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While classic Spring AOP (covered in 3) works with advice, pointcuts, and advisors, the new Spring AOP works with advice, pointcuts, advisors, and aspects. Not much of a difference you may think, but as you ll find out soon, things have changed significantly. Literally all the new Spring AOP features are built on top of the integration with the AspectJ AOP framework. (The proxy-based interception mechanism remains in place, so the skills you ve gained from the previous chapter will remain useful.) So what is AspectJ The AspectJ FAQ (http://www.eclipse.org/aspectj/doc/released/ faq.html) answers this question as follows: AspectJ is a simple and practical extension to the Java programming language that adds to Java aspect-oriented programming (AOP) capabilities. AOP allows developers to reap the benefits of modularity for concerns that cut across the natural units of modularity. In objectoriented programs like Java, the natural unit of modularity is the class. In AspectJ, aspects modularize concerns that affect more than one class.

A strong password policy, particularly for people with power, is crucial to security. Having staff members rotate passwords on a regular basis is good common sense. Using strong passwords with a mix of letters, numbers, and symbols helps prevent hackers dictionary attacks. Thankfully, if they should break in, hackers cannot glean passwords from the database, as phpBB encodes passwords in the database using the MD5 one-way algorithm. This prevents intruders from deciphering the passwords in the database should they get that far. This also means that if you forget your password, you will need a new one.

public Object getAttribute(String name)

Note The MD5 one-way algorithm has its advantages and its disadvantages. Passwords must be stored

getAttributeNames() method. This method returns an Enumeration of the attribute names, or an empty Enumeration if there are no request attributes.

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And what is an aspect That is also answered by the same FAQ as follows: Aspects are how developers encapsulate concerns that cut across classes, the natural unit of modularity in Java. From the previous chapter, you know that cross-cutting concerns are modularized as advice. These are encapsulated by an advisor, which combines one advice and one pointcut. This encapsulation tells at which join points in the software the advice is executed. Aspects and advisors seem to have much in common: they both encapsulate concerns that cut across classes. Advice is executed at join points that are matched by a pointcut; however, a given pointcut may not match any join points in an application. Now let s look at what you can do with an aspect: You can declare pointcuts. You can declare errors and warnings for each join point that is selected by the associated pointcut. You can declare new fields, constructors, and methods in classes. These are called inter-type declarations in AspectJ. You can declare one or more advices, each one executed for all joint points matched by a pointcut. When comparing the two, it quickly becomes clear an aspect is a much more sophisticated construct than an advisor. For now, it s sufficient to understand aspects and advisors both encapsulate cross-cutting concerns yet take a different approach.

in the phpBB database, but in their encrypted form. When someone logs in to the forum, the password she supplies at login time is encrypted, and that is compared with the encrypted password stored in the database. No decryption takes place, because the MD5 algorithm is a one-way encryption. This has the advantage of passwords being unlikely to be decrypted (never say never!) should any malicious intruder break into your database. However, this means that any passwords cannot be e-mailed to the forgetful board user, which is a small price to pay for the level of security MD5 affords.

public Enumeration getAttributeNames()

All the permissions in the world won t help you if your board has a flaw in its security, which could let Joe Hacker simply slip past those permissions! Fortunately, the phpBB Group regularly publishes updated versions of phpBB that contain security and other bug fixes. Keeping up with these updates, as tedious as it may be (especially if 11 inspires you to install a ton of modifications), is quite important, as updates have been known to be released in rapid succession. While installing updates can sometimes be a pain and an inconvenience, it is even more inconvenient and painful to catch up with a few updates in succession.

Attributes may be set on the request with the setAttribute() method. This method takes the name of the attribute as a String and the value as an Object. The general naming convention for request attributes is the same as those used for naming Java packages. Portlets can overwrite attributes in the portlet request. If attributes need to be removed from the request, the removeAttribute() method is used.

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