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.camel.component.lumberjack.io;
  
  import java.io.IOException;
  
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.channel.SimpleChannelInboundHandler;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * This handler connects the Netty pipeline to the Camel endpoint.
   */
  final class LumberjackMessageHandler extends SimpleChannelInboundHandler<LumberjackWindow> {
      private static final Logger LOG = LoggerFactory.getLogger(LumberjackMessageHandler.class);
  
      private final LumberjackMessageProcessor messageProcessor;
  
      private volatile boolean process = true;
  
      LumberjackMessageHandler(LumberjackMessageProcessor messageProcessor) {
          this.messageProcessor = messageProcessor;
      }
  
      @Override
      public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
          if (cause instanceof IOException) {
              LOG.debug("IO exception (client connection closed ?)", cause);
          } else {
              LOG.warn("Caught an exception while reading, closing channel.", cause);
          }
          ctx.close();
      }
  
      @Override
      protected void channelRead0(ChannelHandlerContext ctx, LumberjackWindow window) throws Exception {
          try {
              for (LumberjackMessage msg : window) {
                  if (process) {
                      messageProcessor.onMessageReceived(msg.getPayload(), success -> {
                          if (success) {
                              notifyMessageProcessed(ctx, msg.getSequenceNumber(), window);
                          } else {
                              ctx.close();
                              // Mark that we shouldn't process the next messages that are already decoded and are waiting in netty queues
                              process = false;
                          }
                      });
                  }
              }
          } finally {
              ctx.flush();
          }
      }
  
      /**
       * Notify message processed if end of window
       *
       * @param ctx
       * @param sequenceNumber
       * @param window
       */
      private void notifyMessageProcessed(ChannelHandlerContext ctx, int sequenceNumber, LumberjackWindow window) {
          if (sequenceNumber == window.getSize()) {
              ctx.writeAndFlush(new LumberjackAck(window.getVersion(), sequenceNumber));
          }
      }
  
  }
  