RE: [CFCDev] gateway CFCs

Wed, 13 Jul 2005 11:42:18 -0700

Perhaps another term, rather than gateway CFC, is CFC service. In my CFSQLTool, is a wizard called CFC Service Designer. It purpose it to construct a CFC that is used to open other CFCs. There are several reasons to use a CFC to open other CFCs. The CFC service encapsulates access to it’s worker CFCs. In the case of CFSQLTool, worker CFCs provide CRUD functions at the data access layer.  The service CFC, in turn, provides a common namespace for the invoking application.  When the application invokes the service CFC with a function call for a worker, CFC service functions initialize the worker CFCs. Another reason is that service CFC and worker CFCs can have different inherence structures.  (See: http://www.switch-box.org/images/Cfcservice.png )

 

A scenario might be a contact database with tables for contact names, addresses and phones. In application, the contact may be known as customer. One way to build the data access object is to use a service CFC invoked as customer that uses data access layer contact worker CFCs. In the application then, customer.name, can be used as a namespace. Another application may have contacts for suppliers. In this case, use a service CFC invoked as supplier that uses the same contact worker CFCs.

 

<cfcomponent

        displayname="Customer_serv"

        hint="{ts '2005-07-13 18:18:54'}; Kontact1; Objects: tAccount,tContact,tContactPhone,tContactStreetAddress" >

 

 <!--- ****************** Data Access Layer (DAL): Usually in the wrapper folder Customer.DAL. ****************** --->

 <cffunction name="init" returntype="struct" hint="Init for Customer_serv" output="no">

          <cfreturn this>

 </cffunction>

 

<!--- ************************************************************ --->

<cffunction name="SetInit" returntype="boolean" hint="SetInit for Customer_serv" output="no">

         <cfargument name="DSN" type="string" default="">

        <cfset this.DSN = Arguments.DSN >

        <cfreturn TRUE>

</cffunction>

 

<!--- ************************************************************ --->

 

<cfscript>

         Variables.Account =  "tAccount_wrap";

         Variables.Name =  "tContact_wrap";

         Variables.Phone =  "tContactPhone_wrap";

         Variables.Address =  "tContactStreetAddress_wrap";

  

</cfscript>

 

<!--- ************************************************************

            Use SetObject to instance a one of the DAL wrappers as an object.

       ************************************************************ --->

 

<cffunction name="SetObject" returntype="struct" hint="SetInit for the CFC" output="no">

       <cfargument name="obj" type="string" required="yes">

       <cfobject name="this.#Arguments.obj#" component="#Variables[Arguments.obj]#">

       <cfset this[Arguments.obj].SetInit(this.DSN)  >

       <cfreturn this[Arguments.obj]> 

</cffunction>

 

<!--- ************************************************************ 

            Use getVars to build a structure of the $ variables of a CFC object.

       ************************************************************ --->

<cffunction name="GetVars" returntype="struct" hint="Get instance vars for the CFC" output="no">

       <cfargument name="obj" type="string" required="yes">

       <cfset var keylist = StructKeyList(this[Arguments.obj])>

       <cfset var key = "" >

       <cfset var varname = StructNew() >

       <cfloop index="key" list="#keylist#">

            <cfif Mid(key, 1, 1) EQ "$" >

                 <cfset varname[key] = this[Arguments.obj][key] >

            </cfif >

       </cfloop>

       <cfreturn varname> 

</cffunction>

 

 </cfcomponent>

 

 

From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: Wednesday, July 13, 2005 7:22 AM
To: [email protected]
Subject: [CFCDev] gateway CFCs

 

What are gateway CFCs?  What’s their purpose?  What goes into a gateway CFC?  Is there a best way to construct them?

 

Thanks - Tom

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