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Caution Now is an excellent time to back up the files from your existing installation to a safe place

We will discuss setting render parameters on the action response later in the chapter. These render parameters become the parameters for the render request of a portlet after the action request is called.

(especially if modifications are installed), just in case something doesn t work out as planned. You may even wish to perform a database backup using the backup tool in the Administration panel for added safety, as discussed in the Backing Up and Restoring Your Database section later in this chapter (though phpBB point releases rarely, if ever, see any wholesale database changes). Backing up is a good habit to get into, and you re better off safe than very, very sorry later.

By now, you know what an aspect looks like and how you can write one yourself. In this section, we ll start with an example of an @AspectJ-style aspect that s configured in the Spring container. This will demonstrate how the Spring AOP framework uses aspects and creates proxy objects. After the example, we ll look at the details of advice types, pointcuts, and proxy objects.

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The portlet request s context path is the part of the URL that corresponds to the portlet s context. For instance, if the URL is http://localhost/portal/ MyPortletApp/MyPortlet, the context path would be /MyPortletApp. If there is a trailing slash on the end of the path, the trailing slash is not part of the context path. If you deploy the portlet application in such a way that it is accessible as the web root (http://localhost:8520/), the request will return an empty string for the context path.

I recommend creating a separate folder for the files you are about to expand. This helps you remember which files and folders have been updated and which ones haven t, saving you from possible confusion and uploading more than necessary. You won t expand everything in the package far from it. You will need to expand the install directory and its subdirectories, which contain the database upgrade script, and the appropriate 2.0.x_to_2.0.y.zip archive, where 2.0.x is the version of phpBB you are running. For example, if you are upgrading a phpBB 2.0.13 to version 2.0.16, you ll choose the 2.0.13_to_2.0.16.zip file. This file contains all the changes between versions 2.0.13 and 2.0.16. The upgrade to the latest version of phpBB is cumulative; therefore, it is unnecessary to install 2.0.14 and 2.0.15 to upgrade to 2.0.16 from 2.0.13, for example.

public String getContextPath()

The context path is retrieved from the PortletRequest object using the getContextPath() method. This method is analogous to the getContextPath() method on the HttpServletRequest class. Here is a very basic portlet that will display the context path for a portlet application:

If you haven t installed any modifications (discussed in detail in 11), you can safely skip this section. If you have, you must take into consideration the modifications you have installed. It is always a wise idea to check with the author s homepage or distribution site where you obtained your hacks to see if new versions are available for the upgraded version of phpBB. Although the members try to minimize disruption, sometimes the phpBB Group is forced to make a change between revisions that can have an adverse effect on an existing hack. Other times, an outdated version of a modification could introduce a security hole that the new release was supposed to fix, which would certainly be counterproductive! Fortunately, volunteers at various hack distribution points, such as phpBBHacks.com and phpBB.com, verify that the most popular modifications work with the new release within a day. Since the files in the changed files only package are clean, unmodified files, installing them directly over your modified board may produce adverse results of varying severity, depending on how many hacks you ve installed and the complexity of your hacks. You will need to reinstall any modifications you ve made to any of the changed files. If upgrades are available, reinstall the updated modification using the new files you ve just expanded.

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