62 lines
2.3 KiB
Java
62 lines
2.3 KiB
Java
package io.github.ehlxr.did.server.sdk;
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import io.github.ehlxr.did.common.Constants;
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import io.github.ehlxr.did.common.NettyUtil;
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import io.github.ehlxr.did.common.SdkProto;
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import io.github.ehlxr.did.core.SnowFlake;
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import io.netty.channel.Channel;
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import io.netty.channel.ChannelFutureListener;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.SimpleChannelInboundHandler;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.util.concurrent.Semaphore;
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import java.util.concurrent.TimeUnit;
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/**
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* 通过雪花算法生成唯一 ID，写入 Channel 返回
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*
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* @author ehlxr
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*/
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public class SdkServerHandler extends SimpleChannelInboundHandler<SdkProto> {
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private static final Logger logger = LoggerFactory.getLogger(SdkServerHandler.class);
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/**
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* 通过信号量来控制流量
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*/
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private final Semaphore semaphore = new Semaphore(Constants.HANDLE_SDK_TPS);
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private final SnowFlake snowFlake;
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SdkServerHandler(SnowFlake snowFlake) {
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this.snowFlake = snowFlake;
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}
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@Override
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protected void channelRead0(ChannelHandlerContext ctx, SdkProto sdkProto) throws Exception {
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if (semaphore.tryAcquire(Constants.ACQUIRE_TIMEOUTMILLIS, TimeUnit.MILLISECONDS)) {
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try {
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sdkProto.setDid(snowFlake.nextId());
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ctx.channel().writeAndFlush(sdkProto).addListener((ChannelFutureListener) channelFuture -> semaphore.release());
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} catch (Exception e) {
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semaphore.release();
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logger.error("SdkServerhandler error", e);
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}
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} else {
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sdkProto.setDid(-1);
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ctx.channel().writeAndFlush(sdkProto);
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String info = String.format("SdkServerHandler tryAcquire semaphore timeout, %dms, waiting thread " + "nums: %d availablePermit: %d",
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Constants.ACQUIRE_TIMEOUTMILLIS, this.semaphore.getQueueLength(), this.semaphore.availablePermits());
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logger.warn(info);
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throw new Exception(info);
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}
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
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Channel channel = ctx.channel();
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logger.error("SdkServerHandler channel [{}] error and will be closed", NettyUtil.parseRemoteAddr(channel), cause);
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NettyUtil.closeChannel(channel);
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}
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}
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