content: /*
   *  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.
   *
   *  See the NOTICE file distributed with this work for additional
   *  information regarding copyright ownership.
   */
  
  package org.seaborne.delta.server.local;
  
  import java.util.concurrent.ConcurrentHashMap;
  
  import org.apache.jena.graph.Node;
  import org.seaborne.delta.Id;
  import org.apache.jena.rdfpatch.RDFPatch;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /** Server-wide cache of patches */
  public class PatchCache {
      private static Logger  LOG     = LoggerFactory.getLogger(PatchCache.class);
  
  //    private Cache<Node, RDFPatch> patchCache;
  //    private PatchCache() {
  //        patchCache = CacheFactory.createCache(DPConst.PATCH_CACHE_SIZE);
  //        patchCache.setDropHandler((node,patch)->LOG.info("Cache drop patch: "+Id.fromNode(node)));
  //    }
  
      private ConcurrentHashMap<Node, RDFPatch> patchCache;
      private PatchCache() {
          patchCache = new ConcurrentHashMap<>();
          //patchCache.setDropHandler((node,patch)->LOG.info("Cache drop patch: "+Id.fromNode(node)));
      }
      private static PatchCache singleton = new PatchCache();
  
      private static  PatchCache get() { return singleton ; }
  
      public RDFPatch get(Id id) {
          //return patchCache.getIfPresent(id.asNode());
          return patchCache.get(id.asNode());
      }
  
      public void put(Id id, RDFPatch patch) {
          put(id.asNode(), patch);
      }
  
      public void put(Node node, RDFPatch patch) {
          patchCache.put(node, patch);
      }
  }
  