move validateGreaterThanOrEqual

Author: ikhoon

core/src/main/java/com/linecorp/armeria/server/DefaultServerConfig.java

@@ -360,14 +360,6 @@ static Duration validateNonNegative(Duration duration, String fieldName) {
         return duration;
     }
 
-    static void validateGreaterThanOrEqual(Duration larger, String largerFieldName,
-                                           Duration smaller, String smallerFieldName) {
-        if (larger.compareTo(smaller) < 0) {
-            throw new IllegalArgumentException(largerFieldName + " must be greater than or equal to " +
-                                               smallerFieldName);
-        }
-    }
-
     @Override
     public Server server() {
         if (server == null) {

core/src/main/java/com/linecorp/armeria/server/GracefulShutdownBuilder.java

@@ -16,7 +16,6 @@
 
 package com.linecorp.armeria.server;
 
-import static com.linecorp.armeria.server.DefaultServerConfig.validateGreaterThanOrEqual;
 import static com.linecorp.armeria.server.DefaultServerConfig.validateNonNegative;
 import static java.util.Objects.requireNonNull;
 
@@ -107,6 +106,14 @@ public GracefulShutdownBuilder toExceptionFunction(
         return this;
     }
 
+    private static void validateGreaterThanOrEqual(Duration larger, String largerFieldName,
+                                           Duration smaller, String smallerFieldName) {
+        if (larger.compareTo(smaller) < 0) {
+            throw new IllegalArgumentException(largerFieldName + " must be greater than or equal to " +
+                                               smallerFieldName);
+        }
+    }
+
     /**
      * Builds a new {@link GracefulShutdown} with the configured parameters.
      */