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annotate piecrust/events.py @ 552:9612cfc6455a

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serve: Rewrite of the Server-Sent Event code for build notifications. At the moment the server monitors the asset directories, and notifies the browser when an asset has changed and has been re-processed. * Fix issues around long-running requests/threads which mess up the ability to shutdown the server correctly with `CTRL-C` (see comments in code). * Move the notification queue to each SSE producer, to support having multiple pages open in a browser. * Add JS/CSS for showing quick notifications about re-processed assets. * Add support for hot-reloading CSS and pictures that have been re-processed.
author Ludovic Chabant <ludovic@chabant.com>
date Sat, 08 Aug 2015 16:12:04 -0700
parents f485ba500df3
children f070a4fc033c
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2 class Event(object):
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3 def __init__(self):
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4 self._handlers = []
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6 def __iadd__(self, handler):
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7 self._handlers.append(handler)
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8 return self
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10 def __isub__(self, handler):
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11 self._handlers.remove(handler)
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12 return self
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14 def fire(self, *args, **kwargs):
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15 # Make a copy of the handlers list in case some handler removes
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16 # itself while executing.
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17 handlers = list(self._handlers)
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18 for handler in handlers:
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19 handler(*args, **kwargs)
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