[강운덕] [LUCYSUS-1744] mysql byte code수정 기능 추가.

git-svn-id: http://svn.bds.nhncorp.com/pe/hippo-tomcat-profiler/trunk@599 84d0f5b1-2673-498c-a247-62c4ff18d310

src/main/java/com/profiler/util/MetaObject.java

@@ -0,0 +1,70 @@
+package com.profiler.util;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.Arrays;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+public class MetaObject {
+
+    private final Logger logger = Logger.getLogger(MetaObject.class.getName());
+
+    private String methodName;
+    private Class[] args;
+    // 이것을 class loading시 정적 타임에서 생성해 둘수 없는가?
+    private Method methodRef;
+
+    private Object defaultReturnValue = null;
+
+    public MetaObject(String methodName, Class... args) {
+        this.methodName = methodName;
+        this.args = args;
+    }
+
+    public MetaObject(Object defaultReturnValue, String methodName, Class... args) {
+        this.methodName = methodName;
+        this.args = args;
+        this.defaultReturnValue = defaultReturnValue;
+    }
+
+    public Object invoke(Object target, Object... args) {
+        if (target == null) {
+            return defaultReturnValue;
+        }
+
+        Method method = this.methodRef;
+        if (method == null) {
+            // 멀티쓰레드에서 중복 엑세스해도 별 문제 없을것임.
+            Class aClass = target.getClass();
+            method = getMethod(aClass);
+            this.methodRef = method;
+        }
+        return invoke(method, target, args);
+    }
+
+    private Object invoke(Method method, Object target, Object[] args) {
+        if (method == null) {
+            return defaultReturnValue;
+        }
+        try {
+            return method.invoke(target, args);
+        } catch (IllegalAccessException e) {
+            logger.log(Level.WARNING, "invoke fail", e);
+            return defaultReturnValue;
+        } catch (InvocationTargetException e) {
+            logger.log(Level.WARNING, "invoke fail", e);
+            return defaultReturnValue;
+        }
+    }
+
+    private Method getMethod(Class aClass) {
+        try {
+            return aClass.getDeclaredMethod(this.methodName, this.args);
+        } catch (NoSuchMethodException e) {
+            logger.warning(this.methodName + Arrays.toString(this.args) + " not found cls:" + aClass);
+            return null;
+        }
+    }
+
+}