Does exclusive cflockings of the application scope prevent to access the scope
from *everywhere*?
Sample code:
----------
Application.cfm:
<cfif not structKeyExists(application, "properties") or not
structKeyExists(application, "components")>
<cflock scope="application" timeout="20" type="exclusive">
<cfset application.properties = structNew() />
<cfset application.components = structNew() />
</cflock>
</cfif>
<cfif structKeyExists(url,"reload")>
<cflock scope="application" timeout="20" type="exclusive">
<cfset application.properties.dsn = "dsn" />
<cfset application.properties.attachmentsRoot = expandPath("../") />
<cfset application.properties.uploadRoot = expandPath("assets") />
<cfloop collection="application.components" item="comp">
<cfinvoke component="#application.components[comp]#"
method="setReloadFlag" value="true" />
</cfloop>
</cflock>
</cfif>
---------
---------
atemplate.cfm:
<cfif not structKeyExists(application.components, "productDAO") or
application.components.productDAO.getReloadFlag()>
<cflock scope="application" timeout="20" type="exclusive">
<cfset application.components.productDAO =
createObject("component","com.site.product.productdao").init(application.properties.dsn)
/>
</cflock>
</cfif>
<cfset abean = createObject("component","abean") />
<cfset application.components.productdao.read(abean, id) />
----------
-----------
anothertemplate.cfm:
<cfif not structKeyExists(application.components, "productGateway") or
application.components.productGateway.getReloadFlag()>
<cflock scope="application" timeout="20" type="exclusive">
<cfset application.components.productGateway =
createObject("component","com.site.product.productGateway").init(application.properties.dsn)
/>
</cflock>
</cfif>
<cfset aquery=application.components.productGateway.getAllProducts() />
<cfset aquery=application.components.productGateway.getProductsByName() />
------------
I'm not sure whether there are any problems or not under race conditions with
the sample code. Especially I wonder about the issues with two or more
exclusive cflocks for application scope. Those locks are treated as a
single-lock or not? Do you see any problem with the sample code?
Murat.
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