Re: RESTful Toggle
"Jonathan Ballard [email protected] [rest-discuss]" <[email protected]> Thu, 10 Jul 2014 13:33:01 -0700
| Newsgroups | gmane.comp.web.services.rest |
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| Message-ID | <CAAPAK-6FszsgnsJvMUnxfEju8NK_9Ws9mb6Pp=NHHwTmMC73Gw@mail.gmail.com> |
--e89a8ff1c13428ebb004fddcbb59 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" "Is it ReSTul?" If I started with an override for the new OPTION:QUEUE and= demonstrate it, I know, some people will consider it incomplete. If statel= ess means someone else finishes it and gets credit for it, the toggle is ba= d or not ReSTful. We have an ugly toggle, and that is the existentialism o= f /#. POST /#/start POST /#/stop DELETE /# On Wed, Jul 9, 2014 at 10:06= PM, J=C3=B8rn Wildt <[email protected]> wrote: > [Sorry for being a bit = late to this party.] > > Is it RESTful? Thats a question we see a lot of ti= mes ... "Is this POST to > /xyz RESTful" or "Is this a RESTful URL" or "Is = it RESTful to DELETE > this?". Thats not easily answered and its very much = like taking a brick, a > flooring tile or a piece of wall paint from a spec= ific church building and > ask "Is this brick/tile/paint Grotesque?". But a= brick in itself doesn't > necessarily adhere to any specific architectural= style - it can be used in > many different styles. And the same goes for a= URL/HTTP VERB/media-type > what ever - you cannot say in isolation whether= it is RESTful or not - it > depends on how the overall building/system is = built/implemented. > > /J=C3=B8rn > > > On Wed, Jul 9, 2014 at 11:50 PM, Jo= nathan Ballard [email protected] > [rest-discuss] <rest-discuss-noreply@ya= hoogroups.com> wrote: > >> >> >> An upgrade to that would be to override wi= th new OPTION:BANK for an array >> of those kind of toggles. >> >> [This fo= rward-looking statement is intentional.] >> >> >> On Wed, Jul 9, 2014 at 2:= 44 PM, Jonathan Ballard <[email protected]> >> wrote: >> >>> It may requir= e another resource. Move/Swap/Redirect the two states (on >>> and off) base= d on current state rather than one specific state that has no >>> mechanism= itself for toggle. It depends on how persistent and concurrent >>> you wan= t the two states. >>> >>> Solution: >>> >>> POST /state/on >>> POST /state/= off >>> PUT /state/toggle >>> DELETE /state >>> >>> Returns semantics for r= edirected or moved resources. Override with new >>> OPTION:TOGGLE. >>> >>> = >>> >>> On Wed, Jul 9, 2014 at 6:06 AM, Keith P Hassen [email protected]= om >>> [rest-discuss] <[email protected]> wrote: >>> >>>= > >>>> >>>> You could implement a POST operation that simply flips the stat= e, >>>> whatever it is. If you implement PUT, the request should be idempo= tent but >>>> it's unclear if that's what you intend here. Protecting agai= nst the kind >>>> of race conditions you mention is usually performed with = conditional >>>> requests (If-Match, If-None-Match, etc). >>>> >>>> K >>>> = >>>> >>>> >>>> On Tue, Jul 8, 2014 at 5:28 PM, 'Simpson, Robby (GE Energy M= anagement)' >>>> [email protected] [rest-discuss] < >>>> rest-discuss-no= [email protected]> wrote: >>>> >>>>> >>>>> >>>>> Hi, >>>>> >>>>> I've b= een scratching my head over this one for a while and am hoping I >>>>> can = >>>>> get some help. >>>>> >>>>> Imagine a light switch with one simple res= ource: /state , where state >>>>> can >>>>> be "On" or "Off." >>>>> >>>>> O= ne can PUT to /state , changing /state to either "On" or "Off." >>>>> Simil= arly, a GET to /state will tell you if the light is currently >>>>> "On" or= >>>>> "Off." >>>>> >>>>> Where I'm struggling is with a safe "Toggle" mech= anism. That is, if >>>>> /state is "On", change it to "Off" and vice versa.= >>>>> >>>>> I understand that one solution would be to simply perform a GE= T on >>>>> /state >>>>> and then PUT the opposite. However, I am concerned = with both the >>>>> overhead >>>>> and latency this entails as well as the = potential for a race condition >>>>> (what if /state changes between the GE= T and the PUT?). >>>>> >>>>> Any solution I've looked at thus far seems to = violate RESTful >>>>> principles, >>>>> particularly regarding idempotency.= In short, can one safely toggle? >>>>> >>>>> Any suggestions? >>>>> >>>>> = Thanks, >>>>> Robby >>>>> >>>>> >>>> >>> >> >> > > --e89a8ff1c13428ebb004fddcbb59 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/htm= l4/strict.dtd"> <html> <head> </head> =20 <body style=3D"background-color: #fff;"> <span style=3D"display:none"> </span> <!--~-|**|PrettyHtmlStartT|**|-~--> <div id=3D"ygrp-mlmsg" style=3D"position:relative;"> <div id=3D"ygrp-msg" style=3D"z-index: 1;"> <!--~-|**|PrettyHtmlEndT|**|-~--> <div id=3D"ygrp-text" > =20=20=20=20=20=20 =20=20=20=20=20=20 <p><div dir=3D"ltr">"Is it ReSTul?"<div><br></div><div>If I= started with an override for the new OPTION:QUEUE and demonstrate it, I kn= ow, some people will consider it incomplete. If stateless means someone els= e finishes it and gets credit for it, the toggle is bad or not ReSTful.</di= v> <div><br></div><div>We have an ugly toggle, and that is the existentialism = of /#.</div><div><br></div><div>POST /#/start</div><div>POST /#/stop</div><= div>DELETE /#</div><div><br></div></div><div class=3D"gmail_extra"><br><br> <div class=3D"gmail_quote">On Wed, Jul 9, 2014 at 10:06 PM, J=C3=B8rn Wildt= <span dir=3D"ltr"><<a href=3D"mailto:[email protected]" target=3D"_bla= nk">[email protected]</a>></span> wrote:<br><blockquote class=3D"gmail_= quote" style=3D"border-left:1px #ccc solid;"> <div dir=3D"ltr"><div>[Sorry for being a bit late to this party.]<br><br>Is= it RESTful? Thats a question we see a lot of times ... "Is this POST = to /xyz RESTful" or "Is this a RESTful URL" or "Is it R= ESTful to DELETE this?". Thats not easily answered and its very much l= ike taking a brick, a flooring tile or a piece of wall paint from a specifi= c church building and ask "Is this brick/tile/paint Grotesque?". = But a brick in itself doesn't necessarily adhere to any specific archit= ectural style - it can be used in many different styles. And the same goes = for a URL/HTTP VERB/media-type what ever - you cannot say in isolation whet= her it is RESTful or not - it depends on how the overall building/system is= built/implemented.<br> <br></div>/J=C3=B8rn<br></div><div class=3D"gmail_extra"><br><br><div class= =3D"gmail_quote"><div><div class=3D"h5">On Wed, Jul 9, 2014 at 11:50 PM, Jo= nathan Ballard <a href=3D"mailto:[email protected]" target=3D"_blank">dzon= [email protected]</a> [rest-discuss] <span dir=3D"ltr"><<a href=3D"mailto:r= [email protected]" target=3D"_blank">rest-discuss-noreply= @yahoogroups.com</a>></span> wrote:<br> </div></div><blockquote class=3D"gmail_quote" style=3D"border-left:1px #ccc= solid;"> <u></u> =20 <div style=3D"background-color:#fff;"> <span>=C2=A0</span> <div> <div><div><div class=3D"h5"> <div> =20=20=20=20=20=20 =20=20=20=20=20=20 <p></p><div dir=3D"ltr">An upgrade to that would be to override with = new OPTION:BANK for an array of those kind of toggles.<div><br></div><div>[= This forward-looking statement is intentional.]</div></div><div><div> <div class=3D"gmail_extra"><br> <br><div class=3D"gmail_quote">On Wed, Jul 9, 2014 at 2:44 PM, Jonathan Bal= lard <span dir=3D"ltr"><<a href=3D"mailto:[email protected]" target=3D"= _blank">[email protected]</a>></span> wrote:<br><blockquote class=3D"gm= ail_quote" style=3D"border-left:1px #ccc solid;"> <div dir=3D"ltr">It may require another resource. Move/Swap/Redirect the tw= o states (on and off) based on current state rather than one specific state= that has no mechanism itself for toggle. It depends on how persistent and = concurrent you want the two states.<div> <br></div><div>Solution:</div><div><br></div><div>POST /state/on</div><div>= POST /state/off</div><div>PUT /state/toggle</div><div>DELETE /state<br><div= ><br></div></div><div>Returns semantics for redirected or moved resources. = Override with new OPTION:TOGGLE.=C2=A0</div> <div><br></div></div><div><div><div class=3D"gmail_extra"><br><br><div clas= s=3D"gmail_quote">On Wed, Jul 9, 2014 at 6:06 AM, Keith P Hassen <a href=3D= "mailto:[email protected]" target=3D"_blank">[email protected]</a= > [rest-discuss] <span dir=3D"ltr"><<a href=3D"mailto:rest-discuss-norep= [email protected]" target=3D"_blank">[email protected]<= /a>></span> wrote:<br> <blockquote class=3D"gmail_quote" style=3D"border-left:1px #ccc solid;"> <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 class=3D"gmail_default" style=3D"font-fa= mily:trebuchet ms,sans-serif;font-size:small;color:rgb(51,51,51);">You coul= d implement a POST operation that simply flips the state, whatever it is.= =C2=A0 If you implement PUT, the request should be idempotent but it's = unclear if that's what you intend here.=C2=A0 Protecting against the ki= nd of race conditions you mention is usually performed with conditional req= uests (If-Match, If-None-Match, etc).<br> <br></div><div class=3D"gmail_default" style=3D"font-family:trebuchet ms,sa= ns-serif;font-size:small;color:rgb(51,51,51);">K<br><br></div></div><div><d= iv class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Tue, Jul 8, = 2014 at 5:28 PM, 'Simpson, Robby (GE Energy Management)' <a href=3D= "mailto:[email protected]" target=3D"_blank">[email protected]</a> [r= est-discuss] <span dir=3D"ltr"><<a href=3D"mailto:rest-discuss-noreply@y= ahoogroups.com" target=3D"_blank">[email protected]</a>&= gt;</span> wrote:<br> <blockquote class=3D"gmail_quote" style=3D"border-left:1px #ccc solid;"> <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>Hi,<br> <br> I've been scratching my head over this one for a while and am hoping I = can<br> get some help.<br> <br> Imagine a light switch with one simple resource: /state , where state can<b= r> be "On" or "Off."<br> <br> One can PUT to /state , changing /state to either "On" or "O= ff."<br> Similarly, a GET to /state will tell you if the light is currently "On= " or<br> "Off."<br> <br> Where I'm struggling is with a safe "Toggle" mechanism. That= is, if<br> /state is "On", change it to "Off" and vice versa.<br> <br> I understand that one solution would be to simply perform a GET on /state<b= r> and then PUT the opposite. However, I am concerned with both the overhead<= br> and latency this entails as well as the potential for a race condition<br> (what if /state changes between the GET and the PUT?).<br> <br> Any solution I've looked at thus far seems to violate RESTful principle= s,<br> particularly regarding idempotency. In short, can one safely toggle?<br> <br> Any suggestions?<br> <br> Thanks,<br> Robby<br> <br> </p> </div> =20=20=20=20=20 =20=20=20=20 <div style=3D"color:#fff;min-height:0;"></div> </div> =20=20 </div></div></blockquote></div><br></div> </div><p></p> </div> =20=20=20=20=20 =20=20=20=20 <div style=3D"color:#fff;min-height:0;"></div> </div> =20=20 </div></div></blockquote></div><br></div> </div></div></blockquote></div><br></div> </div></div><p></p> </div></div></div><div><div> =20=20=20=20=20 =20=20=20=20 <div style=3D"color:#fff;min-height:0;"></div> </div> =20=20 </div></div></div></div></blockquote></div><br></div> </blockquote></div><br></div> </p> </div> =20=20=20=20=20 <!--~-|**|PrettyHtmlStart|**|-~--> <div style=3D"color: #fff; height: 0;">__._,_.___</div> =20=20=20=20=20=20=20=20=20=20 =20=20 =20 =20=20=20=20 <div style=3D"clear:both"> </div> <div id=3D"fromDMARC" style=3D"margin-top: 10px;"> <hr style=3D"height:2px ; border-width:0; color:#E3E3E3; background= -color:#E3E3E3;"> Posted by: Jonathan Ballard <[email protected]> <hr s= tyle=3D"height:2px ; border-width:0; color:#E3E3E3; background-color:#E3E3E= 3;"> </div> <div style=3D"clear:both"> </div> <table cellspacing=3D4px style=3D"margin-top: 10px; margin-bottom: 10px= ; color: #2D50FD;"> <tbody> <tr> <td style=3D"font-size: 12px; font-family: arial; font-weight: bo= ld; padding: 7px 5px 5px;" > <a style=3D"text-decoration: none; color: #2D50FD= " href=3D"https://groups.yahoo.com/neo/groups/rest-discuss/conversations/me= ssages/19693;_ylc=3DX3oDMTJxcmw3MGRzBF9TAzk3MzU5NzE0BGdycElkAzQzMTkyNTUEZ3J= wc3BJZAMxNzA1NzAxMDE0BG1zZ0lkAzE5NjkzBHNlYwNmdHIEc2xrA3JwbHkEc3RpbWUDMTQwNT= AzMDEyMA--?act=3Dreply&messageNum=3D19693">Reply via web post</a> </td> <td>•</td> <td style=3D"font-size: 12px; font-family: arial; padding: 7px 5p= x 5px;" > <a href=3D"mailto:[email protected]?subject=3DRe%3A%20%5Brest-= discuss%5D%20RESTful%20Toggle" style=3D"text-decoration: none; color: #2D50= FD;"> Reply to sender </a> </td> <td>•</td> <td style=3D"font-size: 12px; font-family: arial; padding: 7px 5p= x 5px;"> <a href=3D"mailto:[email protected]?subject=3DRe%3A%= 20%5Brest-discuss%5D%20RESTful%20Toggle" style=3D"text-decoration: none; co= lor: #2D50FD"> Reply to group </a> </td> <td>•</td> <td style=3D"font-size: 12px; font-family: arial; padding: 7px 5p= x 5px;" > <a href=3D"https://groups.yahoo.com/neo/groups/rest-discuss/con= versations/newtopic;_ylc=3DX3oDMTJlN3Jqam1rBF9TAzk3MzU5NzE0BGdycElkAzQzMTky= NTUEZ3Jwc3BJZAMxNzA1NzAxMDE0BHNlYwNmdHIEc2xrA250cGMEc3RpbWUDMTQwNTAzMDEyMA-= -" style=3D"text-decoration: none; color: #2D50FD">Start a New Topic</a> </td> <td>•</td> <td style=3D"font-size: 12px; font-family: arial; padding: 7px 5p= x 5px;color: #2D50FD;" > <a href=3D"https://groups.yahoo.com/neo/groups/= rest-discuss/conversations/topics/19657;_ylc=3DX3oDMTM2dmhpczRxBF9TAzk3MzU5= NzE0BGdycElkAzQzMTkyNTUEZ3Jwc3BJZAMxNzA1NzAxMDE0BG1zZ0lkAzE5NjkzBHNlYwNmdHI= Ec2xrA3Z0cGMEc3RpbWUDMTQwNTAzMDEyMAR0cGNJZAMxOTY1Nw--" style=3D"text-decora= tion: none; color: #2D50FD;">Messages in this topic</a> (36) </td> </tr> </tbody> </table> =20=20=20=20=20=20=20=20 <!------- Start Nav Bar ------> =20 <!-- |**|begin egp html banner|**| --> <div id=3D"ygrp-vital" style=3D"background-color: #f2f2f2; font-family: Ver= dana; font-size: 10px; margin-bottom: 10px; padding: 10px;"> <span id=3D"vithd" style=3D"font-weight: bold; color: #333; text-transf= orm: uppercase; "><a href=3D"https://groups.yahoo.com/neo/groups/rest-discu= ss/info;_ylc=3DX3oDMTJlMWdxcnNoBF9TAzk3MzU5NzE0BGdycElkAzQzMTkyNTUEZ3Jwc3BJ= ZAMxNzA1NzAxMDE0BHNlYwN2dGwEc2xrA3ZnaHAEc3RpbWUDMTQwNTAzMDEyMA--" 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/re= st-discuss/members/all;_ylc=3DX3oDMTJmNXJlcHZ2BF9TAzk3MzU5NzE0BGdycElkAzQzM= TkyNTUEZ3Jwc3BJZAMxNzA1NzAxMDE0BHNlYwN2dGwEc2xrA3ZtYnJzBHN0aW1lAzE0MDUwMzAx= MjA-" style=3D"text-decoration: none;">New Members</a></span> <span class=3D"ct" style=3D"color: #ff7900;">3</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=3DX3oDMTJka2FqdjFxBF9TAzk3ND= c2NTkwBGdycElkAzQzMTkyNTUEZ3Jwc3BJZAMxNzA1NzAxMDE0BHNlYwNmdHIEc2xrA2dmcARzd= GltZQMxNDA1MDMwMTIw" 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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