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November 23, 2004
Reinitializing an Application Using Blackstone Events
One of the most useful tags I've ever written is the init tag. Typically, it goes in your Application.cfm file, and the body of the tag gets executed only the first time it's encountered, which means it's the perfect place to put initialization code. You can also force the body to execute again by passing a certain query string parameter in with any request. This is very useful during development when you need to flush cached components or other data.
As I started thinking more in Blackstone terms, however, I wondered what the Blackstone equivalent on the init tag would be. Of course, the init tag still works in Blackstone as does all the CFMX 6.1 code I've run so far, but I wanted to take advantage of the new event handling mechanisms available in Blackstone. So here's what I've come up with so far.
Now, I handle application initialization using the onApplicationStart event. That takes care of running the code only once (usually when the application receives its first request since the server was last started). I then added the following inside my onRequestStart event handler:
<!--- Re-initialize the application, if necessary --->
<cfif structKeyExists(url, "restart") and url.restart>
<!--- Invoke onApplicationStart event --->
</cfif>Now, when I want to invoke the onApplicationStart event, I just append a restart=true parameter to any request, and my application is reinitialized without me having to restart the server.
Posted by cantrell at November 23, 2004 1:46 PM
Comments
But how do you invoke onApplicationStart event??? By writing something like this.onApplicationStart()??
Posted by: Behrang at November 24, 2004 11:31 AM