org.spigotmc.WatchdogThread Maven / Gradle / Ivy

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package org.spigotmc;

import net.minecraft.server.MinecraftServer;
import org.bukkit.Bukkit;

import java.lang.management.ManagementFactory;
import java.lang.management.MonitorInfo;
import java.lang.management.ThreadInfo;
import java.util.logging.Level;
import java.util.logging.Logger;

public class WatchdogThread extends Thread {

  private static WatchdogThread instance;
  private final long timeoutTime;
  private final boolean restart;
  private volatile long lastTick;
  private volatile boolean stopping;

  private WatchdogThread(long timeoutTime, boolean restart) {
    super("Spigot Watchdog Thread");
    this.timeoutTime = timeoutTime;
    this.restart = restart;
  }

  public static void doStart(int timeoutTime, boolean restart) {
    if (instance == null) {
      instance = new WatchdogThread(timeoutTime * 1000L, restart);
      instance.start();
    }
  }

  public static void tick() {
    instance.lastTick = System.currentTimeMillis();
  }

  public static void doStop() {
    if (instance != null) {
      instance.stopping = true;
    }
  }

  private static void dumpThread(ThreadInfo thread, Logger log) {
    log.log(Level.SEVERE, "------------------------------");
    //
    log.log(Level.SEVERE, "Current Thread: " + thread.getThreadName());
    log.log(Level.SEVERE, "\tPID: " + thread.getThreadId()
      + " | Suspended: " + thread.isSuspended()
      + " | Native: " + thread.isInNative()
      + " | State: " + thread.getThreadState());
    if (thread.getLockedMonitors().length != 0) {
      log.log(Level.SEVERE, "\tThread is waiting on monitor(s):");
      for (MonitorInfo monitor : thread.getLockedMonitors()) {
        log.log(Level.SEVERE, "\t\tLocked on:" + monitor.getLockedStackFrame());
      }
    }
    log.log(Level.SEVERE, "\tStack:");
    //
    for (StackTraceElement stack : thread.getStackTrace()) {
      log.log(Level.SEVERE, "\t\t" + stack);
    }
  }

  @Override
  public void run() {
    while (!stopping) {
      //
      if (lastTick != 0 && System.currentTimeMillis() > lastTick + timeoutTime) {
        Logger log = Bukkit.getServer().getLogger();
        log.log(Level.SEVERE, "The server has stopped responding!");
        log.log(Level.SEVERE, "Please report this to http://www.spigotmc.org/");
        log.log(Level.SEVERE, "Be sure to include ALL relevant console errors and Minecraft crash reports");
        log.log(Level.SEVERE, "Spigot version: " + Bukkit.getServer().getVersion());
        //
        if (net.minecraft.server.World.haveWeSilencedAPhysicsCrash) {
          log.log(Level.SEVERE, "------------------------------");
          log.log(Level.SEVERE, "During the run of the server, a physics stackoverflow was supressed");
          log.log(Level.SEVERE, "near " + net.minecraft.server.World.blockLocation);
        }
        //
        log.log(Level.SEVERE, "------------------------------");
        log.log(Level.SEVERE, "Server thread dump (Look for plugins here before reporting to Spigot!):");
        dumpThread(ManagementFactory.getThreadMXBean().getThreadInfo(MinecraftServer.getServer().primaryThread.getId(), Integer.MAX_VALUE), log);
        log.log(Level.SEVERE, "------------------------------");
        //
        log.log(Level.SEVERE, "Entire Thread Dump:");
        ThreadInfo[] threads = ManagementFactory.getThreadMXBean().dumpAllThreads(true, true);
        for (ThreadInfo thread : threads) {
          dumpThread(thread, log);
        }
        log.log(Level.SEVERE, "------------------------------");

        if (restart) {
          RestartCommand.restart();
        }
        break;
      }

      try {
        sleep(10000);
      } catch (InterruptedException ex) {
        interrupt();
      }
    }
  }
}