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 backtype.storm.messaging;
  
  public abstract class ConnectionWithStatus implements IConnection {
  
      public enum Status {
  
          /**
           * we are establishing a active connection with target host.
           * The new data sending request can be buffered for future sending, or dropped(cases like
           * there is no enough memory). It varies with difference IConnection implementations.
           */
          Connecting,
  
          /**
           * We have a alive connection channel, which can be used to transfer data.
           */
          Ready,
  
          /**
           * The connection channel is closed or being closed. We don't accept further data sending or receiving.
           * All data sending request will be dropped.
           */
          Closed
      }
  
      /**
       * whether this connection is available to transfer data
       */
      public abstract Status status();
  
  }