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The Drools and jBPM internal API which is NOT backwards compatible between releases.
There is a newer version: 9.44.0.Final
/*
 * Copyright 2017 Red Hat, Inc. and/or its affiliates.
 *
 * 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.kie.internal.services;

import java.util.List;

import org.kie.api.internal.assembler.KieAssemblerService;
import org.kie.api.internal.assembler.KieAssemblers;
import org.kie.api.io.Resource;
import org.kie.api.io.ResourceConfiguration;
import org.kie.api.io.ResourceType;
import org.kie.api.io.ResourceWithConfiguration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class KieAssemblersImpl extends AbstractMultiService implements KieAssemblers {

    private static final Logger logger = LoggerFactory.getLogger(KieAssemblersImpl.class);

    @Override
    public void addResourceBeforeRules(Object knowledgeBuilder, Resource resource, ResourceType type, ResourceConfiguration configuration) throws Exception {
        if (ResourceType.PMML.equals(type)) {
            // Temporary until Assemblers not fully removed
            logger.info("Ignoring resource {} of type {}", resource, type );
            return;
        }
        KieAssemblerService assembler = getAssembler(type);
        if (assembler != null) {
            assembler.addResourceBeforeRules(knowledgeBuilder,
                                             resource,
                                             type,
                                             configuration);
        } else {
            throw new RuntimeException("Unknown resource type: " + type);
        }
    }

    private KieAssemblerService getAssembler(ResourceType type) {
        return getService(type);
    }

    @Override
    public void addResourceAfterRules(Object knowledgeBuilder, Resource resource, ResourceType type, ResourceConfiguration configuration) throws Exception {
        if (ResourceType.PMML.equals(type)) {
            // Temporary until Assemblers not fully removed
            logger.info("Ignoring resource {} of type {}", resource, type );
            return;
        }
        KieAssemblerService assembler = getAssembler(type);
        if (assembler != null) {
            assembler.addResourceAfterRules(knowledgeBuilder,
                                            resource,
                                            type,
                                            configuration);
        } else {
            throw new RuntimeException("Unknown resource type: " + type);
        }

    }

    @Override
    public void addResourcesAfterRules(Object knowledgeBuilder, List resources, ResourceType type) throws Exception {
        if (ResourceType.PMML.equals(type)) {
            // Temporary until Assemblers not fully removed
            logger.info("Ignoring resources {} of type {}", resources, type );
            return;
        }
        KieAssemblerService assembler = getAssembler(type);
        if (assembler != null) {
            assembler.addResourcesAfterRules(knowledgeBuilder, resources, type);
        } else {
            throw new RuntimeException("Unknown resource type: " + type);
        }
    }

    @Override
    protected Class serviceClass() {
        return KieAssemblerService.class;
    }

    @Override
    protected ResourceType serviceKey(KieAssemblerService service) {
        return service.getResourceType();
    }
}