openflow-protocol-impl/src/main/java/org/opendaylight/openflowjava/protocol/impl/core/OFDecoder.java

   1 /*
   2  * Copyright (c) 2013 Pantheon Technologies s.r.o. 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
   9 package org.opendaylight.openflowjava.protocol.impl.core;
  10
  11 import io.netty.channel.ChannelHandlerContext;
  12 import io.netty.handler.codec.MessageToMessageDecoder;
  13
  14 import java.util.List;
  15
  16 import org.opendaylight.openflowjava.protocol.impl.deserialization.DeserializationFactory;
  17 import org.opendaylight.openflowjava.statistics.CounterEventTypes;
  18 import org.opendaylight.openflowjava.statistics.StatisticsCounters;
  19 import org.opendaylight.openflowjava.util.ByteBufUtils;
  20 import org.opendaylight.yangtools.yang.binding.DataObject;
  21 import org.slf4j.Logger;
  22 import org.slf4j.LoggerFactory;
  23
  24 /**
  25  * Transforms OpenFlow Protocol messages to POJOs
  26  * @author michal.polkorab
  27  */
  28 public class OFDecoder extends MessageToMessageDecoder<VersionMessageWrapper> {
  29
  30     private static final Logger LOGGER = LoggerFactory.getLogger(OFDecoder.class);
  31     private DeserializationFactory deserializationFactory;
  32     private StatisticsCounters statisticsCounter;
  33     /**
  34      * Constructor of class
  35      */
  36     public OFDecoder() {
  37         LOGGER.trace("Creating OF 1.3 Decoder");
  38         statisticsCounter = StatisticsCounters.getInstance();
  39     }
  40
  41     @Override
  42     protected void decode(ChannelHandlerContext ctx, VersionMessageWrapper msg,
  43             List<Object> out) throws Exception {
  44         if (LOGGER.isDebugEnabled()) {
  45             LOGGER.debug("VersionMessageWrapper received");
  46             LOGGER.debug("<< " + ByteBufUtils.byteBufToHexString(msg.getMessageBuffer()));
  47         }
  48
  49         DataObject dataObject = null;
  50         try {
  51             dataObject = deserializationFactory.deserialize(msg.getMessageBuffer(),
  52                     msg.getVersion());
  53             if (dataObject == null) {
  54                 LOGGER.warn("Translated POJO is null");
  55                 statisticsCounter.incrementCounter(CounterEventTypes.US_DECODE_FAIL);
  56             } else {
  57                 out.add(dataObject);
  58                 statisticsCounter.incrementCounter(CounterEventTypes.US_DECODE_SUCCESS);
  59             }
  60         } catch(Exception e) {
  61             LOGGER.warn("Message deserialization failed");
  62             LOGGER.warn(e.getMessage(), e);
  63             statisticsCounter.incrementCounter(CounterEventTypes.US_DECODE_FAIL);
  64         } finally {
  65             msg.getMessageBuffer().release();
  66         }
  67     }
  68
  69     /**
  70      * @param deserializationFactory
  71      */
  72     public void setDeserializationFactory(DeserializationFactory deserializationFactory) {
  73         this.deserializationFactory = deserializationFactory;
  74     }
  75
  76 }