Thanks a lot Sean. It is just what I was looking for. However, I keep on
getting the following errormessage:
Error : Service threw an exception during method invocation: Element
EMPLOYEEGATEWAY is undefined in a Java object of type class
[Ljava.lang.String; referenced as
Just for a quick test I have put your code snippet in the Application.cfm.
Application.cfm
<cfapplication name="atlantis" clientmanagement="yes"
sessionmanagement="yes" setclientcookies="no" setdomaincookies="yes">
<cfscript>
APPLICATION.dataSource = "AtlantisDatabase";
APPLICATION.ApplicationName = "Atlantis";
</cfscript>
<cfif not structKeyExists(application,"employeeManager")>
<cflock name="#APPLICATION.ApplicationName#_employeeManager"
type="exclusive" timeout="10">
<cfif not structKeyExists(application,"employeeManager")>
<cfset employeeManager =
createObject("component","atlantis.model.employeemanager").init() />
</cfif>
</cflock>
</cfif>
And changed the employeemanager.cfc into
<cfcomponent displayname="Employee Manager" hint="I am the facade for the
Atlantis application">
<cffunction name="init" access="public" returntype="void" output="false"
displayname="Constructor">
<cfset var dsn = "#APPLICATION.DataSource#" />
<cfset VARIABLES.employeeGateway =
createObject("component","atlantis.model.employeegateway").init(dsn) />
<cfset VARIABLES.employeeDAO =
createObject("component","atlantis.model.employeedao").init(dsn) />
</cffunction>
<cffunction name="getAllEmployees" access="remote" returntype="query"
output="false" displayname="Get All Employees">
<cfreturn VARIABLES.employeeGateway.getEmployees() />
</cffunction>
</cfcomponent>
Why is the employeeGateway object not created?
Vinny
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf
Of Sean A Corfield
Sent: maandag 2 februari 2004 22:59
To: [EMAIL PROTECTED]
Subject: Re: [CFCDev] implementing Sean Corfields data access pattern
without mach-ii
On Feb 2, 2004, at 5:24 AM, Kairoh! wrote:
> What is the best way to do this configuration without using the
> mach-ii framework?
In Mach II, the configure() method is essentially what you would normally
call the init() method (the framework reserves init() for its internal use).
So, just remove extends="MachII.framework.Listener" and rename configure()
to init() - now you've got a 'regular'
(non-framework) object. Oh, and change the <cfargument> tags to reflect the
actual arguments you'll be passing in instead of the event object.
> Calling the configure method from the Flash application through Flash
> Remoting?
When you make a Flash Remoting call, the CFC is created for each call.
If you want to maintain state between calls, you need to use a session
facade or something similar. Read:
http://www.macromedia.com/devnet/mx/flashremoting/articles/facades.html
> I really like the idea behind Sean's pattern but I am not sure how to
> efficiently adapt it to a non-mach-ii scenario.
Well, it's not *my* pattern - go read the references in the front of the
Mach II Development Guide for the origins of the pattern. The pattern itself
has nothing to with Mach II and can be implemented easily in any context.
The only part of the code you are looking at that is Mach II specific in the
'manager' CFC.
Since that object is designed to work in application scope, you could use
write a CFC that is an "application facade" that you call from Flash
Remoting:
managerfacade.cfc:
<cfcomponent>
<cffunction name="getManager" access="private" ...>
<cfif not
structKeyExists(application,"articleManager")>
<!--- perform initialization --->
<cfset articleManager =
createObject("component","articlemanager").init(...) />
</cfif>
<cfreturn articleManager />
</cffunction>
<cffunction name="..." access="remote" ...>
<cfset var artMgr = getManager() />
...
</cffunction>
</cfcomponent>
The "perform initialization" code could read an XML config or whatever you
wanted to do. Oh, and you'd need locking in the getManager() method to
protect against race conditions:
<cfif not
structKeyExists(application,"articleManager")>
<cflock name="application_articleManager"
type="exclusive" ...>
<cfif not
structKeyExists(application,"articleManager")>
...
</cfif>
</cflock>
</cfif>
This if-lock-if structure ensures that no locking is used for the normal
flow of code but also protects against race conditions at startup.
Regards,
Sean
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