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.naming.core.v2.client.impl;
  
  import com.alibaba.nacos.naming.core.v2.client.AbstractClient;
  import com.alibaba.nacos.naming.misc.ClientConfig;
  
  /**
   * Nacos naming client based on tcp session.
   *
   * <p>The client is bind to the tcp session. When the tcp session disconnect, the client should be clean.
   *
   * @author xiweng.yy
   */
  public class ConnectionBasedClient extends AbstractClient {
      
      private final String connectionId;
      
      /**
       * {@code true} means this client is directly connect to current server. {@code false} means this client is synced
       * from other server.
       */
      private final boolean isNative;
      
      /**
       * Only has meaning when {@code isNative} is false, which means that the last time verify from source server.
       */
      private volatile long lastRenewTime;
      
      public ConnectionBasedClient(String connectionId, boolean isNative, Long revision) {
          super(revision);
          this.connectionId = connectionId;
          this.isNative = isNative;
          lastRenewTime = getLastUpdatedTime();
      }
      
      @Override
      public String getClientId() {
          return connectionId;
      }
      
      @Override
      public boolean isEphemeral() {
          return true;
      }
      
      public boolean isNative() {
          return isNative;
      }
      
      public long getLastRenewTime() {
          return lastRenewTime;
      }
      
      public void setLastRenewTime() {
          this.lastRenewTime = System.currentTimeMillis();
      }
      
      @Override
      public boolean isExpire(long currentTime) {
          return !isNative() && currentTime - getLastRenewTime() > ClientConfig.getInstance().getClientExpiredTime();
      }
      
      @Override
      public long recalculateRevision() {
          return revision.addAndGet(1);
      }
  }
  