org.drools.core.rule
Class SlidingLengthWindow

java.lang.Object
  org.drools.core.rule.SlidingLengthWindow

All Implemented Interfaces:

Externalizable, Serializable, Cloneable, Behavior, RuleComponent

public class SlidingLengthWindow
extends Object
implements Externalizable, Behavior

A length window behavior implementation

See Also:

Serialized Form

Nested Class Summary

static class

SlidingLengthWindow.SlidingLengthWindowContext A Context object for length windows

Nested classes/interfaces inherited from interface org.drools.core.rule.Behavior

Behavior.BehaviorType

Field Summary

Fields inherited from interface org.drools.core.rule.Behavior

EMPTY_BEHAVIOR_LIST

Constructor Summary

SlidingLengthWindow()

SlidingLengthWindow(int size)

Method Summary

boolean	assertFact(WindowNode.WindowMemory memory, Object context, InternalFactHandle handle, PropagationContext pctx, InternalWorkingMemory workingMemory) Makes the behavior aware of the new fact entering behavior's scope
Object	createContext() Creates the context object associated with this behavior.
void	expireFacts(WindowNode.WindowMemory memory, Object context, PropagationContext pctx, InternalWorkingMemory workingMemory) A callback method that allows behaviors to expire facts
long	getExpirationOffset() Length windows don't change expiration offset, so always return -1
long	getSize()
Behavior.BehaviorType	getType() Returns the type of the behavior
void	readExternal(ObjectInput in)
void	retractFact(WindowNode.WindowMemory memory, Object context, InternalFactHandle handle, PropagationContext pctx, InternalWorkingMemory workingMemory) Removes a right tuple from the behavior's scope
void	setSize(int size)
String	toString()
void	writeExternal(ObjectOutput out)

Methods inherited from class java.lang.Object

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

Constructor Detail

SlidingLengthWindow

public SlidingLengthWindow()

SlidingLengthWindow

public SlidingLengthWindow(int size)

Parameters:

size -

Method Detail

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
                         ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Throws:

IOException

ClassNotFoundException

See Also:

Externalizable.readExternal(java.io.ObjectInput)

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Throws:

IOException

See Also:

Externalizable.writeExternal(java.io.ObjectOutput)

getType

public Behavior.BehaviorType getType()

Description copied from interface: Behavior

Returns the type of the behavior

Specified by:

getType in interface Behavior

Returns:

getSize

public long getSize()

Returns:

the size

setSize

public void setSize(int size)

Parameters:

size - the size to set

createContext

public Object createContext()

Description copied from interface: Behavior

Creates the context object associated with this behavior. The object is given as a parameter in all behavior call backs.

Specified by:

createContext in interface Behavior

Returns:

assertFact

public boolean assertFact(WindowNode.WindowMemory memory,
                          Object context,
                          InternalFactHandle handle,
                          PropagationContext pctx,
                          InternalWorkingMemory workingMemory)

Description copied from interface: Behavior

Makes the behavior aware of the new fact entering behavior's scope

Specified by:

assertFact in interface Behavior

Parameters:

memory - The window node memory

context - The behavior context object

handle - The new fact entering behavior's scope

workingMemory - The working memory session reference

Returns:

true if the propagation should continue, false otherwise. I.e., the behaviour has veto power over the fact propagation, and prevents the propagation to continue if returns false on this method.

retractFact

public void retractFact(WindowNode.WindowMemory memory,
                        Object context,
                        InternalFactHandle handle,
                        PropagationContext pctx,
                        InternalWorkingMemory workingMemory)

Description copied from interface: Behavior

Removes a right tuple from the behavior's scope

Specified by:

retractFact in interface Behavior

Parameters:

memory - The window node memory

context - The behavior context object

handle - The fact leaving the behavior's scope

workingMemory - The working memory session reference

expireFacts

public void expireFacts(WindowNode.WindowMemory memory,
                        Object context,
                        PropagationContext pctx,
                        InternalWorkingMemory workingMemory)

Description copied from interface: Behavior

A callback method that allows behaviors to expire facts

Specified by:

expireFacts in interface Behavior

Parameters:

memory - The window node memory

context - The behavior context object

workingMemory - The working memory session reference

getExpirationOffset

public long getExpirationOffset()

Length windows don't change expiration offset, so always return -1

Specified by:

getExpirationOffset in interface Behavior

Returns:

the expiration offset for this behavior or -1 if they don't have a time based expiration offset.

toString

public String toString()

Overrides:

toString in class Object