This is the first basic implementation of a shared-memory key-value store for
JS message managers. It has one read-write endpoint in the parent process, and
separate read-only endpoints for each child-process message manager.
Changes to the parent endpoint are broadcast to the children as snapshots.
Each snapshot triggers a "change" event with a list of changed keys.
It currently has the following limitations:
- It only supports basic structured clone data. There's no support for blobs,
input streams, message ports... Blob support will be added in a follow-up
patch.
- Changes are currently only broadcast to child endpoints when flush() is
explicitly called in the parent, or when new child processes are launched.
In a follow-up, this will be changed to automatically flush after changes
when the event loop is idle.
- All set operations clone their inputs synchronously, which means that
there's no trivial way for callers to batch multiple changes to a single key
without some additional effort. It might be useful to add a
delayed-serialization option to the .set() call in a follow-up, for callers
who are sure they know what they're doing.
MozReview-Commit-ID: IM8a3UgejXU
--HG--
extra : rebase_source : 66c92d538a5485349bc789028fdc3a6806bc5d5a
extra : source : 2ebaf5f8c6055b11b11d7ec334d54ee941115d48
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