package org.drools.jsr94.rules;
/*
* Copyright 2005 JBoss Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import javax.rules.ConfigurationException;
import javax.rules.RuleRuntime;
import javax.rules.RuleServiceProvider;
import javax.rules.RuleServiceProviderManager;
import javax.rules.admin.RuleAdministrator;
import org.drools.jsr94.rules.admin.RuleAdministratorImpl;
import org.drools.jsr94.rules.admin.RuleExecutionSetRepository;
/**
* This class provides access to the <code>RuleRuntime</code> and
* <code>RuleAdministrator</code> implementation supplied by Drools when
* running under J2SE. <p/> This class should be used in environments without a
* JNDI provider - typically when writing standalone J2SE clients. Within the
* J2EE environment the <code>RuleServiceProvider</code> implementation class
* provided by Drools should be retrieved using a JNDI lookup. <p/> This class
* should be constructed using the
* <code>RuleServiceProviderManager.getRuleServiceProvider</code> method.
* This class is automatically registered to "http://drools.org/" on startup,
* via the static block.
*
* @see RuleRuntimeImpl
* @see RuleAdministratorImpl
* @see RuleServiceProvider
* @see javax.rules.RuleServiceProviderManager#getRuleServiceProvider(String)
*
* @author <a href="mailto:thomas.diesler@softcon-itec.de">thomas diesler </a>
*/
public class RuleServiceProviderImpl extends RuleServiceProvider implements java.io.Serializable {
public static final String RULE_SERVICE_PROVIDER = "http://drools.org/";
/** An instance of <code>RuleRuntimeImpl</code>. */
private RuleRuntime ruleRuntime;
/** An instance of <code>RuleAdministratorImpl</code>. */
private RuleAdministrator ruleAdministrator;
private RuleExecutionSetRepository repository;
static {
try {
RuleServiceProviderManager.registerRuleServiceProvider( RULE_SERVICE_PROVIDER,
RuleServiceProviderImpl.class );
} catch ( ConfigurationException e ) {
System.err.println( "Unable to regiser Rule Service Provider " + RULE_SERVICE_PROVIDER );
}
}
/**
* Create a new <code>RuleServiceProviderImpl</code>.
*/
public RuleServiceProviderImpl() {
// no special initialization required
}
/**
* Returns the RuleExecutionSetRepository
* @return
*/
public synchronized RuleExecutionSetRepository getRepository() {
// Lazy loaded
if ( this.repository == null ) {
this.repository = new RuleExecutionSetRepository();
}
return this.repository;
}
/**
* Returns a class instance of <code>RuleRuntime</code>. Specifically an
* instance of the Drools <code>RuleRuntimeImpl</code> is returned.
*
* @return an instance of <code>RuleRuntime</code>
*/
public synchronized RuleRuntime getRuleRuntime() {
if ( this.ruleRuntime == null ) {
this.ruleRuntime = new RuleRuntimeImpl( getRepository() );
}
return this.ruleRuntime;
}
/**
* Returns a class instance of <code>RuleAdministrator</code>.
* Specifically an instance of the Drools <code>RuleAdministratorImpl</code>
* is returned.
*
* @return an instance of <code>RuleAdministrator</code>
*/
public synchronized RuleAdministrator getRuleAdministrator() {
// Lazy instantiate
if ( this.ruleAdministrator == null ) {
this.ruleAdministrator = new RuleAdministratorImpl( getRepository() );
}
return this.ruleAdministrator;
}
}