Google Guice之AOP

标签：google   guice   aop   切面   

<span style="font-size:14px;">@Retention(RetentionPolicy.RUNTIME) @Target(ElementType.METHOD)//标注于方法上
@interface NotOnWeekends {}</span>

1. 编写一注解

@Retention(RetentionPolicy.RUNTIME) @Target(ElementType.METHOD)//标注于方法上
@interface NotOnWeekends {}

public class RealBillingService implements BillingService {

  @NotOnWeekends
  public Receipt chargeOrder(PizzaOrder order, CreditCard creditCard) {
    ...
  }
}

public class WeekendBlocker implements MethodInterceptor {
  public Object invoke(MethodInvocation invocation) throws Throwable {
    Calendar today = new GregorianCalendar();
    if (today.getDisplayName(DAY_OF_WEEK, LONG, ENGLISH).startsWith("S")) {
      throw new IllegalStateException(
          invocation.getMethod().getName() + " not allowed on weekends!");
    }
    return invocation.proceed();
  }
}

public class NotOnWeekendsModule extends AbstractModule {
  protected void configure() {
    bindInterceptor(Matchers.any(), Matchers.annotatedWith(NotOnWeekends.class), 
        new WeekendBlocker());
  }
}

public class NotOnWeekendsModule extends AbstractModule {
  protected void configure() {
    WeekendBlocker weekendBlocker = new WeekendBlocker();
    requestInjection(weekendBlocker);
    bindInterceptor(Matchers.any(), Matchers.annotatedWith(NotOnWeekends.class), 
       weekendBlocker);
  }
}

public class NotOnWeekendsModule extends AbstractModule {
  protected void configure() {
    bindInterceptor(any(),
                    annotatedWith(NotOnWeekends.class),
                    new WeekendBlocker(getProvider(Calendar.class)));
  }
}

Google Guice之AOP

标签：google   guice   aop   切面   

原文地址：http://blog.csdn.net/xtayfjpk/article/details/40748981