Application architecture using AbstractGateway

[Gavin Baumanis]

Hi Everyone,

I have recently had a discussion on the CFAUSSIE mailing list about application architecture and the merit of having a service layer in addition to the data access layer.

 

The summation of that thread was that I was questioning what value the service layer provided to me, in the REAL WORLD - since whenever I used a service layer - it was 99% of the time used as a "proxy" to the data access layer.

I was hand writing all the SQL in the Gateways, and then repeating the method signatures (manually) in the service layer, as a public API.

It seemed like an awful lot of duplication to me.

 

During that discussion, Mark M. put me onto using the onMissingMethod functionality and the AbstractGateway cfc from ColdSpring.

(He was actually even nice enough to give me a hand with a sample app - BIG thanks!)

 

For thos not yet using it, the AnbstractGateway dynamically creates CRUD functions for properties in the "base" objects.

Eg. if you have a user object with XXX properties (username, password, firstname, surname.....)

Then AbstractGateway will create;

getXXX, deleteXXX, listXXX etc methods for you.

Machine generated, human-error free and repeatable.... nice!

 

 

Anyway,

I have managed to start a new application using his ideas.

Despite previously using onMissingMethod for a "trial" of SOA  - I haven't used it in anger so to speak - and it is definitely the first time I have used the AbstractGateway.cfc

 

So ultimately, I just wanted to confirm that I was doing things correctly - before I got too far into it.

As is always the case, please feel free to share any ideas / thoughts you might have.

All the code is below - And thanks!

 

 

 

So assuming that I have a User class with a dozen properties, I have the following,

 

User.cfc

----------------------

 - extends nothing,

 - contains no methods,

      - just the user properties

 

component persistent="true" table="User"  schema="dbo" output="false"
{
 /* properties */

 property name="userName" column="userName" type="string" ormtype="string" fieldtype="id";
 property name="password" column="password" type="string" ormtype="string";
 ...
} 

 

 

UserGateway.cfc

--------------------------

 - extends AbstractGateway for dynamic creation of CRUD methods

 - contains no methods

      - is an empty CFC

 

component
 extends="AbstractGateway"
 displayname="UserGateway"
 hint="I am responsible for all databaase / persistence operations for the User Class.
   I extend the AbstractGateway Class to dynamically create getter / setter methods for the User Class."
{

}

 

 

UserService.cfc

-----------------------

 - extends AbstractService.cfc

 - contains a single method for linking the gateway to the AbstractService

    - (The AbstractService contains the onMissingMethod function...)

 

component
 extends="AbstractService"
 displayname="rsUser Service Manager"
 hint="I am the Service Manager / Public API for the User Gateway class."

{
 public function init()
 {
  super.init(data=new UserGateway());
 }
}

 

 

AbstractService.cfc

------------------------------------

component
 accessors="true"
 displyname="AbstractService Class"
 hint="I am extended by other SERVICE objects so that they might inherit my onMissingMethod function"
{
 property data;

 

 public function init(data)
 {
  setData(data);
 }

 public function onMissingMethod(string missingMethodName, struct missingMethodArguments)
 {
  return evaluate("getData().#missingMethodName#(argumentCollection=missingMethodArguments)");
 }
}

 

 

 

[Mark Mandel]

Looks good to me - assuming it is doing what I think you want it to.

Ultimate question - is it working for you? :)

Mark

 

 

 

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[Tony Nelson]

Wouldn't it be better to inject a UserGateway into your UserService
rather than create one inside UserService.init()?

This is the ColdSpring user group and all...

[Mark Mandel]

Oh yeah, I missed that. +1 to what Tony said.

Mark

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[Gavin Baumanis]

Hi there,

After working in a different problem space for a little while I am back to getting on with the new part of our application.

The code in the CFCs, hasn't changed, though we have rearchitected the application since I was last here talking about it.

(So I "do" assume it is something that we have done)

None the less I have come across an error that doesn't appear via a Google search or a group search, so I figured I would ask for some help - and hope that it is something silly....

Anyway, when creating a Service - using;

<cfset testService = createObject("component", "com.cogstate.qms.dcTestService").init() />

<cfdump var="#testService#" />

 I now get the following ;

Detail	[empty string]
ErrNumber	0
Message	Element SINGLETON.INSTANCE is undefined in a Java object of type class coldfusion.runtime.AttributeCollection referenced as ''
Resolvedname	[empty string]
StackTrace	coldfusion.runtime.UndefinedElementException: Element SINGLETON.INSTANCE is undefined in a Java object of type class coldfusion.runtime.AttributeCollection referenced as '' at coldfusion.runtime.DotResolver.resolveSplitNameInMap(DotResolver.java:109) at coldfusion.runtime.CfJspPage._resolve(CfJspPage.java:1578) at coldfusion.runtime.CfJspPage._resolveAndAutoscalarize(CfJspPage.java:1796) at coldfusion.runtime.CfJspPage._resolveAndAutoscalarize(CfJspPage.java:1788) at cfAbstractGateway2ecfc347768562$funcINIT.runFunction(C:\DataPoint\com\coldspring\orm\hibernate\AbstractGateway.cfc:51) at coldfusion.runtime.UDFMethod.invoke(UDFMethod.java:472) at coldfusion.runtime.UDFMethod$ReturnTypeFilter.invoke(UDFMethod.java:405) at coldfusion.runtime.UDFMethod$ArgumentCollectionFilter.invoke(UDFMethod.java:368) at coldfusion.filter.FunctionAccessFilter.invoke(FunctionAccessFilter.java:55) at coldfusion.runtime.UDFMethod.runFilterChain(UDFMethod.java:321) at coldfusion.runtime.UDFMethod.invoke(UDFMethod.java:220) at coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:654) at coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:443) at coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:413) at coldfusion.runtime.CFPage.___createObjectInternal(CFPage.java:10266) at coldfusion.runtime.CFPage._createObject(CFPage.java:10232) at cfdcTestService2ecfc608659344$funcINIT.runFunction(C:\DataPoint\com\cogstate\qms\dcTestService.cfc:27) at coldfusion.runtime.UDFMethod.invoke(UDFMethod.java:472) at coldfusion.runtime.UDFMethod$ArgumentCollectionFilter.invoke(UDFMethod.java:368) at coldfusion.filter.FunctionAccessFilter.invoke(FunctionAccessFilter.java:55) at coldfusion.runtime.UDFMethod.runFilterChain(UDFMethod.java:321) at coldfusion.runtime.UDFMethod.invoke(UDFMethod.java:220) at coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:654) at coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:443) at coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:413) at coldfusion.runtime.CfJspPage._invoke(CfJspPage.java:2431) at cfscribble2ecfm1191294066.runPage(C:\DataPoint\www\scribble.cfm:12) at coldfusion.runtime.CfJspPage.invoke(CfJspPage.java:235) at coldfusion.tagext.lang.IncludeTag.doStartTag(IncludeTag.java:429) at coldfusion.runtime.CfJspPage._emptyTcfTag(CfJspPage.java:2798) at cfapplication2ecfc1007700339$funcONREQUEST.runFunction(C:\DataPoint\www\application.cfc:145) at coldfusion.runtime.UDFMethod.invoke(UDFMethod.java:472) at coldfusion.runtime.UDFMethod$ReturnTypeFilter.invoke(UDFMethod.java:405) at coldfusion.runtime.UDFMethod$ArgumentCollectionFilter.invoke(UDFMethod.java:368) at coldfusion.filter.FunctionAccessFilter.invoke(FunctionAccessFilter.java:55) at coldfusion.runtime.UDFMethod.runFilterChain(UDFMethod.java:321) at coldfusion.runtime.UDFMethod.invoke(UDFMethod.java:220) at coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:654) at coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:443) at coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:413) at coldfusion.runtime.AppEventInvoker.invoke(AppEventInvoker.java:104) at coldfusion.runtime.AppEventInvoker.onRequest(AppEventInvoker.java:296) at coldfusion.filter.ApplicationFilter.invoke(ApplicationFilter.java:406) at coldfusion.filter.RequestMonitorFilter.invoke(RequestMonitorFilter.java:48) at coldfusion.filter.MonitoringFilter.invoke(MonitoringFilter.java:40) at coldfusion.filter.PathFilter.invoke(PathFilter.java:112) at coldfusion.filter.LicenseFilter.invoke(LicenseFilter.java:30) at coldfusion.filter.ExceptionFilter.invoke(ExceptionFilter.java:75) at coldfusion.filter.BrowserDebugFilter.invoke(BrowserDebugFilter.java:79) at coldfusion.filter.ClientScopePersistenceFilter.invoke(ClientScopePersistenceFilter.java:28) at coldfusion.filter.BrowserFilter.invoke(BrowserFilter.java:38) at coldfusion.filter.NoCacheFilter.invoke(NoCacheFilter.java:46) at coldfusion.filter.GlobalsFilter.invoke(GlobalsFilter.java:38) at coldfusion.filter.DatasourceFilter.invoke(DatasourceFilter.java:22) at coldfusion.filter.CachingFilter.invoke(CachingFilter.java:62) at coldfusion.CfmServlet.service(CfmServlet.java:204) at coldfusion.bootstrap.BootstrapServlet.service(BootstrapServlet.java:89) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at coldfusion.monitor.event.MonitoringServletFilter.doFilter(MonitoringServletFilter.java:42) at coldfusion.bootstrap.BootstrapFilter.doFilter(BootstrapFilter.java:46) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:928) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:414) at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:203) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:539) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:298) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662)
TagContext	array 1 struct COLUMN 0 ID CF_DOTRESOLVER LINE 51 RAW_TRACE at cfAbstractGateway2ecfc347768562$funcINIT.runFunction(C:\DataPoint\com\coldspring\orm\hibernate\AbstractGateway.cfc:51) TEMPLATE C:\DataPoint\com\coldspring\orm\hibernate\AbstractGateway.cfc TYPE CFML 2 struct COLUMN 0 ID CF_CFPAGE LINE 27 RAW_TRACE at cfdcTestService2ecfc608659344$funcINIT.runFunction(C:\DataPoint\com\cogstate\qms\dcTestService.cfc:27) TEMPLATE C:\DataPoint\com\cogstate\qms\dcTestService.cfc TYPE CFML 3 struct COLUMN 0 ID CF_TEMPLATEPROXY LINE 12 RAW_TRACE at cfscribble2ecfm1191294066.runPage(C:\DataPoint\www\scribble.cfm:12) TEMPLATE C:\DataPoint\www\scribble.cfm TYPE CFML 4 struct COLUMN 0 ID CFINCLUDE LINE 145 RAW_TRACE at cfapplication2ecfc1007700339$funcONREQUEST.runFunction(C:\DataPoint\www\application.cfc:145) TEMPLATE C:\DataPoint\www\application.cfc TYPE CFML

To try and help a little, here is the code of relevance;

scribble.cfm @12

<cfset testService = createObject("component", "com.cogstate.qms.dcTestService").init() />

dcTestService.cfc

component

extends="com.cogstate.AbstractService"

displayname="dcTest Service Manager"

hint="I am the Service Manager / Public API for the dcTest Gateway class."

{

public function init()

{

super.init(data=new dcTestGateway());

}

}

dcTestGateway.cfc

component

extends="com.coldspring.orm.hibernate.AbstractGateway"

displayname="dcTestGateway"

hint="I am responsible for all databaase / persistence operations for the dcTest Class.

I extend the AbstractGateway Class to dynamically create getter / setter methods for the dcTest Class."

{

}

dcTest.cfc

Has no methods, only properties.

If anyone has any ideas component

extends="com.cogstate.AbstractService"

displayname="dcTest Service Manager"

hint="I am the Service Manager / Public API for the dcTest Gateway class."

{

public function init()

{

super.init(data=new dcTestGateway());

}

}

As always - thanks in advance for any help!

[Mark Mandel]

Have you got an instance of ColdSpring running?

Mark

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[Gavin Baumanis]

As always - thanks Mark, I knew it was going to be something simple!

The code to instantiate CS, wasn't committed when I was "playing" around earlier - and as a result of the application rearchitecture, I checked out an entirely new working copy - certain that I would remember all the local changes...!

Just while I think of it, Any chance of a better error message?

Thanks again!

[Gavin Baumanis]

HI Everyone,

I need to reopen this thread as I am still having an error that I can;t seem to solve for myself.

I still have the AbstractService, AbstractGateway and the specific object service layer classes.

AbstractService

--------------------

component

accessors = "true"

displayname = "AbstractService Class"

hint = "I am extended by other SERVICE objects so that they might inherit my onMissingMethod function"

{

property data;

public function init(data)

{

setData(data);

}

public function onMissingMethod(string missingMethodName, struct missingMethodArguments)

{

return evaluate("getData().#missingMethodName#(argumentCollection=missingMethodArguments)");

}

}

commentsService

-----------------------

component

extends = "com.myProject.AbstractService"

displayname = "Comments Service Manager"

hint = "I am the Service Manager / Public API for the CommentsGateway class."

{

public function init()

{

super.init(data=new CommentsGateway());

return this;

}

}

I have a very simple "junk" template that I am trying to run - but it is producing a weird error for me.

The code and the error follows.

Hopefully, I am just missing something really simple  - but i'll be damned if I can work it out for myself.

Index.cfm

-------------

<cfscript>

    CommentsServiceCFC= createObject("component", "com.projectDir.Comments.CommentsService");

    myNewComment = CommentsServiceCFC.getComments();

</cfscript>


Error;

Type	java.lang.NullPointerException

array
1	struct COLUMN 0 ID ?? LINE 1 RAW_TRACE at Statement27.evaluate(<generated>:1) TEMPLATE <generated> TYPE CFML
2

struct COLUMN 0 ID CF_CFPAGE

LINE 69 RAW_TRACE at cfAbstractService2ecfc55306172$funcONMISSINGMETHOD.runFunction(C:\inetpub\wwwroot\projectDir\trunk\com\projectDir\AbstractService.cfc:69) TEMPLATE C:\inetpub\wwwroot\projectDir\trunk\com\projectDir\AbstractService.cfc TYPE CFML
3

struct COLUMN 0 ID CF_TEMPLATEPROXY

LINE 48 RAW_TRACE at cfindex2ecfm1327402007.runPage(C:\inetpub\wwwroot\projectDir\trunk\index.cfm:48) TEMPLATE C:\inetpub\wwwroot\projectDir\trunk\index.cfm TYPE CFML
4

struct COLUMN 0 ID CFINCLUDE

LINE 266 RAW_TRACE at cfApplication2ecfc498167235$funcONREQUEST.runFunction(C:\inetpub\wwwroot\projectDir\trunk\Application.cfc:266) TEMPLATE C:\inetpub\wwwroot\projectDir\trunk\Application.cfc TYPE CFML

As is always the case - a very big thanks !

Gavin.

[Tony Nelson]

I don't think createObject() calls init() by default. Try changing your code to:

CommentsServiceCFC = new com.projectDir.Comments.CommentsService();

[Gavin Baumanis]

Hi Tony,

Thanks! 

Slight;y embarrassing - in the sense that I recently gave a presentation / code review of the new architecture that I am using to the rest of the IT team and specifically mentioned to everyone exactly your point!

Thanks again!

Gavin.