content: /*
   * Copyright (C) 2012-2023 52°North Spatial Information Research GmbH
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 as published
   * by the Free Software Foundation.
   *
   * If the program is linked with libraries which are licensed under one of
   * the following licenses, the combination of the program with the linked
   * library is not considered a "derivative work" of the program:
   *
   *     - Apache License, version 2.0
   *     - Apache Software License, version 1.0
   *     - GNU Lesser General Public License, version 3
   *     - Mozilla Public License, versions 1.0, 1.1 and 2.0
   *     - Common Development and Distribution License (CDDL), version 1.0
   *
   * Therefore the distribution of the program linked with libraries licensed
   * under the aforementioned licenses, is permitted by the copyright holders
   * if the distribution is compliant with both the GNU General Public
   * License version 2 and the aforementioned licenses.
   *
   * This program is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
   * Public License for more details.
   */
  package org.n52.sos.aquarius.ds;
  
  import org.n52.faroe.ConfigurationError;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.aquaticinformatics.aquarius.sdk.timeseries.AquariusClient;
  import com.aquaticinformatics.aquarius.sdk.timeseries.servicemodels.Publish.GetKeepAlive;
  
  import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
  import net.servicestack.client.WebServiceException;
  
  @SuppressFBWarnings({ "EI_EXPOSE_REP", "EI_EXPOSE_REP2" })
  public class ClientHandler {
  
      private static final Logger LOGGER = LoggerFactory.getLogger(ClientHandler.class);
  
      private static final int MAX_ATTEMPTS = 3;
  
      private AquariusClient client;
  
      private AquariusConnection connection;
  
      public ClientHandler(AquariusConnection connection) {
              this.connection = connection;
          }
  
      public synchronized void establishConnection(int attempt) {
          establishConnection(connection, attempt);
      }
  
      private synchronized void establishConnection(AquariusConnection connection, int attempt) {
          try {
              this.client = AquariusClient.createConnectedClient(connection.getHost(), connection.getUsername(),
                      connection.getPassword());
          } catch (Exception ae) {
              if (attempt < MAX_ATTEMPTS) {
                  establishConnection(attempt + 1);
              }
              throw new ConfigurationError(
                      String.format("Error when establishing a connection to Aquarius for (%s, %s, %s)",
                              connection.getHost(), connection.getUsername(), connection.getPassword()),
                      ae);
          }
      }
  
      public synchronized void delete() throws Exception {
          if (this.client != null) {
              try {
                  this.client.close();
              } catch (WebServiceException e) {
                  if (e.getStatusCode() == 401) {
                      LOGGER.debug("Closing connection returns 401 - Unauthorized!");
                  } else {
                      throw e;
                  }
              }
          }
      }
  
      public synchronized void keepAlive() {
          this.client.Publish.get(new GetKeepAlive());
      }
  
      public synchronized AquariusClient getClient() {
          if (client == null) {
              establishConnection(0);
          }
          return client;
      }
  
  }
  