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 org.apache.cassandra.streaming;
  
  import java.util.List;
  
  import org.apache.cassandra.dht.Range;
  import org.apache.cassandra.dht.Token;
  import org.apache.cassandra.schema.TableId;
  
  /**
   * StreamTask is an abstraction of the streaming task performed over specific ColumnFamily.
   */
  public abstract class StreamTask
  {
      /** StreamSession that this task belongs */
      protected final StreamSession session;
  
      protected final TableId tableId;
  
      protected StreamTask(StreamSession session, TableId tableId)
      {
          this.session = session;
          this.tableId = tableId;
      }
  
      /**
       * @return total number of files this task receives/streams.
       */
      public abstract int getTotalNumberOfFiles();
  
      /**
       * @return total bytes expected to receive
       */
      public abstract long getTotalSize();
  
      /**
       * Abort the task.
       * Subclass should implement cleaning up resources.
       */
      public abstract void abort();
  
      protected abstract List<Range<Token>> ranges();
  
      /**
       * @return StreamSummary that describes this task
       */
      public StreamSummary getSummary()
      {
          return new StreamSummary(tableId, ranges(), getTotalNumberOfFiles(), getTotalSize());
      }
  }
  