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.spark.network.netty;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.channel.SimpleChannelInboundHandler;
  
  import org.apache.spark.storage.BlockId;
  
  abstract class FileClientHandler extends SimpleChannelInboundHandler<ByteBuf> {
  
    private FileHeader currentHeader = null;
  
    private volatile boolean handlerCalled = false;
  
    public boolean isComplete() {
      return handlerCalled;
    }
  
    public abstract void handle(ChannelHandlerContext ctx, ByteBuf in, FileHeader header);
    public abstract void handleError(BlockId blockId);
  
    @Override
    public void channelRead0(ChannelHandlerContext ctx, ByteBuf in) {
      // get header
      if (currentHeader == null && in.readableBytes() >= FileHeader.HEADER_SIZE()) {
        currentHeader = FileHeader.create(in.readBytes(FileHeader.HEADER_SIZE()));
      }
      // get file
      if(in.readableBytes() >= currentHeader.fileLen()) {
        handle(ctx, in, currentHeader);
        handlerCalled = true;
        currentHeader = null;
        ctx.close();
      }
    }
  
  }
  
  