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/*
 * Copyright DataStax, Inc.
 *
 * Licensed 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 com.datastax.driver.core;

import com.codahale.metrics.Meter;
import com.datastax.driver.$internal.io.netty.buffer.ByteBuf;
import com.datastax.driver.$internal.io.netty.channel.ChannelHandler.Sharable;
import com.datastax.driver.$internal.io.netty.channel.ChannelHandlerContext;
import com.datastax.driver.$internal.io.netty.channel.ChannelInboundHandlerAdapter;

@Sharable
class InboundTrafficMeter extends ChannelInboundHandlerAdapter {

  private final Meter meter;

  InboundTrafficMeter(Meter meter) {
    this.meter = meter;
  }

  @Override
  public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
    if (msg instanceof ByteBuf) {
      meter.mark(((ByteBuf) msg).readableBytes());
    }
    super.channelRead(ctx, msg);
  }
}