Re: DDD Implementation: Marker interfaces for all classes
"Paul Rayner [email protected] [domaindrivendesign]" <[email protected]> Sat, 13 Aug 2016 10:36:38 -0600
| Newsgroups | gmane.comp.programming.domain-driven-design |
|---|---|
| Message-ID | <CAKKp0qiX9cia9ExJHmaKEcy_dZ3qSz=W3-3zk=T97UAa=v4Wkw@mail.gmail.com> |
--001a114e5e9ace7a980539f69c75 Content-Type: text/plain; charset=UTF-8 On Sat, Aug 13, 2016 at 12:28 AM, Niklas Mehner [email protected] [domaindrivendesign] <[email protected]> wrote: > > > Hello everyone, > > We are currently in a somewhat heated discussions about the design for a > new software. > > One of the discussion points is the use of marker interfaces. > > I am perfectly fine with using marker interfaces like: > > SomeService implements DomainService { > ... > } > > to make the architecture visible in the code and implement some > verification of code properties. > > But now some people want to add the requirement to have assign each class > to a building block (Entity/Value Object/Service/...). > Has anybody ever successfully done this? Is this even possible without > some "GenericImplementationObject" building block? > Are you saying you want to have each class named according to its building block pattern name, or something like that? I can't think of any good reason to do this. The building block patterns are *not* the important concepts in your domain model, the ubiquitous language is. Focus *first* on the language of your domain model. The implementation patterns used to represent the concepts are secondary concerns. --001a114e5e9ace7a980539f69c75 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable <head> <style type=3D"text/css"> <!-- /* start of attachment style */ .ygrp-photo-title{ clear: both; font-size: smaller; height: 15px; overflow: hidden; text-align: center; width: 75px; } div.ygrp-photo{ background-position: center; background-repeat: no-repeat; background-color: white; border: 1px solid black; height: 62px; width: 62px; } div.photo-title=20 a, div.photo-title a:active, div.photo-title a:hover, div.photo-title a:visited { text-decoration: none;=20 } div.attach-table div.attach-row { clear: both; } div.attach-table div.attach-row div { float: left; /* margin: 2px;*/ } p { clear: both; padding: 15px 0 3px 0; overflow: hidden; } div.ygrp-file { width: 30px; valign: middle; } div.attach-table div.attach-row div div a { text-decoration: none; } div.attach-table div.attach-row div div span { font-weight: normal; } div.ygrp-file-title { font-weight: bold; } /* end of attachment style */ --> </style> </head> <html> <head> <style type=3D"text/css"> <!-- #ygrp-mkp { border: 1px solid #d8d8d8; font-family: Arial; margin: 10px 0; padding: 0 10px; } #ygrp-mkp hr { border: 1px solid #d8d8d8; } #ygrp-mkp #hd { color: #628c2a; font-size: 85%; font-weight: 700; line-height: 122%; margin: 10px 0; } #ygrp-mkp #ads { margin-bottom: 10px; } #ygrp-mkp .ad { padding: 0 0; } #ygrp-mkp .ad p { margin: 0; } #ygrp-mkp .ad a { color: #0000ff; text-decoration: none; } --> </style> </head> <body> <!-- |**|begin egp html banner|**| --> <br><br> <!-- |**|end egp html banner|**| --> <div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><div class=3D"gmail_quo= te">On Sat, Aug 13, 2016 at 12:28 AM, Niklas Mehner <a href=3D"mailto:nikla= [email protected]">[email protected]</a> [domaindrivendesign] <span = dir=3D"ltr"><<a href=3D"mailto:[email protected]" targe= t=3D"_blank">[email protected]</a>></span> wrote:<br><b= lockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px = #ccc solid;padding-left:1ex"> <u></u> =20 <div style=3D"background-color:#fff"> <span>=C2=A0</span> <div> <div> <div> =20=20=20=20=20=20 =20=20=20=20=20=20 <p></p><div dir=3D"ltr"><div><div><div><div><div><div><div><div>Hello= everyone,<br><br></div>We are currently in a somewhat heated discussions a= bout the design for a new software.<br><br></div>One of the discussion poin= ts is the use of marker interfaces.<br><br></div>I am perfectly fine with u= sing marker interfaces like:<br><br></div>SomeService implements DomainServ= ice {<br>=C2=A0=C2=A0 ...<br>}<br><br></div><div>to make the architecture v= isible in the code and implement some verification of code properties.<br><= /div><div><br></div>But now some people want to add the requirement to have= assign each class to a building block (Entity/Value Object/Service/...).<b= r></div>Has anybody ever successfully done this? Is this even possible with= out some "GenericImplementationObject" building block?<br></div><= /div></div></div></div></div></div></blockquote><div><br></div><div>Are you= saying you want to have each class named according to its building block p= attern name, or something like that? I can't think of any good reason t= o do this. The building block patterns are <i>not</i> the important concept= s in your domain model, the ubiquitous language is. Focus <i>first</i> on t= he language of your domain model. The implementation patterns used to repre= sent the concepts are secondary concerns.</div></div></div></div> <!-- |**|begin egp html banner|**| --> <br> <br> <!-- |**|end egp html banner|**| --> <div width=3D"1" style=3D"color: white; clear: both;"/>__._,_.___</div> =20=20=20=20=20=20 =20=20 =20=20=20=20 <div id=3D"fromDMARC" style=3D"clear:both; margin-top: 10px;"> <hr style=3D"height:2px ; border-width:0; color:#E3E3E3; backgroun= d-color:#E3E3E3;"> Posted by: Paul Rayner <[email protected]> <hr = style=3D"height:2px ; border-width:0; color:#E3E3E3; background-color:#E3E3= E3;"> </div> <!-- Start Recommendations --> <!-- End Recommendations --> <!-- |**|begin egp html banner|**| --> <img src=3D"http://geo.yahoo.com/serv?s=3D97476590/grpId=3D8116923/grpspI= d=3D1705007181/msgId=3D24786/stime=3D1471107729" width=3D"1" height=3D"1"> = <br> <!-- |**|end egp html banner|**| --> =20=20 <!-- |**|begin egp html banner|**| --> <br> =20=20=20 =20=20=20=20=20 =20 <!-- |**|begin egp html banner|**| --> <div id=3D"ygrp-vital" style=3D"background-color: #f2f2f2; font-fam= ily: Verdana; font-size: 10px; margin-bottom: 10px; padding: 10px;"> <span id=3D"vithd" style=3D"font-weight: bold; color: #333; text-tr= ansform: uppercase; "><a href=3D"https://groups.yahoo.com/neo/groups/domain= drivendesign/info;_ylc=3DX3oDMTJlajFsOGw0BF9TAzk3MzU5NzE0BGdycElkAzgxMTY5Mj= MEZ3Jwc3BJZAMxNzA1MDA3MTgxBHNlYwN2dGwEc2xrA3ZnaHAEc3RpbWUDMTQ3MTEwNzcyOQ--"= style=3D"text-decoration: none;">Visit Your Group</a></span> <ul style=3D"list-style-type: none; margin: 0; padding: 0; display: in= line;"> <li style=3D"border-right: 1px solid #000; font-weight: 700; di= splay: inline; padding: 0 5px; margin-left: 0;"> <span class=3D"cat"><a href=3D"https://groups.yahoo.com/neo/groups/do= maindrivendesign/members/all;_ylc=3DX3oDMTJmcXVsbzE2BF9TAzk3MzU5NzE0BGdycEl= kAzgxMTY5MjMEZ3Jwc3BJZAMxNzA1MDA3MTgxBHNlYwN2dGwEc2xrA3ZtYnJzBHN0aW1lAzE0Nz= ExMDc3Mjk-" style=3D"text-decoration: none;">New Members</a></span> <span class=3D"ct" style=3D"color: #ff7900;">2</span> </li> </ul> </div> <div id=3D"ft" style=3D"font-family: Arial; font-size: 11px; margin-top: 5p= x; padding: 0 2px 0 0; clear: both;"> <a href=3D"https://groups.yahoo.com/neo;_ylc=3DX3oDMTJkNjlxNmdvBF9TAzk3ND= c2NTkwBGdycElkAzgxMTY5MjMEZ3Jwc3BJZAMxNzA1MDA3MTgxBHNlYwNmdHIEc2xrA2dmcARzd= GltZQMxNDcxMTA3NzI5" style=3D"float: left;"><img src=3D"http://l.yimg.com/r= u/static/images/yg/img/email/new_logo/logo-groups-137x15.png" height=3D"15"= width=3D"137" alt=3D"Yahoo! 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