Examples of net.sf.cglib.proxy.Enhancer

net.sf.cglib.proxy.Enhancer
Generates dynamic subclasses to enable method interception. This class started as a substitute for the standard Dynamic Proxy support included with JDK 1.3, but one that allowed the proxies to extend a concrete base class, in addition to implementing interfaces. The dynamically generated subclasses override the non-final methods of the superclass and have hooks which callback to user-defined interceptor implementations.
The original and most general callback type is the {@link MethodInterceptor}, which in AOP terms enables "around advice"--that is, you can invoke custom code both before and after the invocation of the "super" method. In addition you can modify the arguments before calling the super method, or not call it at all.
Although MethodInterceptor is generic enough to meet any interception need, it is often overkill. For simplicity and performance, additional specialized callback types, such as {@link LazyLoader} are also available.Often a single callback will be used per enhanced class, but you can control which callback is used on a per-method basis with a {@link CallbackFilter}.
The most common uses of this class are embodied in the static helper methods. For advanced needs, such as customizing the ClassLoader to use, you should create a new instance of Enhancer. Other classes within CGLIB follow a similar pattern.
All enhanced objects implement the {@link Factory} interface, unless {@link #setUseFactory} isused to explicitly disable this feature. The Factory interface provides an API to change the callbacks of an existing object, as well as a faster and easier way to create new instances of the same type.
For an almost drop-in replacement for java.lang.reflect.Proxy, see the {@link Proxy} class.


  private ProxyDataObjectInstantiator() {
  }


  public <T> T newInstance(Class<T> classToInstantiate) {
    Enhancer enhancer = new Enhancer();
    enhancer.setSuperclass(classToInstantiate);
    enhancer.setCallback(NoOpInterceptor.INSTANCE);
    return (T) enhancer.create();
  }

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  public <T> T newInstance(Class<T> classToInstantiate, Object[] args) {
    List<Class<?>> argTypes = new ArrayList<Class<?>>();
    for (Object arg : args) {
      argTypes.add(MappingUtils.getRealClass(arg.getClass()));
    }
    Enhancer enhancer = new Enhancer();
    enhancer.setSuperclass(classToInstantiate);
    enhancer.setCallback(NoOpInterceptor.INSTANCE);
    return (T) enhancer.create(argTypes.toArray(new Class[0]), args);
  }

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    enhancer.setCallback(NoOpInterceptor.INSTANCE);
    return (T) enhancer.create(argTypes.toArray(new Class[0]), args);
  }


  public Object newInstance(Class<?>[] interfacesToProxy, final Object target) {
    Enhancer enhancer = new Enhancer();
    enhancer.setInterfaces(interfacesToProxy);
    enhancer.setCallback(new Dispatcher() {
      public Object loadObject() throws Exception {
        return target;
      }
    });
    return enhancer.create();
  }

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            Object cached = channels.get(c);
            if (cached != null)
                return cached;
            
            ChannelInterceptor interceptor = new ChannelInterceptor((Channel) c, serviceStat);
            Enhancer e = new Enhancer();
            e.setSuperclass(c.getClass());
            e.setCallbackType(ChannelInterceptor.class);
            e.setUseFactory(false);


            Class mock = e.createClass();
            Enhancer.registerCallbacks(mock, new Callback[] { interceptor });
            
            try
            {
                cached = Sun14ReflectionProvider.newInstance(mock);

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    @Override
    public void register(Transport transport)
    {
        TransportInterceptor interceptor = new TransportInterceptor(transport, serviceStat);
        Enhancer e = new Enhancer();
        e.setSuperclass(transport.getClass());
        e.setCallbackType(TransportInterceptor.class);
        e.setUseFactory(false);


        Class mock = e.createClass();
        Enhancer.registerCallbacks(mock, new Callback[] { interceptor });
        
        try
        {
            Object t = Sun14ReflectionProvider.newInstance(mock);

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            environment.setConfigId(configId);
            ArtifactManager artifactManager = new DefaultArtifactManager();
            ArtifactResolver artifactResolver = new DefaultArtifactResolver(artifactManager, Collections.EMPTY_SET, null);
            SimpleConfigurationManager configurationManager = new SimpleConfigurationManager(Collections.EMPTY_SET, artifactResolver, Collections.EMPTY_SET);
            DeploymentContext context = new DeploymentContext(basedir, null, environment, null, ConfigurationModuleType.CAR, new Jsr77Naming(), configurationManager, Collections.EMPTY_SET);
            Enhancer enhancer = new Enhancer();
            enhancer.setInterfaces(new Class[]{DataSource.class});
            enhancer.setCallbackType(MethodInterceptor.class);
            enhancer.setStrategy(new DefaultGeneratorStrategy() {
                public byte[] transform(byte[] b) {
                    classBytes = b;
                    return b;
                }
            });
            enhancer.setClassLoader(new URLClassLoader(new URL[0], this.getClass().getClassLoader()));
            Class type = enhancer.createClass();
            URI location = new URI("cglib/");
            context.addClass(location, type.getName(), classBytes);
            ClassLoader cl = context.getClassLoader();
            Class loadedType = cl.loadClass(type.getName());
            assertTrue(DataSource.class.isAssignableFrom(loadedType));

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            // create method interceptors
            Callback callback = new ServiceMethodInterceptor(seiPortNameToFactoryMap);
            this.methodInterceptors = new Callback[]{SerializableNoOp.INSTANCE, callback};
         
            // create service class
            Enhancer enhancer = new Enhancer();
            enhancer.setClassLoader(classLoader);
            enhancer.setSuperclass(ServiceImpl.class);
            enhancer.setInterfaces(new Class[]{serviceInterface});
            enhancer.setCallbackFilter(new NoOverrideCallbackFilter(Service.class));
            enhancer.setCallbackTypes(new Class[]{NoOp.class, MethodInterceptor.class});
            enhancer.setUseFactory(false);
            enhancer.setUseCache(false);
            this.enhancedServiceClass = enhancer.createClass();


            // get constructor
            this.serviceConstructor = 
                FastClass.create(this.enhancedServiceClass).getConstructor(SERVICE_CONSTRUCTOR_TYPES);
        }

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        }
        TypeInfo.register(typeInfo, typeMapping);
    }


    private Class enhanceServiceEndpointInterface(Class serviceEndpointInterface, ClassLoader classLoader) {
        Enhancer enhancer = new Enhancer();
        enhancer.setClassLoader(classLoader);
        enhancer.setSuperclass(GenericServiceEndpointWrapper.class);
        enhancer.setInterfaces(new Class[]{serviceEndpointInterface});
        enhancer.setCallbackFilter(new NoOverrideCallbackFilter(GenericServiceEndpointWrapper.class));
        enhancer.setCallbackTypes(new Class[]{NoOp.class, MethodInterceptor.class});
        enhancer.setUseFactory(false);
        enhancer.setUseCache(false);


        return enhancer.createClass();
    }

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    }
    else
    {
      CGLibInterceptor handler = new CGLibInterceptor(type, locator);


      Enhancer e = new Enhancer();
      e.setInterfaces(new Class[] { Serializable.class, ILazyInitProxy.class,
          IWriteReplace.class });
      e.setSuperclass(type);
      e.setCallback(handler);
      e.setNamingPolicy(new DefaultNamingPolicy()
      {
        @Override
        public String getClassName(final String prefix, final String source,
          final Object key, final Predicate names)
        {
          return super.getClassName("WICKET_" + prefix, source, key, names);
        }
      });


      return e.create();
    }
  }

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        basedir.mkdirs();
        try {
            basedir.deleteOnExit();
            URI configID = new URI("test");
            DeploymentContext context = new DeploymentContext(basedir, configID, ConfigurationModuleType.CAR, null, "foo", "bar", null);
            Enhancer enhancer = new Enhancer();
            enhancer.setInterfaces(new Class[]{DataSource.class});
            enhancer.setCallbackType(MethodInterceptor.class);
            enhancer.setStrategy(new DefaultGeneratorStrategy() {
                public byte[] transform(byte[] b) {
                    classBytes = b;
                    return b;
                }
            });
            enhancer.setClassLoader(new URLClassLoader(new URL[0], this.getClass().getClassLoader()));
            Class type = enhancer.createClass();
            URI location = new URI("cglib/");
            context.addClass(location, type.getName(), classBytes, true);
            ClassLoader cl = context.getClassLoader(null);
            Class loadedType = cl.loadClass(type.getName());
            assertTrue(DataSource.class.isAssignableFrom(loadedType));

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