minor refactoring

kafka-ui-api/src/main/java/com/provectus/kafka/ui/emitter/MessageFilters.java

@@ -39,13 +39,14 @@ public class MessageFilters {
   }
 
   static Predicate<TopicMessageDTO> groovyScriptFilter(String script) {
-    var compiledScript = compileScript(script);
+    var engine = getGroovyEngine();
+    var compiledScript = compileScript(engine, script);
     var jsonSlurper = new JsonSlurper();
     return new Predicate<TopicMessageDTO>() {
       @SneakyThrows
       @Override
       public boolean test(TopicMessageDTO msg) {
-        var bindings = getGroovyEngine().createBindings();
+        var bindings = engine.createBindings();
         bindings.put("partition", msg.getPartition());
         bindings.put("offset", msg.getOffset());
         bindings.put("timestampMs", msg.getTimestamp().toInstant().toEpochMilli());
@@ -59,7 +60,7 @@ public class MessageFilters {
           return (Boolean) result;
         } else {
           throw new ValidationException(
-              String.format("Unexpected script result: %s, Boolean should be returned instead", result));
+              "Unexpected script result: %s, Boolean should be returned instead".formatted(result));
         }
       }
     };
@@ -86,9 +87,9 @@ public class MessageFilters {
     return GROOVY_ENGINE;
   }
 
-  private static CompiledScript compileScript(String script) {
+  private static CompiledScript compileScript(GroovyScriptEngineImpl engine, String script) {
     try {
-      return getGroovyEngine().compile(script);
+      return engine.compile(script);
     } catch (ScriptException e) {
       throw new ValidationException("Script syntax error: " + e.getMessage());
     }