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The Drools and jBPM public API which is backwards compatible between releases.

There is a newer version: 6.5.0.Final

package org.drools.impl;

import org.drools.KnowledgeBase;
import org.drools.impl.adapters.EnvironmentAdapter;
import org.drools.impl.adapters.KnowledgeBaseAdapter;
import org.drools.impl.adapters.KnowledgeSessionConfigurationAdapter;
import org.drools.impl.adapters.StatefulKnowledgeSessionAdapter;
import org.drools.persistence.jpa.KnowledgeStoreService;
import org.drools.runtime.Environment;
import org.drools.runtime.KnowledgeSessionConfiguration;
import org.drools.runtime.StatefulKnowledgeSession;
import org.kie.api.KieBase;
import org.kie.internal.persistence.jpa.JPAKnowledgeService;

public class KnowledgeStoreServiceImpl implements KnowledgeStoreService {
	
	public StatefulKnowledgeSession newStatefulKnowledgeSession(
			KnowledgeBase kbase, KnowledgeSessionConfiguration configuration,
			Environment environment) {
		return new StatefulKnowledgeSessionAdapter(JPAKnowledgeService.newStatefulKnowledgeSession(
			(KieBase) ((KnowledgeBaseAdapter) kbase).delegate, 
			configuration == null ? null : ((KnowledgeSessionConfigurationAdapter) configuration).getDelegate(), 
			((EnvironmentAdapter) environment).delegate));
	}

	public StatefulKnowledgeSession loadStatefulKnowledgeSession(int id,
			KnowledgeBase kbase, KnowledgeSessionConfiguration configuration,
			Environment environment) {
		return new StatefulKnowledgeSessionAdapter(JPAKnowledgeService.loadStatefulKnowledgeSession(
			id,
			(KieBase) ((KnowledgeBaseAdapter) kbase).delegate, 
			configuration == null ? null : ((KnowledgeSessionConfigurationAdapter) configuration).getDelegate(), 
			((EnvironmentAdapter) environment).delegate));
	}

}