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package FDynamic.Proxy.AOP;
import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.*;
public class CGLibContainer {
public static enum InterceptPoint {
BEFORE, AFTER, EXCEPTION
}
//CGLibContainer在初始化的时候，会分析带有@Aspect注解的类，分析出每个类的方法在
//调用前、调用后、出现异常时该调用哪些方法，在创建该类的对象时，如果有需要被调用的方法，
//则创建一个动态代理对象。
static Class<?>[] aspects = new Class<?>[] { LogAspect.class, ExceptionAspect.class };
static Map<Class<?>, Map<InterceptPoint, List<Method>>> interceptMethodsMap = new HashMap<>();
static {
init();
}
/**
* 对每个切面，即带有@Aspect注解的类cls，查找其before/after/exception方法，
* 调用方法addInterceptMethod将其加入目标类的切点方法列表中
*/
private static void init() {
for (Class<?> cls : aspects) {
Aspect aspect = cls.getAnnotation(Aspect.class);
if (aspect != null) {
Method before = getMethod(cls, "before", new Class<?>[] { Object.class, Method.class, Object[].class });
Method after = getMethod(cls, "after",
new Class<?>[] { Object.class, Method.class, Object[].class, Object.class });
Method exception = getMethod(cls, "exception",
new Class<?>[] { Object.class, Method.class, Object[].class, Throwable.class });
Class<?>[] intercepttedArr = aspect.value();
for (Class<?> interceptted : intercepttedArr) {
addInterceptMethod(interceptted, InterceptPoint.BEFORE, before);
addInterceptMethod(interceptted, InterceptPoint.AFTER, after);
addInterceptMethod(interceptted, InterceptPoint.EXCEPTION, exception);
}
}
}
}
private static Method getMethod(Class<?> cls, String name, Class<?>[] paramTypes) {
try {
return cls.getMethod(name, paramTypes);
} catch (NoSuchMethodException e) {
return null;
}
}
/**
*
* @param cls
* @param point
* @param method
*/
private static void addInterceptMethod(Class<?> cls, InterceptPoint point, Method method) {
if (method == null) {
return;
}
Map<InterceptPoint, List<Method>> map = interceptMethodsMap.get(cls);
if (map == null) {
map = new HashMap<>();
interceptMethodsMap.put(cls, map);
}
List<Method> methods = map.get(point);
if (methods == null) {
methods = new ArrayList<>();
map.put(point, methods);
}
methods.add(method);
}
/**
* 得到响应的切面
* @param cls
* @param point
* @return
*/
static List<Method> getInterceptMethods(Class<?> cls,
InterceptPoint point) {
Map<InterceptPoint, List<Method>> map = interceptMethodsMap.get(cls);
if (map == null) {
return Collections.emptyList();
}
List<Method> methods = map.get(point);
if (methods == null) {
return Collections.emptyList();
}
return methods;
}
/**
* 根据原始类的实际类型查找应该执行的before/after/exception方法列表，在调用原始方法前
* 执行before方法，
*/
static class AspectInterceptor implements MethodInterceptor {
@Override
public Object intercept(Object object, Method method,
Object[] args, MethodProxy proxy) throws Throwable {
//执行before方法
List<Method> beforeMethods = getInterceptMethods(
object.getClass().getSuperclass(), InterceptPoint.BEFORE);
for (Method m : beforeMethods) {
m.invoke(null, new Object[] { object, method, args });
}
try {
// 调用原始方法
Object result = proxy.invokeSuper(object, args);
// 执行after方法
List<Method> afterMethods = getInterceptMethods(
object.getClass().getSuperclass(), InterceptPoint.AFTER);
for (Method m : afterMethods) {
m.invoke(null, new Object[] { object, method, args, result });
}
return result;
} catch (Throwable e) {
//执行exception方法
List<Method> exceptionMethods = getInterceptMethods(
object.getClass().getSuperclass(), InterceptPoint.EXCEPTION);
for (Method m : exceptionMethods) {
m.invoke(null, new Object[] { object, method, args, e });
}
throw e;
}
}
}
/**
* 如果类型cls不需要增强，则直接调用cls.newInstance()，否则使用cglib创建动态代理，
* callback为AspectInterceptor
* @param cls
* @param <T>
* @return
* @throws InstantiationException
* @throws IllegalAccessException
*/
private static <T> T createInstance(Class<T> cls)
throws InstantiationException, IllegalAccessException {
if (!interceptMethodsMap.containsKey(cls)) {
return (T) cls.newInstance();
}
Enhancer enhancer = new Enhancer();
enhancer.setSuperclass(cls);
enhancer.setCallback(new AspectInterceptor());
return (T) enhancer.create();
}
/**
* getInstance方法调用createInstance创建实例
* @param cls
* @param <T>
* @return
*/
public static <T> T getInstance(Class<T> cls) {
try {
T obj = createInstance(cls);
Field[] fields = cls.getDeclaredFields();
for (Field f : fields) {
if (f.isAnnotationPresent(SimpleInject.class)) {
if (!f.isAccessible()) {
f.setAccessible(true);
}
Class<?> fieldCls = f.getType();
f.set(obj, getInstance(fieldCls));
}
}
return obj;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}