Modifying application variables

[gammasports]

I have multiple applications running under a single instance of CF server 8 on a J2EE box and am looking for a way to modify application scope data in one (or more) of the application(s) from within a different application (this application is a management area). Is this possible? If so, how would I reference the application scopes of each app from the outside?

[Newsgroup_User]

gammajack wrote:
> Is this possible? If so, how would I
> reference the application scopes of each app from the outside?
>

No it is not possible. You can not modify application scope from
outside a given application.

However:

You can jump in and out of different applications at any time in the
same template file by just including multiple <cfapplicaiton...> tags.

I.E.
my_management_app.cfm
---------
<h1>A bunch of application data</h1>

<cfapplication name="FooBar"...>
<h2>Foobar App</h2>
<cfdump var="#application#">

<cfapplication name="George"...>
<h2>George App</h2>
<cfdump var="#application#">

<cfapplication name="Gracie"...>
<h2>Gracie App</h2>
<cfdump var="#application#">

etc.

[gammasports]

Using your recommended code to jump around to different applications, I was able to create new application variables and change their values in one application from within a different one. I was not, however, able to change values for application variables that were already created and present in that application.

Thanks for the info. I appreciate it.

[Newsgroup_User]

You have to change back to the original application. Once you run a
<cfapplication ...> your code is completely inside the new application,
if you need to access the original you will need to run another
<cfapplication...> to re-connect to the original.

<cfapplication name="first"...>
Do stuff in the first application

<cfapplication name="second"...>
Do stuff in the second application.

<cfapplication name="first...>
Do stuff in the first application again.

[gammasports]

Yes, I've got that set up already. Thanks for following up on that last point. This is very useful. Thank you again!

[Newsgroup_User]

>> Is this possible? If so, how would I
>> reference the application scopes of each app from the outside?

> No it is not possible. You can not modify application scope from
> outside a given application.

This got me thinking.

And 30min of fiddling about yielded this proof-of-concept code:

{code}
<cfapplication name="test1">
<cfset application.test1.key = "value1">
<cfapplication name="test2">
<cfset application.test2.key = "value2">

<cfset oAppScopeTracker = createObject("java",
"coldfusion.runtime.ApplicationScopeTracker").init()>
<cfset stTemp = oAppScopeTracker.getApplicationScope('test1')>
<cfdump var="#stTemp#">
<cfset stTemp = oAppScopeTracker.getApplicationScope('test2')>
<cfdump var="#stTemp#">
<cfset stTemp.test2.key = "updated">
<cfset stTemp = oAppScopeTracker.getApplicationScope('test2')>
<cfdump var="#stTemp#">
{code}

I didn't know one could do that until now.

--
Adam

[Newsgroup_User]

Adam Cameron wrote:
>
> This got me thinking.
>

That is a interesting piece of code Adam and I will file it way for
further playing when I have some spare time.

I had another idea that I don't have time to test right now, but I will
throw it out there for somebody who may. Or maybe somebody already
knows how this would work.

I know that normally ColdFusion passes complex variables by reference.
How would this work within our multiple <application...> scenario?

I.E. Some ruff code to give an idea of where I am going with this.

<cfapplication name="one"...>
<cfset variables.appOne = application>

<cfapplication name="two"...>
<cfset variables.appTwo = application>

<cfdump var="#variables.appOne#">
<cfdump var="#variables.appTwo#">

<cfset variables.appOne.something = variables.appTwo.somethingElse>

etc.

[Newsgroup_User]

> I know that normally ColdFusion passes complex variables by reference.
> How would this work within our multiple <application...> scenario?
>
> I.E. Some ruff code to give an idea of where I am going with this.
>
> <cfapplication name="one"...>
> <cfset variables.appOne = application>
>
> <cfapplication name="two"...>
> <cfset variables.appTwo = application>
>
> <cfdump var="#variables.appOne#">
> <cfdump var="#variables.appTwo#">
>
> <cfset variables.appOne.something = variables.appTwo.somethingElse>

Yep, that works: have done it before, indeed for the very purpose the OP is
needing it for.

--
Adam