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Re: File API Feedback

From: Anne van Kesteren <annevk@opera.com>
Date: Wed, 22 Jul 2009 20:39:02 +0200
To: "Michael Nordman" <michaeln@google.com>
Cc: arun@mozilla.com, public-webapps@w3.org
Message-ID: <op.uxhffcmx64w2qv@annevk-t60>
On Wed, 22 Jul 2009 20:26:38 +0200, Michael Nordman <michaeln@google.com> wrote:
> Another aspect of the use case we're discussing (composing a
> multipart/form-data POST for sending vis XHR2) is NOT having to actually
> read the full contents of the file parts into memory while doing this
> composition. That wouldn't work for a large file or for a large number of
> smaller files.
> Gears BlobBuilder accomplishes that by constructing a resulting Blob that
> internally keeps track of a collection of constituent Blobs (some of  
> which may be memory resident and other backed by a files on disk). When Gears
> HttpRequest sends one of these Blobs, it reads things incrementally. So  
> no big memory usage spikes when dealing with file backed Blobs during
> composition of the multipart Blob or during the sending of it (also no  
> big disk usage spikes during composition or sending).

Yeah, I suppose we have to mention that if there's some I/O failure after invoking send() with a FileData object it needs to throw in the sync case and the XMLHttpRequest object needs to dispatch the error event in the async case.

Anne van Kesteren
Received on Wednesday, 22 July 2009 18:40:05 UTC

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