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Actually, the Spring 2.0 AOP framework supports a sixth advice type: the introduction advice. We won t discuss this advice type in this book since it s not often used. You can just remember it is available and that it can be used to add methods and properties to the advised class.

phpBB s IP manager helps you, with reasonable accuracy, see if a user is masquerading with multiple identities on your site, which is useful in terms of bans. Clicking the Look up IP address link next to the IP address associated with the post permits you to see the host name of the user (in most cases), which typically identifies the Internet service provider he is using to access your site. From there, you can take that information to a site such as samspade.org or network-tools.com, run a WHOIS query, and determine an abuse address, for example. You can search on the posting history of users who have posted from that IP address. Finally, phpBB gives the other IP addresses the user has posted from, for further cross-referencing work.

public void setProperty(String key, String value) public void addProperty(String key, String value)

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Caution Treat users IP address information with the utmost care. Releasing that information could put

One example of using properties as part of the standard portlet API is caching. Portlets may set their cache timeout value as a property on the response, using the portlet.expiration-cache property. We discuss caching later in this chapter. The properties also support proprietary features in a portal.

You saw an example of before advice in the previous examples; MessagePrintingAspect contained before advice. Let s take a quick look at the other advice types and how to declare them in an @AspectJ-style aspect.

users in danger of having their computer attacked if they have not taken the proper precautions. Additionally, IP addresses, if configured by the Internet service provider, can give information that some users may believe violates their privacy, right down to the town where they are located. Respect your users privacy and be responsible with IP address information.

We discussed URL encoding in 2 briefly, but we wanted to emphasize the necessity of encoding URLs to resources within the portlet application. The portal may need additional information on the URL to identify which portlet on the page the resource is associated with, especially if there are two instances of the same portlet for a user. If the user s browser does not support cookies, the portal may need to rewrite the URL with the current session ID. The encodeURL() method on PortletResponse takes the path to a resource inside the portlet application. The path may be either an absolute path to a resource on the server, or a full URL with the scheme, server, port (if necessary), and path.

Now that you have improved the security of your board, it s time to talk about those mundane maintenance tasks that administrators love to hate, but are vital to the smooth operation of your community. These include pruning dead posts, managing your database, and caching templates.

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After returning advice is called when a join point has been executed and has exited with a return value or without a return value if the return type is void. Listing 4-7 shows MessagePrintingAspect with after returning advice. Listing 4-7. Printing a Message After a Join Point Has Been Executed Normally package com.apress.springbook.chapter04.aspects; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.AfterReturning; @Aspect public class MessagePrintingAspect { @AfterReturning("execution(* startMatch(..))") public void printMessageWhenTennisMatchHasBeenStartedSuccessfully() { System.out.println("Tennis match was started successfully!"); } }

As your community gets larger and more active, it will inevitably slow down. This is a fact of any forum system you will come across. phpBB, like most other forum software, permits you to reduce the size of your community via a process known as pruning, where posts with no activity after a certain cutoff date are removed from the system.

public java.lang.String encodeURL(String path)

The path must start with a forward slash or be a complete URL, or the method will throw an IllegalArgumentException. Here is a code snippet from a portlet that is writing out a URL:

Caution Pruning a fledgling community is generally discouraged. This is because pruning may result in the community looking rather dead, and that is not the image you want to cast as you try to attract people to your site.

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