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trygvis |
http://elektronikknett.no/Artikkelarkiv/2015/Oktober/Mikrokontrollere-for-romfart |
| 10:25 |
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trygvis |
oops |
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| 17:41 |
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anth0ny |
If I POST to /cameras, a modern browser knows to invalidate the cache on a GET of /cameras, correct? |
| 17:41 |
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asdf |
sure, lots of stuff do that, including browsers |
| 17:42 |
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anth0ny |
great, and how about if I POST to /cameras/1234, will the browser be aware that /cameras should have an invalidated cache? |
| 17:42 |
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fumanchu_ |
any cache should invalidate on POST |
| 17:42 |
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fumanchu_ |
no. POST <url> tells a cache to invalidate that URL only |
| 17:43 |
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anth0ny |
obviously, this isn't to speak of EVERY browser in every situation, I just don't know much about how browsers interact with REST apis (things like invalidating the cache) |
| 17:43 |
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asdf |
this is explicitly said in http spec i think, it's not just a rest guideline |
| 17:44 |
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anth0ny |
so is there a best practice for saying "hey, I'm updating Camera record 1234, invalidate the cache on list all Camera records"? |
| 17:45 |
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asdf |
hmm, i don't think there is, i think the browser needs to check with the server next time it fires a get (eg. last-modified, or etag) |
| 17:45 |
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fumanchu_ |
no, there isn't |
| 17:46 |
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anth0ny |
great, thanks |
| 17:47 |
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fumanchu_ |
some folks make the client smart enough to do both. some folks use ETags. some folks use server-side caches which have group invalidation policies. some folks (like me) design the resources to minimize such issues. they all have different limitations. |
| 17:48 |
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asdf |
how do you design resources to minimize that? |
| 17:48 |
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asdf |
do you mean eg. not including the /cameras/1234 attributes in the /cameras list, so that on update, the list usually doesnt need to be changed? |
| 17:49 |
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fumanchu_ |
allow that what your OO code wants to call "an object" actually has data from several different scopes, which should be split up among the container resource (cameras/), each entity (cameras/1234/), and "views" which cross-cut multiple entities |
| 17:50 |
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fumanchu_ |
don't duplicate data between the container and the entity, which means if you want to alter the data in the container, you POST/PUT/PATCH the container instead |
| 17:51 |
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asdf |
right |
| 17:51 |
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asdf |
how common are the 'views' in your design? this sounds like something that's only used in uncommon cases? |
| 17:52 |
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fumanchu_ |
https://bitbucket.org/fumanchu/shoji/src/tip/spec.txt?#spec.txt-658 |
| 17:52 |
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asdf |
oh right, i meant to read that; thanks |
| 17:52 |
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fumanchu_ |
yes, a "view" is uncommon, and explicitly read-only |
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