I just got the following advice in a HostMySite CF newsletter. Is there an
issue with session scopes in custom tags? I've received other coding "tips"
from them that make no sense or is just plain bad advice but not sure what
to make of this.
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Coding Tip
Discover methods used by HostMySite's CFMX gurus to address your common
coding and performance issues. Stop by the Developers' Forum to discuss with
fellow ColdFusion users.
Duplicate Your Session Scopes to Relieving Memory Issues
When you use custom tags to place exclusive locks around the session scope,
it causes ColdFusion service issues, which affects all users within a shared
environment. You can prevent these ColdFusion service issues by using a
common fix we use to fine tune our code:
Use a variable scope to remove the memory being used by the session scope
once the tag has completed it's necessary action.
<cflock timeout="45" throwontimeout="Yes" type="READONLY" scope="SESSION">
<CFSET variables.LSess=Duplicate(session)>
</cflock>
We would be replacing all references of session to variables.LSess and
copying the local copy of the structure back to the session scope.
<cflock timeout="45" throwontimeout="Yes" type="EXCLUSIVE" scope="SESSION">
<CFSET session=Duplicate(variables.LSess)>
</cflock>
If you have difficulty copying over structures in your local version to the
session scope, you can duplicate each key under the local session structure
over to the scope. Your final code would look similar to:
<cflock timeout="45" throwontimeout="Yes" type="EXCLUSIVE" scope="SESSION">
<CFLOOP index="Key" list=#StructKeyList(variables.LSess)#>
<CFSET "Session.#Key#"=Duplicate(Evaluate(" variables.LSess.#Key#"))>
</CFLOOP>
</cflock>
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