com.redhat.lightblue.assoc.ep

Class ExecutionBlock

java.lang.Object

com.redhat.lightblue.assoc.ep.ExecutionBlock

public class ExecutionBlock
extends Object

A execution block contains the state information required to evaluate a query plan node. Each block is associated with several execution steps that define a pipeline of operations that will be performed on documents.

Field Summary

Fields

Modifier and Type	Field and Description
protected Step<ResultDocument>	resultStep Result step of this block
protected List<Step<?>>	steps All steps of this block

Constructor Summary

Constructors

Constructor and Description
ExecutionBlock(CompositeMetadata root, QueryPlanNode qpNode)

Method Summary

Modifier and Type	Method and Description
void	addChildSlot(ResolvedReferenceField reference)
void	addSourceBlock(ExecutionBlock source) Adds a source block
boolean	childSlotsHaveArrays() This returns true if at least one of the child slots contains an array reference
com.fasterxml.jackson.databind.JsonNode	explain(ExecutionContext ctx)
AssociationQuery	getAssociationQueryForEdge(ExecutionBlock sourceBlock) Returns the association query for the edge coming from the source block into this block
List<ChildSlot>	getChildSlots() Returns the slots for the child documents of the documents of this block
Path[]	getIdentityFields() Returns the identity fields for the entity
DocIdExtractor	getIdExtractor() Returns an ID extractor for the documents produced by this execution block
CompositeMetadata	getMetadata() Returns the metadata for the entity associated with this block
QueryPlanNode	getQueryPlanNode() Returns the query plan node for this block
ResolvedReferenceField	getReference() Returns the resolved reference pointing to the entity of this block
Step<ResultDocument>	getResultStep() Returns the result step of this block
List<ExecutionBlock>	getSourceBlocks() Returns the source execution blocks
<X> X	getStep(Class<X> clazz) Returns a step of the given type
void	initializeSteps()
void	linkBlocks() This should be called after all execution blocks are built
void	registerStep(Step<?> step)
void	setAssociationQuery(ExecutionBlock sourceBlock, AssociationQuery q) Sets an edge query
void	setResultStep(Source<ResultDocument> resultStep)
void	setResultStep(Step<ResultDocument> resultStep) Sets the result step of this block
com.fasterxml.jackson.databind.JsonNode	toJson()
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

resultStep

protected Step<ResultDocument> resultStep

Result step of this block

steps

protected final List<Step<?>> steps

All steps of this block

Constructor Detail

ExecutionBlock

public ExecutionBlock(CompositeMetadata root,
                      QueryPlanNode qpNode)

Method Detail

linkBlocks

public void linkBlocks()

This should be called after all execution blocks are built

initializeSteps

public void initializeSteps()

getChildSlots

public List<ChildSlot> getChildSlots()

Returns the slots for the child documents of the documents of this block

childSlotsHaveArrays

public boolean childSlotsHaveArrays()

This returns true if at least one of the child slots contains an array reference

addChildSlot

public void addChildSlot(ResolvedReferenceField reference)

addSourceBlock

public void addSourceBlock(ExecutionBlock source)

Adds a source block

getQueryPlanNode

public QueryPlanNode getQueryPlanNode()

Returns the query plan node for this block

getReference

public ResolvedReferenceField getReference()

Returns the resolved reference pointing to the entity of this block

getMetadata

public CompositeMetadata getMetadata()

Returns the metadata for the entity associated with this block

getIdentityFields

public Path[] getIdentityFields()

Returns the identity fields for the entity

getSourceBlocks

public List<ExecutionBlock> getSourceBlocks()

Returns the source execution blocks

getIdExtractor

public DocIdExtractor getIdExtractor()

Returns an ID extractor for the documents produced by this execution block

getStep

public <X> X getStep(Class<X> clazz)

Returns a step of the given type

registerStep

public void registerStep(Step<?> step)

getResultStep

public Step<ResultDocument> getResultStep()

Returns the result step of this block

setResultStep

public void setResultStep(Step<ResultDocument> resultStep)

Sets the result step of this block

setResultStep

public void setResultStep(Source<ResultDocument> resultStep)

getAssociationQueryForEdge

public AssociationQuery getAssociationQueryForEdge(ExecutionBlock sourceBlock)

Returns the association query for the edge coming from the source block into this block

setAssociationQuery

public void setAssociationQuery(ExecutionBlock sourceBlock,
                                AssociationQuery q)

Sets an edge query

toString

public String toString()

Overrides:

toString in class Object

toJson

public com.fasterxml.jackson.databind.JsonNode toJson()

explain

public com.fasterxml.jackson.databind.JsonNode explain(ExecutionContext ctx)