Add stack dump for threadFactory

src/main/java/com/seibel/lod/core/util/LodThreadFactory.java

@@ -19,8 +19,12 @@
 
 package com.seibel.lod.core.util;
 
+import java.lang.ref.WeakReference;
+import java.util.LinkedList;
 import java.util.concurrent.ThreadFactory;
 
+import com.seibel.lod.core.api.ClientApi;
+
 /**
  * Just a simple ThreadFactory to name ExecutorService
  * threads, which can be helpful when debugging.
@@ -32,6 +36,7 @@ public class LodThreadFactory implements ThreadFactory
 	public final String threadName;
 	public final int priority;
 	private int threadCount = 0;
+	private LinkedList<WeakReference<Thread>> threads = new LinkedList<WeakReference<Thread>>();
 	
 	
 	public LodThreadFactory(String newThreadName, int priority)
@@ -46,7 +51,34 @@ public class LodThreadFactory implements ThreadFactory
 	{
 		Thread t = new Thread(r, threadName + "[" + (threadCount++) + "]");
 		t.setPriority(priority);
+		threads.add(new WeakReference<Thread>(t));
 		return t;
 	}
 	
+	private static String StackTraceToString(StackTraceElement[] e) {
+		StringBuilder str = new StringBuilder();
+		str.append(e[0]);
+		str.append('\n');
+		for (int i = 1; i<e.length; i++) {
+			str.append("  at ");
+			str.append(e[i]);
+			str.append('\n');
+		}
+		return str.toString();
+	}
+	
+	public void dumpAllThreadStacks() {
+		for (WeakReference<Thread> tRef : threads) {
+			Thread t = tRef.get();
+			if (t != null) {
+				StackTraceElement[] stacks = t.getStackTrace();
+				if (stacks.length != 0) {
+					ClientApi.LOGGER.info("===========================================\n"
+							+ "Thread: "+t.getName()+"\n"+StackTraceToString(stacks));
+				}
+			}
+		}
+		threads.removeIf((weakRef) -> {return weakRef.get() == null;});
+	}
+	
 }