Java MethodInterceptor類代碼示例

import net.sf.cglib.proxy.MethodInterceptor; //導入依賴的package包/類
public static Object createProxy(Object realObject) {
    try {
        MethodInterceptor interceptor = new HammerKiller();
        Enhancer enhancer = new Enhancer();
        enhancer.setSuperclass(realObject.getClass());
        enhancer.setCallbackType(interceptor.getClass());
        Class classForProxy = enhancer.createClass();
        Enhancer.registerCallbacks(classForProxy, new Callback[]{interceptor});
        Object createdProxy = classForProxy.newInstance();

        for (Field realField : FieldUtils.getAllFieldsList(realObject.getClass())) {
            if (Modifier.isStatic(realField.getModifiers()))
                continue;
            realField.setAccessible(true);

            realField.set(createdProxy, realField.get(realObject));
        }
        CreeperKiller.LOG.info("Removed HammerCore main menu hook, ads will no longer be displayed.");
        return createdProxy;
    } catch (Exception e) {
        CreeperKiller.LOG.error("Failed to create a proxy for HammerCore ads, they will not be removed.", e);
    }
    return realObject;
}
 

import net.sf.cglib.proxy.MethodInterceptor; //導入依賴的package包/類
ReflectiveParserImpl(Class<?> base, List<Property<?, ?>> properties) {
    InjectionChecks.checkInjectableCGLibProxyBase(base);

    this.properties = properties;
    this.propertyNames = properties.stream()
                                   .flatMap(property -> property.parser.names().stream())
                                   .collect(Collectors.toImmutableSet());

    final Enhancer enhancer = new Enhancer();
    enhancer.setSuperclass(base);
    enhancer.setInterfaces(new Class[]{ type.getRawType() });
    enhancer.setCallbackType(MethodInterceptor.class);
    enhancer.setUseFactory(true);
    this.impl = enhancer.createClass();
    this.injector = getMembersInjector((Class<T>) impl);
}
 

import net.sf.cglib.proxy.MethodInterceptor; //導入依賴的package包/類
/**
 * Adds transaction support to the page. The transaction support captures execution time of methods annotated with
 * {@link io.devcon5.pageobjects.tx.Transaction}
 *
 * @param <T>
 *
 * @param transactionSupport
 *         the transactionSupport element to be enhanced.
 * @return
 */
@SuppressWarnings("unchecked")
public static <T extends TransactionSupport> T addTransactionSupport(TransactionSupport transactionSupport) {
    return (T) Enhancer.create(transactionSupport.getClass(), (MethodInterceptor) (obj, method, args, proxy) -> {
        final Optional<String> txName = getTxName(transactionSupport, method);
        try {
            txName.ifPresent(transactionSupport::txBegin);
            Object result = method.invoke(transactionSupport, args);
            //dynamically enhance return values, if they are transactionSupport and not yet enhanced
            //this is required, i.e. if method return 'this' or create new objects which will
            //not be enhanced
            if (!isCGLibProxy(result) && result instanceof TransactionSupport) {
                result = addTransactionSupport(transactionSupport);
            }
            return result;
        } finally {
            txName.ifPresent(transactionSupport::txEnd);
        }
    });
}
 

import net.sf.cglib.proxy.MethodInterceptor; //導入依賴的package包/類
public static void main(String[] args) {
	while(true) {
		Enhancer enhancer = new Enhancer();
		enhancer.setSuperclass(ClassPermGenOOM.class);
		enhancer.setUseCache(Boolean.FALSE);
		
		enhancer.setCallback(new MethodInterceptor() {
			
			@Override
			public Object intercept(Object arg0, Method arg1, Object[] arg2,
					MethodProxy arg3) throws Throwable {
				return arg3.invokeSuper(arg0, arg2);
			}
		});
		enhancer.create();
	}
}
 

import net.sf.cglib.proxy.MethodInterceptor; //導入依賴的package包/類
public static void main(String[] args) {
    Tmp tmp = new Tmp();
    while (!Thread.interrupted()) {
        Enhancer enhancer = new Enhancer();
        enhancer.setSuperclass(Tmp.class);
        enhancer.setUseCache(false);
        enhancer.setCallback(new MethodInterceptor() {
            @Override
            public Object intercept(Object arg0, Method arg1, Object[] arg2, MethodProxy arg3) throws Throwable {
                return arg3.invokeSuper(arg0, arg2);
            }
        });
        enhancer.create();
    }
    System.out.println(tmp.hashCode());
}
 

import net.sf.cglib.proxy.MethodInterceptor; //導入依賴的package包/類
/**
 * Wraps the specified API object to dump caller stacktraces right before invoking
 * native methods
 * 
 * @param api API
 * @return wrapped API
 */
static <T> T wrapWithCrashStackLogging(final Class<T> apiClazz, final T api) {

	try {
		return AccessController.doPrivileged(new PrivilegedExceptionAction<T>() {

			@Override
			public T run() throws Exception {
				MethodInterceptor handler = new MethodInterceptorWithStacktraceLogging<T>(api);
				T wrapperWithStacktraceLogging = (T) Enhancer.create(apiClazz, handler);
				return wrapperWithStacktraceLogging;
			}
		});
	} catch (PrivilegedActionException e) {
		e.printStackTrace();
		return api;
	}
}
 

import net.sf.cglib.proxy.MethodInterceptor; //導入依賴的package包/類
@SuppressWarnings("unchecked")
public T decode(final BitBuffer buffer, final Resolver resolver,
                final Builder builder) throws DecodingException {
    final int size = wrapped.getSize().eval(resolver);
    final long pos = buffer.getBitPos();
    ClassLoader loader = this.getClass().getClassLoader();
    Enhancer enhancer = new Enhancer();
    enhancer.setClassLoader(loader);
    enhancer.setSuperclass(type);
    enhancer.setCallback(new MethodInterceptor() {

        private Object actual;

        public Object intercept(Object target, Method method,
                                Object[] args, MethodProxy proxy) throws Throwable {
            if (actual == null) {
                buffer.setBitPos(pos);
                actual = wrapped.decode(buffer, resolver, builder);
            }
            return proxy.invoke(actual, args);
        }
    });
    buffer.setBitPos(pos + size);
    return (T) enhancer.create();
}
 

import net.sf.cglib.proxy.MethodInterceptor; //導入依賴的package包/類
@SuppressWarnings("unchecked")
protected static <T> Class<T> createEnhancedClass(Class<T> proxiedClass, Class<?>... implementedInterfaces) {
    Enhancer enhancer = new Enhancer();

    Set<Class<?>> interfaces = new HashSet<Class<?>>();
    if (proxiedClass.isInterface()) {
        enhancer.setSuperclass(Object.class);
        interfaces.add(proxiedClass);
    } else {
        enhancer.setSuperclass(proxiedClass);
    }
    if (implementedInterfaces != null && implementedInterfaces.length > 0) {
        interfaces.addAll(asList(implementedInterfaces));
    }
    if (!interfaces.isEmpty()) {
        enhancer.setInterfaces(interfaces.toArray(new Class<?>[interfaces.size()]));
    }
    enhancer.setCallbackType(MethodInterceptor.class);
    enhancer.setUseFactory(true);
    return enhancer.createClass();
}
 

import net.sf.cglib.proxy.MethodInterceptor; //導入依賴的package包/類
@Override
public <T> T createDynamicProxy(Class<T> type, Supplier<T> targetSupplier, String descriptionPattern, Object... descriptionParams) {
    final String description = String.format(descriptionPattern, descriptionParams);
    final Enhancer enhancer = new Enhancer();
    enhancer.setClassLoader(new DelegatingClassLoader(type.getClassLoader(), Enhancer.class.getClassLoader()));
    enhancer.setInterfaces(new Class[]{type});
    enhancer.setSuperclass(Object.class);
    enhancer.setCallbackFilter(FILTER);
    enhancer.setCallbacks(new Callback[]{
            (Dispatcher) targetSupplier::get,
            (MethodInterceptor) (proxy, method, params, methodProxy) -> proxy == params[0],
            (MethodInterceptor) (proxy, method, params, methodProxy) -> System.identityHashCode(proxy),
            (MethodInterceptor) (proxy, method, params, methodProxy) -> description
    });
    return type.cast(enhancer.create());
}
 

import net.sf.cglib.proxy.MethodInterceptor; //導入依賴的package包/類
@SuppressWarnings("unchecked")
public T bind() {
    if (__bound == null) {
        __bound = (T) ClassUtils.wrapper(__source).duplicate(Enhancer.create(__targetClass, new MethodInterceptor() {
            public Object intercept(Object targetObject, Method targetMethod, Object[] methodParams, MethodProxy methodProxy) throws Throwable {
                Object _result = methodProxy.invokeSuper(targetObject, methodParams);
                PropertyStateMeta _meta = __propertyStates.get(targetMethod.getName());
                if (_meta != null && ArrayUtils.isNotEmpty(methodParams) && !ObjectUtils.equals(_meta.getOriginalValue(), methodParams[0])) {
                    _meta.setNewValue(methodParams[0]);
                }
                return _result;
            }
        }));
    }
    return __bound;
}
 

import net.sf.cglib.proxy.MethodInterceptor; //導入依賴的package包/類
public void testMe(){
	Article a = (Article) Enhancer.create(Article.class, new Class[]{DynamicUpdatable.class}, null, new Callback[]{
		new MethodInterceptor(){
			public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
				proxy.invokeSuper(obj, args) ;
				
				System.out.println(method.getName()) ;
				
				return null;
			}
		}
	}) ;
	
	assertTrue(a instanceof DynamicUpdatable) ;
	a.getContent() ;
}
 

import net.sf.cglib.proxy.MethodInterceptor; //導入依賴的package包/類
@Override
protected void decorateInstance(T result, final MethodIntercept methodIntercept) {
    MethodInterceptor methodInterceptor = new MethodInterceptor() {
        public Object intercept(final Object proxy, Method method, Object[] args, final MethodProxy superProxy) throws Throwable {
            return methodIntercept.intercept(proxy, new MethodAdapter(method), args, new MethodIntercept.SuperInvoker() {
                public Object invokeSuper(Object[] superArgs) throws Throwable {
                    return superProxy.invokeSuper(proxy, superArgs);
                }
            });
        }
    };
    Factory factory = (Factory) result;
    int callbackCount = factory.getCallbacks().length;
    for(int i = 0; i < callbackCount; i++) {
        factory.setCallback(i, methodInterceptor);
    }
}
 

import net.sf.cglib.proxy.MethodInterceptor; //導入依賴的package包/類
/**
 * Creates a dynamic proxy
 *
 * @param interceptor          The interceptor that manages the invocations to the created proxy
 * @param clazz                The class to be proxied
 * @param failSafe             If true return null if it is not possible to proxy the request class, otherwise throws an UnproxableClassException
 * @param implementedInterface The interfaces that has to be implemented by the new proxy
 * @return The newly created proxy
 */
public static <I extends MethodInterceptor & InvocationHandler, T> T createProxy(I interceptor, Class<T> clazz, boolean failSafe, Class<?>... implementedInterface) {
  if (clazz.isInterface())
    return (T) createNativeJavaProxy(clazz.getClassLoader(), interceptor, concatClasses(new Class<?>[]{clazz}, implementedInterface));
  RuntimeException e;
  try {
    return (T) createEnhancer(interceptor, clazz, implementedInterface).create();
  } catch (RuntimeException ex) {
    e = ex;
  }

  if (Proxy.isProxyClass(clazz))
    return (T) createNativeJavaProxy(clazz.getClassLoader(), interceptor, concatClasses(implementedInterface, clazz.getInterfaces()));
  if (isProxable(clazz)) return ClassImposterizer.INSTANCE.imposterise(interceptor, clazz, implementedInterface);
  if (failSafe) return null;
  throw e;
}
 

import net.sf.cglib.proxy.MethodInterceptor; //導入依賴的package包/類
private static Object newProxyByCglib(Typing typing, Handler handler) {
  Enhancer enhancer = new Enhancer() {
    /** includes all constructors */
    protected void filterConstructors(Class sc, List constructors) {}
  };
  enhancer.setClassLoader(Thread.currentThread().getContextClassLoader());
  enhancer.setUseFactory(true);
  enhancer.setSuperclass(typing.superclass);
  enhancer.setInterfaces(typing.interfaces.toArray(new Class[0]));
  enhancer.setCallbackTypes(new Class[] { MethodInterceptor.class, NoOp.class });
  enhancer.setCallbackFilter(new CallbackFilter() {
    /** ignores bridge methods */
    public int accept(Method method) {
      return method.isBridge() ? 1 : 0;
    }
  });
  Class<?> proxyClass = enhancer.createClass();
  Factory proxy = (Factory) new ObjenesisStd().newInstance(proxyClass);
  proxy.setCallbacks(new Callback[] { asMethodInterceptor(handler), new SerializableNoOp() });
  return proxy;
}
 

import net.sf.cglib.proxy.MethodInterceptor; //導入依賴的package包/類
/**
* 根據目標類targetClass和代理鏈proxyList，生成代理對象
* @param targetClass
* @param proxyList
* @return
*/
  @SuppressWarnings("unchecked")
  public static <T> T createProxy(final Class<?> targetClass, final List<Proxy> proxyList) {
  	
      return (T) Enhancer.create(targetClass, new MethodInterceptor() {
          @Override
          public Object intercept(Object targetObject, Method targetMethod, Object[] methodParams, MethodProxy methodProxy) throws Throwable {
              return new ProxyChain(targetClass, targetObject, targetMethod, methodProxy, methodParams, proxyList).doProxyChain();
          }
      });
  }