content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.apache.ambari.server.api;
  
  import java.io.IOException;
  
  import jakarta.servlet.Filter;
  import jakarta.servlet.FilterChain;
  import jakarta.servlet.FilterConfig;
  import jakarta.servlet.ServletException;
  import jakarta.servlet.ServletRequest;
  import jakarta.servlet.ServletResponse;
  
  import com.google.inject.Inject;
  import com.google.inject.Singleton;
  import com.google.inject.persist.UnitOfWork;
  
  /**
   * Replacement for Guice built-in PersistFilter as PersistService is started on Ambari start
   */
  @Singleton
  public class AmbariPersistFilter implements Filter {
    private final UnitOfWork unitOfWork;
  
    @Inject
    public AmbariPersistFilter(UnitOfWork unitOfWork) {
      this.unitOfWork = unitOfWork;
    }
  
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }
  
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
      unitOfWork.begin();
      try {
        filterChain.doFilter(servletRequest, servletResponse);
      } finally {
        unitOfWork.end();
      }
    }
  
    @Override
    public void destroy() {
    }
  }
  