rename ClassHelper to ClassUtils, add MethodUtils (#3806)

* rename ClassHelper to ClassUtils, add MethodUtils
* remove import with '*'
* ClassUtils add apache license

Author: LiZhenNet

dubbo-common/src/main/java/org/apache/dubbo/common/Version.java

@@ -18,7 +18,7 @@
 
 import org.apache.dubbo.common.logger.Logger;
 import org.apache.dubbo.common.logger.LoggerFactory;
-import org.apache.dubbo.common.utils.ClassHelper;
+import org.apache.dubbo.common.utils.ClassUtils;
 import org.apache.dubbo.common.utils.StringUtils;
 
 import java.io.IOException;
@@ -240,7 +240,7 @@ public static void checkDuplicate(String path, boolean failOnError) {
      * search resources in caller's classloader
      */
     private static Set<String> getResources(String path) throws IOException {
-        Enumeration<URL> urls = ClassHelper.getCallerClassLoader(Version.class).getResources(path);
+        Enumeration<URL> urls = ClassUtils.getCallerClassLoader(Version.class).getResources(path);
         Set<String> files = new HashSet<String>();
         while (urls.hasMoreElements()) {
             URL url = urls.nextElement();

dubbo-common/src/main/java/org/apache/dubbo/common/bytecode/ClassGenerator.java

@@ -16,10 +16,6 @@
  */
 package org.apache.dubbo.common.bytecode;
 
-import org.apache.dubbo.common.utils.ArrayUtils;
-import org.apache.dubbo.common.utils.ClassHelper;
-import org.apache.dubbo.common.utils.ReflectUtils;
-
 import javassist.CannotCompileException;
 import javassist.ClassPool;
 import javassist.CtClass;
@@ -30,6 +26,9 @@
 import javassist.CtNewMethod;
 import javassist.LoaderClassPath;
 import javassist.NotFoundException;
+import org.apache.dubbo.common.utils.ArrayUtils;
+import org.apache.dubbo.common.utils.ClassUtils;
+import org.apache.dubbo.common.utils.ReflectUtils;
 import org.apache.dubbo.common.utils.StringUtils;
 
 import java.lang.reflect.Constructor;
@@ -285,7 +284,7 @@ public ClassPool getClassPool() {
     }
 
     public Class<?> toClass() {
-        return toClass(ClassHelper.getClassLoader(ClassGenerator.class),
+        return toClass(ClassUtils.getClassLoader(ClassGenerator.class),
                 getClass().getProtectionDomain());
     }
 

dubbo-common/src/main/java/org/apache/dubbo/common/bytecode/Mixin.java

@@ -16,7 +16,7 @@
  */
 package org.apache.dubbo.common.bytecode;
 
-import org.apache.dubbo.common.utils.ClassHelper;
+import org.apache.dubbo.common.utils.ClassUtils;
 import org.apache.dubbo.common.utils.ReflectUtils;
 
 import java.lang.reflect.Method;
@@ -69,7 +69,7 @@ public static Mixin mixin(Class<?>[] ics, Class<?> dc, ClassLoader cl) {
      * @return Mixin instance.
      */
     public static Mixin mixin(Class<?>[] ics, Class<?>[] dcs) {
-        return mixin(ics, dcs, ClassHelper.getCallerClassLoader(Mixin.class));
+        return mixin(ics, dcs, ClassUtils.getCallerClassLoader(Mixin.class));
     }
 
     /**

dubbo-common/src/main/java/org/apache/dubbo/common/bytecode/Proxy.java

@@ -17,7 +17,7 @@
 package org.apache.dubbo.common.bytecode;
 
 import org.apache.dubbo.common.Constants;
-import org.apache.dubbo.common.utils.ClassHelper;
+import org.apache.dubbo.common.utils.ClassUtils;
 import org.apache.dubbo.common.utils.ReflectUtils;
 
 import java.lang.ref.Reference;
@@ -62,7 +62,7 @@ protected Proxy() {
      * @return Proxy instance.
      */
     public static Proxy getProxy(Class<?>... ics) {
-        return getProxy(ClassHelper.getClassLoader(Proxy.class), ics);
+        return getProxy(ClassUtils.getClassLoader(Proxy.class), ics);
     }
 
     /**

dubbo-common/src/main/java/org/apache/dubbo/common/bytecode/Wrapper.java

@@ -16,7 +16,7 @@
  */
 package org.apache.dubbo.common.bytecode;
 
-import org.apache.dubbo.common.utils.ClassHelper;
+import org.apache.dubbo.common.utils.ClassUtils;
 import org.apache.dubbo.common.utils.ReflectUtils;
 
 import java.lang.reflect.Field;
@@ -127,7 +127,7 @@ private static Wrapper makeWrapper(Class<?> c) {
         }
 
         String name = c.getName();
-        ClassLoader cl = ClassHelper.getClassLoader(c);
+        ClassLoader cl = ClassUtils.getClassLoader(c);
 
         StringBuilder c1 = new StringBuilder("public void setPropertyValue(Object o, String n, Object v){ ");
         StringBuilder c2 = new StringBuilder("public Object getPropertyValue(Object o, String n){ ");

dubbo-common/src/main/java/org/apache/dubbo/common/compiler/support/AbstractCompiler.java

@@ -17,7 +17,6 @@
 package org.apache.dubbo.common.compiler.support;
 
 import org.apache.dubbo.common.compiler.Compiler;
-import org.apache.dubbo.common.utils.ClassHelper;
 
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -50,7 +49,7 @@ public Class<?> compile(String code, ClassLoader classLoader) {
         }
         String className = pkg != null && pkg.length() > 0 ? pkg + "." + cls : cls;
         try {
-            return Class.forName(className, true, ClassHelper.getCallerClassLoader(getClass()));
+            return Class.forName(className, true, org.apache.dubbo.common.utils.ClassUtils.getCallerClassLoader(getClass()));
         } catch (ClassNotFoundException e) {
             if (!code.endsWith("}")) {
                 throw new IllegalStateException("The java code not endsWith \"}\", code: \n" + code + "\n");

dubbo-common/src/main/java/org/apache/dubbo/common/compiler/support/JavassistCompiler.java

@@ -16,7 +16,6 @@
  */
 package org.apache.dubbo.common.compiler.support;
 
-import org.apache.dubbo.common.utils.ClassHelper;
 
 import javassist.CtClass;
 
@@ -49,25 +48,25 @@ public Class<?> doCompile(String name, String source) throws Throwable {
         while (matcher.find()) {
             builder.addImports(matcher.group(1).trim());
         }
-        
+
         // process extended super class
         matcher = EXTENDS_PATTERN.matcher(source);
         if (matcher.find()) {
             builder.setSuperClassName(matcher.group(1).trim());
         }
-        
+
         // process implemented interfaces
         matcher = IMPLEMENTS_PATTERN.matcher(source);
         if (matcher.find()) {
             String[] ifaces = matcher.group(1).trim().split("\\,");
             Arrays.stream(ifaces).forEach(i -> builder.addInterface(i.trim()));
         }
-        
+
         // process constructors, fields, methods
         String body = source.substring(source.indexOf('{') + 1, source.length() - 1);
         String[] methods = METHODS_PATTERN.split(body);
         String className = ClassUtils.getSimpleClassName(name);
-        Arrays.stream(methods).map(String::trim).filter(m -> !m.isEmpty()).forEach(method-> {
+        Arrays.stream(methods).map(String::trim).filter(m -> !m.isEmpty()).forEach(method -> {
             if (method.startsWith(className)) {
                 builder.addConstructor("public " + method);
             } else if (FIELD_PATTERN.matcher(method).matches()) {
@@ -76,9 +75,9 @@ public Class<?> doCompile(String name, String source) throws Throwable {
                 builder.addMethod("public " + method);
             }
         });
-        
+
         // compile
-        ClassLoader classLoader = ClassHelper.getCallerClassLoader(getClass());
+        ClassLoader classLoader = org.apache.dubbo.common.utils.ClassUtils.getCallerClassLoader(getClass());
         CtClass cls = builder.build(classLoader);
         return cls.toClass(classLoader, JavassistCompiler.class.getProtectionDomain());
     }

dubbo-common/src/main/java/org/apache/dubbo/common/compiler/support/JdkCompiler.java

@@ -16,7 +16,6 @@
  */
 package org.apache.dubbo.common.compiler.support;
 
-import org.apache.dubbo.common.utils.ClassHelper;
 
 import javax.tools.DiagnosticCollector;
 import javax.tools.FileObject;
@@ -261,7 +260,7 @@ protected Class<?> findClass(final String qualifiedClassName) throws ClassNotFou
                 return defineClass(qualifiedClassName, bytes, 0, bytes.length);
             }
             try {
-                return ClassHelper.forNameWithCallerClassLoader(qualifiedClassName, getClass());
+                return org.apache.dubbo.common.utils.ClassUtils.forNameWithCallerClassLoader(qualifiedClassName, getClass());
             } catch (ClassNotFoundException nf) {
                 return super.findClass(qualifiedClassName);
             }

dubbo-common/src/main/java/org/apache/dubbo/common/extension/ExtensionLoader.java

@@ -22,13 +22,14 @@
 import org.apache.dubbo.common.logger.Logger;
 import org.apache.dubbo.common.logger.LoggerFactory;
 import org.apache.dubbo.common.utils.ArrayUtils;
-import org.apache.dubbo.common.utils.ClassHelper;
+import org.apache.dubbo.common.utils.ClassUtils;
+import org.apache.dubbo.common.utils.CollectionUtils;
 import org.apache.dubbo.common.utils.ConcurrentHashSet;
 import org.apache.dubbo.common.utils.ConfigUtils;
 import org.apache.dubbo.common.utils.Holder;
 import org.apache.dubbo.common.utils.ReflectUtils;
 import org.apache.dubbo.common.utils.StringUtils;
-import org.apache.dubbo.common.utils.CollectionUtils;
+
 import java.io.BufferedReader;
 import java.io.InputStreamReader;
 import java.lang.reflect.Method;
@@ -142,7 +143,7 @@ public static void resetExtensionLoader(Class type) {
     }
 
     private static ClassLoader findClassLoader() {
-        return ClassHelper.getClassLoader(ExtensionLoader.class);
+        return ClassUtils.getClassLoader(ExtensionLoader.class);
     }
 
     public String getExtensionName(T extensionInstance) {

dubbo-common/src/main/java/org/apache/dubbo/common/timer/HashedWheelTimer.java

@@ -18,7 +18,7 @@
 
 import org.apache.dubbo.common.logger.Logger;
 import org.apache.dubbo.common.logger.LoggerFactory;
-import org.apache.dubbo.common.utils.ClassHelper;
+import org.apache.dubbo.common.utils.ClassUtils;
 
 import java.util.Collections;
 import java.util.HashSet;
@@ -415,7 +415,7 @@ public long pendingTimeouts() {
     }
 
     private static void reportTooManyInstances() {
-        String resourceType = ClassHelper.simpleClassName(HashedWheelTimer.class);
+        String resourceType = ClassUtils.simpleClassName(HashedWheelTimer.class);
         logger.error("You are creating too many " + resourceType + " instances. " +
                 resourceType + " is a shared resource that must be reused across the JVM," +
                 "so that only a few instances are created.");
@@ -657,7 +657,7 @@ public void expire() {
         public String toString() {
             final long currentTime = System.nanoTime();
             long remaining = deadline - currentTime + timer.startTime;
-            String simpleClassName = ClassHelper.simpleClassName(this.getClass());
+            String simpleClassName = ClassUtils.simpleClassName(this.getClass());
 
             StringBuilder buf = new StringBuilder(192)
                     .append(simpleClassName)