Add Miscellaneous#measureExecutionTime method

base/src/main/java/de/staropensource/sosengine/base/Engine.java

@@ -60,8 +60,9 @@ public final class Engine {
      * @see LoggerInstance
      * @since 1-alpha0
      */
+    @SuppressWarnings("NotNullFieldNotInitialized")
     @NotNull
-    private final LoggerInstance logger;
+    private LoggerInstance logger;
 
     /**
      * Constructor, initializes the StarOpenSource Engine.
@@ -79,9 +80,7 @@ public final class Engine {
             return;
         }
 
-        // Startup time measurement
-        long initTime = System.currentTimeMillis();
-
+        long initTime = Miscellaneous.measureExecutionTime(() -> {
             // Initialize EngineConfiguration and load it
             new EngineConfiguration();
             EngineConfiguration.getInstance().loadConfiguration();
@@ -94,9 +93,7 @@ public final class Engine {
 
             // Initialize variables
             logger = new LoggerInstance(new LogIssuer(getClass(), CodePart.ENGINE));
-
-        // Startup time measurement
-        initTime = System.currentTimeMillis() - initTime;
+        });
 
         // Print finish message
         logger.info("Initialized sos!engine v%engine_version% in " + initTime + "ms");

base/src/main/java/de/staropensource/sosengine/base/utility/Miscellaneous.java

@@ -62,4 +62,17 @@ public final class Miscellaneous {
         object = null;
         while(weakReference.get() != null) System.gc();
     }
+
+    /**
+     * Measures the execution time of a {@link Runnable}.
+     *
+     * @param runnable the {@link Runnable} to execute
+     * @see Runnable
+     * @since 1-alpha0
+     */
+    public static long measureExecutionTime(Runnable runnable) {
+        long initTime = System.currentTimeMillis();
+        runnable.run();
+        return System.currentTimeMillis() - initTime;
+    }
 }