zhijiangW commented on a change in pull request #7368: [FLINK-10742][network] Let Netty use Flink's buffers directly in credit-based mode URL: https://github.com/apache/flink/pull/7368#discussion_r381871433
########## File path: flink-runtime/src/main/java/org/apache/flink/runtime/io/network/netty/BufferResponseDecoderDelegate.java ########## @@ -0,0 +1,117 @@ +/* + * 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.flink.runtime.io.network.netty; + +import org.apache.flink.runtime.io.network.NetworkClientHandler; +import org.apache.flink.shaded.netty4.io.netty.buffer.ByteBuf; +import org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandlerContext; + +import static org.apache.flink.runtime.io.network.netty.NettyMessage.BufferResponse; + +/** + * The parser for {@link org.apache.flink.runtime.io.network.netty.NettyMessage.BufferResponse}. + */ +public class BufferResponseDecoderDelegate implements NettyMessageDecoderDelegate { + + /** The network client handler of current channel. */ + private final NetworkClientHandler networkClientHandler; + + /** The Flink Buffer allocator. */ + private final NetworkBufferAllocator allocator; + + /** The cumulation buffer of message header. */ + private ByteBuf messageHeaderBuffer; + + /** + * The current BufferResponse message that are process the buffer part. + * If it is null, we are still processing the message header part, otherwise + * we are processing the buffer part. + */ + private BufferResponse currentResponse; + + /** How much bytes have been received or discarded for the buffer part. */ + private int decodedBytesOfBuffer; + + public BufferResponseDecoderDelegate(NetworkClientHandler networkClientHandler) { + this.networkClientHandler = networkClientHandler; + this.allocator = new NetworkBufferAllocator(networkClientHandler); + } + + @Override + public void onChannelActive(ChannelHandlerContext ctx) { + messageHeaderBuffer = ctx.alloc().directBuffer(BufferResponse.MESSAGE_HEADER_LENGTH); + } + + @Override + public void startParsingMessage(int msgId, int messageLength) { Review comment: Actually we rely on this method only to reset the states every time, and the passed argument for this class is not meaningful. Considering the reset function, we can do it inside `onChannelRead` before returning the complete result, and it would be more safe to rely on itself instead of relying on the outside caller. Then we can migrate the `startParsingMessage` method into abstract `NettyMessageDecoderDelegate` class, and define the protected vars `msgId`, `messageLength` to be referenced directly for subclasses if necessary. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services
