Before trying to answer your question, let me just add an important piece of information: JSR 330 (@Inject) was standardized by Guice and Spring projects (announcement from May 2009) and is being reused in JSR 299. This covers basic DI mechanisms in terms of declaring an injection point. Now, back to the question – with … Read more
Let’s imagine you want to log the time taken by some annoted methods using a @LogExecTime annotation. I first create an annotation LogExecTime: @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.METHOD) public @interface LogExecTime { } Then I define an aspect: @Component // For Spring AOP @Aspect public class LogTimeAspect { @Around(value = “@annotation(annotation)”) public Object LogExecutionTime(final ProceedingJoinPoint joinPoint, final LogExecTime … Read more
AccessException is a checked exception, but it was thrown from the method that doesn’t declare it in its throws clause (actually – from the aspect intercepting that method). It’s an abnormal condition in Java, so your exception is wrapped with UndeclaredThrowableException, which is unchecked. To get your exception as is, you can either declare it … Read more
You can tell IntelliJ to not to warn about used for any method/field annotated with the annotation the “unused” method has. It should be a quick fix all you have to do is hit <Alt>+<Enter> and select Suppress for methods annotated by … You don’t need to add anything to you code and you only … Read more
I think that Castle Dynamic Proxy is the solution of choice if dynamic interception can handle your needs. This framework is used internally by a lot of other frameworks that want to offer AOP capabilities. Typically, most of existing IoC containers now provide some dynamic interception mechanisms (Spring.NET, Castle Windsor, StructureMap, etc.) If you already … Read more
I’ve gone down many paths and created many implementations of repositories on different projects and… I’ve thrown the towel in and given up on it, here’s why. Coding for the exception Do you code for the 1% chance your database is going to change from one technology to another? If you’re thinking about your business’s … Read more
Joinpoint: A joinpoint is a candidate point in the Program Execution of the application where an aspect can be plugged in. This point could be a method being called, an exception being thrown, or even a field being modified. These are the points where your aspect’s code can be inserted into the normal flow of … Read more
You should combine a type pointcut with a method pointcut. These pointcuts will do the work to find all public methods inside a class marked with an @Monitor annotation: @Pointcut(“within(@org.rejeev.Monitor *)”) public void beanAnnotatedWithMonitor() {} @Pointcut(“execution(public * *(..))”) public void publicMethod() {} @Pointcut(“publicMethod() && beanAnnotatedWithMonitor()”) public void publicMethodInsideAClassMarkedWithAtMonitor() {} Advice the last pointcut that combines … Read more
C# is not an AOP oriented language. It has some AOP features and you can emulate some others but making AOP with C# is painful. I looked up for ways to do exactly what you wanted to do and I found no easy way to do it. As I understand it, this is what you … Read more
Before understanding the Crosscutting Concern, we have to understand the Concern. A Concern is a term that refers to a part of the system divided on the basis of the functionality. There are two types of concerns: The concerns representing single and specific functionality for primary requirements are known as core concerns. OR Primary functionality … Read more