framework/src/main/java/org/opendaylight/protocol/framework/ProtocolMessageDecoder.java

   1 /*
   2  * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.protocol.framework;
   9
  10 import io.netty.buffer.ByteBuf;
  11 import io.netty.channel.ChannelHandlerContext;
  12 import io.netty.handler.codec.ByteToMessageDecoder;
  13
  14 import java.util.Arrays;
  15 import java.util.List;
  16
  17 import org.slf4j.Logger;
  18 import org.slf4j.LoggerFactory;
  19
  20 public final class ProtocolMessageDecoder<T extends ProtocolMessage> extends ByteToMessageDecoder {
  21
  22         private final static Logger logger = LoggerFactory.getLogger(ProtocolMessageDecoder.class);
  23
  24         private final ProtocolMessageFactory<T> factory;
  25
  26         public ProtocolMessageDecoder(final ProtocolMessageFactory<T> factory) {
  27                 this.factory = factory;
  28         }
  29
  30         @Override
  31         protected void decode(final ChannelHandlerContext ctx, final ByteBuf in, final List<Object> out) throws Exception {
  32                 if (in.readableBytes() == 0) {
  33                         logger.debug("No more content in incoming buffer.");
  34                         return;
  35                 }
  36                 in.markReaderIndex();
  37                 try {
  38                         final byte[] bytes = new byte[in.readableBytes()];
  39                         in.readBytes(bytes);
  40                         logger.debug("Received to decode: {}", Arrays.toString(bytes));
  41                         out.addAll(this.factory.parse(bytes));
  42                 } catch (DeserializerException | DocumentedException e) {
  43                         logger.debug("Failed to decode protocol message", e);
  44                         this.exceptionCaught(ctx, e);
  45                 }
  46                 in.discardReadBytes();
  47         }
  48 }