content: /*
   * This library is part of OpenCms -
   * the Open Source Content Management System
   *
   * Copyright (c) Alkacon Software GmbH & Co. KG (https://www.alkacon.com)
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library 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
   * Lesser General Public License for more details.
   *
   * For further information about Alkacon Software, please see the
   * company website: https://www.alkacon.com
   *
   * For further information about OpenCms, please see the
   * project website: https://www.opencms.org
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  
  package org.opencms.gwt.client.rpc;
  
  import org.opencms.gwt.client.CmsCoreProvider;
  import org.opencms.gwt.shared.rpc.I_CmsLogService;
  import org.opencms.gwt.shared.rpc.I_CmsLogServiceAsync;
  
  import com.google.gwt.core.client.GWT;
  import com.google.gwt.core.client.Scheduler;
  import com.google.gwt.core.client.Scheduler.ScheduledCommand;
  import com.google.gwt.user.client.rpc.AsyncCallback;
  import com.google.gwt.user.client.rpc.ServiceDefTarget;
  
  /**
   * Handles client side logging.<p>
   *
   * @since 8.0.0
   *
   * @see org.opencms.gwt.CmsLogService
   * @see org.opencms.gwt.shared.rpc.I_CmsLogService
   * @see org.opencms.gwt.shared.rpc.I_CmsLogServiceAsync
   */
  public final class CmsLog {
  
      /** The service instance. */
      private static I_CmsLogServiceAsync m_loggingService;
  
      /**
       * Prevent instantiation.<p>
       */
      private CmsLog() {
  
          // Prevent instantiation
      }
  
      /**
       * Logs client messages on the server.<p>
       *
       * @param message the message to log
       *
       * @return the generated ticket
       */
      public static String log(final String message) {
  
          final String ticket = String.valueOf(System.currentTimeMillis());
          // using a deferred command just to be more responsible
          // since we do not expect any feed back from it
          Scheduler.get().scheduleDeferred(new ScheduledCommand() {
  
              /**
               * @see com.google.gwt.user.client.Command#execute()
               */
              public void execute() {
  
                  getLoggingService().log(ticket, message, new AsyncCallback<Void>() {
  
                      /**
                       * @see com.google.gwt.user.client.rpc.AsyncCallback#onFailure(java.lang.Throwable)
                       */
                      public void onFailure(Throwable caught) {
  
                          // logging failed, really bad
                          // but the only thing we can do is to ignore it
                      }
  
                      /**
                       * @see com.google.gwt.user.client.rpc.AsyncCallback#onSuccess(Object)
                       */
                      public void onSuccess(Void result) {
  
                          // logged successfully
                      }
                  });
              }
          });
          return ticket;
      }
  
      /**
       * Returns the service instance, using lazy initialization.<p>
       *
       * @return the service instance
       */
      protected static I_CmsLogServiceAsync getLoggingService() {
  
          if (m_loggingService == null) {
              m_loggingService = GWT.create(I_CmsLogService.class);
              String serviceUrl = CmsCoreProvider.get().link("org.opencms.gwt.CmsLogService.gwt");
              ((ServiceDefTarget)m_loggingService).setServiceEntryPoint(serviceUrl);
  
          }
          return m_loggingService;
      }
  }