code: /*
   * 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.skywalking.oap.server.core.cache;
  
  import com.google.common.cache.Cache;
  import com.google.common.cache.CacheBuilder;
  import java.util.List;
  import lombok.extern.slf4j.Slf4j;
  import org.apache.skywalking.oap.server.core.CoreModuleConfig;
  import org.apache.skywalking.oap.server.core.analysis.manual.networkalias.NetworkAddressAlias;
  import org.apache.skywalking.oap.server.library.module.Service;
  
  /**
   * NetworkAddressAliasCache set the temporary network address - service/instance mapping in the memory cache. This data
   * was original analysis from reference of trace span.
   */
  @Slf4j
  public class NetworkAddressAliasCache implements Service {
      private final Cache<String, NetworkAddressAlias> networkAddressAliasCache;
  
      public NetworkAddressAliasCache(CoreModuleConfig moduleConfig) {
          long initialSize = moduleConfig.getMaxSizeOfNetworkAddressAlias() / 10L;
          int initialCapacitySize = (int) (initialSize > Integer.MAX_VALUE ? Integer.MAX_VALUE : initialSize);
  
          networkAddressAliasCache = CacheBuilder.newBuilder()
                                                 .initialCapacity(initialCapacitySize)
                                                 .maximumSize(moduleConfig.getMaxSizeOfNetworkAddressAlias())
                                                 .build();
      }
  
      /**
       * @return NULL if alias doesn't exist or has not been loaded in the cache.
       */
      public NetworkAddressAlias get(String address) {
          return networkAddressAliasCache.getIfPresent(address);
      }
  
      void load(List<NetworkAddressAlias> networkAddressAliasList) {
          networkAddressAliasList.forEach(networkAddressAlias -> {
              networkAddressAliasCache.put(networkAddressAlias.getAddress(), networkAddressAlias);
          });
      }
  
      long currentSize() {
          return networkAddressAliasCache.size();
      }
  }
  