def __init__(self, core_services):
self.__channels = {}
self.__core = core_services
self.__logging_manager = LoggingManager(core_services)
self.__channel_publisher = ChannelPublisher(core_services)
self.__channel_publisher.set_logging_manager(self.__logging_manager)
def __init__(self, core_services):
self.__channels = { }
self.__core = core_services
self.__logging_manager = LoggingManager(core_services)
self.__channel_publisher = ChannelPublisher(core_services)
self.__channel_publisher.set_logging_manager(self.__logging_manager)
class ChannelDatabase(ChannelDatabaseInterface):
"""
The :class:`~channels.channel_database.ChannelDatabase` manages the
list of :class:`~channels.channel.Channel` objects and is responsible
for managing the query interface to this list of channel objects.
There should only be one primary :class:`ChannelDatabase` instance
in a running DIA environment, created by the core system. It
implements
:class:`~channels.channel_database_interface.ChannelDatabaseInterface`,
of which there may be additional instances to provide access to
loggers configured in the system.
The core :class:`ChannelDatabase` object in the system is the
latest published state of the channels.
"""
def __init__(self, core_services):
self.__channels = {}
self.__core = core_services
self.__logging_manager = LoggingManager(core_services)
self.__channel_publisher = ChannelPublisher(core_services)
self.__channel_publisher.set_logging_manager(self.__logging_manager)
# ChannelDatabaseInterface functions
def channel_add(self, channel_name, channel_source):
if self.channel_exists(channel_name):
raise ChannelAlreadyExists, "channel '%s' already exists" % \
(channel_name)
channel = Channel(name=channel_name, channel_source=channel_source)
self.__channels[channel_name] = channel
self.__channel_publisher.new_channel(channel)
return channel
def channel_remove(self, channel_name):
chan = self.channel_get(channel_name)
if chan:
# Remove the entry from the channel publisher database.
# Then remove entry from our internal database.
# NOTE: This does NOT delete the object itself!
try:
self.__channel_publisher.remove_channel(chan)
except:
pass
del self.__channels[channel_name]
return chan
def channel_get(self, channel_name):
if not self.channel_exists(channel_name):
raise ChannelDoesNotExist, "channel '%s' does not exist" % \
(channel_name)
return self.__channels[channel_name]
def channel_list(self):
'''
Returns the name of every channel in the database.
'''
return [cn for cn in copy(self.__channels)]
def channel_exists(self, name):
return name in self.__channels
## Additional accessor functions:
def channel_publisher_get(self):
"""
Returns the
:class:`~channels.channel_publisher.ChannelPublisher` for the
system
"""
return self.__channel_publisher
def channel_logging_manager_get(self):
"""
Returns the
:class:`~channels.logging.logging_manager.LoggingManager` for
the system
"""
return self.__logging_manager
class ChannelDatabase(ChannelDatabaseInterface):
"""
The :class:`~channels.channel_database.ChannelDatabase` manages the
list of :class:`~channels.channel.Channel` objects and is responsible
for managing the query interface to this list of channel objects.
There should only be one primary :class:`ChannelDatabase` instance
in a running Dia environment, created by the core system. It
implements
:class:`~channels.channel_database_interface.ChannelDatabaseInterface`,
of which there may be additional instances to provide access to
loggers configured in the system.
The core :class:`ChannelDatabase` object in the system is the
latest published state of the channels.
"""
def __init__(self, core_services):
self.__channels = { }
self.__core = core_services
self.__logging_manager = LoggingManager(core_services)
self.__channel_publisher = ChannelPublisher(core_services)
self.__channel_publisher.set_logging_manager(self.__logging_manager)
# ChannelDatabaseInterface functions
def channel_add(self, channel_name, channel_source):
if self.channel_exists(channel_name):
raise ChannelAlreadyExists, "channel '%s' already exists" % \
(channel_name)
channel = Channel(name=channel_name, channel_source=channel_source)
self.__channels[channel_name] = channel
self.__channel_publisher.new_channel(channel)
return channel
def channel_remove(self, channel_name):
chan = self.channel_get(channel_name)
if chan:
# Remove the entry from the channel publisher database.
# Then remove entry from our internal database.
# NOTE: This does NOT delete the object itself!
try:
self.__channel_publisher.remove_channel(chan)
except:
pass
del self.__channels[channel_name]
return chan
def channel_get(self, channel_name):
if not self.channel_exists:
raise ChannelDoesNotExist, "channel '%s' does not exist" % \
(channel_name)
return self.__channels[channel_name]
def channel_list(self):
return [cn for cn in self.__channels]
def channel_exists(self, name):
return name in self.__channels
## Additional accessor functions:
def channel_publisher_get(self):
"""
Returns the
:class:`~channels.channel_publisher.ChannelPublisher` for the
system
"""
return self.__channel_publisher
def channel_logging_manager_get(self):
"""
Returns the
:class:`~channels.logging.logging_manager.LoggingManager` for
the system
"""
return self.__logging_manager