Groups > comp.lang.java.programmer > #26339

Re: Java EE Architecture

Date	2013-10-16 16:44 +0100
From	lipska the kat <"nospam at neversurrender dot co dot uk">
Organization	Trollbusters 3
Newsgroups	comp.lang.java.programmer
Subject	Re: Java EE Architecture
References	(3 earlier) <0672ja-utj.ln1@tempest.fredriksson.dy.fi> <daadnWh395wh7cPPnZ2dnUVZ8hSdnZ2d@bt.com> <ml92ja-afn.ln1@tempest.fredriksson.dy.fi> <Hc6dnXuEVfLDDsPPnZ2dnUVZ8rydnZ2d@bt.com> <pbj2ja-v35.ln1@tempest.fredriksson.dy.fi>
Message-ID	<IvqdnWuRar_hKcPPnZ2dnUVZ8umdnZ2d@bt.com> (permalink)

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On 16/10/13 15:10, Donkey Hottie wrote:
> 16.10.2013 16:23, lipska the kat kirjoitti:
>> On 16/10/13 12:25, Donkey Hottie wrote:
>>> 16.10.2013 13:55, lipska the kat kirjoitti:
>>
>> <snip>
>>
>>> We are managing the personnel of a company. A manager manager persons,
>>> not identities.
>>>
>>> A computer system is not supposed to model the liver or a soul of a
>>> Person, but abstracts the properties that are relevant to the task.
>>
>> Well you said it.
>>
>>> A Person has a manager. An Identity does not.
>>
>> My local health service no longer calls people 'patients'. People who
>> use the services are called unsurprisingly 'service users'
>>
>> While I abhor the impersonal overtones of this particular bit management
>> speak it makes perfect sense in terms of describing the entity concerned.
>>
>> In the case you quote surely a manager manages Employees
>>
>> or
>>
>> An Employee *has a* Manager
>> A Manager manages one or more Employees
>> An Employee has one or more Roles
>> An Employee has an Identity (or many if you insist)
>> A Manager *is an* Employee
>> etc etc
>>
>> No mention anywhere of the class *Person*
>>
>> You state
>>
>> 'A Person may have more than one Identities' (sic)
>>
>> I'd prefer 'An Employee can have one or more Roles/Identities'
>>
>> A person with multiple identities doesn't really make sense does it?
>>
>> How do you identify someone with multiple identities???
>>
>>
>>
>
> Indeed i our model a Person can have at most one identity. I remembered
> wrong.
>
>
> But then the Employee. And a Manager? (We do not have a Manager, but
> Person has a property isManager).
>
> A Person may be a Manager, AND is an Employee as well. Your model does
> not work.

I think it does, read again, I said

An Employee *has a* Manager
A Manager *is an* Employee

> He has an Identity, and multiple User Accounts. He is a
> Person. Not an Employee. He may be an Employee, but the Owner of the
> business is no such. A Person is a generalization of these, no need to
> make the model too keen on details, too complicated. Or do we need a
> Boss class too?

Well in the first place Owner and Boss are two different concepts, in 
any case either the boss or the owner or both if they are different 
probably works for the company (even if he owns it, someone/thing has to 
pay him) in which case he/she is an Employee.

Don't forget, legally, here at least in the UK a (limited) company is a 
legal entity in it's own right, the company pays the wages, not the 
owner/boss/whoever ...

... and are you really saying that you need Person as a generalization 
because the Boss is not an Employee ... not much of a reason is it?

You say you are managing the personnel of a Company. What other types of 
personnel are there apart from Employees.

-- 
Lipska the Kat©: Troll hunter, sandbox destroyer
and farscape dreamer of Aeryn Sun
GNU/Linux user #560883 - http://www.linuxcounter.net

Thread

Java EE Architecture art.marole@gmail.com - 2013-10-09 13:41 -0700
  Re: Java EE Architecture Lew <lewbloch@gmail.com> - 2013-10-09 14:45 -0700
    Re: Java EE Architecture Arne Vajhøj <arne@vajhoej.dk> - 2013-10-09 22:00 -0400
  Re: Java EE Architecture Arne Vajhøj <arne@vajhoej.dk> - 2013-10-09 22:18 -0400
    Re: Java EE Architecture art.marole@gmail.com - 2013-10-10 00:47 -0700
      Re: Java EE Architecture Arne Vajhøj <arne@vajhoej.dk> - 2013-10-16 20:37 -0400
  Re: Java EE Architecture lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-10-10 13:26 +0100
    Re: Java EE Architecture 1connu <1connu999@gmail.com> - 2013-10-16 10:45 +0200
      Re: Java EE Architecture Donkey Hottie <donkey@fredriksson.dy.fi> - 2013-10-16 13:42 +0300
        Re: Java EE Architecture lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-10-16 11:55 +0100
          Re: Java EE Architecture Donkey Hottie <donkey@fredriksson.dy.fi> - 2013-10-16 14:18 +0300
          Re: Java EE Architecture Donkey Hottie <donkey@fredriksson.dy.fi> - 2013-10-16 14:25 +0300
            Re: Java EE Architecture lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-10-16 14:23 +0100
              Re: Java EE Architecture Donkey Hottie <donkey@fredriksson.dy.fi> - 2013-10-16 17:10 +0300
                Re: Java EE Architecture lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-10-16 16:44 +0100
                Re: Java EE Architecture "L." <carisio@gmail.com> - 2013-10-16 10:15 -0700
                Re: Java EE Architecture lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-10-16 19:01 +0100
                Re: Java EE Architecture "L." <carisio@gmail.com> - 2013-10-16 12:17 -0700
                Re: Java EE Architecture Martin Gregorie <martin@address-in-sig.invalid> - 2013-10-16 21:01 +0000
                Re: Java EE Architecture Arne Vajhøj <arne@vajhoej.dk> - 2013-10-16 20:40 -0400
                Re: Java EE Architecture Donkey Hottie <donkey@fredriksson.dy.fi> - 2013-10-17 00:00 +0300
              Re: Java EE Architecture Wayne <nospam@all.invalid> - 2013-10-16 23:08 -0400
                Re: Java EE Architecture Donkey Hottie <donkey@fredriksson.dy.fi> - 2013-10-19 17:05 +0300
                Re: Java EE Architecture Lew <lewbloch@gmail.com> - 2013-10-19 14:48 -0700
                Re: Java EE Architecture lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-10-20 09:00 +0100
                Re: Java EE Architecture "Qu0ll" <Qu0llSixFour@gmail.com> - 2013-10-20 19:40 +1100
                Re: Java EE Architecture lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-10-20 10:07 +0100
          Re: Java EE Architecture Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-12-16 20:14 -0400
            Re: Java EE Architecture lipska the kat <"lipskathekat at yahoo dot co dot uk"> - 2013-12-17 08:47 +0000
        Re: Java EE Architecture Jeff Higgins <jeff@invalid.invalid> - 2013-10-16 20:19 -0400
          Re: Java EE Architecture Jeff Higgins <jeff@invalid.invalid> - 2013-10-16 21:24 -0400
      Re: Java EE Architecture lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-10-16 11:49 +0100
        Re: Java EE Architecture "Qu0ll" <Qu0llSixFour@gmail.com> - 2013-10-16 22:24 +1100
          Re: Java EE Architecture lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-10-16 13:39 +0100
            Re: Java EE Architecture Arne Vajhøj <arne@vajhoej.dk> - 2013-10-16 20:39 -0400
              Re: Java EE Architecture "Qu0ll" <Qu0llSixFour@gmail.com> - 2013-10-17 13:43 +1100
              Re: Java EE Architecture Jeff Higgins <jeff@invalid.invalid> - 2013-10-16 23:22 -0400
                Re: Java EE Architecture lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-10-17 08:53 +0100
              Re: Java EE Architecture lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-10-17 08:57 +0100
                Re: Java EE Architecture "Qu0ll" <Qu0llSixFour@gmail.com> - 2013-10-17 19:31 +1100
                Re: Java EE Architecture lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-10-17 09:56 +0100
                Re: Java EE Architecture "Qu0ll" <Qu0llSixFour@gmail.com> - 2013-10-17 20:18 +1100
                Re: Java EE Architecture lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-10-17 10:56 +0100
                Re: Java EE Architecture "Qu0ll" <Qu0llSixFour@gmail.com> - 2013-10-17 21:39 +1100
                Re: Java EE Architecture lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-10-17 12:08 +0100
                Class Person [was: Java EE Architecture] "Chris Uppal" <chris.uppal@metagnostic.REMOVE-THIS.org> - 2013-10-18 08:19 +0100
                Re: Java EE Architecture Arne Vajhøj <arne@vajhoej.dk> - 2013-10-17 21:00 -0400
                Re: Java EE Architecture Arne Vajhøj <arne@vajhoej.dk> - 2013-10-17 21:02 -0400
                Re: Java EE Architecture lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-10-18 09:06 +0100
                Re: Java EE Architecture lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-10-18 09:04 +0100
                Re: Java EE Architecture Arne Vajhøj <arne@vajhoej.dk> - 2013-10-19 22:43 -0400
                Re: Java EE Architecture lipska the kat <"nospam at neversurrender dot co dot uk"> - 2013-10-20 09:05 +0100
                Re: Java EE Architecture Arne Vajhøj <arne@vajhoej.dk> - 2013-10-20 09:24 -0400
      Re: Java EE Architecture Arne Vajhøj <arne@vajhoej.dk> - 2013-10-16 20:43 -0400

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