add jukebox feature

core/src/main/java/de/bstly/we/businesslogic/SystemPropertyManager.java

@@ -42,12 +42,13 @@ public class SystemPropertyManager {
 	/**
 	 * Gets the.
 	 *
-	 * @param key the key
+	 * @param key          the key
 	 * @param defaultValue the default value
 	 * @return the string
 	 */
 	public String get(String key, String defaultValue) {
-		return systemPropertyRepository.findById(key).orElse(new SystemProperty(key, defaultValue)).getValue();
+		return systemPropertyRepository.findById(key).orElse(new SystemProperty(key, defaultValue))
+				.getValue();
 	}
 
 	/**
@@ -63,7 +64,7 @@ public class SystemPropertyManager {
 	/**
 	 * Gets the boolean.
 	 *
-	 * @param key the key
+	 * @param key          the key
 	 * @param defaultValue the default value
 	 * @return the boolean
 	 */
@@ -84,7 +85,7 @@ public class SystemPropertyManager {
 	/**
 	 * Gets the integer.
 	 *
-	 * @param key the key
+	 * @param key          the key
 	 * @param defaultValue the default value
 	 * @return the integer
 	 */
@@ -105,7 +106,7 @@ public class SystemPropertyManager {
 	/**
 	 * Gets the long.
 	 *
-	 * @param key the key
+	 * @param key          the key
 	 * @param defaultValue the default value
 	 * @return the long
 	 */
@@ -116,7 +117,7 @@ public class SystemPropertyManager {
 	/**
 	 * Adds the.
 	 *
-	 * @param key the key
+	 * @param key   the key
 	 * @param value the value
 	 */
 	public void add(String key, String value) {
@@ -128,7 +129,7 @@ public class SystemPropertyManager {
 	/**
 	 * Update.
 	 *
-	 * @param key the key
+	 * @param key   the key
 	 * @param value the value
 	 */
 	public void update(String key, String value) {
@@ -139,4 +140,12 @@ public class SystemPropertyManager {
 		systemPropertyRepository.save(systemProperty);
 	}
 
+	public void set(String key, String value) {
+		if (systemPropertyRepository.existsById(key)) {
+			update(key, value);
+		} else {
+			add(key, value);
+		}
+	}
+
 }