Re: [Rails-devel] Rails 2.0: The item hierarchy

[Stefan F. <ste...@we...>]

Hi Erik,
glad to see that you like some of the refactoring goals...
I hope I will be able to make you jump boats at some point in time in 
the foreseeable future.
Stefan

On 06/30/2012 10:43 AM, Erik Vos wrote:
> Hi Stefan,
>
> This looks great.  How to find unrelated objects has been a major problem
> all the time, and your approach finally fixes that in a consistent way.
>
> I'm really looking forward to Rails 2.0!
>
> Erik.
>
>
>> -----Original Message-----
>> From: Stefan Frey [mailto:ste...@we...]
>> Sent: Saturday, June 30, 2012 7:30 AM
>> To: Development list for Rails: an 18xx game
>> Subject: [Rails-devel] Rails 2.0: The item hierarchy
>>
>> Another but hopefully the final update to the new Item hierarchy in Rails
> 2.0.
>>
>> The current iterations is simpler and closer to what we have in Rails 1.x,
> but
>> still powerful.
>>
>> An implementation is already there, but some major testing is still
> required.
>>
>> So what is the core idea?
>> One issue (especially with having more games added) is that is not easy to
>> access all objects of a Rails game from anywhere in the code. However this
> is
>> needed especially for the specialized classes that cover the (more or less
>> obscure) rules that pop up in various 18xx games: For those it cannot be
>> predicted which parts of the game might interact.
>>
>> To achieve this, every object (read: every Rails java object, which
> includes all
>> game objects) is part of a tree hierarchy: To ensure this every
> (non-utility)
>> class in Rails is derived from the Interface "Item".
>> It requires the definition of a parent (Item) and an id (String).
>>
>> To locate an item there can be special nodes defined by the Interface
>> "Context", which extends Item. Every Item gets stored inside a lookup
> table
>> of the closest Context up the tree.
>> An abstract class implementation of a Context is the "Manager".
>>
>> The top node is a special class "Root" which itself an extension of
> Manager. It
>> serves as the "Super"-Context of all Items.
>> (It might change its name into "GameManager" later, but this is already
>> used).
>>
>> A concrete example:
>> The 1830 Company "B&M" is an Item with the CompanyManager as parent,
>> which acts as the closest Context here. So one could locate B&M by asking
>> companyManager.locate("B&M").
>> Another possibility is to ask the root.locate("companies/B&M"), if
> companies
>> itself has the root as parent.
>>
>> Relation to the State mechanisms:
>> The Root itself contains a StateManager which is responsible for handling
> the
>> changes of the States (those variables which can change during the game
>> progress).
>>
>> An important feature of the object tree is that the parent/id definitions
> are
>> not states themselves (thus cannot change), however the lookup tables
>> inside the Context are States themselves and can thus change without
>> breaking the undo mechanism.
>>
>> Stefan
>>
>>
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