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[Bug 11350] New: [IndexedDB] ObjectStores should have a way to hint that they're "evictable"

From: <bugzilla@jessica.w3.org>
Date: Fri, 19 Nov 2010 12:05:25 +0000
To: public-webapps@w3.org
Message-ID: <bug-11350-2927@http.www.w3.org/Bugs/Public/>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=11350

           Summary: [IndexedDB] ObjectStores should have a way to hint
                    that they're "evictable"
           Product: WebAppsWG
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Indexed Database API
        AssignedTo: dave.null@w3.org
        ReportedBy: jorlow@chromium.org
         QAContact: member-webapi-cvs@w3.org
                CC: mike@w3.org, public-webapps@w3.org


At TPAC, we talked about whether we should make some way for web apps to tell
the UA that data is not critical.  Many uses for IndexedDB are such that it's
not a big deal if data is discarded, but there are some use cases where it's
critical.  For example, the archive of your email for all time might not be
critical, but the email you wrote while offline that still hasn't gotten a
chance to send yet is.

We discussed what the proper granularity is.  Per record seems very difficult
to implement efficiently.  Per database means that you can't have transactions
that involve both both classes of data.  So we decided to make it
per-objectStore.

createObjectStore's optional parameters will turn into a single optional
options object that gets passed in.  So, for example, you would do
.createObjectStore("name", {autoIncrement: true, keyPath: "id"}); to create an
objectStore with an autoIncrement number stored in the id keyPath and the name
of "name".

We'll then add another parameter to the optional options object parameter that
is "evictable" which states whether or not the browser can get rid of the data
at its discretion.  This will default to false.

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Received on Friday, 19 November 2010 12:05:30 GMT

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