src/main/java/moe/ymc/acron/mixin/MinecraftServerMixin.java


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package moe.ymc.acron.mixin;

import moe.ymc.acron.s2c.EventQueue;
import moe.ymc.acron.s2c.event.EventLagging;
import net.minecraft.server.MinecraftServer;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.spongepowered.asm.mixin.Mixin;
import org.spongepowered.asm.mixin.injection.At;
import org.spongepowered.asm.mixin.injection.Redirect;

@Mixin(MinecraftServer.class)
public class MinecraftServerMixin {
    private static final Logger AC_LOGGER = LogManager.getLogger();

    @Redirect(method = "runServer()V",
            remap = false,
            at = @At(value = "INVOKE",
                    target = "Lorg/apache/logging/log4j/Logger;warn(Ljava/lang/String;Ljava/lang/Object;Ljava/lang/Object;)V"))
    private void startServer(Logger instance, String s, Object o1, Object o2) {
        instance.warn(s, o1, o2);
        if (s.equals("Can't keep up! " +
                "Is the server overloaded? " +
                "Running {}ms or {} ticks behind") &&
        o1 instanceof Long &&
        o2 instanceof Long) {
            AC_LOGGER.debug("Lag: {}ms, {} ticks",
                    o1,
                    o2);
            EventQueue.enqueue(new EventLagging((long) o1, (long) o2));
        }
    }
}