[GitHub] [incubator-uniffle] leixm commented on a diff in pull request #727: [#133] feat(netty): add Netty Utils

["leixm (via GitHub)" <gi...@apache.org>]

leixm commented on code in PR #727:
URL: https://github.com/apache/incubator-uniffle/pull/727#discussion_r1141041258


##########
common/src/main/java/org/apache/uniffle/common/util/NettyUtils.java:
##########
@@ -0,0 +1,115 @@
+/*
+ * 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.uniffle.common.util;
+
+import java.util.concurrent.ThreadFactory;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.PooledByteBufAllocator;
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelFuture;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.EventLoopGroup;
+import io.netty.channel.epoll.EpollEventLoopGroup;
+import io.netty.channel.epoll.EpollSocketChannel;
+import io.netty.channel.nio.NioEventLoopGroup;
+import io.netty.channel.socket.nio.NioSocketChannel;
+import io.netty.util.internal.PlatformDependent;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.apache.uniffle.common.netty.IOMode;
+import org.apache.uniffle.common.netty.protocol.Message;
+
+public class NettyUtils {
+  private static final Logger logger = LoggerFactory.getLogger(NettyUtils.class);
+
+  /** Creates a Netty EventLoopGroup based on the IOMode. */
+  public static EventLoopGroup createEventLoop(IOMode mode, int numThreads, String threadPrefix) {
+    ThreadFactory threadFactory = ThreadUtils.getNettyThreadFactory(threadPrefix);
+
+    switch (mode) {
+      case NIO:
+        return new NioEventLoopGroup(numThreads, threadFactory);
+      case EPOLL:
+        return new EpollEventLoopGroup(numThreads, threadFactory);
+      default:
+        throw new IllegalArgumentException("Unknown io mode: " + mode);
+    }
+  }
+
+  /** Returns the correct (client) SocketChannel class based on IOMode. */
+  public static Class<? extends Channel> getClientChannelClass(IOMode mode) {
+    switch (mode) {
+      case NIO:
+        return NioSocketChannel.class;
+      case EPOLL:
+        return EpollSocketChannel.class;
+      default:
+        throw new IllegalArgumentException("Unknown io mode: " + mode);
+    }
+  }
+
+  public static PooledByteBufAllocator createPooledByteBufAllocator(
+      boolean allowDirectBufs, boolean allowCache, int numCores) {
+    if (numCores == 0) {
+      numCores = Runtime.getRuntime().availableProcessors();
+    }
+    return new PooledByteBufAllocator(
+        allowDirectBufs && PlatformDependent.directBufferPreferred(),
+        Math.min(PooledByteBufAllocator.defaultNumHeapArena(), numCores),
+        Math.min(PooledByteBufAllocator.defaultNumDirectArena(), allowDirectBufs ? numCores : 0),
+        PooledByteBufAllocator.defaultPageSize(),
+        PooledByteBufAllocator.defaultMaxOrder(),
+        allowCache ? PooledByteBufAllocator.defaultSmallCacheSize() : 0,
+        allowCache ? PooledByteBufAllocator.defaultNormalCacheSize() : 0,
+        allowCache && PooledByteBufAllocator.defaultUseCacheForAllThreads());
+  }
+
+  /** Returns the remote address on the channel or "&lt;unknown remote&gt;" if none exists. */
+  public static String getRemoteAddress(Channel channel) {
+    if (channel != null && channel.remoteAddress() != null) {
+      return channel.remoteAddress().toString();
+    }
+    return "<unknown remote>";
+  }
+
+  public static ChannelFuture writeResponseMsg(ChannelHandlerContext ctx, Message msg, boolean doWriteType) {
+    ByteBuf responseMsgBuf = ctx.alloc().buffer(1000);

Review Comment:
   In fact, we can use encodeLength as the initial size, which is the determined size, and all Messages will implement this method.



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