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.

    public Object create(Class  realMpClass, MessageProcessorId id, Map<String, String> attributes, String fileName, String lineNumber,
                         Object[] constructorArguments)
    {
        try
        {
            Enhancer e = createEnhancer(realMpClass, id, attributes, fileName, lineNumber);
            if (constructorArguments != null && constructorArguments.length != 0)
            {
                Class[] classes = findConstructorArgumentTypes(realMpClass, constructorArguments);
                if (classes != null)
                {
                    return e.create(classes, constructorArguments);
                }
                else
                {
                    throw new Error("The message processor " + id.getFullName() + " could not be created, because " +
                                    "there is no matching constructor");
                }
            }
            else
            {
                return e.create();
            }
        }
        catch (Throwable e)
        {
            logger.warn("The message processor " + id.getFullName() + " could not be mocked");

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    }


    protected Enhancer createEnhancer(Class realMpClass, MessageProcessorId id, Map<String, String> attributes, String fileName, String lineNumber)
    {


        Enhancer e = new Enhancer();
        e.setSuperclass(realMpClass);
        e.setUseCache(false);
        e.setAttemptLoad(true);
        e.setInterceptDuringConstruction(true);
        e.setNamingPolicy(new MunitNamingPolicy());


        if (FactoryBean.class.isAssignableFrom(realMpClass))
        {
            createFactoryBeanCallback(id, attributes, fileName, lineNumber, e);
        }

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                callback.setAttributes(attributes);
                callback.setFileName(fileName);
                callback.setLineNumber(lineNumber);




                Enhancer e = new Enhancer();
                e.setSuperclass(o.getClass());
                e.setInterceptDuringConstruction(true);
                e.setUseCache(false);
                e.setAttemptLoad(true);
                e.setNamingPolicy(new MunitNamingPolicy());
                e.setCallbackTypes(new Class[] {WrapperMunitMessageProcessorInterceptor.class});


                return createProxy(e.createClass(), callback);


            }
            else
            {
                return o;

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        }
      };
    }
      
    // CGLib is amazing
      Enhancer ex = new Enhancer();
      ex.setSuperclass(InjectorContainer.class);
      ex.setInterfaces(new Class[] { Player.class });
    ex.setCallbacks(new Callback[] { NoOp.INSTANCE, implementation });
    ex.setCallbackFilter(callbackFilter);
      
      return (Player) ex.create();
  }

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        public ManagedProxyFactory(Class type, ClassLoader classLoader) {
            this(new Class[]{type}, classLoader);
        }


        public ManagedProxyFactory(Class[] type, ClassLoader classLoader) {
            Enhancer enhancer = new Enhancer();
            if(type.length > 1) { // shrink first -- may reduce from many to one
                type = ClassLoading.reduceInterfaces(type);
            }
            if(type.length == 0) {
                throw new IllegalArgumentException("Cannot generate proxy for 0 interfaces!");
            } else if(type.length == 1) { // Unlikely (as a result of GeronimoManagedBean)
                enhancer.setSuperclass(type[0]);
            } else {
                if(type[0].isInterface()) {
                    enhancer.setSuperclass(Object.class);
                    enhancer.setInterfaces(type);
                } else { // there's a class and reduceInterfaces put the class in the first spot
                    Class[] intfs = new Class[type.length-1];
                    System.arraycopy(type, 1, intfs, 0, intfs.length);
                    enhancer.setSuperclass(type[0]);
                    enhancer.setInterfaces(intfs);
                }
            }
            enhancer.setClassLoader(classLoader);
            enhancer.setCallbackType(MethodInterceptor.class);
            enhancer.setUseFactory(false);
            proxyType = enhancer.createClass();
            fastClass = FastClass.create(proxyType);
        }

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            // create method interceptors
            Callback callback = getPortMethodInterceptor();
            this.methodInterceptors = new Callback[] {NoOp.INSTANCE, callback};


            // create service class
            Enhancer enhancer = new Enhancer();
            enhancer.setClassLoader(new BundleClassLoader(bundle));
            enhancer.setSuperclass(superClass);
            enhancer.setCallbackFilter(new PortMethodFilter());
            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(URL_SERVICE_NAME_CONSTRUCTOR);
        }

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        lookup.put(method.getName(), method);
      }
    }
    
      // MORE CGLIB magic!
      Enhancer ex = EnhancerFactory.getInstance().createEnhancer();
      ex.setSuperclass(Player.class);
      ex.setCallback(new MethodInterceptor() {
      @Override
      public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
        
        // There's no overloaded methods, so we don't care
        Method offlineMethod = lookup.get(method.getName());
        
        // Ignore all other methods
        if (offlineMethod == null) {
          throw new UnsupportedOperationException(
              "The method " + method.getName() + " is not supported for offline players.");
        }


        // Invoke our on method
        return offlineMethod.invoke(SerializedOfflinePlayer.this, args);
      }
      });
      
      return (Player) ex.create();
  }

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    super(advised);
  }


  @Override
  public Object getProxy() {
    Enhancer enhancer = new Enhancer();
    enhancer.setSuperclass(advised.getTargetSource().getTargetClass());
    enhancer.setInterfaces(advised.getTargetSource().getInterfaces());
    enhancer.setCallback(new DynamicAdvisedInterceptor(advised));
    Object enhanced = enhancer.create();
    return enhanced;
  }

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        assertFileExists(file);
        return file;
    }


    private static byte[] createClass(final String name) {
        Enhancer enhancer = new Enhancer();
        enhancer.setNamingPolicy(new NamingPolicy() {
            public String getClassName(String prefix, String source, Object key, Predicate names) {
                return name;
            }
        });
        enhancer.setClassLoader(new URLClassLoader(new URL[0]));
        enhancer.setSuperclass(Object.class);
        enhancer.setInterfaces(new Class[]{Serializable.class});
        enhancer.setCallbackTypes(new Class[]{NoOp.class});
        enhancer.setUseFactory(false);
        ByteCode byteCode = new ByteCode();
        enhancer.setStrategy(byteCode);
        enhancer.createClass();


        return byteCode.getByteCode();
    }

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        //create a new ConnectionFactory
        connectionFactory = connectionManagerContainer.createConnectionFactory(managedConnectionFactory);


        //build proxy
        if (isProxyable) {
            Enhancer enhancer = new Enhancer();
            enhancer.setInterfaces(allImplementedInterfaces);
            enhancer.setCallbackType(net.sf.cglib.proxy.MethodInterceptor.class);
            enhancer.setUseFactory(false);//????
            interceptor = new ConnectorMethodInterceptor(kernel.getKernelName(), ObjectName.getInstance(objectName));
            enhancer.setCallbacks(new Callback[]{interceptor});
            proxy = enhancer.create(new Class[0], new Object[0]);
        } else {
            proxy = connectionFactory;
        }


        //connect proxy

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