Hi David.
I'd say your approach is an excellent one, and what you have done is
to "invent" for yourself (the best way to learn, in my opinion), the
concept of a "service layer object"...an object whose job it is to
orchestrate work between other objects.
I'm not sure what you mean by saying "rather than changing those cfc's
to use CS..." ... it looks to me like you ARE using CS, having defined
your beans and dependencies, then using constructor arguments to
inject them. But, in any event, I for one concur with your approach
whole-heartedly.
Doug :0)
On 4/10/07, David Farr <[EMAIL PROTECTED]> wrote:
Just starting and need some advice. I have gateway and dao cfc's for some
tables.
Rather than changing those cfc's to use CS I have
created a new cfc and injected the needed cfc's into the new cfc as shown
below. I am
thus not injecting the dependant cfc's directly into the cfc that requires
them.
Is this a reasonable approach.
<beans>
<bean id="specimenObj" class="pathTo.specimenObj">
<constructor-arg name="tblSciNameGateway">
<ref bean="tblSciNameGateway"/>
</constructor-arg>
<constructor-arg name="tblHostNameGateWay">
<ref bean="tblHostNameGateway"/>
</constructor-arg>
<constructor-arg name="tblSpecimenGateWay">
<ref bean="tblSpecimenGateWay"/> ***main table that needs the
others***
</constructor-arg>
</bean>
<bean id="tblSciNameGateWay" class="pathTo.tblSciNameGateway" />
<bean id="tblHostNameGateway"
class="pathTotblHostNameGateway" />
<bean id="tblSpecimenGateWay" class="pathTo.tblSpecimenGateWay" />
</beans>
<cfcomponent output="false">
<cffunction name="init" output="false" returntype="any">
<cfargument name="tblSpecimenGateWay"
type="pathTo.tblSpecimenGateWay" required="true">
<cfargument name="tblHostNameGateway"
type="pathTo.tblHostNameGateway" required="true">
<cfargument name="tblSciNameGateWay"
type="pathTo.tblSciNameGateWay" required="true">
<cfset variables.specimen = arguments.tblSpecimenGateWay>
<cfset variables.hostName = arguments.tblHostNameGateway>
<cfset variables.sciName = arguments.tblSciNameGateWay>
<cfset variables.currentSpecimenRec = "">
</cffunction>
<cffunction name="selectSpecimen">
<cfargument name="thisId" required="true">
<cfset var oo = variables.specimen>
<cfset var thisRec = structNew()>
<cfset variables.currentSpecimenRec =
variables.specimen.getById(#arguments.thisId#)>
<cfset thisRec.HostName = selectHostName()>
<cfset thisRec.sciName = selectSciName()>
<cfreturn thisRec>
</cffunction>
<cffunction name="selectHostName">
<cfset var xx =
variables.currentSpecimenRec.getHost()>
<cfset var yy = variables.HostName.getById(xx)>
<cfset var zz = yy.getHostName()>
<cfreturn zz>
</cffunction>
<cffunction name="selectSciName">
<cfset var xx =
variables.currentSpecimenRec.getSpecimenName()>
<cfset var yy = variables.SciName.getById(xx)>
<cfset var zz = yy.getName()>
<cfreturn zz>
</cffunction>
</cfcomponent>
David Farr
U.S. Dept. Agriculture, Agricultural Research Service
Systematic Botany and Mycology Laboratory
[EMAIL PROTECTED]
Voice: 301-504-5274
http://nt.ars-grin.gov/
