author | Alex Gilkes <alex.gilkes@nokia.com> |
Wed, 28 Oct 2009 14:39:48 +0000 | |
changeset 1 | be27ed110b50 |
permissions | -rw-r--r-- |
1
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
1 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
2 |
# -*- coding: UTF-8 -*- |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
3 |
"""Easy to use object-oriented thread pool framework. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
4 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
5 |
A thread pool is an object that maintains a pool of worker threads to perform |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
6 |
time consuming operations in parallel. It assigns jobs to the threads |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
7 |
by putting them in a work request queue, where they are picked up by the |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
8 |
next available thread. This then performs the requested operation in the |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
9 |
background and puts the results in a another queue. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
10 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
11 |
The thread pool object can then collect the results from all threads from |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
12 |
this queue as soon as they become available or after all threads have |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
13 |
finished their work. It's also possible, to define callbacks to handle |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
14 |
each result as it comes in. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
15 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
16 |
The basic concept and some code was taken from the book "Python in a Nutshell" |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
17 |
by Alex Martelli, copyright 2003, ISBN 0-596-00188-6, from section 14.5 |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
18 |
"Threaded Program Architecture". I wrapped the main program logic in the |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
19 |
ThreadPool class, added the WorkRequest class and the callback system and |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
20 |
tweaked the code here and there. Kudos also to Florent Aide for the exception |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
21 |
handling mechanism. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
22 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
23 |
Basic usage: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
24 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
25 |
>>> pool = TreadPool(poolsize) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
26 |
>>> requests = makeRequests(some_callable, list_of_args, callback) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
27 |
>>> [pool.putRequest(req) for req in requests] |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
28 |
>>> pool.wait() |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
29 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
30 |
See the end of the module code for a brief, annotated usage example. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
31 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
32 |
Website : http://chrisarndt.de/en/software/python/threadpool/ |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
33 |
""" |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
34 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
35 |
__all__ = [ |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
36 |
'makeRequests', |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
37 |
'NoResultsPending', |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
38 |
'NoWorkersAvailable', |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
39 |
'ThreadPool', |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
40 |
'WorkRequest', |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
41 |
'WorkerThread' |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
42 |
] |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
43 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
44 |
__author__ = "Christopher Arndt" |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
45 |
__version__ = "1.2.3" |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
46 |
__revision__ = "$Revision: 1.5 $" |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
47 |
__date__ = "$Date: 2006/06/23 12:32:25 $" |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
48 |
__license__ = 'Python license' |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
49 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
50 |
# standard library modules |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
51 |
import sys |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
52 |
import threading |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
53 |
import Queue |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
54 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
55 |
# exceptions |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
56 |
class NoResultsPending(Exception): |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
57 |
"""All work requests have been processed.""" |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
58 |
pass |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
59 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
60 |
class NoWorkersAvailable(Exception): |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
61 |
"""No worker threads available to process remaining requests.""" |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
62 |
pass |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
63 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
64 |
# classes |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
65 |
class WorkerThread(threading.Thread): |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
66 |
"""Background thread connected to the requests/results queues. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
67 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
68 |
A worker thread sits in the background and picks up work requests from |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
69 |
one queue and puts the results in another until it is dismissed. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
70 |
""" |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
71 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
72 |
def __init__(self, requestsQueue, resultsQueue, **kwds): |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
73 |
"""Set up thread in daemonic mode and start it immediatedly. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
74 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
75 |
requestsQueue and resultQueue are instances of Queue.Queue passed |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
76 |
by the ThreadPool class when it creates a new worker thread. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
77 |
""" |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
78 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
79 |
threading.Thread.__init__(self, **kwds) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
80 |
self.setDaemon(1) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
81 |
self.workRequestQueue = requestsQueue |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
82 |
self.resultQueue = resultsQueue |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
83 |
self._dismissed = threading.Event() |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
84 |
self.start() |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
85 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
86 |
def run(self): |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
87 |
"""Repeatedly process the job queue until told to exit.""" |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
88 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
89 |
while not self._dismissed.isSet(): |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
90 |
# thread blocks here, if queue empty |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
91 |
request = self.workRequestQueue.get() |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
92 |
if self._dismissed.isSet(): |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
93 |
# if told to exit, return the work request we just picked up |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
94 |
self.workRequestQueue.put(request) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
95 |
break # and exit |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
96 |
try: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
97 |
self.resultQueue.put( |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
98 |
(request, request.callable(*request.args, **request.kwds)) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
99 |
) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
100 |
except: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
101 |
request.exception = True |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
102 |
self.resultQueue.put((request, sys.exc_info())) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
103 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
104 |
def dismiss(self): |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
105 |
"""Sets a flag to tell the thread to exit when done with current job. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
106 |
""" |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
107 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
108 |
self._dismissed.set() |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
109 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
110 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
111 |
class WorkRequest: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
112 |
"""A request to execute a callable for putting in the request queue later. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
113 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
114 |
See the module function makeRequests() for the common case |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
115 |
where you want to build several WorkRequests for the same callable |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
116 |
but with different arguments for each call. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
117 |
""" |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
118 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
119 |
def __init__(self, callable, args=None, kwds=None, requestID=None, |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
120 |
callback=None, exc_callback=None): |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
121 |
"""Create a work request for a callable and attach callbacks. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
122 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
123 |
A work request consists of the a callable to be executed by a |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
124 |
worker thread, a list of positional arguments, a dictionary |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
125 |
of keyword arguments. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
126 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
127 |
A callback function can be specified, that is called when the results |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
128 |
of the request are picked up from the result queue. It must accept |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
129 |
two arguments, the request object and the results of the callable, |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
130 |
in that order. If you want to pass additional information to the |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
131 |
callback, just stick it on the request object. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
132 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
133 |
You can also give a callback for when an exception occurs. It should |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
134 |
also accept two arguments, the work request and a tuple with the |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
135 |
exception details as returned by sys.exc_info(). |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
136 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
137 |
requestID, if given, must be hashable since it is used by the |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
138 |
ThreadPool object to store the results of that work request in a |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
139 |
dictionary. It defaults to the return value of id(self). |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
140 |
""" |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
141 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
142 |
if requestID is None: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
143 |
self.requestID = id(self) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
144 |
else: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
145 |
try: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
146 |
hash(requestID) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
147 |
except TypeError: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
148 |
raise TypeError("requestID must be hashable.") |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
149 |
self.requestID = requestID |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
150 |
self.exception = False |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
151 |
self.callback = callback |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
152 |
self.exc_callback = exc_callback |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
153 |
self.callable = callable |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
154 |
self.args = args or [] |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
155 |
self.kwds = kwds or {} |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
156 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
157 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
158 |
class ThreadPool: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
159 |
"""A thread pool, distributing work requests and collecting results. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
160 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
161 |
See the module doctring for more information. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
162 |
""" |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
163 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
164 |
def __init__(self, num_workers, q_size=0): |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
165 |
"""Set up the thread pool and start num_workers worker threads. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
166 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
167 |
num_workers is the number of worker threads to start initialy. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
168 |
If q_size > 0 the size of the work request queue is limited and |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
169 |
the thread pool blocks when the queue is full and it tries to put |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
170 |
more work requests in it (see putRequest method). |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
171 |
""" |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
172 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
173 |
self.requestsQueue = Queue.Queue(q_size) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
174 |
self.resultsQueue = Queue.Queue() |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
175 |
self.workers = [] |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
176 |
self.workRequests = {} |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
177 |
self.createWorkers(num_workers) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
178 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
179 |
def createWorkers(self, num_workers): |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
180 |
"""Add num_workers worker threads to the pool.""" |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
181 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
182 |
for i in range(num_workers): |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
183 |
self.workers.append(WorkerThread(self.requestsQueue, |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
184 |
self.resultsQueue)) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
185 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
186 |
def dismissWorkers(self, num_workers): |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
187 |
"""Tell num_workers worker threads to quit after their current task. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
188 |
""" |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
189 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
190 |
for i in range(min(num_workers, len(self.workers))): |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
191 |
worker = self.workers.pop() |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
192 |
worker.dismiss() |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
193 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
194 |
def addWork(self, callable, args=None, kwds=None, requestID=None, callback=None, exc_callback=None, block=True, timeout=0): |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
195 |
request = WorkRequest(callable, args, kwds, requestID, callback, exc_callback) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
196 |
self.putRequest(request, block, timeout) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
197 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
198 |
def putRequest(self, request, block=True, timeout=0): |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
199 |
"""Put work request into work queue and save its id for later.""" |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
200 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
201 |
assert isinstance(request, WorkRequest) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
202 |
self.requestsQueue.put(request, block, timeout) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
203 |
self.workRequests[request.requestID] = request |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
204 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
205 |
def poll(self, block=False): |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
206 |
"""Process any new results in the queue.""" |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
207 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
208 |
while True: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
209 |
# still results pending? |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
210 |
if not self.workRequests: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
211 |
raise NoResultsPending |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
212 |
# are there still workers to process remaining requests? |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
213 |
elif block and not self.workers: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
214 |
raise NoWorkersAvailable |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
215 |
try: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
216 |
# get back next results |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
217 |
request, result = self.resultsQueue.get(block=block) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
218 |
# has an exception occured? |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
219 |
if request.exception and request.exc_callback: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
220 |
request.exc_callback(request, result) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
221 |
# hand results to callback, if any |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
222 |
if request.callback and not \ |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
223 |
(request.exception and request.exc_callback): |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
224 |
request.callback(request, result) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
225 |
del self.workRequests[request.requestID] |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
226 |
except Queue.Empty: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
227 |
break |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
228 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
229 |
def wait(self): |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
230 |
"""Wait for results, blocking until all have arrived.""" |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
231 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
232 |
while 1: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
233 |
try: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
234 |
self.poll(True) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
235 |
except NoResultsPending: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
236 |
break |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
237 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
238 |
# helper functions |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
239 |
def makeRequests(callable, args_list, callback=None, exc_callback=None): |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
240 |
"""Create several work requests for same callable with different arguments. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
241 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
242 |
Convenience function for creating several work requests for the same |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
243 |
callable where each invocation of the callable receives different values |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
244 |
for its arguments. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
245 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
246 |
args_list contains the parameters for each invocation of callable. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
247 |
Each item in 'args_list' should be either a 2-item tuple of the list of |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
248 |
positional arguments and a dictionary of keyword arguments or a single, |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
249 |
non-tuple argument. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
250 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
251 |
See docstring for WorkRequest for info on callback and exc_callback. |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
252 |
""" |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
253 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
254 |
requests = [] |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
255 |
for item in args_list: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
256 |
if isinstance(item, tuple): |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
257 |
requests.append( |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
258 |
WorkRequest(callable, item[0], item[1], callback=callback, |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
259 |
exc_callback=exc_callback) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
260 |
) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
261 |
else: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
262 |
requests.append( |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
263 |
WorkRequest(callable, [item], None, callback=callback, |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
264 |
exc_callback=exc_callback) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
265 |
) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
266 |
return requests |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
267 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
268 |
################ |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
269 |
# USAGE EXAMPLE |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
270 |
################ |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
271 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
272 |
if __name__ == '__main__': |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
273 |
import random |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
274 |
import time |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
275 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
276 |
# the work the threads will have to do (rather trivial in our example) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
277 |
def do_something(data): |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
278 |
time.sleep(random.randint(1, 5)) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
279 |
result = round(random.random() * data, 5) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
280 |
# just to show off, we throw an exception once in a while |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
281 |
if result > 3: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
282 |
raise RuntimeError("Something extraordinary happened!") |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
283 |
return result |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
284 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
285 |
# this will be called each time a result is available |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
286 |
def print_result(request, result): |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
287 |
print "**Result: %s from request #%s" % (result, request.requestID) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
288 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
289 |
# this will be called when an exception occurs within a thread |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
290 |
def handle_exception(request, exc_info): |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
291 |
print "Exception occured in request #%s: %s" % \ |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
292 |
(request.requestID, exc_info[1]) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
293 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
294 |
# assemble the arguments for each job to a list... |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
295 |
data = [random.randint(1, 10) for i in range(20)] |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
296 |
# ... and build a WorkRequest object for each item in data |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
297 |
requests = makeRequests(do_something, data, print_result, handle_exception) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
298 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
299 |
# or the other form of args_lists accepted by makeRequests: ((,), {}) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
300 |
data = [((random.randint(1, 10), ), {}) for i in range(20)] |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
301 |
requests.extend( |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
302 |
makeRequests(do_something, data, print_result, handle_exception) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
303 |
) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
304 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
305 |
# we create a pool of 3 worker threads |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
306 |
main = ThreadPool(3) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
307 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
308 |
# then we put the work requests in the queue... |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
309 |
for req in requests: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
310 |
main.putRequest(req) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
311 |
print "Work request #%s added." % req.requestID |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
312 |
# or shorter: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
313 |
# [main.putRequest(req) for req in requests] |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
314 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
315 |
# ...and wait for the results to arrive in the result queue |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
316 |
# by using ThreadPool.wait(). This would block until results for |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
317 |
# all work requests have arrived: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
318 |
# main.wait() |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
319 |
|
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
320 |
# instead we can poll for results while doing something else: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
321 |
i = 0 |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
322 |
while 1: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
323 |
try: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
324 |
main.poll() |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
325 |
print "Main thread working..." |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
326 |
time.sleep(0.5) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
327 |
if i == 10: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
328 |
print "Adding 3 more worker threads..." |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
329 |
main.createWorkers(3) |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
330 |
i += 1 |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
331 |
except KeyboardInterrupt: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
332 |
print "Interrupted!" |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
333 |
break |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
334 |
except NoResultsPending: |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
335 |
print "All results collected." |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
336 |
break |
be27ed110b50
Bringing in Helium, imaker and cmaker
Alex Gilkes <alex.gilkes@nokia.com>
parents:
diff
changeset
|
337 |