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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.shardingsphere.proxy.frontend.netty;
19  
20  import io.netty.channel.ChannelInitializer;
21  import io.netty.channel.socket.SocketChannel;
22  import io.netty.handler.codec.protobuf.ProtobufDecoder;
23  import io.netty.handler.codec.protobuf.ProtobufEncoder;
24  import io.netty.handler.codec.protobuf.ProtobufVarint32FrameDecoder;
25  import io.netty.handler.codec.protobuf.ProtobufVarint32LengthFieldPrepender;
26  import org.apache.shardingsphere.data.pipeline.cdc.protocol.request.CDCRequest;
27  
28  /**
29   * CDC server handler initializer.
30   */
31  public final class CDCServerHandlerInitializer extends ChannelInitializer<SocketChannel> {
32      
33      @Override
34      protected void initChannel(final SocketChannel channel) {
35          channel.pipeline().addLast(new ProtobufVarint32FrameDecoder());
36          channel.pipeline().addLast(new ProtobufDecoder(CDCRequest.getDefaultInstance()));
37          channel.pipeline().addLast(new ProtobufVarint32LengthFieldPrepender());
38          channel.pipeline().addLast(new ProtobufEncoder());
39          channel.pipeline().addLast(new CDCChannelInboundHandler());
40      }
41  }