[issue3518] multiprocessing: BaseManager.from_address documented but doesn't exist

[Richard Oudkerk]

Changes by Richard Oudkerk :


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stage:  -> committed/rejected
status: open -> closed

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[issue3518] multiprocessing: BaseManager.from_address documented but doesn't exist

[Roundup Robot]

Roundup Robot  added the comment:

New changeset c2910971eb86 by Richard Oudkerk in branch 'default':
Issue #3518: Remove references to non-existent BaseManager.from_address()
http://hg.python.org/cpython/rev/c2910971eb86

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[issue3518] multiprocessing: BaseManager.from_address documented but doesn't exist

[R. David Murray]

Changes by R. David Murray :


--
assignee: jnoller -> 
nosy: +sbt
versions: +Python 2.7, Python 3.2, Python 3.3 -Python 2.6, Python 3.0

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[issue3518] multiprocessing: BaseManager.from_address documented but doesn't exist

[Ask Solem]

Changes by Ask Solem :


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[issue3518] multiprocessing: BaseManager.from_address documented but doesn't exist

[Jesse Noller]

Changes by Jesse Noller :


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resolution: fixed -> accepted
status: closed -> open

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[issue3518] multiprocessing: BaseManager.from_address documented but doesn't exist

[Casey McGinty]

Casey McGinty  added the comment:

I would like to open this ticket back up.

Python 2.6.2 docs still reference unimplemented 'from_address' method.

http://docs.python.org/library/multiprocessing.html#multiprocessing.managers.BaseManager.from_address

BaseManager.__reduce__ method also calls unimplemented 'from_address'
method. This looks like a bug since there is no docs or comments that
indicate it is as an abstract method.

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[issue3518] multiprocessing: BaseManager.from_address documented but doesn't exist

[Jesse Noller]

Jesse Noller <[EMAIL PROTECTED]> added the comment:

Added the mp.managers shared queue example, fixed the docs in r67419 on 
trunk. merged to py3k and 2.6.1 maint

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resolution:  -> fixed
status: open -> closed

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[issue3518] multiprocessing: BaseManager.from_address documented but doesn't exist

[Mart Sõmermaa]

Mart Sõmermaa <[EMAIL PROTECTED]> added the comment:

I propose we add the following to that section as well.

If you need to provide access to a queue from both local and remote
processes, use `multiprocessing.Queue` in the server:

>>> from multiprocessing import Process, Queue
>>> from multiprocessing.managers import BaseManager
>>> class Worker(Process):
... def __init__(self, q):
... self.q = q
... super(Worker, self).__init__()
... def run(self):
... self.q.put('local hello')
... 
>>> q = Queue()
>>> w = Worker(q)
>>> w.start()
>>> class QueueManager(BaseManager): pass
... 
>>> QueueManager.register('getQueue', callable=lambda: q)
>>> m = QueueManager(address=('', 5), authkey='abracadabra')
>>> s = m.get_server()
>>> s.serve_forever()

Use it in the client as shown above:

>>> from multiprocessing.managers import BaseManager
>>> class QueueManager(BaseManager): pass
... 
>>> QueueManager.register('getQueue')
>>> m = QueueManager(address=('localhost', 5), authkey='abracadabra')
>>> m.connect()
>>> q = m.getQueue()
>>> q.get()
'local hello'
>>> q.put('remote hello')

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[issue3518] multiprocessing: BaseManager.from_address documented but doesn't exist

[Mart Sõmermaa]

Mart Sõmermaa <[EMAIL PROTECTED]> added the comment:

Also, it would be helpful to elaborate a bit more on:

major:
 * how to implement a queue that is shared both locally and remotely
(i.e. n local processes access the queue as well as m remote processes)

minor:
 * blocking (assumption: q.get() blocks on socket.recv())
 * timeout (assumption: the socket does not time out, e.g. q.get()
blocks endlessly on socket.recv())

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[issue3518] multiprocessing: BaseManager.from_address documented but doesn't exist

[Mart Sõmermaa]

Mart Sõmermaa <[EMAIL PROTECTED]> added the comment:

The documentation should be amended as follows:

Running the following commands creates a server for a single shared
queue which remote clients can access:

>>> from multiprocessing.managers import BaseManager
>>> import Queue
>>> queue = Queue.Queue()
>>> class QueueManager(BaseManager): pass
...
>>> QueueManager.register('getQueue', callable=lambda:queue)
>>> m = QueueManager(address=('', 5), authkey='abracadabra')
>>> s = m.get_server()
>>> s.serve_forever()

One client can access the server as follows:

>>> from multiprocessing.managers import BaseManager
>>> class QueueManager(BaseManager): pass
...
>>> QueueManager.register('getQueue')
>>> m = QueueManager(address=('localhost', 5), authkey='abracadabra')
>>> m.connect()
>>> q = m.getQueue()
>>> q.put('hello')

Another client can also use it:

>>> from multiprocessing.managers import BaseManager
>>> class QueueManager(BaseManager): pass
...
>>> QueueManager.register('getQueue')
>>> m = QueueManager(address=('localhost', 5), authkey='abracadabra')
>>> m.connect()
>>> q = m.getQueue()
>>> q.get()

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[issue3518] multiprocessing: BaseManager.from_address documented but doesn't exist

[Mark Dickinson]

New submission from Mark Dickinson <[EMAIL PROTECTED]>:

The BaseManager.from_address method is documented at:

http://docs.python.org/dev/library/multiprocessing.html#multiprocessing.ma
nagers.BaseManager.from_address

but it looks as though this method doesn't actually exist.  In contrast, 
the BaseManager.connect method appears to be necessary for making remote 
connections, but is not documented.

--
assignee: jnoller
components: Documentation
messages: 70844
nosy: jnoller, marketdickinson
severity: normal
status: open
title: multiprocessing: BaseManager.from_address documented but doesn't exist
versions: Python 2.6, Python 3.0

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