RE: [CFCDev] Singleton / Factory request

[Peter H]

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: &quot;Nando&quot; 
&lt;[EMAIL PROTECTED]&gt;<br>Reply-To: CFCDev@cfczone.org<br>To: 
&lt;CFCDev@cfczone.org&gt;<br>Subject: RE: [CFCDev] Singleton / Factory 
request<br>Date: Thu, 12 May 2005 15:51:42 +0200<br><br>&lt;cfif NOT 
StructKeyExists(application,&quot;mySingleton&quot;)&gt;<br>  &lt;cflock 
name=&quot;mySingletonLock&quot; Timeout=&quot;10&quot; 
THROWONTIMEOUT=&quot;No&quot;<br>Type=&quot;Exclusive&quot;&gt;<br>   
&lt;cfif NOT StructKeyExists(application,&quot;mySingleton&quot;)&gt;<br>    
&lt;cfset application.mySingleton 
=<br>CreateObject('component','Singleton').init(....)&gt;<br>   
&lt;/cfif&gt;<br>  &lt;/cflock&gt;<br>&lt;/cfif&gt;<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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