Commits on Oct 15, 2020

1. watchers: use singleton server …

   Theia spawns as many nsfw servers as there are clients, maybe more.
   
   This commit replaces this behaviour by centralizing everything into the
   same service process in order to optimize resources (watch handles are a
   limited resource on a given Linux host).
   
   Some notes on the current design:
   
   - Everytime someone requests to watch an `(uri, options)` couple we will
   re-use the same watch handle (and actual nsfw instance). This allows for
   resource allocation optimizations.
   - Since a given service can only serve a single client, I added an event
   dispatcher named `FileSystemWatcherServiceDispatcher`. You must register
   yourself with some unique id you will use to make requests.
   - The new `.watchUriChanges` function now takes a `clientId` so that
   when events are sent to the dispatcher it then gets routed back to your
   own client.
   - Added a `--nsfw-watcher-verbose` backend argument to enable verbose
   logging for the watcher server.
   
   Signed-off-by: Paul Maréchal <paul.marechal@ericsson.com>

   

   paul-marechal committed Oct 15, 2020
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