content: // 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 com.cloud.storage.download;
  
  
  import org.apache.cloudstack.storage.command.DownloadProgressCommand.RequestType;
  
  import com.cloud.agent.api.storage.DownloadAnswer;
  import com.cloud.storage.VMTemplateStorageResourceAssoc.Status;
  import org.apache.logging.log4j.Level;
  
  public class DownloadErrorState extends DownloadInactiveState {
  
      public DownloadErrorState(DownloadListener dl) {
          super(dl);
      }
  
      @Override
      public String handleAnswer(DownloadAnswer answer) {
          switch (answer.getDownloadStatus()) {
              case DOWNLOAD_IN_PROGRESS:
                  getDownloadListener().scheduleStatusCheck(RequestType.GET_STATUS);
                  return Status.DOWNLOAD_IN_PROGRESS.toString();
              case DOWNLOADED:
                  getDownloadListener().scheduleImmediateStatusCheck(RequestType.PURGE);
                  getDownloadListener().cancelTimeoutTask();
                  return Status.DOWNLOADED.toString();
              case NOT_DOWNLOADED:
                  getDownloadListener().scheduleStatusCheck(RequestType.GET_STATUS);
                  return Status.NOT_DOWNLOADED.toString();
              case DOWNLOAD_ERROR:
                  getDownloadListener().cancelStatusTask();
                  getDownloadListener().cancelTimeoutTask();
                  return Status.DOWNLOAD_ERROR.toString();
              case UNKNOWN:
                  getDownloadListener().cancelStatusTask();
                  getDownloadListener().cancelTimeoutTask();
                  return Status.DOWNLOAD_ERROR.toString();
              default:
                  return null;
          }
      }
  
      @Override
      public String handleAbort() {
          return Status.ABANDONED.toString();
      }
  
      @Override
      public String getName() {
          return Status.DOWNLOAD_ERROR.toString();
      }
  
      @Override
      public void onEntry(String prevState, DownloadEvent event, Object evtObj) {
          super.onEntry(prevState, event, evtObj);
          if (event == DownloadEvent.DISCONNECT) {
              getDownloadListener().logDisconnect();
              getDownloadListener().cancelStatusTask();
              getDownloadListener().cancelTimeoutTask();
              DownloadAnswer answer = new DownloadAnswer("Storage agent or storage VM disconnected", Status.DOWNLOAD_ERROR);
              getDownloadListener().callback(answer);
              getDownloadListener().log("Entering download error state because the storage host disconnected", Level.WARN);
          } else if (event == DownloadEvent.TIMEOUT_CHECK) {
              DownloadAnswer answer = new DownloadAnswer("Timeout waiting for response from storage host", Status.DOWNLOAD_ERROR);
              getDownloadListener().callback(answer);
              getDownloadListener().log("Entering download error state: timeout waiting for response from storage host", Level.WARN);
          }
          getDownloadListener().setDownloadInactive(Status.DOWNLOAD_ERROR);
      }
  
  }
  