Mixins in cfcs

I have a Coldbox app and I want to inject a common set of methods into my handlers. I was thinking of using a mixin approach, and I was re-reading Sean Corfield’s post about mixins:

http://corfield.org/blog/index.cfm/do/blog.entry/entry/Mixins

I was wondering what people thought of the idea of modifying the base Component class to add the mixin function, and if this is a candidate for the kind of functionality that might be standard in a new Lucee version. Since I am only need the functionality for a subset of components, I don’t necessarily want to add the method to every component I instantiate, but the alternative is more or less to copy what Sean’s function does inline or in a base class.

Here is Sean’s function:

 function mixin(type) {
     var target = createObject("component",arguments.type);
     structAppend(this,target);
     structAppend(variables,target);
  }

I suppose I could extend coldbox.system.EventHandler to a base handler class of my own so I can add the mixin method there. I’d rather not, though. Other ideas?

Robert

You might want to take a look at “Virtual Inheritance” in Wirebox:
http://wiki.coldbox.org/wiki/WireBox.cfm#Virtual_Inheritance

I had missed this before when searching for “mixins”.

HTHOn 21 March 2015 at 08:25, Robert Munn <@Robert_Munn> wrote:

I have a Coldbox app and I want to inject a common set of methods into my
handlers. I was thinking of using a mixin approach, and I was re-reading
Sean Corfield’s post about mixins:

http://corfield.org/blog/index.cfm/do/blog.entry/entry/Mixins

I was wondering what people thought of the idea of modifying the base
Component class to add the mixin function, and if this is a candidate for
the kind of functionality that might be standard in a new Lucee version.
Since I am only need the functionality for a subset of components, I don’t
necessarily want to add the method to every component I instantiate, but
the alternative is more or less to copy what Sean’s function does inline or
in a base class.

Here is Sean’s function:

 function mixin(type) {
     var target = createObject("component",arguments.type);
     structAppend(this,target);
     structAppend(variables,target);
  }

I suppose I could extend coldbox.system.EventHandler to a base handler
class of my own so I can add the mixin method there. I’d rather not,
though. Other ideas?

Robert


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Hi Robert, you don’t need to worry about any of those online approaches.
You’re using ColdBox so we’ve already given you solutions for adding
mixins out-of-the-box :slight_smile:

Your first option is the *applicationHelper *setting (Name changed from
UDFHelper in ColdBox 3.x).

http://coldbox.ortusbooks.com/content/configuration/configuration_directives/coldbox.html

applicationHelperA list or array of absolute or relative paths to a UDF
helper file. The framework will load all the methods found in this helper
file globally. Meaning it will be injected in ALL handlers, layouts and
views.

In /config/ColdBox.cfc

coldbox={
applicationHelper = “includes/helpers/ApplicationHelper.cfm”
}

You second option is a bit more laser and allows you to add mixins on an
individual CFC basis. You can give WireBox a list of files to include UDFs
from into your components.
http://wiki.coldbox.org/wiki/WireBox.cfm#Runtime_Mixins()

If you like the WireBox DSL for mapping your components it would look like
this in your /config/WireBox.cfc:

map(“MyService”)
.to(“model.UserService”)
.mixins("/helpers/base");

My favorite WireBox approach though is to keep the config for a CFC right
there inside the component. That’s why we also have the annotation
approach for this feature:

component mixins="/helpers/base"{

}

Thanks!

~BradOn Saturday, March 21, 2015 at 3:25:48 AM UTC-5, Robert Munn wrote:

I have a Coldbox app and I want to inject a common set of methods into my
handlers. I was thinking of using a mixin approach, and I was re-reading
Sean Corfield’s post about mixins:

http://corfield.org/blog/index.cfm/do/blog.entry/entry/Mixins

I was wondering what people thought of the idea of modifying the base
Component class to add the mixin function, and if this is a candidate for
the kind of functionality that might be standard in a new Lucee version.
Since I am only need the functionality for a subset of components, I don’t
necessarily want to add the method to every component I instantiate, but
the alternative is more or less to copy what Sean’s function does inline or
in a base class.

Here is Sean’s function:

 function mixin(type) {
     var target = createObject("component",arguments.type);
     structAppend(this,target);
     structAppend(variables,target);
  }

I suppose I could extend coldbox.system.EventHandler to a base handler
class of my own so I can add the mixin method there. I’d rather not,
though. Other ideas?

Robert

Interesting, but I don’t think that approach will work in this case
because I am adding functionality to handlers, which are not listed in
Wirebox.

Handlers are managed through WireBox. Did you try any of those approaches?On 22 March 2015 at 07:22, Robert Munn <@Robert_Munn> wrote:

Interesting, but I don’t think that approach will work in this case
because I am adding functionality to handlers, which are not listed in
Wirebox.

On Mar 21, 2015, at 5:43 AM, Dominic Watson <@Dominic_Watson> wrote:

You might want to take a look at “Virtual Inheritance” in Wirebox:
http://wiki.coldbox.org/wiki/WireBox.cfm#Virtual_Inheritance

I had missed this before when searching for “mixins”.

HTH

On 21 March 2015 at 08:25, Robert Munn <@Robert_Munn> wrote:

I have a Coldbox app and I want to inject a common set of methods into my
handlers. I was thinking of using a mixin approach, and I was re-reading
Sean Corfield’s post about mixins:

http://corfield.org/blog/index.cfm/do/blog.entry/entry/Mixins

I was wondering what people thought of the idea of modifying the base
Component class to add the mixin function, and if this is a candidate for
the kind of functionality that might be standard in a new Lucee version.
Since I am only need the functionality for a subset of components, I don’t
necessarily want to add the method to every component I instantiate, but
the alternative is more or less to copy what Sean’s function does inline or
in a base class.

Here is Sean’s function:

 function mixin(type) {
     var target = createObject("component",arguments.type);
     structAppend(this,target);
     structAppend(variables,target);
  }

I suppose I could extend coldbox.system.EventHandler to a base handler
class of my own so I can add the mixin method there. I’d rather not,
though. Other ideas?

Robert


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T: +44 [0] 845 260 0726• W: www.pixl8.co.uk• E: info@pixl8.co.uk
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Interesting, but I don’t think that approach will work in this case because I am adding functionality to handlers, which are not listed in Wirebox.On Mar 21, 2015, at 5:43 AM, Dominic Watson <@Dominic_Watson> wrote:

You might want to take a look at “Virtual Inheritance” in Wirebox: http://wiki.coldbox.org/wiki/WireBox.cfm#Virtual_Inheritance

I had missed this before when searching for “mixins”.

HTH

On 21 March 2015 at 08:25, Robert Munn <@Robert_Munn> wrote:
I have a Coldbox app and I want to inject a common set of methods into my handlers. I was thinking of using a mixin approach, and I was re-reading Sean Corfield’s post about mixins:

http://corfield.org/blog/index.cfm/do/blog.entry/entry/Mixins

I was wondering what people thought of the idea of modifying the base Component class to add the mixin function, and if this is a candidate for the kind of functionality that might be standard in a new Lucee version. Since I am only need the functionality for a subset of components, I don’t necessarily want to add the method to every component I instantiate, but the alternative is more or less to copy what Sean’s function does inline or in a base class.

Here is Sean’s function:

 function mixin(type) {
     var target = createObject("component",arguments.type);
     structAppend(this,target);
     structAppend(variables,target);
  }

I suppose I could extend coldbox.system.EventHandler to a base handler class of my own so I can add the mixin method there. I’d rather not, though. Other ideas?

Robert


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Handlers are still created by WireBox. You should be able to just add the
“mixins” annotation to the CFC and it will pick it up. I think you can
also create an explicit mapping named after the handlers full path
(handlers.myHandler) but I’d need to test that real quick to confirm.

Thanks!

~Brad

ColdBox Platform Evangelist
*Ortus Solutions, Corp *

E-mail: brad@coldbox.org
ColdBox Platform: http://www.coldbox.org
Blog: http://www.codersrevolution.comOn Sun, Mar 22, 2015 at 2:22 AM, Robert Munn <@Robert_Munn> wrote:

Interesting, but I don’t think that approach will work in this case
because I am adding functionality to handlers, which are not listed in
Wirebox.

On Mar 21, 2015, at 5:43 AM, Dominic Watson <@Dominic_Watson> wrote:

You might want to take a look at “Virtual Inheritance” in Wirebox:
http://wiki.coldbox.org/wiki/WireBox.cfm#Virtual_Inheritance

I had missed this before when searching for “mixins”.

HTH

On 21 March 2015 at 08:25, Robert Munn <@Robert_Munn> wrote:

I have a Coldbox app and I want to inject a common set of methods into my
handlers. I was thinking of using a mixin approach, and I was re-reading
Sean Corfield’s post about mixins:

http://corfield.org/blog/index.cfm/do/blog.entry/entry/Mixins

I was wondering what people thought of the idea of modifying the base
Component class to add the mixin function, and if this is a candidate for
the kind of functionality that might be standard in a new Lucee version.
Since I am only need the functionality for a subset of components, I don’t
necessarily want to add the method to every component I instantiate, but
the alternative is more or less to copy what Sean’s function does inline or
in a base class.

Here is Sean’s function:

 function mixin(type) {
     var target = createObject("component",arguments.type);
     structAppend(this,target);
     structAppend(variables,target);
  }

I suppose I could extend coldbox.system.EventHandler to a base handler
class of my own so I can add the mixin method there. I’d rather not,
though. Other ideas?

Robert


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