com.github.zhengframework.jpa.JpaPrivateModule Maven / Gradle / Ivy

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package com.github.zhengframework.jpa;

/*-
 * #%L
 * zheng-jpa
 * %%
 * Copyright (C) 2020 Zheng MingHai
 * %%
 * 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 com.github.zhengframework.guice.ExposedPrivateModule;
import com.google.inject.Key;
import com.google.inject.PrivateModule;
import com.google.inject.persist.PersistFilter;
import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import javax.persistence.spi.PersistenceUnitInfo;
import lombok.extern.slf4j.Slf4j;

@Slf4j
public class JpaPrivateModule extends PrivateModule {

  private final Annotation qualifier;

  private final JpaConfig jpaConfig;

  public JpaPrivateModule(Annotation qualifier, JpaConfig jpaConfig) {
    this.qualifier = qualifier;
    this.jpaConfig = jpaConfig;
    log.info("qualifier={}", qualifier);
  }

  @Override
  protected void configure() {

    install(new JpaInternalModule(jpaConfig));
    try {
      Class.forName("javax.servlet.Filter");
      if (qualifier == null) {
        Key key = Key.get(PersistFilter.class);
        bind(key).to(PersistFilter.class);
        expose(key);
      } else {
        Key key = Key.get(PersistFilter.class, qualifier);
        bind(key).to(PersistFilter.class);
        expose(key);
      }
    } catch (ClassNotFoundException ignored) {

    }
    Class[] classes = new Class[] {JpaManagedService.class, PersistenceUnitInfo.class};
    for (Class aClass : classes) {
      exposeClass(aClass);
    }

    Class extraModuleClass = jpaConfig.getExtraModuleClass();
    if (extraModuleClass != null) {
      try {
        ExposedPrivateModule module = extraModuleClass.getDeclaredConstructor().newInstance();
        log.info("install extra module: " + extraModuleClass.getName());
        install(module);
        for (Key key : module.getExposeList()) {
          exposeClass(key);
        }
      } catch (InstantiationException
          | IllegalAccessException
          | InvocationTargetException
          | NoSuchMethodException e) {
        throw new RuntimeException(e);
      }
    }
  }

  @SuppressWarnings({"unchecked", "rawtypes"})
  private void exposeClass(Class aClass) {
    if (qualifier != null) {
      bind(aClass).annotatedWith(qualifier).toProvider(binder().getProvider(aClass));
      expose(aClass).annotatedWith(qualifier);
    } else {
      expose(aClass);
    }
  }

  @SuppressWarnings({"unchecked", "rawtypes"})
  private void exposeClass(Key key) {
    if (qualifier != null) {
      bind(key.getTypeLiteral()).annotatedWith(qualifier).toProvider(binder().getProvider(key));
      expose(key.getTypeLiteral()).annotatedWith(qualifier);
    } else {
      expose(key.getTypeLiteral());
    }
  }
}