There is a lot there, Brian. Can you clarify your questions?
DW
Brian G <mailto:[email protected]>
Thursday, July 31, 2014 2:09 PM
Guys - any thoughts on whether this will work or not?
On Wednesday, July 9, 2014 9:30:30 PM UTC-7, Brian G wrote:
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Brian G <mailto:[email protected]>
Thursday, July 10, 2014 12:30 AM
As the list may be aware, I've been struggling for some time to push
code repeatedly with zero interruptions to users while under heavy
load as we inch closer to the holy grrrrrrrrrrail of continuous
deployment. To recap, my objectives are:
* To be able to refresh the beanfactory/model (application.cs, a
model-glue parent bean factory) independent of model-glue
* To be able to refresh model-glue (including sub apps) independently
of the beanfactory
I saw something in some code from Doug Hughes which led me to
experiment today and I believe I've discovered something important and
would like to get some confirmation/feedback on the approach.
First, this is the code I saw (from
https://github.com/dhughes/ColdBooks/blob/master/Application.cfc):
<cfif structKeyExists( application, this.realName ) AND
structKeyExists( application[this.realName], "framework" ) >
<cfset
application[this.realName].framework.getBeanFactory().setParent(
application.cs ) />
</cfif>
Woah! Swapping out the parent beanfactory without deleting and
recreating Model-Glue?? Now THAT is interesting. I've always wanted
to be able to reinit my bean factory but ModelGlue always just plods
along, blissfully ignorant of my shiny new model. This code snippet
got me suspicious it might be possible. That code is pretty old (and
undocumented) MG syntax but this works in MG 3.1.299:
<cfset
application[this.realName].getInternalBeanFactory().setParent(application.cs)
/>
I can do the reverse and getParent() and (by adding in a unique value
to my application.cs) I have confirmed that it is indeed getting
updated. But here's the rub, my controllers don't pick up any of the
changes because they are autowired by Coldspring at init time so they
are holding on to references to the old model. SO, I tried three
different approaches to accessing my service layer from inside my
controllers:
1. autowire (set{beanname})
2. beans scope (defined in the modelglue.xml)
3. getModelGlue().getBean("beanname") in the controler
And after refreshing application.cs and running the setParent(), guess
what? #3 returns the updated model bean!! Unless I'm missing
something, I believe by changing all service layer references in my
controllers to use syntax #3, I can seamlessly recreate coldspring and
replace it in Model-Glue without anyone being the wiser! This almost
seems too good to be true which is why I'm writing you here:
Question: getModelGlue().getBean() appears to be deprecated in favor
of the beans scope but is it just because it's shorter to write?
Technically it's one less method call because they are cached in the
beans scope but are there any other downsides to using
getModelGlue().getBean()?
In small apps, I recognize that you can just delete the application
key for the MG app and let it re-init which would accomplish a similar
thing. However, I have a pretty massive app. Hundreds of beans in
ColdSpring and three MG apps with dozens of controllers and hundreds
of methods. Combined with Transfer, which absolutely hates restarting
under any kind of load, I'm trying to tease apart and reduce the
requirement to refresh everything all at once. Even on beefy
production hardware, my app takes 60s to reinit from coldspring to
model-glue, thus, my desire to march closer to continuous deployment
where nobody is the wiser that I'm upgrading code in real-time.
Hope this all makes sense - I'm excited in a very nerdy way tonight so
I appreciate your feedback.
Brian
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