>Any comments appreciated.
Why does the factory manager go back out of itself to application scope,
when it itself is already a singleton in application scope?
You could change to:
<!--- Instantiate ComponentManager --->
<cfif not StructKeyExists(Application, 'ComponentFactoryManager') >
<cflock name="LoadComponentFactoryManager" timeout="10"
type="exclusive">
<cfif not structKeyExists( Application,
'ComponentFactoryManager' )>
<cfset Application.ComponentFactoryManager =
CreateObject('Component',
'Components.ComponentFactoryManager') />
<cfset Application.ComponentFactoryManager.init()>
</cfif>
</cflock>
</cfif>
In ComponentFactoryManager <<singleton>>
<cfcomponent displayname="ComponentFactoryManager">
<cffunction name="init">
<cfset variables.instance = structnew()>
<cfset variables.instance.ComponentFactory =
CreateObject('Component',
'Components.ComponentFactory') />
</cffunction>
<cffunction name="Instance" access="public" returntype="any"
output="false"
>
<cfreturn variables.instance.ComponentFactory />
</cffunction>
</cfcomponent>
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Behalf Of Peter H
Sent: 12 May 2005 16:39
To: CFCDev@cfczone.org
Subject: RE: [CFCDev] Singleton / Factory request
Thanks Nando,
I've ended up seperating the Singleton from the factory. Not sure if its the
best way though. Any comments appreciated.
Cheers, Pete (aka lad4bear)
In Application.cfc
<!--- Instantiate ComponentManager --->
<cfif not StructKeyExists(Application, 'ComponentFactoryManager') >
<cflock name="LoadComponentFactoryManager" timeout="10"
type="exclusive">
<cfif not structKeyExists( Application,
'ComponentFactoryManager' )>
<cfset Application.ComponentFactoryManager =
CreateObject('Component',
'Components.ComponentFactoryManager') />
</cfif>
</cflock>
</cfif>
In ComponentFactoryManager <<singleton>>
<cfcomponent displayname="ComponentFactoryManager">
<cffunction name="Instance" access="public" returntype="any"
output="false"
>
<cfif not StructKeyExists(Application, 'ComponentFactory') >
<cflock name="LoadComponentFactory" timeout="10"
type="exclusive">
<cfif not structKeyExists( Application,
'ComponentFactory' )>
<cfset Application.ComponentFactory =
CreateObject('Component',
'Components.ComponentFactory') />
</cfif>
</cflock>
</cfif>
<cfreturn Application.ComponentFactory />
</cffunction>
</cfcomponent>
In ComponentFactory <<factory >>
<cfcomponent displayname="ComponentFactory" hint="">
<cffunction name="Create" access="public" returntype="any"
output="false" >
<cfargument name="ComponentType" type="string" required="true">
<cfset var component = 0 />
<cfswitch expression="#arguments.ComponentType#">
<cfcase value="PingRequest">
<cfset component = CreateObject('Component',
'Components.PingRequest').Init() />
</cfcase>
<cfcase value="OptionRequest">
<cfset component = CreateObject('Component',
'Components.OptionRequest').Init() />
</cfcase>
</cfswitch>
<cfreturn component />
</cffunction>
</cfcomponent>
<br><br><br>----Original Message Follows----<br>From: "Nando"
<[EMAIL PROTECTED]><br>Reply-To: CFCDev@cfczone.org<br>To:
<CFCDev@cfczone.org><br>Subject: RE: [CFCDev] Singleton / Factory
request<br>Date: Thu, 12 May 2005 15:51:42 +0200<br><br><cfif NOT
StructKeyExists(application,"mySingleton")><br> <cflock
name="mySingletonLock" Timeout="10"
THROWONTIMEOUT="No"<br>Type="Exclusive"><br>
<cfif NOT StructKeyExists(application,"mySingleton")><br>
<cfset application.mySingleton
=<br>CreateObject('component','Singleton').init(....)><br>
</cfif><br> </cflock><br></cfif><br><br>Does that help?
The lock is necessary to be absolutely sure, because there's<br>a very small
time lag between the moment a request passes thru the first<br>cfif and the
moment application.mySingleton is created.<br><br>n. :)<br> -----Original
Message-----<br> From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf<br>Of Peter H<br> Sent:
Thursday, May 12, 2005 3:16 PM<br> To: CFCDev@cfczone.org<br> Subject:
[CFCDev] Singleton / Factory request<br><br><br> Hi guys,<br><br> I'm
trying to build a Singleton / Factory but seemed to have got myself
a<br>little tangled up. Here's what I'm trying to do.<br><br> 1) Have a
factory component that is responsible for creating all of my<br>other
components by name.<br><br> 2) Make this factory a singleton so that it's
only created once and stored<br>in application scope.<br><br> I've heard
people talk about this on the board and was hoping someone<br>would post be
able to post some code for me to look at.<br><br> Cheers, Pete (aka
lad4bear)<br>
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CFCDev is supported by New Atlanta, makers of BlueDragon
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An archive of the CFCDev list is available at
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CFCDev is run by CFCZone (www.cfczone.org) and supported by CFXHosting
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CFCDev is supported by New Atlanta, makers of BlueDragon
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