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The Drools and jBPM public API which is backwards compatible between releases.
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/*
 * Copyright 2010 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.
 */

package org.drools;

import java.util.Properties;

import org.drools.runtime.Environment;
import org.drools.runtime.KnowledgeSessionConfiguration;

/**
 * KnowledgeBaseFactoryService is the interface implemented by KnowledgeBaseFactory.
 * This class is not considered stable and may change.
 *
 * Users are referred to the KnowledgeBaseFactory API, which is considered stable.
 */
public interface KnowledgeBaseFactoryService extends Service {

    /**
     * Instantiate and return a new KnowledgeBaseConfiguration
     *
     * @return
     *     the KnowledgeBaseConfiguration
     */
    public KnowledgeBaseConfiguration newKnowledgeBaseConfiguration();

    /**
     * Instantiate and return a new KnowledgeBaseConfiguration
     *
     * @param properties
     *     Properties file to process, can be null;
     * @param classLoader
     *     Provided ClassLoader, can be null and then ClassLoader defaults to Thread.currentThread().getContextClassLoader()
     * @return
     *     The KnowledgeBaseConfiguration
     */
    public KnowledgeBaseConfiguration newKnowledgeBaseConfiguration(Properties properties,
                                                                    ClassLoader... classLoader);

    /**
     * Instantiate and return a new KnowledgeSessionConfiguration
     *
     * @return
     *     the KnowledgeSessionConfiguration
     */
    public KnowledgeSessionConfiguration newKnowledgeSessionConfiguration();

    /**
     * Instantiate and return a new KnowledgeSessionConfiguration
     *
     * @param properties
     *     Properties file to process, can be null;
     * @param classLoader
     *     Provided ClassLoader, can be null and then ClassLoader defaults to Thread.currentThread().getContextClassLoader()
     * @return
     *     The KnowledgeSessionConfiguration
     */
    public KnowledgeSessionConfiguration newKnowledgeSessionConfiguration(Properties properties);

    /**
     * Instantiate and return a KnowledgeBase using a default KnowledgeBaseConfiguration
     *
     * @return
     *      The KnowledgeBase
     */
    KnowledgeBase newKnowledgeBase();

    /**
     * Instantiate and return a KnowledgeBase using a default KnowledgeBaseConfiguration
     * and the given KnowledgeBase ID.
     *
     * @param kbaseId
     *     A string Identifier for the knowledge base. Specially useful when enabling
     *     JMX monitoring and management, as that ID will be used to compose the
     *     JMX ObjectName for all related MBeans. The application must ensure all kbase 
     *     IDs are unique. 
     * @return
     *      The KnowledgeBase
     */
    KnowledgeBase newKnowledgeBase( String kbaseId );

    /**
     * Instantiate and return a KnowledgeBase using the given KnowledgeBaseConfiguration
     *
     * @param conf
     *     The KnowledgeBaseConfiguration to be used
     * @return
     *     The KnowledgeBase
     */
    KnowledgeBase newKnowledgeBase(KnowledgeBaseConfiguration conf);

    /**
     * Instantiate and return a KnowledgeBase using the given KnowledgeBaseConfiguration and
     * the given KnowledgeBase ID.
     *
     * @param kbaseId
     *     A string Identifier for the knowledge base. Specially useful when enabling
     *     JMX monitoring and management, as that ID will be used to compose the
     *     JMX ObjectName for all related MBeans. The application must ensure all kbase 
     *     IDs are unique. 
     * @param conf
     *     The KnowledgeBaseConfiguration to be used
     * @return
     *     The KnowledgeBase
     */
    KnowledgeBase newKnowledgeBase(String kbaseId, KnowledgeBaseConfiguration conf);

    /**
     * Instantiate and return an Environment
     *
     * @return
     *      The Environment
     */
    Environment newEnvironment();

}