/*
    * 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.syncope.sra.session;
  
  import org.apache.syncope.sra.SessionConfig;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.cache.CacheManager;
  import org.springframework.session.MapSession;
  import org.springframework.session.ReactiveSessionRepository;
  import reactor.core.publisher.Mono;
  
  public class CacheManagerReactiveSessionRepository implements ReactiveSessionRepository<MapSession> {
  
      @Autowired
      private CacheManager cacheManager;
  
      @Override
      public Mono<MapSession> createSession() {
          return Mono.just(new MapSession());
      }
  
      @Override
      public Mono<Void> save(final MapSession session) {
          return Mono.fromRunnable(() -> {
              if (!session.getId().equals(session.getOriginalId())) {
                  cacheManager.getCache(SessionConfig.DEFAULT_CACHE).evictIfPresent(session.getOriginalId());
              }
              cacheManager.getCache(SessionConfig.DEFAULT_CACHE).put(session.getId(), session);
          });
      }
  
      @Override
      public Mono<MapSession> findById(final String id) {
          return Mono.defer(() -> Mono.justOrEmpty(
                  cacheManager.getCache(SessionConfig.DEFAULT_CACHE).get(id, MapSession.class)).
                  map(MapSession::new).
                  switchIfEmpty(deleteById(id).then(Mono.empty())));
      }
  
      @Override
      public Mono<Void> deleteById(final String id) {
          return Mono.fromRunnable(() -> cacheManager.getCache(SessionConfig.DEFAULT_CACHE).evictIfPresent(id));
      }
  }