Add off-by-default feature to automatically thread dump every 60 seconds

Author: embeddedt

common/src/main/java/org/embeddedt/modernfix/ModernFix.java

@@ -11,6 +11,7 @@
 import org.embeddedt.modernfix.platform.ModernFixPlatformHooks;
 import org.embeddedt.modernfix.resources.ReloadExecutor;
 import org.embeddedt.modernfix.util.ClassInfoManager;
+import org.embeddedt.modernfix.world.IntegratedWatchdog;
 
 import java.lang.management.ManagementFactory;
 import java.util.concurrent.Executor;
@@ -46,6 +47,19 @@ public static Executor resourceReloadExecutor() {
     public ModernFix() {
         INSTANCE = this;
         ModernFixPlatformHooks.onServerCommandRegister(ModernFixCommands::register);
+        if(ModernFixMixinPlugin.instance.isOptionEnabled("feature.spam_thread_dump.ThreadDumper")) {
+            Thread t = new Thread() {
+                public void run() {
+                    while(true) {
+                        LOGGER.error("------ DEBUG THREAD DUMP (occurs every 60 seconds) ------");
+                        LOGGER.error(IntegratedWatchdog.obtainThreadDump());
+                        try { Thread.sleep(60000); } catch(InterruptedException e) {}
+                    }
+                }
+            };
+            t.setDaemon(true);
+            t.start();
+        }
     }
 
     public void onServerStarted() {

common/src/main/java/org/embeddedt/modernfix/core/config/ModernFixEarlyConfig.java

@@ -147,6 +147,7 @@ else if(isClientOnly && !ModernFixPlatformHooks.isClient())
             .put("mixin.perf.deduplicate_location", false)
             .put("mixin.feature.integrated_server_watchdog", true)
             .put("mixin.perf.faster_item_rendering", false)
+            .put("mixin.feature.spam_thread_dump", false)
             .put("mixin.perf.blast_search_trees", shouldReplaceSearchTrees)
             .put("mixin.devenv", isDevEnv)
             .put("mixin.perf.remove_spawn_chunks", isDevEnv)

common/src/main/java/org/embeddedt/modernfix/world/IntegratedWatchdog.java

@@ -25,6 +25,27 @@ public IntegratedWatchdog(MinecraftServer server) {
         this.setName("ModernFix integrated server watchdog");
     }
 
+    public static String obtainThreadDump() {
+        ThreadMXBean threadmxbean = ManagementFactory.getThreadMXBean();
+        ThreadInfo[] athreadinfo = threadmxbean.dumpAllThreads(true, true);
+        StringBuilder sb = new StringBuilder();
+        sb.append("Thread Dump:\n");
+        for(ThreadInfo threadinfo : athreadinfo) {
+            sb.append(threadinfo);
+            StackTraceElement[] elements = threadinfo.getStackTrace();
+            if(elements.length > 8) {
+                sb.append("extended trace:\n");
+                for(int i = 8; i < elements.length; i++) {
+                    sb.append("\tat ");
+                    sb.append(elements[i]);
+                    sb.append('\n');
+                }
+            }
+            sb.append('\n');
+        }
+        return sb.toString();
+    }
+
     public void run() {
         while(true) {
             MinecraftServer server = this.server.get();
@@ -35,24 +56,7 @@ public void run() {
             long delta = curTime - nextTick;
             if(delta > MAX_TICK_DELTA) {
                 LOGGER.error("A single server tick has taken {}, more than {} milliseconds", delta, MAX_TICK_DELTA);
-                ThreadMXBean threadmxbean = ManagementFactory.getThreadMXBean();
-                ThreadInfo[] athreadinfo = threadmxbean.dumpAllThreads(true, true);
-                StringBuilder sb = new StringBuilder();
-                sb.append("Thread Dump:\n");
-                for(ThreadInfo threadinfo : athreadinfo) {
-                    sb.append(threadinfo);
-                    StackTraceElement[] elements = threadinfo.getStackTrace();
-                    if(elements.length > 8) {
-                        sb.append("extended trace:\n");
-                        for(int i = 8; i < elements.length; i++) {
-                            sb.append("\tat ");
-                            sb.append(elements[i]);
-                            sb.append('\n');
-                        }
-                    }
-                    sb.append('\n');
-                }
-                LOGGER.error(sb);
+                LOGGER.error(obtainThreadDump());
                 nextTick = 0;
                 curTime = 0;
             }