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At some point you may want to make a plug-in with deeper hooks into more than one part of the Catalyst request cycle. Catalyst::Plugin::Static::Simple is the grandfather of these types of plug-ins, and it has uses both in development and in production. Mostly, you ll want to use Catalyst::Plugin::Static::Simple during development to avoid using the Catalyst dispatcher to process requests that will hit a static file, and just serve them directly. To this end, it overrides the following methods from Catalyst.pm: setup: This code runs when your application is first set up. For this plug-in, all that happens is the configuration hash is obtained using Catalyst s existing infrastructure, and defaults are set, so you know what paths and file extensions correspond to static files and what their MIME type should be. prepare_action: This method checks if $c->req->path actually points to a static file and sets the response status to 404 and a Page not found message if it s a path covered under config but the file requested is not present. In versions of Static::Simple prior to 0.12, processing of the rest of the request would be short-circuited here, but this caused problems with other plug-ins that intercepted the prepare_action, so this is no longer the case. dispatch: Here the plug-in sets the (hopefully) correct MIME-type header for the static file to be served and sets the response body. finalize: This is where logging specific to Static::Simple s functionality is performed after the static file has been sent to the client.

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You can scroll through the list, or use the empty text field to look up entries. Entering characters in this field triggers the list box to jump to the first best match by comparing volumes with text in the field. Edit: Entries in the Volume key, Volume, and Directory text fields are determined by the directory selected from the list box. These fields are populated when you highlight a directory. Volume key: Opticon assigns a numeric value to each directory. This value is a system field, and you can t edit it directly. Therefore, this text field is locked. Volume: The volume associated with a directory. Recall that a volume refers to the media on which images were stored when provided to a Concordance administrator. As a result, many directories can share the same volume. In the example displayed in Figure 13-16, three directories share the same volume: DVD001. Directory: The directory associated with a set of images. Data in this field is associated with the current directory highlighted in the list. Note that entries under the Directory label in the list represent the lowest subordinate folders in which images are stored. For example, say a volume contains a root folder DVD001 and three subordinate folders 001, 002, and 003. Images are contained in folders DVD001\001\, DVD001\002\, and DVD001\003\. The list will contain three separate images (see Figure 13-16). Save: When you update an entry for a directory, you must click the Save button before selecting another item in the list. Unsaved data is lost when you select a new directory.

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One possible exercise to do for practicing writing plug-ins is to add functionality that does the display of directories for paths under Static::Simple s control, much in the same way that a real web server can do.

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Figure 13-16. An example of volume and directory entries in the Directory tab s list Search and replace: You can globally update directory information. This feature is useful when a server name or drive mapping changes. Changes made to directory information using this feature are permanent, and cannot be undone. Target: The text that will be replaced. Replacement: The text used to overwrite text specified in the Target field. Replace: Clicking the Replace button triggers the search and replace procedure. A status bar under this button displays the procedure s progress.

We mentioned Catalyst::Plugin::Server and its close relative Catalyst::Plugin::Server::XMLRPC in the previous chapter. We have another opportunity to mention it here. Should you find the need to make deep changes to Catalyst s internals, such as having different dispatch rules (e.g., from parsing XML data in the request body for XML-RPC, or JSON data in the request body for JSON-RPC), then you will need to intercept the prepare_action method. Doing so will defer to a new dispatch type (Catalyst::Plugin::Server::XMLRPC::DispatchType::XMLRPCPath, in this case). This means that our code no longer uses $c->req->path and $c->req->args to determine how Catalyst actions are called. It parses information from XML in the request body instead. Once you re in this deep as far as extending Catalyst goes, the work becomes very detailed and requires substantial knowledge of Catalyst s internals. However, the techniques are the same as detailed previously. Moose, Moose::Role, and MRO::Compat (and Class::C3, where all the things like $self->next::method(@_) are documented) are your primary tools. The challenging part of this job is understanding the anatomy of your problem (remember the surgeon analogy from the start of the chapter) or the way the pipes are laid out for this particular building (recall the plumbing analogy). Extending Catalyst in this detailed fashion is an excellent way to understand Catalyst and, to a lesser extent, Perl s internal workings, more thoroughly.

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Summary