org.drools.runtime.rule
Interface WorkingMemoryEntryPoint

All Known Subinterfaces:

KnowledgeRuntime, StatefulKnowledgeSession, WorkingMemory

All Known Implementing Classes:

StatefulProcessSession

public interface WorkingMemoryEntryPoint

An entry-point is an abstract channel through where facts are inserted into the engine.

Drools 5 supports multiple entry-points into a single StatefulKnowledgeBase: the default, anonymous entry-point, as well as as many user declared entry points the application requires.

To get a reference to an entry point, just request the session:

 StatefulKnowledgeSession session = kbase.newStatelessKnowledgeSession();
 ...
 WorkingMemoryEntryPoint entrypoint = session.getWorkingMemoryEntryPoint("my entry point");
 

Once a reference to an entry point is acquired, the application can insert, update and retract facts to/from that entry-point as usual:

 ...
 FactHandle factHandle = entrypoint.insert( fact );
 ...
 entrypoint.update( factHandle, newFact );
 ...
 entrypoint.retract( factHandle );
 ...
 

Method Summary

String	getEntryPointId() Returns the String Id of this entry point
long	getFactCount() Returns the total number of facts currently in this entry point
FactHandle	getFactHandle(Object object) Returns the fact handle associated with the given object.
<T extends FactHandle> Collection<T>	getFactHandles() Returns all FactHandles from the current session.
<T extends FactHandle> Collection<T>	getFactHandles(ObjectFilter filter) Returns all FactHandles from the current session for which the facts are accepted by the given filter.
Object	getObject(FactHandle factHandle) Returns the object associated with the given FactHandle.
Collection<Object>	getObjects() Returns all facts from the current session as a Collection.
Collection<Object>	getObjects(ObjectFilter filter) Returns all facts from the current session that are accepted by the given ObjectFilter.
FactHandle	insert(Object object) Inserts a new fact into this entry point
void	retract(FactHandle handle) Retracts the fact for which the given FactHandle was assigned.
void	update(FactHandle handle, Object object) Updates the fact for which the given FactHandle was assigned with the new fact set as the second parameter in this method.

Method Detail

getEntryPointId

String getEntryPointId()

Returns the String Id of this entry point

Returns:

insert

FactHandle insert(Object object)

Inserts a new fact into this entry point

Parameters:

object - the fact to be inserted

Returns:

the fact handle created for the given fact

retract

void retract(FactHandle handle)

Retracts the fact for which the given FactHandle was assigned.

Parameters:

handle - the handle whose fact is to be retracted.

update

void update(FactHandle handle,
            Object object)

Updates the fact for which the given FactHandle was assigned with the new fact set as the second parameter in this method.

Parameters:

handle - the FactHandle for the fact to be updated.

object - the new value for the fact being updated.

getFactHandle

FactHandle getFactHandle(Object object)

Returns the fact handle associated with the given object. It is important to note that this method behaves in accordance with the configured assert behaviour for this knowledge base (either IDENTITY or EQUALITY).

Parameters:

object - the fact for which the fact handle will be returned.

Returns:

the fact handle for the given object, or null in case no fact handle was found for the given object.

See Also:

KnowledgeBaseConfiguration

getObject

Object getObject(FactHandle factHandle)

Returns the object associated with the given FactHandle.

Parameters:

factHandle -

Returns:

getObjects

Collection<Object> getObjects()

Returns all facts from the current session as a Collection.

This class is not a general-purpose Collection implementation! While this class implements the Collection interface, it intentionally violates Collection general contract, which mandates the use of the equals method when comparing objects.

Instead the approach used when comparing objects with the contains(Object) method is dependent on the WorkingMemory configuration, where it can be configured for Identity or for Equality.

Returns:

getObjects

Collection<Object> getObjects(ObjectFilter filter)

Returns all facts from the current session that are accepted by the given ObjectFilter.

Parameters:

filter - the filter to be applied to the returned collection of facts.

Returns:

getFactHandles

<T extends FactHandle> Collection<T> getFactHandles()

Returns all FactHandles from the current session.

Returns:

getFactHandles

<T extends FactHandle> Collection<T> getFactHandles(ObjectFilter filter)

Returns all FactHandles from the current session for which the facts are accepted by the given filter.

Parameters:

filter - the filter to be applied to the returned collection of FactHandles.

Returns:

getFactCount

long getFactCount()

Returns the total number of facts currently in this entry point

Returns: