Hi James
I got this question after watching the David Nolen's video called "The
Functional Final Frontier
<https://www.youtube.com/watch?v=DMtwq3QtddY&feature=youtu.be&t=663>".
Around minute 11th he talked about "Local state is poison
<https://awelonblue.wordpress.com/2012/10/21/local-state-is-poison/>" idea
and how he tried (using cursors) to remove this local state from Om design
After those David Nolen design ideas, it seems to me that
stuartsierra/component is inclined on local state ("Managed lifecycle of
stateful objects in Clojure") more than global tree structure state...
Thanks for your clarification!
Juan
2015-04-29 16:38 GMT+02:00 James Reeves <ja...@booleanknot.com>:
> Often because components contain some form of data. For instance, a
> component that handles database connection may have a database connection
> instance.
>
> Reify produces objects that are essentially opaque, which is fine if you
> just want their behaviour, as in the case of Om, but not so good if you
> also want to carry around some form of data.
>
> Records are even useful for components that aren't usually dependencies,
> like a web server. Even though you may only need to start and stop the
> server component, it's often useful for debugging or monitoring purposes to
> be able to query the options that the server was set up with.
>
> - James
>
> On 29 April 2015 at 14:41, Juan A. Ruz @tangrammer <
> juanantonio...@gmail.com> wrote:
>
>> Hi guys,
>> I'm just wondering the pros/contras that justify to choose defrecord vs
>> reify as component fn constructor.
>>
>> in the component README we can read
>> "To create a component, define a Clojure record that implements the
>> Lifecycle protocol."
>>
>> Yes I know that "defrecord creates an immutable persistent map which
>> implements a protocol." but I think that the same thing can be achieved
>> with reify (BTW: "om" way to define component) over a persistent map...
>>
>> Do you think there are more reasons to set defrecord as default base fn
>> for components?
>>
>> Thanks in advance
>> Juan
>>
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