content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * 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 com.alibaba.nacos.istio.common;
  
  import com.alibaba.nacos.istio.misc.IstioConfig;
  import com.alibaba.nacos.istio.model.IstioResources;
  import com.alibaba.nacos.istio.model.IstioService;
  
  import java.text.SimpleDateFormat;
  import java.util.Date;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.atomic.AtomicLong;
  
  /**
   * @author special.fy
   */
  public class ResourceSnapshot {
      private static AtomicLong versionSuffix = new AtomicLong(0);
      
      private final IstioResources istioResources;
      
      private IstioConfig istioConfig;
  
      private boolean isCompleted;
  
      private String version;
      
      public ResourceSnapshot(IstioConfig istioConfig) {
          isCompleted = false;
          istioResources = new IstioResources(new ConcurrentHashMap<String, IstioService>(16));
          this.istioConfig = istioConfig;
      }
  
      public synchronized void initResourceSnapshot(NacosResourceManager manager) {
          if (isCompleted) {
              return;
          }
  
          initIstioResources(manager);
  
          generateVersion();
  
          isCompleted = true;
      }
  
      private void generateVersion() {
          String time = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssXXX").format(new Date());
          version = time + "/" + versionSuffix.getAndIncrement();
      }
      
      private void initIstioResources(NacosResourceManager manager) {
          istioResources.setIstioServiceMap(manager.services());
      }
      
      public IstioResources getIstioResources() {
          return istioResources;
      }
      
      public IstioConfig getIstioConfig() {
          return istioConfig;
      }
      
      public boolean isCompleted() {
          return isCompleted;
      }
  
      public String getVersion() {
          return version;
      }
  }