[Rock-dev] Proposed solutions (so far) to the property settings pitfalls

[Christopher Gaudig]

I kinda like 0 and 1.
2 is acceptable, 3 is my least favorite, but then I don't use ruby a lot.

Christopher



On 02/07/2011 06:51 PM, Jakob Schwendner wrote:
> On 02/07/2011 06:48 PM, Sylvain Joyeux wrote:
>> The problem
>> ===========
>>
>>       task.config.value = 10
>>
>> does *not* change the field "value" of property "config" on the task.
>> One has to do
>>
>>       p = task.config
>>       p.value = 10
>>       task.config = p
>>
>> Proposed solutions
>> ==================
>> 0. make task.config.value = 10 transfer the updated property to the
>>       remote task
>> 1. leaving it as it is
>> 2. require people to use read/write (or get/set) methods to read and
>>       write the properties. For instance, it could look like
>>
>>       p = task.read_config
>>       p.value = 10
>>       task.write_config(p)
>>
>> 3. make the returned values read-only and allow to provide a
>>       block to update
>>
>>       task.config.value = 10 # will raise an exception
>>
>>       # The following works
>>       p = task.config.dup
>>       p.value = 10
>>       task.config = p
>>
>>       # and it is equivalent to
>>       task.config do |p|
>>          p.value = 10
>>       end # the property gets written at the end of the block
>>
>> Thoughts ?
>>
>>
>> I personally don't like 0 as it involves having partial changes to the
>> configuration data structures (which might be very bad if the component
>> is currently running).
> I like 3. Wouldn't mind 0 from an API point of view (most intuitive).
> Dislike 2.
>
> Jakob
>
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-- 
Christopher Gaudig
Underwater & Space Robotics

DFKI GmbH
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