package org.drools.reteoo;
/*
* $Id: RuleBaseImpl.java,v 1.30 2005/11/29 01:21:53 michaelneale Exp $
*
* Copyright 2001-2003 (C) The Werken Company. All Rights Reserved.
*
* Redistribution and use of this software and associated documentation
* ("Software"), with or without modification, are permitted provided that the
* following conditions are met:
*
* 1. Redistributions of source code must retain copyright statements and
* notices. Redistributions must also contain a copy of this document.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name "drools" must not be used to endorse or promote products derived
* from this Software without prior written permission of The Werken Company.
* For written permission, please contact bob@werken.com.
*
* 4. Products derived from this Software may not be called "drools" nor may
* "drools" appear in their names without prior written permission of The Werken
* Company. "drools" is a trademark of The Werken Company.
*
* 5. Due credit should be given to The Werken Company. (http://werken.com/)
*
* THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS ``AS IS''
* AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE WERKEN COMPANY OR ITS CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.drools.FactException;
import org.drools.FactHandle;
import org.drools.RuleBase;
import org.drools.WorkingMemory;
import org.drools.conflict.DefaultConflictResolver;
import org.drools.spi.ConflictResolver;
import org.drools.spi.RuleBaseContext;
/**
* Implementation of <code>RuleBase</code>.
*
* @author <a href="mailto:bob@werken.com">bob mcwhirter </a>
*
* @version $Id: RuleBaseImpl.java,v 1.30 2005/11/29 01:21:53 michaelneale Exp $
*/
class RuleBaseImpl
implements
RuleBase
{
// ------------------------------------------------------------
// Instance members
// ------------------------------------------------------------
/** The root Rete-OO for this <code>RuleBase</code>. */
private final Rete rete;
/** Conflict resolution strategy. */
private final ConflictResolver conflictResolver;
/** The fact handle factory. */
private final FactHandleFactory factHandleFactory;
private List ruleSets;
private Map applicationData;
private RuleBaseContext ruleBaseContext;
private static ThreadLocal currentWoringMemory = new ThreadLocal();
// ------------------------------------------------------------
// Constructors
// ------------------------------------------------------------
/**
* Construct.
*
* @param rete
* The rete network.
*/
RuleBaseImpl(Rete rete)
{
this( rete,
DefaultConflictResolver.getInstance( ),
new DefaultFactHandleFactory( ),
null,
new HashMap( ) ,
new RuleBaseContext( ) );
}
/**
* Construct.
*
* @param rete
* The rete network.
* @param conflictResolver
* The conflict resolver.
* @param factHandleFactory
* The fact handle factory.
* @param ruleSets
* @param applicationData
*/
RuleBaseImpl(Rete rete,
ConflictResolver conflictResolver,
FactHandleFactory factHandleFactory,
List ruleSets,
Map applicationData,
RuleBaseContext ruleBaseContext)
{
this.rete = rete;
this.factHandleFactory = factHandleFactory;
this.conflictResolver = conflictResolver;
this.ruleSets = ruleSets;
this.applicationData = applicationData;
this.ruleBaseContext = ruleBaseContext;
}
// ------------------------------------------------------------
// Instance methods
// ------------------------------------------------------------
/**
* @see RuleBase
*/
public WorkingMemory newWorkingMemory()
{
return new WorkingMemoryImpl( this );
}
/**
* This will create a new instance, as they should not be shared between working memories.
* This RuleBase takes in a factory simply to allow implementations to be swapped in and out.
* And it is really too embarrasing to have a "factory factory".
* TODO: refactor this differently so that factories are configured more implicitly.
* @see RuleBase
*/
public FactHandleFactory newFactHandleFactory()
{
return this.factHandleFactory.newInstance();
}
/**
* @see RuleBase
*/
public ConflictResolver getConflictResolver()
{
return this.conflictResolver;
}
/**
* Retrieve the Rete-OO network for this <code>RuleBase</code>.
*
* @return The RETE-OO network.
*/
Rete getRete()
{
return this.rete;
}
/**
* Assert a fact object.
*
* @param handle
* The handle.
* @param object
* The fact.
* @param workingMemory
* The working-memory.
*
* @throws FactException
* If an error occurs while performing the assertion.
*/
void assertObject(FactHandle handle,
Object object,
WorkingMemoryImpl workingMemory) throws FactException
{
getRete( ).assertObject( handle,
object,
workingMemory );
}
/**
* Retract a fact object.
*
* @param handle
* The handle.
* @param workingMemory
* The working-memory.
*
* @throws FactException
* If an error occurs while performing the retraction.
*/
void retractObject(FactHandle handle,
WorkingMemoryImpl workingMemory) throws FactException
{
getRete( ).retractObject( handle,
workingMemory );
}
public List getRuleSets()
{
return this.ruleSets;
}
public Map getApplicationData()
{
return this.applicationData;
}
public RuleBaseContext getRuleBaseContext()
{
return this.ruleBaseContext;
}
public WorkingMemory getCurrentThreadWorkingMemory() {
Object wm = currentWoringMemory.get();
if (wm == null) {
wm = this.newWorkingMemory();
currentWoringMemory.set(wm);
}
return (WorkingMemory) wm;
}
}