move transformlet classes into internal package

src/main/java/com/alibaba/ttl/threadpool/agent/TtlAgent.java

 package com.alibaba.ttl.threadpool.agent;
 
 
-import com.alibaba.ttl.threadpool.agent.transformlet.TtlExecutorTransformlet;
-import com.alibaba.ttl.threadpool.agent.transformlet.TtlForkJoinTransformlet;
+import com.alibaba.ttl.threadpool.agent.internal.transformlet.impl.TtlExecutorTransformlet;
+import com.alibaba.ttl.threadpool.agent.internal.transformlet.impl.TtlForkJoinTransformlet;
 
 import java.lang.instrument.ClassFileTransformer;
 import java.lang.instrument.Instrumentation;

src/main/java/com/alibaba/ttl/threadpool/agent/TtlTransformer.java

 package com.alibaba.ttl.threadpool.agent;
 
+import com.alibaba.ttl.threadpool.agent.internal.transformlet.JavassistTransformlet;
 import javassist.ClassPool;
 import javassist.CtClass;
 import javassist.LoaderClassPath;

src/main/java/com/alibaba/ttl/threadpool/agent/internal/logging/Logger.java

@@ -4,6 +4,12 @@ import java.text.SimpleDateFormat;
 import java.util.Date;
 import java.util.logging.Level;
 
+/**
+ * logger adaptor for ttl java agent, internal use for ttl usage only!
+ *
+ * @author Jerry Lee (oldratlee at gmail dot com)
+ * @since 2.6.0
+ */
 public abstract class Logger {
     private static volatile int loggerImplType = -1;
 

src/main/java/com/alibaba/ttl/threadpool/agent/JavassistTransformlet.java → src/main/java/com/alibaba/ttl/threadpool/agent/internal/transformlet/JavassistTransformlet.java

-package com.alibaba.ttl.threadpool.agent;
+package com.alibaba.ttl.threadpool.agent.internal.transformlet;
 
 import javassist.CannotCompileException;
 import javassist.CtClass;

src/main/java/com/alibaba/ttl/threadpool/agent/transformlet/TtlExecutorTransformlet.java → src/main/java/com/alibaba/ttl/threadpool/agent/internal/transformlet/impl/TtlExecutorTransformlet.java

-package com.alibaba.ttl.threadpool.agent.transformlet;
+package com.alibaba.ttl.threadpool.agent.internal.transformlet.impl;
 
-import com.alibaba.ttl.threadpool.agent.JavassistTransformlet;
+import com.alibaba.ttl.threadpool.agent.internal.transformlet.JavassistTransformlet;
 import javassist.CannotCompileException;
 import javassist.CtClass;
 import javassist.CtMethod;
@@ -12,8 +12,6 @@ import java.util.HashSet;
 import java.util.Set;
 import com.alibaba.ttl.threadpool.agent.internal.logging.Logger;
 
-import static com.alibaba.ttl.threadpool.agent.transformlet.Utils.signatureOfMethod;
-
 /**
  * TTL {@link JavassistTransformlet} for {@link java.util.concurrent.Executor}.
  *
@@ -69,11 +67,11 @@ public class TtlExecutorTransformlet implements JavassistTransformlet {
             CtClass paraType = parameterTypes[i];
             if (RUNNABLE_CLASS_NAME.equals(paraType.getName())) {
                 String code = String.format("$%d = %s.get($%d, false, true);", i + 1, TTL_RUNNABLE_CLASS_NAME, i + 1);
-                logger.info("insert code before method " + signatureOfMethod(method) + " of class " + method.getDeclaringClass().getName() + ": " + code);
+                logger.info("insert code before method " + Utils.signatureOfMethod(method) + " of class " + method.getDeclaringClass().getName() + ": " + code);
                 insertCode.append(code);
             } else if (CALLABLE_CLASS_NAME.equals(paraType.getName())) {
                 String code = String.format("$%d = %s.get($%d, false, true);", i + 1, TTL_CALLABLE_CLASS_NAME, i + 1);
-                logger.info("insert code before method " + signatureOfMethod(method) + " of class " + method.getDeclaringClass().getName() + ": " + code);
+                logger.info("insert code before method " + Utils.signatureOfMethod(method) + " of class " + method.getDeclaringClass().getName() + ": " + code);
                 insertCode.append(code);
             }
         }

src/main/java/com/alibaba/ttl/threadpool/agent/transformlet/TtlForkJoinTransformlet.java → src/main/java/com/alibaba/ttl/threadpool/agent/internal/transformlet/impl/TtlForkJoinTransformlet.java

-package com.alibaba.ttl.threadpool.agent.transformlet;
+package com.alibaba.ttl.threadpool.agent.internal.transformlet.impl;
 
-import com.alibaba.ttl.threadpool.agent.JavassistTransformlet;
+import com.alibaba.ttl.threadpool.agent.internal.transformlet.JavassistTransformlet;
 import javassist.*;
 
 import java.io.IOException;
 import java.lang.reflect.Modifier;
 import com.alibaba.ttl.threadpool.agent.internal.logging.Logger;
 
-import static com.alibaba.ttl.threadpool.agent.transformlet.Utils.signatureOfMethod;
+import static com.alibaba.ttl.threadpool.agent.internal.transformlet.impl.Utils.signatureOfMethod;
 
 /**
  * TTL {@link JavassistTransformlet} for {@link java.util.concurrent.ForkJoinTask}.

src/main/java/com/alibaba/ttl/threadpool/agent/transformlet/Utils.java → src/main/java/com/alibaba/ttl/threadpool/agent/internal/transformlet/impl/Utils.java

-package com.alibaba.ttl.threadpool.agent.transformlet;
+package com.alibaba.ttl.threadpool.agent.internal.transformlet.impl;
 
 import javassist.CtClass;
 import javassist.CtMethod;
 import javassist.NotFoundException;
 
+/**
+ * @since 2.6.0
+ * @author Jerry Lee (oldratlee at gmail dot com)
+ */
 class Utils {
     /**
      * String like {@code ScheduledFuture scheduleAtFixedRate(Runnable, long, long, TimeUnit)}

src/main/java/com/alibaba/ttl/threadpool/agent/transformlet/package-info.java → src/main/java/com/alibaba/ttl/threadpool/agent/internal/transformlet/package-info.java

@@ -2,6 +2,6 @@
  * TTL {@code Transformlet} implementations by {@code Javassist}.
  *
  * @author Jerry Lee (oldratlee at gmail dot com)
- * @see com.alibaba.ttl.threadpool.agent.JavassistTransformlet
+ * @see com.alibaba.ttl.threadpool.agent.internal.transformlet.JavassistTransformlet
  */
-package com.alibaba.ttl.threadpool.agent.transformlet;
+package com.alibaba.ttl.threadpool.agent.internal.transformlet;