package com.zy.acs.gateway.handler;

import com.zy.acs.framework.common.Cools;
import com.zy.acs.gateway.AbstractInboundHandler;
import com.zy.acs.gateway.cache.ChannelCache;
import com.zy.acs.gateway.domain.AgvPackage;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.timeout.IdleState;
import io.netty.handler.timeout.IdleStateEvent;
import io.netty.util.ReferenceCountUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

/**
 * 通道维护handler
 * Created by vincent on 2019-04-11
 */
@Component("protectorHandler")
@ChannelHandler.Sharable
public class ProtectorHandler extends AbstractInboundHandler<AgvPackage> {

    private static final Logger log = LoggerFactory.getLogger(ProtectorHandler.class);

    @Override
    protected boolean channelRead0(ChannelHandlerContext ctx, AgvPackage pac) throws Exception {
        // jvm堆外内存需要手动释放
        ReferenceCountUtil.release(pac.getSourceBuff());
        return true;
    }

    /**
     * 断开连接
     */
    @Override
    public void channelInactive(ChannelHandlerContext ctx) {
        String uniqueno = ChannelCache.removeChannel(ctx.channel());
        ctx.close();
        if (!Cools.isEmpty(uniqueno)){
            log.info("Agv [{}] 失去连接", uniqueno);
        }
    }

    /**
     * 管道异常
     */
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        log.error("ProtectorHandler exceptionCaught", cause);
        if (cause instanceof IndexOutOfBoundsException) {
            log.error("Received malformed data, waiting for more input......");
        } else {
            ChannelCache.removeChannel(ctx.channel());
            ctx.close();
        }
    }

    /**
     * 空闲剔除
     */
    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) {
        if (evt instanceof IdleStateEvent) {
            IdleStateEvent e = (IdleStateEvent) evt;
            if (IdleState.READER_IDLE == e.state()) {
                String uniqueno = ChannelCache.removeChannel(ctx.channel());
                ctx.close();
                if (!Cools.isEmpty(uniqueno)){
                    log.info("Agv [{}] 空闲剔除", uniqueno);
                }
            }
        }
    }

}