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# *****************************************************************************
# * Copyright (c) 2011, 2013-2014 Wind River Systems, Inc. and others.
# * All rights reserved. This program and the accompanying materials
# * are made available under the terms of the Eclipse Public License v1.0
# * which accompanies this distribution, and is available at
# * http://www.eclipse.org/legal/epl-v10.html
# *
# * Contributors:
# * Wind River Systems - initial API and implementation
# *****************************************************************************
from .. import streams
from ... import channel
from ...channel.Command import Command
class StreamsProxy(streams.StreamsService):
def __init__(self, channel):
self.channel = channel
self.listeners = {}
def connect(self, stream_id, done):
done = self._makeCallback(done)
service = self
class ConnectCommand(Command):
def __init__(self):
super(ConnectCommand, self).__init__(service.channel, service,
"connect", (stream_id,))
def done(self, error, args):
if not error:
assert len(args) == 1
error = self.toError(args[0])
done.doneConnect(self.token, error)
return ConnectCommand().token
def disconnect(self, stream_id, done):
done = self._makeCallback(done)
service = self
class DisconnectCommand(Command):
def __init__(self):
super(DisconnectCommand, self).__init__(service.channel,
service, "disconnect",
(stream_id,))
def done(self, error, args):
if not error:
assert len(args) == 1
error = self.toError(args[0])
done.doneDisconnect(self.token, error)
return DisconnectCommand().token
def eos(self, stream_id, done):
done = self._makeCallback(done)
service = self
class EOSCommand(Command):
def __init__(self):
super(EOSCommand, self).__init__(service.channel, service,
"eos", (stream_id,))
def done(self, error, args):
if not error:
assert len(args) == 1
error = self.toError(args[0])
done.doneEOS(self.token, error)
return EOSCommand().token
def read(self, stream_id, size, done):
done = self._makeCallback(done)
service = self
class ReadCommand(Command):
def __init__(self):
super(ReadCommand, self).__init__(service.channel, service,
"read", (stream_id, size))
def done(self, error, args):
lost_size = 0
data = None
eos = False
if not error:
assert len(args) == 4
data = channel.toByteArray(args[0])
error = self.toError(args[1])
lost_size = args[2]
eos = args[3]
done.doneRead(self.token, error, lost_size, data, eos)
return ReadCommand().token
def subscribe(self, stream_type, listener, done):
done = self._makeCallback(done)
service = self
class SubscribeCommand(Command):
def __init__(self):
super(SubscribeCommand, self).__init__(service.channel,
service, "subscribe",
(stream_type,))
def done(self, error, args):
if not error:
assert len(args) == 1
error = self.toError(args[0])
if not error:
l = ChannelEventListener(service, listener)
service.listeners[listener] = l
service.channel.addEventListener(service, l)
done.doneSubscribe(self.token, error)
return SubscribeCommand().token
def unsubscribe(self, stream_type, listener, done):
done = self._makeCallback(done)
service = self
class UnsubscribeCommand(Command):
def __init__(self):
super(UnsubscribeCommand, self).__init__(service.channel,
service,
"unsubscribe",
(stream_type,))
def done(self, error, args):
if not error:
assert len(args) == 1
error = self.toError(args[0])
if not error:
l = service.listeners.pop(listener, None)
if l:
service.channel.removeEventListener(service, l)
done.doneUnsubscribe(self.token, error)
return UnsubscribeCommand().token
def write(self, stream_id, buf, offset, size, done):
done = self._makeCallback(done)
service = self
binary = buf[offset:offset + size]
class WriteCommand(Command):
def __init__(self):
super(WriteCommand, self).__init__(service.channel, service,
"write",
(stream_id, size, binary,))
def done(self, error, args):
if not error:
assert len(args) == 1
error = self.toError(args[0])
done.doneWrite(self.token, error)
return WriteCommand().token
class ChannelEventListener(channel.EventListener):
def __init__(self, service, listener):
self.service = service
self.listener = listener
def event(self, name, data):
try:
args = channel.fromJSONSequence(data)
if name == "created":
if len(args) == 3:
self.listener.created(args[0], args[1], args[2])
else:
assert len(args) == 2
self.listener.created(args[0], args[1], None)
elif name == "disposed":
assert len(args) == 2
self.listener.disposed(args[0], args[1])
else:
raise IOError("Streams service: unknown event: " + name)
except Exception as x:
import sys
x.tb = sys.exc_info()[2]
self.service.channel.terminate(x)
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