Java Enhancer.setCallbacks方法代碼示例

import net.sf.cglib.proxy.Enhancer; //導入方法依賴的package包/類
@Override
public Object postProcessBeforeInstantiation(final Class<?> beanClass, final String beanName) throws BeansException {
    if (_interceptors != null && _interceptors.size() > 0) {
        if (ComponentMethodInterceptable.class.isAssignableFrom(beanClass)) {
            final Enhancer enhancer = new Enhancer();
            enhancer.setSuperclass(beanClass);
            enhancer.setCallbacks(getCallbacks());
            enhancer.setCallbackFilter(getCallbackFilter());
            enhancer.setNamingPolicy(ComponentNamingPolicy.INSTANCE);

            final Object bean = enhancer.create();
            return bean;
        }
    }
    return null;
}
 

import net.sf.cglib.proxy.Enhancer; //導入方法依賴的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.Enhancer; //導入方法依賴的package包/類
@Override
public Object postProcessBeforeInstantiation(Class<?> beanClass, String beanName) throws BeansException {
    if (_interceptors != null && _interceptors.size() > 0) {
        if (ComponentMethodInterceptable.class.isAssignableFrom(beanClass)) {
            Enhancer enhancer = new Enhancer();
            enhancer.setSuperclass(beanClass);
            enhancer.setCallbacks(getCallbacks());
            enhancer.setCallbackFilter(getCallbackFilter());
            enhancer.setNamingPolicy(ComponentNamingPolicy.INSTANCE);

            Object bean = enhancer.create();
            return bean;
        }
    }
    return null;
}
 

import net.sf.cglib.proxy.Enhancer; //導入方法依賴的package包/類
/**
 * Performs a benchmark of an interface implementation using cglib.
 *
 * @return The created instance, in order to avoid JIT removal.
 */
@Benchmark
public ExampleInterface benchmarkCglib() {
    Enhancer enhancer = new Enhancer();
    enhancer.setUseCache(false);
    enhancer.setClassLoader(newClassLoader());
    enhancer.setSuperclass(baseClass);
    CallbackHelper callbackHelper = new CallbackHelper(Object.class, new Class[]{baseClass}) {
        @Override
        protected Object getCallback(Method method) {
            if (method.getDeclaringClass() == baseClass) {
                return new FixedValue() {
                    @Override
                    public Object loadObject() throws Exception {
                        return null;
                    }
                };
            } else {
                return NoOp.INSTANCE;
            }
        }
    };
    enhancer.setCallbackFilter(callbackHelper);
    enhancer.setCallbacks(callbackHelper.getCallbacks());
    return (ExampleInterface) enhancer.create();
}
 

import net.sf.cglib.proxy.Enhancer; //導入方法依賴的package包/類
@Override
public Object createProxy(Interceptor interceptor, Class<?>[] types, MethodPointcut methodPointcut) {
    ProxyType proxyType = evalProxyType(types);
    Enhancer eh = new Enhancer();
    DefaultMethodInterceptor dmi = new DefaultMethodInterceptor(interceptor);
    DefaultDispatcher dispatcher = new DefaultDispatcher(interceptor.getTarget());
    Callback[] callbacks = new Callback[] {
        dmi, dispatcher
    };
    eh.setCallbacks(callbacks);
    CallbackFilter cf = new CallbackFilterAdapter(methodPointcut);
    eh.setCallbackFilter(cf);

    switch (proxyType) {
        case CLASS:
            Class<?> clazz = types[0];
            eh.setSuperclass(clazz);
            return eh.create();
        case INTERFACES:
            eh.setInterfaces(types);
            return eh.create();
    }

    throw new UnsupportedOperationException("Unsupported proxy types!");
}
 

import net.sf.cglib.proxy.Enhancer; //導入方法依賴的package包/類
public T enhance(Class<T> clz) {
    Enhancer enhancer = new Enhancer();
    enhancer.setSuperclass(clz);
    enhancer.setCallbacks(new Callback[]{new PropertyInterceptor<>(this, schema), NoOp.INSTANCE});
    enhancer.setCallbackFilter(new SchemaFilter<>(clz));
    return (T) enhancer.create();
}
 

import net.sf.cglib.proxy.Enhancer; //導入方法依賴的package包/類
/**
 * 代理某一個對象指定方法，並在這個方法執行前後加入新方法，可指定過濾掉非代理的方法
 * @author nan.li
 * @param t
 * @param before 執行目標方法前要執行的方法
 * @param after  執行目標方法後要執行的方法
 * @return
 */
@SuppressWarnings("unchecked")
public static <T> T proxySurround(T t, CustomMethod before, CustomMethod after, CallbackFilter callbackFilter)
{
    MethodInterceptor methodInterceptor = new MethodInterceptor()
    {
        @Override
        public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy)
            throws Throwable
        {
            before.execute(obj, method, args);
            Object result = null;
            try
            {
                result = proxy.invokeSuper(obj, args);
            }
            finally
            {
                after.execute(obj, method, args);
            }
            return result;
        }
    };
    Enhancer enhancer = new Enhancer();
    enhancer.setSuperclass(t.getClass());
    // 回調方法
    //        enhancer.setCallback(methodInterceptor);
    enhancer.setCallbacks(new Callback[] {methodInterceptor, NoOp.INSTANCE});
    //NoOp回調把對方法的調用直接委派到這個方法在父類中的實現。
    //Methods using this Enhancer callback ( NoOp.INSTANCE ) will delegate directly to the default (super) implementation in the base class.
    //setCallbacks中定義了所使用的攔截器，其中NoOp.INSTANCE是CGlib所提供的實際是一個沒有任何操作的攔截器， 他們是有序的。一定要和CallbackFilter裏麵的順序一致。
    enhancer.setCallbackFilter(callbackFilter);
    // 創建代理對象
    return (T)enhancer.create();
}
 

import net.sf.cglib.proxy.Enhancer; //導入方法依賴的package包/類
@SuppressWarnings("unchecked")
public static <T> T create(Class<T> targetClass) throws InstantiationException, IllegalAccessException {
	Enhancer enhancer = new Enhancer();
	enhancer.setSuperclass(targetClass);
	enhancer.setClassLoader(targetClass.getClassLoader());
	enhancer.setCallbackFilter(new TransactionalCallbackFilter());
	Callback[] callbacks = new Callback[]{new DalTransactionInterceptor(), NoOp.INSTANCE};
	enhancer.setCallbacks(callbacks);
	enhancer.setInterfaces(new Class[]{TransactionalIntercepted.class});
	return (T)enhancer.create();
}
 

import net.sf.cglib.proxy.Enhancer; //導入方法依賴的package包/類
public void testSupportProxiesUsingFactoryWithMultipleCallbacks()
    throws NullPointerException {
    final Enhancer enhancer = new Enhancer();
    enhancer.setCallbacks(new Callback[]{

        new DelegatingInterceptor(null), new DelegatingHandler(null),
        new DelegatingDispatcher(null), NoOp.INSTANCE});
    enhancer.setCallbackFilter(new CallbackFilter() {
        int i = 1;

        public int accept(Method method) {
            if (method.getDeclaringClass() == Runnable.class) {
                return 0;
            }
            return i < 3 ? i++ : i;
        }
    });
    enhancer.setInterfaces(new Class[]{Runnable.class});
    enhancer.setUseFactory(true);
    final Runnable orig = (Runnable)enhancer.create();
    final String xml = xstream.toXML(orig);
    final Factory deserialized = (Factory)xstream.fromXML(xml);
    assertTrue("Not a Runnable anymore", deserialized instanceof Runnable);
    Callback[] callbacks = deserialized.getCallbacks();
    assertEquals(4, callbacks.length);
    assertTrue(callbacks[0] instanceof DelegatingInterceptor);
    assertTrue(callbacks[1] instanceof DelegatingHandler);
    assertTrue(callbacks[2] instanceof DelegatingDispatcher);
    assertTrue(callbacks[3] instanceof NoOp);
}
 

import net.sf.cglib.proxy.Enhancer; //導入方法依賴的package包/類
public void testThrowsExceptionForProxiesNotUsingFactoryWithMultipleCallbacks()
    throws NullPointerException {
    final Enhancer enhancer = new Enhancer();
    enhancer.setCallbacks(new Callback[]{

        new DelegatingInterceptor(null), new DelegatingHandler(null),
        new DelegatingDispatcher(null), NoOp.INSTANCE});
    enhancer.setCallbackFilter(new CallbackFilter() {
        int i = 1;

        public int accept(Method method) {
            if (method.getDeclaringClass() == Runnable.class) {
                return 0;
            }
            return i < 3 ? i++ : i;
        }
    });
    enhancer.setInterfaces(new Class[]{Runnable.class});
    enhancer.setUseFactory(false);
    final Runnable orig = (Runnable)enhancer.create();
    try {
        xstream.toXML(orig);
        fail("Thrown " + ConversionException.class.getName() + " expected");
    } catch (final ConversionException e) {
        
    }
}
 

import net.sf.cglib.proxy.Enhancer; //導入方法依賴的package包/類
public static TableDao getAuthInstance(AuthProxy authProxy) {
    Enhancer en=new Enhancer(); // Enhancer用來生成一個原有類的子類
    // 進行代理
    en.setSuperclass(TableDao.class);
    // 設置織入邏輯
    // en.setCallback(authProxy);
    // en.setCallbacks()方法裏的數組參數順序就是上麵方法的返回值所代表的方法攔截器，如果return 0則使用authProxy攔截器，
    // return 1則使用NoOp.INSTANCE攔截器，NoOp.INSTANCE是默認的方法攔截器，不做什麽處理。
    en.setCallbacks(new Callback[]{authProxy, NoOp.INSTANCE}); // 設置兩個方法攔截器
    en.setCallbackFilter(new AuthProxyFilter());
    // 生成代理實例
    return (TableDao)en.create();
}
 

import net.sf.cglib.proxy.Enhancer; //導入方法依賴的package包/類
@SuppressWarnings("unchecked")
public <T> T getProxy(TypeToken<T> type) {
    Class<? super T> cls = type.getRawType();

    if (isTerminal(type)) {
        return (T) Defaults.defaultValue(cls);
    }

    Enhancer e = new Enhancer();
    if (Enhancer.isEnhanced(cls)) {
        e.setSuperclass(cls.getSuperclass());
        e.setInterfaces(cls.getInterfaces());
    } else {
        e.setSuperclass(cls);
    }
    e.setCallbackFilter(FINALIZE_FILTER);
    e.setCallbacks(new Callback[] { NoOp.INSTANCE, new MethodInterceptor() {

        @Override
        public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
            invocations.add(new MethodInvocation<Object>(type, method, Arrays.asList(args)));

            return getProxy(type.resolveType(method.getGenericReturnType()));
        }

    } });

    try {
        return (T) e.create();
    } catch (Exception ex) {
        throw new RuntimeException("Error while creating proxy of " + type, ex);
    }
}
 

import net.sf.cglib.proxy.Enhancer; //導入方法依賴的package包/類
@Override
public <T> T createProxy(Class<T> localizable, LocalizationProvider localizationProvider) {
    Method[] methods = localizable.getDeclaredMethods();

    List<Callback> callbacks = new ArrayList<Callback>(methods.length + 1);
    final Map<Method, Integer> method2CallbackIndex = new HashMap<Method, Integer>(methods.length);

    callbacks.add(NoOp.INSTANCE);
    for (Method localizableMethod : methods) {
        callbacks.add(createCallback(localizationProvider, localizableMethod));
        method2CallbackIndex.put(localizableMethod, callbacks.size() - 1);
    }

    CallbackFilter callbackFilter = new CallbackFilter() {
        @Override
        public int accept(Method method) {
            Integer index = method2CallbackIndex.get(method);
            return index == null ? 0 : index;
        }
    };

    Enhancer enhancer = new Enhancer();
    enhancer.setInterfaces(new Class[]{localizable});
    enhancer.setCallbackFilter(callbackFilter);
    enhancer.setCallbacks(callbacks.toArray(new Callback[callbacks.size()]));
    enhancer.setUseFactory(false);

    @SuppressWarnings("unchecked")
    T instance = (T) enhancer.create();
    return instance;
}
 

import net.sf.cglib.proxy.Enhancer; //導入方法依賴的package包/類
@Override
public Object unmarshal(final HierarchicalStreamReader reader, final UnmarshallingContext context) {
    final Enhancer enhancer = new Enhancer();
    reader.moveDown();
    enhancer.setSuperclass((Class<?>)context.convertAnother(null, Class.class));
    reader.moveUp();
    reader.moveDown();
    final List<Class<?>> interfaces = new ArrayList<Class<?>>();
    while (reader.hasMoreChildren()) {
        reader.moveDown();
        interfaces.add((Class<?>)context.convertAnother(null, mapper.realClass(reader.getNodeName())));
        reader.moveUp();
    }
    enhancer.setInterfaces(interfaces.toArray(new Class[interfaces.size()]));
    reader.moveUp();
    reader.moveDown();
    final boolean useFactory = Boolean.valueOf(reader.getValue()).booleanValue();
    enhancer.setUseFactory(useFactory);
    reader.moveUp();

    final List<Callback> callbacksToEnhance = new ArrayList<Callback>();
    final List<Callback> callbacks = new ArrayList<Callback>();
    Map<Method, Integer> callbackIndexMap = null;
    reader.moveDown();
    if ("callbacks".equals(reader.getNodeName())) {
        reader.moveDown();
        @SuppressWarnings("unchecked")
        final Map<Method, Integer> typedMap = (Map<Method, Integer>)context.convertAnother(null, HashMap.class);
        callbackIndexMap = typedMap;
        reader.moveUp();
        while (reader.hasMoreChildren()) {
            reader.moveDown();
            readCallback(reader, context, callbacksToEnhance, callbacks);
            reader.moveUp();
        }
    } else {
        readCallback(reader, context, callbacksToEnhance, callbacks);
    }
    enhancer.setCallbacks(callbacksToEnhance.toArray(new Callback[callbacksToEnhance.size()]));
    if (callbackIndexMap != null) {
        enhancer.setCallbackFilter(new ReverseEngineeredCallbackFilter(callbackIndexMap));
    }
    reader.moveUp();
    Object result = null;
    while (reader.hasMoreChildren()) {
        reader.moveDown();
        if (reader.getNodeName().equals("serialVersionUID")) {
            enhancer.setSerialVersionUID(Long.valueOf(reader.getValue()));
        } else if (reader.getNodeName().equals("instance")) {
            result = create(enhancer, callbacks, useFactory);
            super.doUnmarshalConditionally(result, reader, context);
        }
        reader.moveUp();
    }
    if (result == null) {
        result = create(enhancer, callbacks, useFactory);
    }
    return serializationMethodInvoker.callReadResolve(result);
}
 

import net.sf.cglib.proxy.Enhancer; //導入方法依賴的package包/類
/**
 * 代理一個對象<br>
 * 僅代理其列出的幾個方法
 * @author Administrator
 * @param t
 * @param before
 * @param after
 * @param methodNames
 * @return
 */
@SuppressWarnings("unchecked")
public static <T> T proxySurroundIncludes(T t, CustomMethod before, CustomMethod after, String... methodNames)
{
    MethodInterceptor methodInterceptor = new MethodInterceptor()
    {
        @Override
        public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy)
            throws Throwable
        {
            before.execute(obj, method, args);
            Object result = null;
            try
            {
                result = proxy.invokeSuper(obj, args);
            }
            finally
            {
                after.execute(obj, method, args);
            }
            return result;
        }
    };
    Enhancer enhancer = new Enhancer();
    enhancer.setSuperclass(t.getClass());
    enhancer.setCallbacks(new Callback[] {methodInterceptor, NoOp.INSTANCE});
    enhancer.setCallbackFilter(new CallbackFilter()
    {
        @Override
        public int accept(Method paramMethod)
        {
            //僅判斷代理的情況
            String name = paramMethod.getName();
            if (ArrayUtils.contains(methodNames, name))
            {
                return ProxyFlag.DO_PROXY.get();
            }
            //默認不代理
            return ProxyFlag.DO_NOT_PROXY.get();
        }
    });
    // 創建代理對象
    return (T)enhancer.create();
}