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Redis Java client with features of In-Memory Data Grid
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/**
 * Copyright (c) 2013-2019 Nikita Koksharov
 *
 * 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 org.redisson.client.handler;

import java.util.concurrent.TimeUnit;

import org.redisson.api.RFuture;
import org.redisson.client.RedisClientConfig;
import org.redisson.client.RedisConnection;
import org.redisson.client.codec.StringCodec;
import org.redisson.client.protocol.CommandData;
import org.redisson.client.protocol.RedisCommands;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.Timeout;
import io.netty.util.TimerTask;

/**
 * 
 * @author Nikita Koksharov
 *
 */
@Sharable
public class PingConnectionHandler extends ChannelInboundHandlerAdapter {

    private static final Logger log = LoggerFactory.getLogger(PingConnectionHandler.class);
    
    private final RedisClientConfig config;

    public PingConnectionHandler(RedisClientConfig config) {
        this.config = config;
    }

    @Override
    public void channelActive(final ChannelHandlerContext ctx) throws Exception {
        RedisConnection connection = RedisConnection.getFrom(ctx.channel());
        connection.getConnectionPromise().onComplete((res, e) -> {
            if (e == null) {
                sendPing(ctx);
            }
        });
        ctx.fireChannelActive();
    }

    protected void sendPing(final ChannelHandlerContext ctx) {
        final RedisConnection connection = RedisConnection.getFrom(ctx.channel());
        final RFuture future = connection.async(StringCodec.INSTANCE, RedisCommands.PING);
        
        config.getTimer().newTimeout(new TimerTask() {
            @Override
            public void run(Timeout timeout) throws Exception {
                CommandData commandData = connection.getCurrentCommand();
                if ((commandData == null || !commandData.isBlockingCommand()) 
                        && (future.cancel(false) || !future.isSuccess())) {
                    ctx.channel().close();
                    log.debug("channel: {} closed due to PING response timeout set in {} ms", ctx.channel(), config.getPingConnectionInterval());
                } else {
                    sendPing(ctx);
                }
            }
        }, config.getPingConnectionInterval(), TimeUnit.MILLISECONDS);
    }


}