def choose_sync_strategies(self):
"""Determines the sync strategy for the command.
It defaults to the default sync strategies but a customizable sync
strategy can overide the default strategy if it returns the instance
of its self when the event is emitted.
"""
sync_strategies = {}
# Set the default strategies.
sync_strategies['file_at_src_and_dest_sync_strategy'] = \
SizeAndLastModifiedSync()
sync_strategies['file_not_at_dest_sync_strategy'] = MissingFileSync()
sync_strategies['file_not_at_src_sync_strategy'] = NeverSync()
# Determine what strategies to overide if any.
responses = self.session.emit('choosing-s3-sync-strategy',
params=self.parameters)
if responses is not None:
for response in responses:
override_sync_strategy = response[1]
if override_sync_strategy is not None:
sync_type = override_sync_strategy.sync_type
sync_type += '_sync_strategy'
sync_strategies[sync_type] = override_sync_strategy
return sync_strategies
def setUp(self):
self.sync_strategy = NeverSync()
