Update CacheStorage caches only if it is updated

• Component: WebCore Misc.
• Status: RESOLVED FIXED

[youenn fablet]

This will improve efficiency

[youenn fablet]

Created attachment 319422 [details]
Patch

[Alex Christensen]

Comment on attachment 319422 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=319422&action=review

> Source/WebKit/ChangeLog:9
> +        When sending the list of caches, CacheStorageEngineCaches will compare its counter with the one provided.

Will this work if multiple processes are using the same cache?

> Source/WebCore/Modules/cache/DOMCache.h:80
> +    template<class Decoder> static bool decode(Decoder&, CacheInfos&);

You could use the cool new decoder that returns a std::optional instead of taking a reference.

[youenn fablet]

(In reply to Alex Christensen from comment #2)
> Comment on attachment 319422 [details]
> Patch
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=319422&action=review
> 
> > Source/WebKit/ChangeLog:9
> > +        When sending the list of caches, CacheStorageEngineCaches will compare its counter with the one provided.
> 
> Will this work if multiple processes are using the same cache?

That should work.
Each counter given to CacheStorageEngineCaches comes from a corresponding Document.
We should be able to test that kind of behavior with a single process containing several iframes.

> > Source/WebCore/Modules/cache/DOMCache.h:80
> > +    template<class Decoder> static bool decode(Decoder&, CacheInfos&);
> 
> You could use the cool new decoder that returns a std::optional instead of
> taking a reference.

Ahah, will look at it!

[Alex Christensen]

Comment on attachment 319422 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=319422&action=review

> Source/WebKit/NetworkProcess/cache/CacheStorageEngineCaches.cpp:236
> +    ++m_updateCounter;

We need to make sure to never forget to increment the updateCounter.  Maybe we could wrap this in a function that indicates that we are marking the cache as dirty instead of incrementing a mysterious integer.

[youenn fablet]

(In reply to Alex Christensen from comment #4)
> Comment on attachment 319422 [details]
> Patch
> 
> View in context:
> https://bugs.webkit.org/attachment.cgi?id=319422&action=review
> 
> > Source/WebKit/NetworkProcess/cache/CacheStorageEngineCaches.cpp:236
> > +    ++m_updateCounter;
> 
> We need to make sure to never forget to increment the updateCounter.  Maybe
> we could wrap this in a function that indicates that we are marking the
> cache as dirty instead of incrementing a mysterious integer.

Sounds good, will do this.

I will try to update the decoders as a follow-up patch.

[youenn fablet]

Created attachment 319534 [details]
Patch for landing

[WebKit Commit Bot]

Comment on attachment 319534 [details]
Patch for landing

Clearing flags on attachment: 319534

Committed r221454: <http://trac.webkit.org/changeset/221454>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.

[Radar WebKit Bug Importer]

<rdar://problem/34694049>