org.drools.reteoo
Class ObjectTypeNode

java.lang.Object
  org.drools.common.BaseNode
      org.drools.reteoo.ObjectSource
          org.drools.reteoo.ObjectTypeNode

All Implemented Interfaces:

Externalizable, Serializable, NetworkNode, NodeMemory, ObjectSink, Sink

public class ObjectTypeNode
extends ObjectSource
implements ObjectSink, Externalizable, NodeMemory

ObjectTypeNodes are responsible for filtering and propagating the matching fact assertions propagated from the Rete node using ObjectType interface.

The assert and retract methods do not attempt to filter as this is the role of the Rete node which builds up a cache of matching ObjectTypdeNodess for each asserted object, using the matches(Object object) method. Incorrect propagation in these methods is not checked and will result in ClassCastExpcections later on in the network.

Filters Objects coming from the Rete using a ObjectType semantic module.

See Also:

Rete, Serialized Form

Nested Class Summary

static class	ObjectTypeNode.ExpireJob
static class	ObjectTypeNode.ExpireJobContext
static class	ObjectTypeNode.ExpireJobContextTimerInputMarshaller
static class	ObjectTypeNode.ExpireJobContextTimerOutputMarshaller
static class	ObjectTypeNode.ObjectTypeNodeMemory

Field Summary

static ObjectTypeNode.ExpireJob

job

Fields inherited from class org.drools.reteoo.ObjectSource

declaredMask, inferredMask, sink, source

Fields inherited from class org.drools.common.BaseNode

associations, id, partitionId, partitionsEnabled

Constructor Summary

ObjectTypeNode()

ObjectTypeNode(int id, EntryPointNode source, ObjectType objectType, BuildContext context)
Construct given a semantic ObjectType and the provided unique id.

Method Summary

void	assertObject(InternalFactHandle factHandle, PropagationContext context, InternalWorkingMemory workingMemory) Propagate the FactHandleimpl through the Rete network.
void	attach(BuildContext context) Rete needs to know that this ObjectTypeNode has been added
void	byPassModifyToBetaNode(InternalFactHandle factHandle, ModifyPreviousTuples modifyPreviousTuples, PropagationContext context, InternalWorkingMemory workingMemory)
long	calculateDeclaredMask(List<String> settableProperties)
Memory	createMemory(RuleBaseConfiguration config) Creates memory for the node using PrimitiveLongMap as its optimised for storage and reteivals of Longs.
protected void	doRemove(RuleRemovalContext context, ReteooBuilder builder, BaseNode node, InternalWorkingMemory[] workingMemories) OTN needs to override remove to avoid releasing the node ID, since OTN are never removed from the rulebase in the current implementation
boolean	equals(Object object)
EntryPoint	getEntryPoint()
long	getExpirationOffset()
ObjectType	getObjectType() Retrieve the semantic ObjectType differentiator.
int	getOtnIdCounter()
int	hashCode() Uses he hashCode() of the underlying ObjectType implementation.
boolean	isAssignableFrom(ObjectType objectType)
boolean	isObjectMemoryEnabled()
void	modifyObject(InternalFactHandle factHandle, ModifyPreviousTuples modifyPreviousTuples, PropagationContext context, InternalWorkingMemory workingMemory)
void	networkUpdated(UpdateContext updateContext) A method that is called for all nodes whose network below them changed, after the change is complete, providing them with an oportunity for state update
int	nextOtnId()
void	readExternal(ObjectInput in)
void	remove(RuleRemovalContext context, ReteooBuilder builder, BaseNode node, InternalWorkingMemory[] workingMemories) OTN needs to override remove to avoid releasing the node ID, since OTN are never removed from the rulebase in the current implementation
void	retractObject(InternalFactHandle factHandle, PropagationContext context, InternalWorkingMemory workingMemory) Retract the FactHandleimpl from the Rete network.
void	setCompiledNetwork(CompiledNetwork compiledNetwork)
void	setExpirationOffset(long expirationOffset)
void	setObjectMemoryEnabled(boolean objectMemoryEnabled)
String	toString()
void	updateSink(ObjectSink sink, PropagationContext context, InternalWorkingMemory workingMemory)
void	writeExternal(ObjectOutput out)

Methods inherited from class org.drools.reteoo.ObjectSource

addObjectSink, getDeclaredMask, getObjectTypeNode, getParentObjectSource, getSinkPropagator, initDeclaredMask, isInUse, removeObjectSink, resetInferredMask, updateMask

Methods inherited from class org.drools.common.BaseNode

addAssociation, attach, getAssociations, getId, getPartitionId, removeAssociation, setPartitionId

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.drools.common.NetworkNode

getId, getPartitionId

Methods inherited from interface org.drools.common.NodeMemory

getId

Field Detail

job

public static final transient ObjectTypeNode.ExpireJob job

Constructor Detail

ObjectTypeNode

public ObjectTypeNode()

ObjectTypeNode

public ObjectTypeNode(int id,
                      EntryPointNode source,
                      ObjectType objectType,
                      BuildContext context)

Construct given a semantic ObjectType and the provided unique id. All ObjectTypdeNode have node memory.

Parameters:

id - The unique id for the node.

objectType - The semantic object-type differentiator.

Method Detail

getOtnIdCounter

public int getOtnIdCounter()

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
                         ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Overrides:

readExternal in class ObjectSource

Throws:

IOException

ClassNotFoundException

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Overrides:

writeExternal in class ObjectSource

Throws:

IOException

getObjectType

public ObjectType getObjectType()

Retrieve the semantic ObjectType differentiator.

Returns:

The semantic ObjectType differentiator.

calculateDeclaredMask

public long calculateDeclaredMask(List<String> settableProperties)

Specified by:

calculateDeclaredMask in class ObjectSource

isAssignableFrom

public boolean isAssignableFrom(ObjectType objectType)

setCompiledNetwork

public void setCompiledNetwork(CompiledNetwork compiledNetwork)

assertObject

public void assertObject(InternalFactHandle factHandle,
                         PropagationContext context,
                         InternalWorkingMemory workingMemory)

Propagate the FactHandleimpl through the Rete network. All FactHandleImpl should be remembered in the node memory, so that later runtime rule attachmnents can have the matched facts propagated to them.

Specified by:

assertObject in interface ObjectSink

Parameters:

factHandle - The fact handle.

object - The object to assert.

workingMemory - The working memory session.

retractObject

public void retractObject(InternalFactHandle factHandle,
                          PropagationContext context,
                          InternalWorkingMemory workingMemory)

Retract the FactHandleimpl from the Rete network. Also remove the FactHandleImpl from the node memory.

Parameters:

rightTuple - The fact handle.

object - The object to assert.

workingMemory - The working memory session.

modifyObject

public void modifyObject(InternalFactHandle factHandle,
                         ModifyPreviousTuples modifyPreviousTuples,
                         PropagationContext context,
                         InternalWorkingMemory workingMemory)

Specified by:

modifyObject in interface ObjectSink

updateSink

public void updateSink(ObjectSink sink,
                       PropagationContext context,
                       InternalWorkingMemory workingMemory)

Specified by:

updateSink in class ObjectSource

attach

public void attach(BuildContext context)

Rete needs to know that this ObjectTypeNode has been added

Specified by:

attach in class BaseNode

networkUpdated

public void networkUpdated(UpdateContext updateContext)

Description copied from class: BaseNode

A method that is called for all nodes whose network below them changed, after the change is complete, providing them with an oportunity for state update

Overrides:

networkUpdated in class ObjectSource

nextOtnId

public int nextOtnId()

remove

public void remove(RuleRemovalContext context,
                   ReteooBuilder builder,
                   BaseNode node,
                   InternalWorkingMemory[] workingMemories)

OTN needs to override remove to avoid releasing the node ID, since OTN are never removed from the rulebase in the current implementation

Overrides:

remove in class BaseNode

See Also:

BaseNode.remove(org.drools.reteoo.RuleRemovalContext, org.drools.reteoo.ReteooBuilder, org.drools.common.BaseNode, org.drools.common.InternalWorkingMemory[])

doRemove

protected void doRemove(RuleRemovalContext context,
                        ReteooBuilder builder,
                        BaseNode node,
                        InternalWorkingMemory[] workingMemories)

OTN needs to override remove to avoid releasing the node ID, since OTN are never removed from the rulebase in the current implementation

Overrides:

doRemove in class ObjectSource

createMemory

public Memory createMemory(RuleBaseConfiguration config)

Creates memory for the node using PrimitiveLongMap as its optimised for storage and reteivals of Longs. However PrimitiveLongMap is not ideal for spase data. So it should be monitored incase its more optimal to switch back to a standard HashMap.

Specified by:

createMemory in interface NodeMemory

isObjectMemoryEnabled

public boolean isObjectMemoryEnabled()

setObjectMemoryEnabled

public void setObjectMemoryEnabled(boolean objectMemoryEnabled)

toString

public String toString()

Overrides:

toString in class BaseNode

hashCode

public int hashCode()

Uses he hashCode() of the underlying ObjectType implementation.

Overrides:

hashCode in class BaseNode

equals

public boolean equals(Object object)

Overrides:

equals in class Object

getEntryPoint

public EntryPoint getEntryPoint()

Returns:

the entryPoint

getExpirationOffset

public long getExpirationOffset()

setExpirationOffset

public void setExpirationOffset(long expirationOffset)

byPassModifyToBetaNode

public void byPassModifyToBetaNode(InternalFactHandle factHandle,
                                   ModifyPreviousTuples modifyPreviousTuples,
                                   PropagationContext context,
                                   InternalWorkingMemory workingMemory)

Specified by:

byPassModifyToBetaNode in interface ObjectSink