Startup Time Regression in EclipseLink fix - ASM Opcodes loading (#2065)

This is performance fix to avoid unnecessary loading of Opcodes constants from selected ASM provider. There was 4-6% Startup Time Regression in EclipseLink. Fixes #2048 Signed-off-by: Radek Felcman <radek.felcman@oracle.com> Co-authored-by: anija-anil <135797466+anija-anil@users.noreply.github.com>
eclipse-ee4j · Feb 20, 2024 · ef626d4 · ef626d4
1 parent 1f7906b
commit ef626d4
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Showing 34 changed files with 946 additions and 872 deletions.
diff --git a/...nce.dbws/src/main/java/org/eclipse/persistence/internal/dbws/SOAPResponseClassLoader.java b/...nce.dbws/src/main/java/org/eclipse/persistence/internal/dbws/SOAPResponseClassLoader.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998, 2023 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2024 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0 which is available at
@@ -58,12 +58,12 @@ protected byte[] generateClassBytes(String className) {
        *   }
        */
       ClassWriter cw = new EclipseLinkASMClassWriter();
-      cw.visit(Opcodes.valueInt("ACC_PUBLIC") + Opcodes.valueInt("ACC_SUPER"), className, null, SOAP_RESPONSE_CLASSNAME_SLASHES, null);
+      cw.visit(Opcodes.ACC_PUBLIC + Opcodes.ACC_SUPER, className, null, SOAP_RESPONSE_CLASSNAME_SLASHES, null);
 
-      MethodVisitor mv = cw.visitMethod(Opcodes.valueInt("ACC_PUBLIC"), "<init>", "()V", null, null);
-      mv.visitVarInsn(Opcodes.valueInt("ALOAD"), 0);
-      mv.visitMethodInsn(Opcodes.valueInt("INVOKESPECIAL"), SOAP_RESPONSE_CLASSNAME_SLASHES, "<init>", "()V", false);
-      mv.visitInsn(Opcodes.valueInt("RETURN"));
+      MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "<init>", "()V", null, null);
+      mv.visitVarInsn(Opcodes.ALOAD, 0);
+      mv.visitMethodInsn(Opcodes.INVOKESPECIAL, SOAP_RESPONSE_CLASSNAME_SLASHES, "<init>", "()V", false);
+      mv.visitInsn(Opcodes.RETURN);
       mv.visitMaxs(0, 0);
       mv.visitEnd();
 

diff --git a/...pse.persistence.dbws/src/main/java/org/eclipse/persistence/internal/xr/XRClassWriter.java b/...pse.persistence.dbws/src/main/java/org/eclipse/persistence/internal/xr/XRClassWriter.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998, 2023 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2024 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0 which is available at
@@ -67,44 +67,44 @@ public byte[] writeClass(DynamicClassLoader loader, String className) throws Cla
 
         // special-case: build sub-class of XRDynamicEntityCollection
         if (className.endsWith(COLLECTION_WRAPPER_SUFFIX)) {
-            cw.visit(Opcodes.valueInt("ACC_PUBLIC") + Opcodes.valueInt("ACC_SUPER"), classNameAsSlashes, null, XR_DYNAMIC_ENTITY_COLLECTION_CLASSNAME_SLASHES, null);
-            mv = cw.visitMethod(Opcodes.valueInt("ACC_PUBLIC"), INIT, "()V", null, null);
-            mv.visitVarInsn(Opcodes.valueInt("ALOAD"), 0);
-            mv.visitMethodInsn(Opcodes.valueInt("INVOKESPECIAL"), XR_DYNAMIC_ENTITY_COLLECTION_CLASSNAME_SLASHES, INIT, "()V", false);
-            mv.visitInsn(Opcodes.valueInt("RETURN"));
+            cw.visit(Opcodes.ACC_PUBLIC + Opcodes.ACC_SUPER, classNameAsSlashes, null, XR_DYNAMIC_ENTITY_COLLECTION_CLASSNAME_SLASHES, null);
+            mv = cw.visitMethod(Opcodes.ACC_PUBLIC, INIT, "()V", null, null);
+            mv.visitVarInsn(Opcodes.ALOAD, 0);
+            mv.visitMethodInsn(Opcodes.INVOKESPECIAL, XR_DYNAMIC_ENTITY_COLLECTION_CLASSNAME_SLASHES, INIT, "()V", false);
+            mv.visitInsn(Opcodes.RETURN);
             mv.visitMaxs(0, 0);
             mv.visitEnd();
         } else {
             // public class Foo extends XRDynamicEntity {
-            cw.visit(Opcodes.valueInt("ACC_PUBLIC") + Opcodes.valueInt("ACC_SUPER"), classNameAsSlashes, null, XR_DYNAMIC_ENTITY_CLASSNAME_SLASHES, null);
+            cw.visit(Opcodes.ACC_PUBLIC + Opcodes.ACC_SUPER, classNameAsSlashes, null, XR_DYNAMIC_ENTITY_CLASSNAME_SLASHES, null);
 
             // public static XRDynamicPropertiesManager DPM = new
             // XRDynamicPropertiesManager();
-            cw.visitField(Opcodes.valueInt("ACC_PUBLIC") + Opcodes.valueInt("ACC_STATIC"), PROPERTIES_MANAGER_FIELD, "L" + XR_DYNAMIC_PROPERTIES_MANAGER_CLASSNAME_SLASHES + ";", null, null);
-
-            mv = cw.visitMethod(Opcodes.valueInt("ACC_STATIC"), CLINIT, "()V", null, null);
-            mv.visitTypeInsn(Opcodes.valueInt("NEW"), XR_DYNAMIC_PROPERTIES_MANAGER_CLASSNAME_SLASHES);
-            mv.visitInsn(Opcodes.valueInt("DUP"));
-            mv.visitMethodInsn(Opcodes.valueInt("INVOKESPECIAL"), XR_DYNAMIC_PROPERTIES_MANAGER_CLASSNAME_SLASHES, INIT, "()V", false);
-            mv.visitFieldInsn(Opcodes.valueInt("PUTSTATIC"), classNameAsSlashes, PROPERTIES_MANAGER_FIELD, "L" + XR_DYNAMIC_PROPERTIES_MANAGER_CLASSNAME_SLASHES + ";");
-            mv.visitInsn(Opcodes.valueInt("RETURN"));
+            cw.visitField(Opcodes.ACC_PUBLIC + Opcodes.ACC_STATIC, PROPERTIES_MANAGER_FIELD, "L" + XR_DYNAMIC_PROPERTIES_MANAGER_CLASSNAME_SLASHES + ";", null, null);
+
+            mv = cw.visitMethod(Opcodes.ACC_STATIC, CLINIT, "()V", null, null);
+            mv.visitTypeInsn(Opcodes.NEW, XR_DYNAMIC_PROPERTIES_MANAGER_CLASSNAME_SLASHES);
+            mv.visitInsn(Opcodes.DUP);
+            mv.visitMethodInsn(Opcodes.INVOKESPECIAL, XR_DYNAMIC_PROPERTIES_MANAGER_CLASSNAME_SLASHES, INIT, "()V", false);
+            mv.visitFieldInsn(Opcodes.PUTSTATIC, classNameAsSlashes, PROPERTIES_MANAGER_FIELD, "L" + XR_DYNAMIC_PROPERTIES_MANAGER_CLASSNAME_SLASHES + ";");
+            mv.visitInsn(Opcodes.RETURN);
             mv.visitMaxs(0, 0);
             mv.visitEnd();
 
             // public Foo() {
             // super();
             // }
-            mv = cw.visitMethod(Opcodes.valueInt("ACC_PUBLIC"), INIT, "()V", null, null);
-            mv.visitVarInsn(Opcodes.valueInt("ALOAD"), 0);
-            mv.visitMethodInsn(Opcodes.valueInt("INVOKESPECIAL"), XR_DYNAMIC_ENTITY_CLASSNAME_SLASHES, INIT, "()V", false);
-            mv.visitInsn(Opcodes.valueInt("RETURN"));
+            mv = cw.visitMethod(Opcodes.ACC_PUBLIC, INIT, "()V", null, null);
+            mv.visitVarInsn(Opcodes.ALOAD, 0);
+            mv.visitMethodInsn(Opcodes.INVOKESPECIAL, XR_DYNAMIC_ENTITY_CLASSNAME_SLASHES, INIT, "()V", false);
+            mv.visitInsn(Opcodes.RETURN);
             mv.visitMaxs(0, 0);
             mv.visitEnd();
 
             // public XRDynamicPropertiesManager fetchPropertiesManager() {
-            mv = cw.visitMethod(Opcodes.valueInt("ACC_PUBLIC"), "fetchPropertiesManager", "()L" + XR_DYNAMIC_PROPERTIES_MANAGER_CLASSNAME_SLASHES + ";", null, null);
-            mv.visitFieldInsn(Opcodes.valueInt("GETSTATIC"), classNameAsSlashes, PROPERTIES_MANAGER_FIELD, "L" + XR_DYNAMIC_PROPERTIES_MANAGER_CLASSNAME_SLASHES + ";");
-            mv.visitInsn(Opcodes.valueInt("ARETURN"));
+            mv = cw.visitMethod(Opcodes.ACC_PUBLIC, "fetchPropertiesManager", "()L" + XR_DYNAMIC_PROPERTIES_MANAGER_CLASSNAME_SLASHES + ";", null, null);
+            mv.visitFieldInsn(Opcodes.GETSTATIC, classNameAsSlashes, PROPERTIES_MANAGER_FIELD, "L" + XR_DYNAMIC_PROPERTIES_MANAGER_CLASSNAME_SLASHES + ";");
+            mv.visitInsn(Opcodes.ARETURN);
             mv.visitMaxs(0, 0);
             mv.visitEnd();
         }

diff --git a/...re.test/src/test/java/org/eclipse/persistence/testing/tests/junit/asm/ASMFactoryTest.java b/...re.test/src/test/java/org/eclipse/persistence/testing/tests/junit/asm/ASMFactoryTest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2023 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2023, 2024 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0 which is available at
@@ -16,6 +16,7 @@
 
 import org.eclipse.persistence.asm.ASMFactory;
 import org.eclipse.persistence.asm.ClassVisitor;
+import org.eclipse.persistence.asm.Opcodes;
 import org.eclipse.persistence.config.SystemProperties;
 import org.junit.Test;
 
@@ -40,7 +41,7 @@ public void getAsmServiceTest() {
     @Test
     public void createClassVisitorTest() {
         String asmServiceSysProperty = System.getProperty(SystemProperties.ASM_SERVICE, "");
-        ClassVisitor classVisitor = ASMFactory.createClassVisitor(ASMFactory.ASM_API_SELECTED);
+        ClassVisitor classVisitor = ASMFactory.createClassVisitor(Opcodes.ASM_API_SELECTED);
         switch (asmServiceSysProperty) {
             case ASMFactory.ASM_SERVICE_OW2:
                 assertEquals(org.eclipse.persistence.asm.internal.platform.ow2.ClassVisitorImpl.class, classVisitor.getClass());

diff --git a/...on/org.eclipse.persistence.core/src/main/java/org/eclipse/persistence/asm/ASMFactory.java b/...on/org.eclipse.persistence.core/src/main/java/org/eclipse/persistence/asm/ASMFactory.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2023 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2023, 2024 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0 which is available at
@@ -14,6 +14,7 @@
 //     Oracle - initial API and implementation
 package org.eclipse.persistence.asm;
 
+import org.eclipse.persistence.asm.internal.Util;
 import org.eclipse.persistence.config.SystemProperties;
 import org.eclipse.persistence.exceptions.ValidationException;
 import org.eclipse.persistence.internal.security.PrivilegedAccessHelper;
@@ -26,23 +27,23 @@
 import java.security.AccessController;
 import java.security.PrivilegedAction;
 import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.regex.Pattern;
 
 public class ASMFactory {
 
-    private final static SessionLog LOG = AbstractSessionLog.getLog();
-
+    // This block must be first - begin
     public final static String ASM_SERVICE_ECLIPSELINK = "eclipselink";
     public final static String ASM_SERVICE_OW2 = "ow2";
     private final static String ASM_OW2_CLASS_VISITOR = "org.objectweb.asm.ClassVisitor";
     private final static String ASM_ECLIPSELINK_CLASS_VISITOR = "org.eclipse.persistence.internal.libraries.asm.ClassVisitor";
+    private final static SessionLog LOG = AbstractSessionLog.getLog();
+    // This block must be first - end
 
-    //Should be changed in case of ASM upgrade
-    public final static int ASM_API_SELECTED = Opcodes.valueInt("ASM9");
-    public final static int JAVA_CLASS_VERSION = Opcodes.valueInt("V1_8");
+    // Should be changed in case of ASM upgrade
     public final static int JAVA_CLASS_LATEST_VERSION = ASMFactory.getLatestOPCodeVersion();
 
     public static AnnotationVisitor createAnnotationVisitor(final int api) {

diff --git a/...n/org.eclipse.persistence.core/src/main/java/org/eclipse/persistence/asm/ClassReader.java b/...n/org.eclipse.persistence.core/src/main/java/org/eclipse/persistence/asm/ClassReader.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2023 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2023, 2024 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0 which is available at
@@ -21,6 +21,7 @@
 
 public abstract class ClassReader {
 
+    //This block must be first - begin
     private final static String ASM_CLASSREADER_ECLIPSELINK = "org.eclipse.persistence.internal.libraries.asm.ClassReader";
     private final static String ASM_CLASSREADER_OW2 = "org.objectweb.asm.ClassReader";
 
@@ -30,8 +31,13 @@ public abstract class ClassReader {
         ASM_CLASSREADER_MAP.put(ASMFactory.ASM_SERVICE_OW2, ASM_CLASSREADER_OW2);
         ASM_CLASSREADER_MAP.put(ASMFactory.ASM_SERVICE_ECLIPSELINK, ASM_CLASSREADER_ECLIPSELINK);
     }
+    //This block must be first - end
 
-    public static int valueInt(String fieldName) {
+    public static final int SKIP_CODE = valueInt("SKIP_CODE");
+    public static final int SKIP_DEBUG = valueInt("SKIP_DEBUG");
+    public static final int SKIP_FRAMES = valueInt("SKIP_FRAMES");
+
+    private static int valueInt(String fieldName) {
         return ((int) Util.getFieldValue(ASM_CLASSREADER_MAP, fieldName, Integer.TYPE));
     }
 

diff --git a/...n/org.eclipse.persistence.core/src/main/java/org/eclipse/persistence/asm/ClassWriter.java b/...n/org.eclipse.persistence.core/src/main/java/org/eclipse/persistence/asm/ClassWriter.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2023 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2023, 2024 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0 which is available at
@@ -21,6 +21,7 @@
 
 public abstract class ClassWriter extends ClassVisitor {
 
+    //This block must be first - begin
     private final static String ASM_CLASSWRITER_ECLIPSELINK = "org.eclipse.persistence.internal.libraries.asm.ClassWriter";
     private final static String ASM_CLASSWRITER_OW2 = "org.objectweb.asm.ClassWriter";
 
@@ -30,7 +31,9 @@ public abstract class ClassWriter extends ClassVisitor {
         ASM_CLASSWRITER_MAP.put(ASMFactory.ASM_SERVICE_OW2, ASM_CLASSWRITER_OW2);
         ASM_CLASSWRITER_MAP.put(ASMFactory.ASM_SERVICE_ECLIPSELINK, ASM_CLASSWRITER_ECLIPSELINK);
     }
+    //This block must be first - end
 
+    public static final int COMPUTE_FRAMES = valueInt("COMPUTE_FRAMES");
     private ClassWriter cw;
     protected ClassWriter customClassWriter;
 
@@ -42,7 +45,7 @@ public ClassWriter(final int flags) {
     }
 
     public ClassWriter(final ClassReader classReader, final int flags) {
-        super(ASMFactory.ASM_API_SELECTED);
+        super(Opcodes.ASM_API_SELECTED);
         cw = ASMFactory.createClassWriter(flags);
     }
 
@@ -58,7 +61,7 @@ public ClassWriter getInternal() {
         return cw;
     }
 
-    public static int valueInt(String fieldName) {
+    private static int valueInt(String fieldName) {
         return ((int) Util.getFieldValue(ASM_CLASSWRITER_MAP, fieldName, Integer.TYPE));
     }
 

diff --git a/...persistence.core/src/main/java/org/eclipse/persistence/asm/EclipseLinkASMClassWriter.java b/...persistence.core/src/main/java/org/eclipse/persistence/asm/EclipseLinkASMClassWriter.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2023 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2023, 2024 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0 which is available at
@@ -23,7 +23,7 @@ public class EclipseLinkASMClassWriter extends ClassWriter {
     private ClassWriter classWriter;
 
     public EclipseLinkASMClassWriter() {
-        this(ClassWriter.valueInt("COMPUTE_FRAMES"));
+        this(ClassWriter.COMPUTE_FRAMES);
     }
 
     public EclipseLinkASMClassWriter(final int flags) {

diff --git a/...sistence.core/src/main/java/org/eclipse/persistence/asm/EclipseLinkAnnotationVisitor.java b/...sistence.core/src/main/java/org/eclipse/persistence/asm/EclipseLinkAnnotationVisitor.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2023 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2023, 2024 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0 which is available at
@@ -19,11 +19,11 @@ public abstract class EclipseLinkAnnotationVisitor extends AnnotationVisitor {
     private AnnotationVisitor annotationVisitor;
 
     public EclipseLinkAnnotationVisitor() {
-        this.annotationVisitor = ASMFactory.createAnnotationVisitor(ASMFactory.ASM_API_SELECTED);
+        this.annotationVisitor = ASMFactory.createAnnotationVisitor(Opcodes.ASM_API_SELECTED);
     }
 
     public EclipseLinkAnnotationVisitor(AnnotationVisitor annotationVisitor) {
-        this.annotationVisitor = ASMFactory.createAnnotationVisitor(ASMFactory.ASM_API_SELECTED, annotationVisitor);
+        this.annotationVisitor = ASMFactory.createAnnotationVisitor(Opcodes.ASM_API_SELECTED, annotationVisitor);
     }
 
     @Override

diff --git a/...e.persistence.core/src/main/java/org/eclipse/persistence/asm/EclipseLinkClassVisitor.java b/...e.persistence.core/src/main/java/org/eclipse/persistence/asm/EclipseLinkClassVisitor.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2023 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2023, 2024 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0 which is available at
@@ -17,11 +17,11 @@
 public abstract class EclipseLinkClassVisitor extends ClassVisitor {
 
     public EclipseLinkClassVisitor() {
-        super(ASMFactory.ASM_API_SELECTED);
+        super(Opcodes.ASM_API_SELECTED);
     }
 
     public EclipseLinkClassVisitor(ClassVisitor classVisitor) {
-        super(ASMFactory.ASM_API_SELECTED, classVisitor);
+        super(Opcodes.ASM_API_SELECTED, classVisitor);
     }
 
     public void visit(
@@ -30,7 +30,7 @@ public void visit(
             final String signature,
             final String superName,
             final String[] interfaces) {
-        visit(ASMFactory.ASM_API_SELECTED, access, name, signature, superName, interfaces);
+        visit(Opcodes.ASM_API_SELECTED, access, name, signature, superName, interfaces);
     }
 
     public abstract AnnotationVisitor visitAnnotation(String desc, boolean visible);

diff --git a/...e.persistence.core/src/main/java/org/eclipse/persistence/asm/EclipseLinkFieldVisitor.java b/...e.persistence.core/src/main/java/org/eclipse/persistence/asm/EclipseLinkFieldVisitor.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2023 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2023, 2024 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0 which is available at
@@ -19,11 +19,11 @@ public class EclipseLinkFieldVisitor extends FieldVisitor {
     private FieldVisitor fieldVisitor;
 
     public EclipseLinkFieldVisitor() {
-        this.fieldVisitor = ASMFactory.createFieldVisitor(ASMFactory.ASM_API_SELECTED);
+        this.fieldVisitor = ASMFactory.createFieldVisitor(Opcodes.ASM_API_SELECTED);
     }
 
     public EclipseLinkFieldVisitor(FieldVisitor fieldVisitor) {
-        this.fieldVisitor = ASMFactory.createFieldVisitor(ASMFactory.ASM_API_SELECTED, fieldVisitor);
+        this.fieldVisitor = ASMFactory.createFieldVisitor(Opcodes.ASM_API_SELECTED, fieldVisitor);
     }
 
     @Override

diff --git a/....persistence.core/src/main/java/org/eclipse/persistence/asm/EclipseLinkMethodVisitor.java b/....persistence.core/src/main/java/org/eclipse/persistence/asm/EclipseLinkMethodVisitor.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2023 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2023, 2024 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0 which is available at
@@ -19,11 +19,11 @@ public class EclipseLinkMethodVisitor extends MethodVisitor {
     protected MethodVisitor methodVisitor;
 
     public EclipseLinkMethodVisitor() {
-        this.methodVisitor = ASMFactory.createMethodVisitor(ASMFactory.ASM_API_SELECTED);
+        this.methodVisitor = ASMFactory.createMethodVisitor(Opcodes.ASM_API_SELECTED);
     }
 
     public EclipseLinkMethodVisitor(MethodVisitor methodVisitor) {
-        this.methodVisitor = ASMFactory.createMethodVisitor(ASMFactory.ASM_API_SELECTED, methodVisitor);
+        this.methodVisitor = ASMFactory.createMethodVisitor(Opcodes.ASM_API_SELECTED, methodVisitor);
     }
 
     @Override