RE: [CFCDev] Singleton / Factory request

Peter H Thu, 12 May 2005 10:00:06 -0700

Kerry,

Thanks for that, it took a few minutes of staring blankly but I clicked what you were saying in the end.

Cheers, Pete (aka lad4bear)

----Original Message Follows---- From: "Kerry" <[EMAIL PROTECTED]> Reply-To: [email protected] To: <[email protected]> Subject: RE: [CFCDev] Singleton / Factory request Date: Thu, 12 May 2005 17:15:50 +0100 >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:  <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: [email protected] 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  <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> ----Original Message Follows---- From: &quot;Nando&quot; &lt;[EMAIL PROTECTED]&gt; Reply-To: [email protected] To: &lt;[email protected]&gt; Subject: RE: [CFCDev] Singleton / Factory request Date: Thu, 12 May 2005 15:51:42 +0200 &lt;cfif NOT StructKeyExists(application,&quot;mySingleton&quot;)&gt; &lt;cflock name=&quot;mySingletonLock&quot; Timeout=&quot;10&quot; THROWONTIMEOUT=&quot;No&quot; Type=&quot;Exclusive&quot;&gt; &lt;cfif NOT StructKeyExists(application,&quot;mySingleton&quot;)&gt; &lt;cfset application.mySingleton = CreateObject('component','Singleton').init(....)&gt; &lt;/cfif&gt; &lt;/cflock&gt; &lt;/cfif&gt; Does that help? The lock is necessary to be absolutely sure, because there's a very small time lag between the moment a request passes thru the first cfif and the moment application.mySingleton is created. n. :) -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Peter H Sent: Thursday, May 12, 2005 3:16 PM To: [email protected] Subject: [CFCDev] Singleton / Factory request Hi guys, I'm trying to build a Singleton / Factory but seemed to have got myself a little tangled up. Here's what I'm trying to do. 1) Have a factory component that is responsible for creating all of my other components by name. 2) Make this factory a singleton so that it's only created once and stored in application scope. I've heard people talk about this on the board and was hoping someone would post be able to post some code for me to look at. Cheers, Pete (aka lad4bear) ---------------------------------------------------------- You are subscribed to cfcdev. 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RE: [CFCDev] Singleton / Factory request

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