bgp/rib-impl/src/main/java/org/opendaylight/protocol/bgp/rib/impl/BGPByteToMessageDecoder.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.bgp.rib.impl;
   9
  10 import io.netty.buffer.ByteBuf;
  11 import io.netty.buffer.ByteBufUtil;
  12 import io.netty.channel.ChannelHandlerContext;
  13 import io.netty.handler.codec.ByteToMessageDecoder;
  14
  15 import java.util.List;
  16
  17 import org.opendaylight.protocol.bgp.parser.BGPDocumentedException;
  18 import org.opendaylight.protocol.bgp.parser.BGPParsingException;
  19 import org.opendaylight.protocol.bgp.parser.spi.MessageRegistry;
  20 import org.slf4j.Logger;
  21 import org.slf4j.LoggerFactory;
  22
  23 import com.google.common.base.Preconditions;
  24
  25 /**
  26  *
  27  */
  28 final class BGPByteToMessageDecoder extends ByteToMessageDecoder {
  29         private static final Logger LOG = LoggerFactory.getLogger(BGPByteToMessageDecoder.class);
  30         private final MessageRegistry registry;
  31
  32         public BGPByteToMessageDecoder(final MessageRegistry registry) {
  33                 this.registry = Preconditions.checkNotNull(registry);
  34         }
  35
  36         @Override
  37         protected void decode(final ChannelHandlerContext ctx, final ByteBuf in, final List<Object> out) throws Exception {
  38                 if (in.readableBytes() == 0) {
  39                         LOG.debug("No more content in incoming buffer.");
  40                         return;
  41                 }
  42                 in.markReaderIndex();
  43                 try {
  44                         LOG.trace("Received to decode: {}", ByteBufUtil.hexDump(in));
  45                         final byte[] bytes = new byte[in.readableBytes()];
  46                         in.readBytes(bytes);
  47                         out.add(this.registry.parseMessage(bytes));
  48                 } catch (BGPParsingException | BGPDocumentedException e) {
  49                         LOG.debug("Failed to decode protocol message", e);
  50                         this.exceptionCaught(ctx, e);
  51                 }
  52                 in.discardReadBytes();
  53         }
  54 }