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Dan Wilson
Dan Wilson
Model-Glue:Gesture for Fun and Profit
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So you want to create a ModelGlue:Unity application? ( Part 10 )
Sez : Dan Wilson
March 14, 2007 9:29 PM
Sean Corfield pointed out that using ColdSpring to make instance (throwaway) components is quite a heavyweight approach for a simple form bean. He is, of course, correct. Our ContactFormBean is currently created by ColdSpring. In this series, we will add a factory object that will make our instance beans for us. The factory itself will be configured through ColdSpring as well as the configuration for our objects.
This is a very simple factory. It has three methods, GetConfig, SetConfig and getBean. In turn:
- getConfig() returns a struct with keys = objectnames, and values = paths
- setConfig() provides an interface for ColdSpring to set the configuration struct.
- getBean() gets the path for a specific object from the configuration struct and returns a created object.
2
3 <!--- Author: dwilson Date: 3/14/2007 Usage: I return an instance object --->
4 <cffunction name="getBean" output="false" access="public" returntype="any" hint="I return an instance object">
5 <cfargument name="ObjectName" type="string" required="true"/>
6 <cftry>
7
8 <cfreturn createObject( "component", structFind(getConfig(), arguments.ObjectName ) ).init() />
9
10 <cfcatch type="any">
11
12 <cfthrow message="BAD_OBJECT_CONFIG_IN_INSTANCEFACTORY" detail="You provided [ #arguments.ObjectName # ] and I can't create it. Go check the config." />
13
14 </cfcatch>
15
16 </cftry>
17
18 </cffunction>
19
20 <!--- Usage: GetConfig / SetConfig methods for Config value --->
21 <cffunction name="getConfig" access="public" output="false" returntype="any">
22 <cfreturn variables.instance.Config />
23 </cffunction>
24
25 <cffunction name="setConfig" access="public" output="false" returntype="void">
26 <cfargument name="Config" type="any" required="true" />
27 <cfset variables.instance.Config = arguments.Config />
28 </cffunction>
29
30</cfcomponent>
To use this instance factory, add the following ColdSpring xml snippet to the ColdSpring.xml file.
2 <property name="Config">
3 <map>
4 <entry key="ContactFormBean"><value>ContactManagerMG.model.ContactFormBean</value></entry>
5 </map>
6 </property>
7</bean>
Now remove the original ContactFormBean configuration.
Next, open the Controller.cfc file and change each instance (getContactForm, handleContactForm and removeContact) of getModelGlue().getBean("ContactFormBean") to getModelGlue().getBean("InstanceFactory").getBean("ContactFormBean") .
Finally, reinitialize your application and click on the ContactForm tab. You should see your form as before.
A factory might seem like overkill right now, since this is a simple application. However, Factory objects are a good pattern to learn. Our motivation for the factory in this case was to reduce the amount of unnecessary processing incurred by using ColdSpring to make a simple form bean. We could however, expand our factory to take additional parameters and create all sorts of dynamic objects for us.
In a later series, we'll do just that.
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Probably the best MG tutorial i've seen, thanks for putting this together!
I was looking for a Model-Glue tutorial that approached things more clearly than the the docs that came with Model-Glue. This is exactly what I needed - thanks. I'll be posting a link to your site on my blog shortly. :)
-Nolan
Excellent series, I learnet a lot from this series, I have got one question, how can we make site SEO friendly when using this MG framework?
Thanks and continue doing good work and help the comunity.
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DK is right,those stuff is very usful.