content: /*
   * Copyright (c) 2020 Adam Gaj
   *
   * 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
   *
   *     https://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 com.adgadev.jplusone.core.proxy.jpa;
  
  import com.adgadev.jplusone.core.proxy.Identifier;
  import com.adgadev.jplusone.core.proxy.StateListener;
  import lombok.RequiredArgsConstructor;
  import lombok.extern.slf4j.Slf4j;
  import org.aopalliance.intercept.MethodInterceptor;
  import org.aopalliance.intercept.MethodInvocation;
  import org.springframework.aop.framework.ProxyFactory;
  
  import jakarta.persistence.EntityManager;
  
  @Slf4j
  public class EntityManagerAopProxyFactory {
  
      public static EntityManager createProxy(EntityManager target, StateListener stateListener, Identifier identifier) {
          ProxyFactory proxyFactory = new ProxyFactory(target);
          proxyFactory.addAdvice(new EntityManagerMethodInterceptor(stateListener, identifier));
          // TODO: switch to use cglib proxy via setTargetClass/setProxyTargetClass
  
          return (EntityManager) proxyFactory.getProxy();
      }
  
      @RequiredArgsConstructor
      private static class EntityManagerMethodInterceptor implements MethodInterceptor {
  
          private final StateListener stateListener;
  
          private final Identifier identifier;
  
          @Override
          public Object invoke(MethodInvocation methodInvocation) throws Throwable {
              Object result = methodInvocation.proceed();
  
              if (methodInvocation.getMethod().getName().equals("close")) {
                  stateListener.entityManagerClosed(identifier);
              }
  
              return result;
          }
      }
  }