package org.drools.jsr94.rules;
/*
* $Id: ExampleRuleEngineFacade.java,v 1.5 2004/11/17 03:09:50 dbarnett Exp $
*
* Copyright 2002-2004 (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 registered trademark of The Werken Company.
*
* 5. Due credit should be given to The Werken Company.
* (http://drools.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.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import javax.rules.RuleRuntime;
import javax.rules.RuleServiceProvider;
import javax.rules.RuleServiceProviderManager;
import javax.rules.StatefulRuleSession;
import javax.rules.StatelessRuleSession;
import javax.rules.admin.LocalRuleExecutionSetProvider;
import javax.rules.admin.RuleAdministrator;
import javax.rules.admin.RuleExecutionSet;
/**
* Builds up the JSR94 object structure. It'll simplify the task of building a
* <code>RuleExecutionSet</code> and associated <code>RuntimeSession</code>
* objects from a given <code>InputStream</code>.
*
* @author N. Alex Rupp (n_alex <at>codehaus.org)
*/
public class ExampleRuleEngineFacade
{
public static final String RULE_SERVICE_PROVIDER = "http://drools.org/";
private RuleAdministrator ruleAdministrator;
private RuleServiceProvider ruleServiceProvider;
private LocalRuleExecutionSetProvider ruleSetProvider;
private RuleRuntime ruleRuntime;
// configuration parameters
String ruleFilesDirectory;
String ruleFilesIncludes;
public ExampleRuleEngineFacade( ) throws Exception
{
RuleServiceProviderManager.registerRuleServiceProvider(
RULE_SERVICE_PROVIDER, RuleServiceProviderImpl.class );
ruleServiceProvider = RuleServiceProviderManager.getRuleServiceProvider(
RULE_SERVICE_PROVIDER );
ruleAdministrator = ruleServiceProvider.getRuleAdministrator( );
ruleSetProvider =
ruleAdministrator.getLocalRuleExecutionSetProvider( null );
}
public void addRuleExecutionSet(
String bindUri, InputStream resourceAsStream ) throws Exception
{
Reader ruleReader = new InputStreamReader( resourceAsStream );
RuleExecutionSet ruleExecutionSet =
ruleSetProvider.createRuleExecutionSet( ruleReader, null );
ruleAdministrator.registerRuleExecutionSet(
bindUri, ruleExecutionSet, null );
}
/**
* Returns a named <code>StatelessRuleSession</code>.
*
* @param key
* @return StatelessRuleSession
* @throws Exception
*/
public StatelessRuleSession getStatelessRuleSession( String key)
throws Exception
{
ruleRuntime = ruleServiceProvider.getRuleRuntime( );
return ( StatelessRuleSession ) ruleRuntime.createRuleSession(
key, null, RuleRuntime.STATELESS_SESSION_TYPE );
}
public StatefulRuleSession getStatefulRuleSession( String key )
throws Exception
{
ruleRuntime = ruleServiceProvider.getRuleRuntime( );
return ( StatefulRuleSession ) ruleRuntime.createRuleSession(
key, null, RuleRuntime.STATEFUL_SESSION_TYPE );
}
public RuleServiceProvider getRuleServiceProvider( )
{
return this.ruleServiceProvider;
}
}