content: package act.db.di;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2014 - 2017 ActFramework
   * %%
   * 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.
   * #L%
   */
  
  import act.app.DbServiceManager;
  import act.db.DB;
  import act.inject.DependencyInjectionListener;
  import act.util.*;
  import org.osgl.$;
  import org.osgl.logging.LogManager;
  import org.osgl.logging.Logger;
  
  import java.lang.reflect.Type;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  public abstract class DaoInjectionListenerBase extends LogSupportedDestroyableBase implements DependencyInjectionListener {
  
      protected Logger logger = LogManager.get(DaoInjectionListenerBase.class);
  
      // Map type parameter array to (Model type, service ID) pair
      private Map<List<Type>, $.T2<Class, String>> svcIdCache = new HashMap<>();
  
      @Override
      protected void releaseResources() {
          svcIdCache.clear();
      }
  
      protected $.T2<Class, String> resolve(List<Type> typeParameters) {
          $.T2<Class, String> resolved = svcIdCache.get(typeParameters);
          if (null == resolved) {
              resolved = findSvcId(typeParameters);
              svcIdCache.put(typeParameters, resolved);
          }
          return resolved;
      }
  
      private $.T2<Class, String> findSvcId(List<Type> typeParameters) {
          // the EbeanDao<Long, User> and MorphiaDao<User> case
          Type modelType = (typeParameters.size() > 1) ? typeParameters.get(1) : typeParameters.get(0);
          DB db = AnnotationUtil.declaredAnnotation((Class)modelType, DB.class);
          return $.T2((Class) modelType, null == db ? DbServiceManager.DEFAULT : db.value());
      }
  
  }
  