sailfish.remoting.handler.HeartbeatChannelHandler.java Source code

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Here is the source code for sailfish.remoting.handler.HeartbeatChannelHandler.java

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/**
 *
 *   Copyright 2016-2016 spccold
 *
 *   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 sailfish.remoting.handler;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import io.netty.channel.ChannelDuplexHandler;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.timeout.IdleStateEvent;
import sailfish.remoting.constants.ChannelAttrKeys;
import sailfish.remoting.protocol.RequestProtocol;
import sailfish.remoting.utils.ChannelUtil;

/**
 * @author spccold
 * @version $Id: HeartbeatHandler.java, v 0.1 20161123 ?9:21:35 spccold Exp $
 */
@ChannelHandler.Sharable
public class HeartbeatChannelHandler extends ChannelDuplexHandler {

    private static final Logger logger = LoggerFactory.getLogger(HeartbeatChannelHandler.class);
    public static final HeartbeatChannelHandler INSTANCE = new HeartbeatChannelHandler();

    private HeartbeatChannelHandler() {
    }

    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        if (ctx.channel().isActive() && ctx.channel().isRegistered()) {
            ctx.channel().attr(ChannelAttrKeys.lastReadTimeMillis).set(System.currentTimeMillis());
        }
    }

    @Override
    public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
        if (ctx.channel().isActive()) {
            ctx.channel().attr(ChannelAttrKeys.lastReadTimeMillis).set(System.currentTimeMillis());
        }
        ctx.fireChannelRegistered();
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        ctx.channel().attr(ChannelAttrKeys.lastReadTimeMillis).set(System.currentTimeMillis());
        ctx.fireChannelActive();
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
        ctx.channel().attr(ChannelAttrKeys.lastReadTimeMillis).set(System.currentTimeMillis());
        ctx.fireChannelReadComplete();
    }

    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
        if (evt instanceof IdleStateEvent) {
            int maxIdleTimeout = ctx.channel().attr(ChannelAttrKeys.maxIdleTimeout).get();
            long expireTime = System.currentTimeMillis()
                    - ctx.channel().attr(ChannelAttrKeys.lastReadTimeMillis).get();
            if (expireTime >= maxIdleTimeout * 1000) {
                logger.warn(
                        "readIdleTimeout exceed maxIdleTimeout, real timeout {}, this channel[{}] will be closed",
                        expireTime, ctx.channel().toString());
                ChannelUtil.closeChannel(ctx.channel());
            } else if (ChannelUtil.clientSide(ctx)) {
                // send heart beat to remote peer
                ctx.writeAndFlush(RequestProtocol.newHeartbeat());
            }
        } else {
            ctx.fireUserEventTriggered(evt);
        }
    }
}