Examples of org.aopalliance.intercept.MethodInterceptor

org.aopalliance.intercept.MethodInterceptor
Intercepts calls on an interface on its way to the target. These are nested "on top" of the target.
The user should implement the {@link #invoke(MethodInvocation)}method to modify the original behavior. E.g. the following class implements a tracing interceptor (traces all the calls on the intercepted method(s)):
```
 class TracingInterceptor implements MethodInterceptor { Object invoke(MethodInvocation i) throws Throwable { System.out.println("method "+i.getMethod()+" is called on "+ i.getThis()+" with args "+i.getArguments()); Object ret=i.proceed(); System.out.println("method "+i.getMethod()+" returns "+ret); return ret; } } 
```


  @Test
  public void testUndeclaredUnheckedException() throws Throwable {
    final RuntimeException unexpectedException = new RuntimeException();
    // Test return value
    MethodInterceptor mi = new MethodInterceptor() {
      @Override
      public Object invoke(MethodInvocation invocation) throws Throwable {
        throw unexpectedException;
      }
    };

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  public void testCloneInvocationToProceedThreeTimes() throws Throwable {
    TestBean tb = new TestBean();
    ProxyFactory pc = new ProxyFactory(tb);
    pc.addInterface(ITestBean.class);


    MethodInterceptor twoBirthdayInterceptor = new MethodInterceptor() {
      @Override
      public Object invoke(MethodInvocation mi) throws Throwable {
        // Clone the invocation to proceed three times
        // "The Moor's Last Sigh": this technology can cause premature aging
        MethodInvocation clone1 = ((ReflectiveMethodInvocation) mi).invocableClone();

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    pc.addInterface(ITestBean.class);


    /**
     * Changes the name, then changes it back.
     */
    MethodInterceptor nameReverter = new MethodInterceptor() {
      @Override
      public Object invoke(MethodInvocation mi) throws Throwable {
        MethodInvocation clone = ((ReflectiveMethodInvocation) mi).invocableClone();
        String oldName = ((ITestBean) mi.getThis()).getName();
        clone.getArguments()[0] = oldName;

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    private final AsyncInterface proxy;


    public DynamicAsyncInterfaceBean() {
      ProxyFactory pf = new ProxyFactory(new HashMap<>());
      DefaultIntroductionAdvisor advisor = new DefaultIntroductionAdvisor(new MethodInterceptor() {
        @Override
        public Object invoke(MethodInvocation invocation) throws Throwable {
          assertTrue(!Thread.currentThread().getName().equals(originalThreadName));
          if (Future.class.equals(invocation.getMethod().getReturnType())) {
            return new AsyncResult<String>(invocation.getArguments()[0].toString());

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    private final AsyncMethodsInterface proxy;


    public DynamicAsyncMethodsInterfaceBean() {
      ProxyFactory pf = new ProxyFactory(new HashMap<>());
      DefaultIntroductionAdvisor advisor = new DefaultIntroductionAdvisor(new MethodInterceptor() {
        @Override
        public Object invoke(MethodInvocation invocation) throws Throwable {
          assertTrue(!Thread.currentThread().getName().equals(originalThreadName));
          if (Future.class.equals(invocation.getMethod().getReturnType())) {
            return new AsyncResult<String>(invocation.getArguments()[0].toString());

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  }


  public void testInterceptorIsInvokedWithNoTarget() throws Throwable {
    // Test return value
    int age = 25;
    MethodInterceptor mi = mock(MethodInterceptor.class);


    AdvisedSupport pc = new AdvisedSupport(new Class<?>[] { ITestBean.class });
    pc.addAdvice(mi);
    AopProxy aop = createAopProxy(pc);


    given(mi.invoke(null)).willReturn(age);


    ITestBean tb = (ITestBean) aop.getProxy();
    assertTrue("correct return value", tb.getAge() == age);
  }

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  private ITestBean getAdvisedProxy(TestBean target) {
    ProxyFactory pf = new ProxyFactory(new Class<?>[]{ITestBean.class});
    pf.setProxyTargetClass(true);


    MethodInterceptor advice = new NopInterceptor();
    Pointcut pointcut = new Pointcut() {
      @Override
      public ClassFilter getClassFilter() {
        return ClassFilter.TRUE;
      }

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    public static void reset() {
      methodNames.clear();
    }


    public PointcutForVoid() {
      setAdvice(new MethodInterceptor() {
        @Override
        public Object invoke(MethodInvocation invocation) throws Throwable {
          methodNames.add(invocation.getMethod().getName());
          return invocation.proceed();
        }

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    // no exception
    tb.hashCode();


    final Exception ex = new UnsupportedOperationException("invoke");
    // Add evil interceptor to head of list
    config.addAdvice(0, new MethodInterceptor() {
      @Override
      public Object invoke(MethodInvocation invocation) throws Throwable {
        throw ex;
      }
    });

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      }
    }


    SimpleFoo target = new SimpleFoo();
    ProxyFactory factory = new ProxyFactory(target);
    factory.addAdvice(new MethodInterceptor() {
      @Override
      public Object invoke(MethodInvocation invocation) throws Throwable {
        return null;
      }
    });

View Full Code Here

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