Rdh resource fetcher events #150
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…after doing so. This provides plugin resource fetchers a hook to do some additional processing when fetching internal resources. For example, a resource fetcher might batch up the requested files, and process them all in one go.
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Related issue(s) and/or pull request(s)
See also #144*
Test cases, sample files
Additional information
Provides additional events to be emitted when resource fetcher is getting internal resources (files listed in the HTML of the chapter) and for files embedded in the css file(s).
The Bibliotheca hybrid app uses this to help it's resource fetcher plugin batch up file requests. Essentially, when the start event is emitted, it begins a batch; then individual file requests are queued up. When the end event is emitted, it sends the queued up list of files to the API, which reads the contents of each specified file and returns the contents as a response.
This helps to make the resource fetcher more performant because it limits the number of requests sent across the wire.