Change the prison TPS monitor to a singleton.

Will be using this in the near future to monitor system loads.

docs/changelog_v3.3.x.md

@@ -14,7 +14,11 @@
 These change logs represent the work that has been going on within prison. 
 
 
-# 3.3.0-alpha.18d 2024-09-06
+# 3.3.0-alpha.18d 2024-09-07
+
+
+* **Change the prison TPS monitor to a singleton.**
+Will be using this in the near future to monitor system loads.
 
 
 * **Mines: Minor change: Simplify how the command is ran so there is one exit point instead of two.**

prison-core/src/main/java/tech/mcprison/prison/util/PrisonTPS.java → prison-core/src/main/java/tech/mcprison/prison/util/PrisonTPSSingleton.java

@@ -158,9 +158,11 @@
  * </p> 
  *
  */
-public class PrisonTPS
+public class PrisonTPSSingleton
 		implements PrisonRunnable {
 
+	private static PrisonTPSSingleton instance;
+
 	/**
 	 * Note: Normally the task would have to run each tick, but by specifying the
 	 * SUBMIT_TICKS_INTERVAL it can skip a number of ticks to reduce the 
@@ -206,6 +208,23 @@ public class PrisonTPS
 	public static final Object tpsLock = new Object();
 
 
+	private PrisonTPSSingleton() {
+		super();
+	}
+
+
+	public static PrisonTPSSingleton getInstance() {
+		if ( instance == null ) {
+			synchronized ( PrisonTPSSingleton.class ) {
+				if ( instance == null ) {
+					instance = new PrisonTPSSingleton();
+				}
+			}
+		}
+		return instance;
+	}
+
+
 	// When submitted, taskId identifies the job.  A value of -1 indicates the job
 	// failed to be submitted, or is not valid.
 	private int taskId = -1;