/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project 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 io.netty.example.udt.echo.rendezvous;

import com.yammer.metrics.Metrics;
import com.yammer.metrics.core.Meter;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.udt.UdtMessage;
import io.netty.channel.udt.nio.NioUdtProvider;

import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Handler implementation for the echo peer. It initiates the ping-pong traffic
 * between the echo peers by sending the first message to the other peer on
 * activation.
 */
public class MsgEchoPeerHandler extends
        SimpleChannelInboundHandler<UdtMessage> {

    private static final Logger log = Logger.getLogger(MsgEchoPeerHandler.class.getName());

    private final UdtMessage message;

    public MsgEchoPeerHandler(final int messageSize) {
        super(false);
        final ByteBuf byteBuf = Unpooled.buffer(messageSize);
        for (int i = 0; i < byteBuf.capacity(); i++) {
            byteBuf.writeByte((byte) i);
        }
        message = new UdtMessage(byteBuf);
    }

    final Meter meter = Metrics.newMeter(MsgEchoPeerHandler.class, "rate",
            "bytes", TimeUnit.SECONDS);

    @Override
    public void channelActive(final ChannelHandlerContext ctx) throws Exception {
        log.info("ECHO active " + NioUdtProvider.socketUDT(ctx.channel()).toStringOptions());
        ctx.writeAndFlush(message);
    }

    @Override
    public void exceptionCaught(final ChannelHandlerContext ctx,
            final Throwable cause) {
        log.log(Level.WARNING, "close the connection when an exception is raised", cause);
        ctx.close();
    }

    @Override
    public void channelRead0(ChannelHandlerContext ctx, UdtMessage message) throws Exception {
        meter.mark(message.content().readableBytes());

        ctx.write(message);
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
        ctx.flush();
    }
}