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DeadLockDetector.java
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DeadLockDetector.java
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package me.nallar.tickthreading.minecraft;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.Map;
import java.util.TreeMap;
import cpw.mods.fml.common.ITickHandler;
import cpw.mods.fml.common.TickType;
import cpw.mods.fml.common.registry.TickRegistry;
import cpw.mods.fml.relauncher.Side;
import me.nallar.tickthreading.Log;
import net.minecraft.server.MinecraftServer;
import net.minecraft.world.World;
import net.minecraftforge.event.world.WorldEvent;
public class DeadLockDetector {
private static volatile String lastJob = "";
private static volatile long lastTickTime = 0;
private final Map<World, TickManager> managerMap;
private static final ITickHandler tickHandler = new ITickHandler() {
private final EnumSet<TickType> tickTypes = EnumSet.of(TickType.SERVER, TickType.CLIENTGUI);
@Override
public void tickStart(EnumSet<TickType> type, Object... tickData) {
tick("Server tick start");
}
@Override
public void tickEnd(EnumSet<TickType> type, Object... tickData) {
}
@Override
public EnumSet<TickType> ticks() {
return tickTypes;
}
@Override
public String getLabel() {
return "TickThreading Deadlock Detector";
}
};
public DeadLockDetector(Map<World, TickManager> managerMap) {
this.managerMap = managerMap;
Thread deadlockThread = new Thread(new Runnable() {
@Override
public void run() {
while (checkForDeadlocks()) {
try {
Thread.sleep(4000);
} catch (InterruptedException ignored) {
}
}
}
});
deadlockThread.setDaemon(true);
deadlockThread.setName("Deadlock Detector");
deadlockThread.start();
TickRegistry.registerTickHandler(tickHandler, Side.SERVER);
TickRegistry.registerTickHandler(tickHandler, Side.CLIENT);
}
public static synchronized long tick(String name) {
lastJob = name;
return lastTickTime = System.currentTimeMillis();
}
public boolean checkForDeadlocks() {
if (lastTickTime == 0) {
return true;
}
int deadTime = (int) (System.currentTimeMillis() - lastTickTime);
if (deadTime > 30000 && MinecraftServer.getServer().isServerRunning()) {
TreeMap<String, Thread> sortedThreads = new TreeMap<String, Thread>();
StringBuilder sb = new StringBuilder();
sb.append("The server appears to have deadlocked.")
.append("\nLast tick ").append(deadTime).append("ms ago.")
.append("\nTicking: ").append(lastJob).append('\n');
Map<Thread, StackTraceElement[]> traces = Thread.getAllStackTraces();
for (Thread thread : traces.keySet()) {
sortedThreads.put(thread.getName(), thread);
}
for (Thread thread : sortedThreads.values()) {
sb.append("Current Thread: ").append(thread.getName()).append('\n').append(" PID: ").append(thread.getId())
.append(" | Alive: ").append(thread.isAlive()).append(" | State: ").append(thread.getState())
.append(" Stack:").append('\n');
for (StackTraceElement stackTraceElement : thread.getStackTrace()) {
sb.append(" ").append(stackTraceElement.toString()).append('\n');
}
}
Log.severe(sb.toString());
for (World world : new HashMap<World, TickManager>(managerMap).keySet()) {
TickThreading.instance.onWorldUnload(new WorldEvent.Unload(world));
}
Log.flush();
if (TickThreading.instance.exitOnDeadlock) {
MinecraftServer.getServer().save();
System.exit(1);
}
return false;
}
return true;
}
}