knows how to create ports of this type
AbstractModelPortMetadata	getMetadata(Void model) Returns the metadata associate with the model.
Class<? extends PortMetadata>	getMetadataType() Returns the class of metadata that this port uses
static DoneSignalPort	getOutput(LogicalOperator op) Returns the done signal port from the given operator if it defines one, throwing an exception if none found
void	signalDone(ExecutionContext ctx) Signals downstream operators that we are done
void	waitDone(ExecutionContext ctx) Waits until upstream operator has sent the done signal

Methods inherited from class com.pervasive.datarush.ports.model.AbstractModelPort

getModel, getModelClass, getStorageHandler, setMergeHandler, setModel

Methods inherited from class com.pervasive.datarush.ports.LogicalPort

getDirection, getName, getOwner, isOptional, toString

Methods inherited from class java.lang.Object

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

Field Detail

FACTORY

public static final AbstractModelPortFactory<Void,DoneSignalPort> FACTORY

The factory for DoneSignalPorts

Method Detail

getMetadata

public AbstractModelPortMetadata getMetadata(Void model)

Description copied from class: AbstractModelPort

Returns the metadata associate with the model. (Given a model, we should always be able to get its metadata.

Specified by:

getMetadata in class AbstractModelPort<Void>

Parameters:

model - the model object

Returns:

the metadata

getFactory

public LogicalPortFactory<? extends AbstractModelPort<?>> getFactory()

Description copied from class: LogicalPort

Returns the factory that knows how to create ports of this type

Specified by:

getFactory in class AbstractModelPort<Void>

Returns:

the factory that knows how to create ports of this type

getMetadataType

public Class<? extends PortMetadata> getMetadataType()

Description copied from class: LogicalPort

Returns the class of metadata that this port uses

Specified by:

getMetadataType in class LogicalPort

Returns:

the class of metadata that this port uses

signalDone

public void signalDone(ExecutionContext ctx)

Signals downstream operators that we are done

Parameters:

ctx - the execution context

waitDone

public void waitDone(ExecutionContext ctx)

Waits until upstream operator has sent the done signal

Parameters:

ctx - the execution context

getOutput

public static DoneSignalPort getOutput(LogicalOperator op)

Returns the done signal port from the given operator if it defines one, throwing an exception if none found

Parameters:

op - the operator

Returns:

the done signal port