/*
    * Copyright 2016 the original author or authors.
    *
    * 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.
   */
  package org.openehealth.ipf.boot.hl7v3;
  
  
  import org.openehealth.ipf.commons.ihe.hl7v3.storage.Hl7v3ContinuationStorage;
  import org.springframework.cache.Cache;
  import org.springframework.cache.CacheManager;
  
  /**
   * Hl7v3ContinuationStorage that uses a Spring cache abstraction
   *
   * @author Christian Ohr
   * @since 3.2
   */
  public class CachingHl7v3ContinuationStorage implements Hl7v3ContinuationStorage {
  
      private static final String INTERACTIVE_CONTINUATION_CACHE = "interactiveHl7v3ContinuationCache";
  
      private final Cache cache;
  
      private static final String MESSAGE_SUFFIX = ".message";
      private static final String LAST_RESULT_NUMBER_SUFFIX = ".lastIndex";
      private static final String CONTINUATION_QUANTITY_SUFFIX = ".quantity";
  
      CachingHl7v3ContinuationStorage(CacheManager cacheManager) {
          this.cache = cacheManager.getCache(INTERACTIVE_CONTINUATION_CACHE);
      }
  
      @Override
      public void storeMessage(String key, String message) {
          cache.put(key + MESSAGE_SUFFIX, message);
      }
  
      @Override
      public String getMessage(String key) {
          return cache.get(key + MESSAGE_SUFFIX, String.class);
      }
  
      @Override
      public void storeLastResultNumber(String key, int lastResultNumber) {
          cache.put(key + LAST_RESULT_NUMBER_SUFFIX, lastResultNumber);
      }
  
      @Override
      public int getLastResultNumber(String key) {
          Integer i = cache.get(key + LAST_RESULT_NUMBER_SUFFIX, Integer.class);
          return (i != null) ? i : -1;
      }
  
      @Override
      public void storeContinuationQuantity(String key, int continuationQuantity) {
          cache.put(key + CONTINUATION_QUANTITY_SUFFIX, continuationQuantity);
      }
  
      @Override
      public int getContinuationQuantity(String key) {
          Integer i = cache.get(key + CONTINUATION_QUANTITY_SUFFIX, Integer.class);
          return (i != null) ? i : -1;
      }
  
      @Override
      public boolean remove(String key) {
          cache.evict(key + LAST_RESULT_NUMBER_SUFFIX);
          cache.evict(key + CONTINUATION_QUANTITY_SUFFIX);
          if (cache.get(key + MESSAGE_SUFFIX) != null) {
              cache.evict(key + MESSAGE_SUFFIX);
              return true;
          }
          return false;
      }
  
  }