server/src/main/java/org/apache/uniffle/server/netty/StreamServerMetricHandler.java

/*
 * 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.server.netty;

import io.netty.channel.ChannelDuplexHandler;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;

import org.apache.uniffle.common.metrics.NettyMetrics;

@ChannelHandler.Sharable
public class StreamServerMetricHandler extends ChannelDuplexHandler {

  private final NettyMetrics nettyMetrics;

  public StreamServerMetricHandler(NettyMetrics nettyMetrics) {
    this.nettyMetrics = nettyMetrics;
  }

  @Override
  public void channelActive(ChannelHandlerContext ctx) throws Exception {
    nettyMetrics.getGaugeNettyActiveConn().inc();
    super.channelActive(ctx);
  }

  @Override
  public void channelInactive(ChannelHandlerContext ctx) throws Exception {
    nettyMetrics.getGaugeNettyActiveConn().dec();
    super.channelInactive(ctx);
  }

  @Override
  public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
    nettyMetrics.getCounterNettyException().inc();
    super.exceptionCaught(ctx, cause);
  }
}