KaaTcpDecoder.java

/*
 * Copyright 2014-2016 CyberVision, Inc.
 *
 * Licensed 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.kaaproject.kaa.server.transports.tcp.transport.netty;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;

import org.kaaproject.kaa.common.channels.protocols.kaatcp.messages.MessageFactory;
import org.kaaproject.kaa.common.channels.protocols.kaatcp.messages.MqttFrame;
import org.kaaproject.kaa.server.common.server.KaaCommandProcessor;
import org.kaaproject.kaa.server.common.server.KaaCommandProcessorFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Arrays;

/**
 * KaaTcpDecoder Class.
 *
 * @author Yaroslav Zeygerman
 */
public class KaaTcpDecoder extends SimpleChannelInboundHandler<byte[]> {
  public static final String KAA_TCP_COMMAND_NAME = "KaaTcp";
  private static final Logger LOG = LoggerFactory.getLogger(KaaTcpDecoder.class);
  private ChannelHandlerContext currentCtx;
  private KaaCommandProcessorFactory<MqttFrame, MqttFrame> commandFactory;
  private final MessageFactory messageFactory = new MessageFactory() {
    @Override
    public void onMqttFrame(MqttFrame frame) {
      try {
        KaaCommandProcessor<MqttFrame, MqttFrame> processor =
                commandFactory.createCommandProcessor();
        processFrame(frame, processor);
      } catch (Exception processKaaTcpFrameException) {
        LOG.error("Failed to process KaaTcp frame {}: {}",
                frame.getMessageType(), processKaaTcpFrameException);
      }
      super.onMqttFrame(frame);
    }
  };

  public KaaTcpDecoder(KaaCommandProcessorFactory<MqttFrame, MqttFrame> commandFactory) {
    super();
    this.commandFactory = commandFactory;
  }

  private void processFrame(MqttFrame frame, KaaCommandProcessor<MqttFrame, MqttFrame> processor)
          throws Exception {
    processor.setRequest(frame);
    currentCtx.fireChannelRead(processor);
  }

  public void channelReadCompete(ChannelHandlerContext ctx) throws Exception { // NOSONAR
    ctx.flush();
  }

  @Override
  protected void channelRead0(ChannelHandlerContext ctx, byte[] data) throws Exception {
    if (LOG.isTraceEnabled()) {
      LOG.trace("channelRead0: {}", Arrays.toString(data));
    }
    currentCtx = ctx;
    messageFactory.getFramer().pushBytes(data);
  }

}