Added exception class

ALso added `getQueues()` function

source/tristanable/exceptions.d

@@ -0,0 +1,29 @@
+module tristanable.exceptions;
+
+import tristanable.manager;
+import tristanable.queue : Queue;
+
+public final class TristanableException : Exception
+{
+    this(Manager manager, string message)
+    {
+        super(generateMessage(message));
+    }
+
+    private string generateMessage(string errMesg)
+    {
+        string msg;
+
+        // msg = "TRistanable failure: "~errMesg~"\n\n";
+        // msg ~= "Queue stats:\n\n"
+
+        // Queue[] queues = manager.getQueues();
+        // foreach(Queue queue; queues)
+        // {
+        //     msg ~= "Queue["~to!(string)(queue.getTag())~"]: "~
+        // }
+        //  msg ~= manager.getQueues()
+
+        return msg;
+    }
+}

source/tristanable/manager.d

@@ -110,6 +110,21 @@ public final class Manager
 		return newQueue;
 	}
 
+	public Queue[] getQueues()
+	{
+		Queue[] queues;
+		queuesLock.lock();
+
+		foreach(Queue queue; this.queues)
+		{
+			queues ~= queue;
+		}
+
+		queuesLock.unlock();
+
+		return queues;
+	}
+
 	public void removeQueue(Queue queue)
 	{
 		queuesLock.lock();