Simplified the concurrency example by using a Future class

author: Michele Simionato <michele.simionato@gmail.com> 2015-07-19 19:13:36 +0200
committer: Michele Simionato <michele.simionato@gmail.com> 2015-07-19 19:13:36 +0200
commit: a4e7a82790a134ca44746de88bdc0354e90c442c (patch)
tree: 471fc9c4775b2a3660148e4a0c77acb58bbee788 /documentation.pdf
parent: cf20ab367249c9eca473d6f9989f0721e451b033 (diff)
download: python-decorator-git-a4e7a82790a134ca44746de88bdc0354e90c442c.tar.gz
1 files changed, 722 insertions, 912 deletions
diff --git a/documentation.pdf b/documentation.pdf
index f518aac..cb3ebe6 100644
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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 .960784 .960784 .862745 rg
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-BT 1 0 0 1 0 386 Tm 12 TL /F6 10 Tf .729412 .129412 .129412 rg (    A decorator converting blocking functions into asynchronous) Tj T* (    functions, by using threads or processes. Examples:) Tj T*  T* (    async_with_threads = Async\(threading.Thread\)) Tj T* (    async_with_processes = Async\(multiprocessing.Process\)) Tj T* (    """) Tj /F3 10 Tf 0 0 0 rg  T*  T* (    ) Tj /F5 10 Tf 0 .501961 0 rg (def) Tj /F3 10 Tf 0 0 0 rg ( ) Tj 0 0 1 rg (__init__) Tj 0 0 0 rg (\() Tj 0 .501961 0 rg (self) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (threadfactory) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (on_success) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg (on_success) Tj 0 0 0 rg (,) Tj 0 0 0 rg  T* (                 ) Tj 0 0 0 rg (on_failure) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg (on_failure) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (on_closing) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg (on_closing) Tj 0 0 0 rg (\):) Tj 0 0 0 rg  T* (        ) Tj 0 .501961 0 rg (self) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (threadfactory) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (threadfactory) Tj 0 0 0 rg  T* (        ) Tj 0 .501961 0 rg (self) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (on_success) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (on_success) Tj 0 0 0 rg  T* (        ) Tj 0 .501961 0 rg (self) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (on_failure) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (on_failure) Tj 0 0 0 rg  T* (        ) Tj 0 .501961 0 rg (self) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (on_closing) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (on_closing) Tj 0 0 0 rg  T*  T* (    ) Tj /F5 10 Tf 0 .501961 0 rg (def) Tj /F3 10 Tf 0 0 0 rg ( ) Tj 0 0 1 rg (__call__) Tj 0 0 0 rg (\() Tj 0 .501961 0 rg (self) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (func) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (*) Tj 0 0 0 rg (args) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (**) Tj 0 0 0 rg (kw) Tj 0 0 0 rg (\):) Tj 0 0 0 rg  T* (        ) Tj /F5 10 Tf 0 .501961 0 rg (try) Tj /F3 10 Tf 0 0 0 rg (:) Tj 0 0 0 rg  T* (            ) Tj 0 0 0 rg (counter) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (func) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (counter) Tj 0 0 0 rg  T* (        ) Tj /F5 10 Tf 0 .501961 0 rg (except) Tj /F3 10 Tf 0 0 0 rg ( ) Tj /F5 10 Tf .823529 .254902 .227451 rg (AttributeError) Tj /F3 10 Tf 0 0 0 rg (:) Tj 0 0 0 rg (  ) Tj /F6 10 Tf .25098 .501961 .501961 rg (# instantiate the counter at the first call) Tj /F3 10 Tf 0 0 0 rg  T* (            ) Tj 0 0 0 rg (counter) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (func) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (counter) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (itertools) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (count) Tj 0 0 0 rg (\() Tj .4 .4 .4 rg (1) Tj 0 0 0 rg (\)) Tj 0 0 0 rg  T* (        ) Tj 0 0 0 rg (name) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg ( ) Tj .729412 .129412 .129412 rg (') Tj /F5 10 Tf .733333 .4 .533333 rg (%s) Tj /F3 10 Tf .729412 .129412 .129412 rg (-) Tj /F5 10 Tf .733333 .4 .533333 rg (%s) Tj /F3 10 Tf .729412 .129412 .129412 rg (') Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (%) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (\() Tj 0 0 0 rg (func) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (__name__) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj 0 .501961 0 rg (next) Tj 0 0 0 rg (\() Tj 0 0 0 rg (counter) Tj 0 0 0 rg (\)\)) Tj 0 0 0 rg  T*  T* (        ) Tj /F5 10 Tf 0 .501961 0 rg (def) Tj /F3 10 Tf 0 0 0 rg ( ) Tj 0 0 1 rg (func_wrapper) Tj 0 0 0 rg (\(\):) Tj 0 0 0 rg  T* (            ) Tj /F5 10 Tf 0 .501961 0 rg (try) Tj /F3 10 Tf 0 0 0 rg (:) Tj 0 0 0 rg  T* (                ) Tj 0 0 0 rg (result) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (func) Tj 0 0 0 rg (\() Tj .4 .4 .4 rg (*) Tj 0 0 0 rg (args) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (**) Tj 0 0 0 rg (kw) Tj 0 0 0 rg (\)) Tj 0 0 0 rg  T* (            ) Tj /F5 10 Tf 0 .501961 0 rg (except) Tj /F3 10 Tf 0 0 0 rg (:) Tj 0 0 0 rg  T* (                ) Tj 0 .501961 0 rg (self) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (on_failure) Tj 0 0 0 rg (\() Tj 0 0 0 rg (sys) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (exc_info) Tj 0 0 0 rg (\(\)\)) Tj 0 0 0 rg  T* (            ) Tj /F5 10 Tf 0 .501961 0 rg (else) Tj /F3 10 Tf 0 0 0 rg (:) Tj 0 0 0 rg  T* (                ) Tj /F5 10 Tf 0 .501961 0 rg (return) Tj /F3 10 Tf 0 0 0 rg ( ) Tj 0 .501961 0 rg (self) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (on_success) Tj 0 0 0 rg (\() Tj 0 0 0 rg (result) Tj 0 0 0 rg (\)) Tj 0 0 0 rg  T* (            ) Tj /F5 10 Tf 0 .501961 0 rg (finally) Tj /F3 10 Tf 0 0 0 rg (:) Tj 0 0 0 rg  T* (                ) Tj 0 .501961 0 rg (self) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (on_closing) Tj 0 0 0 rg (\(\)) Tj 0 0 0 rg  T* (        ) Tj 0 0 0 rg (thread) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg ( ) Tj 0 .501961 0 rg (self) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (threadfactory) Tj 0 0 0 rg (\() Tj 0 .501961 0 rg (None) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (func_wrapper) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (name) Tj 0 0 0 rg (\)) Tj 0 0 0 rg  T* (        ) Tj 0 0 0 rg (thread) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (start) Tj 0 0 0 rg (\(\)) Tj 0 0 0 rg  T* (        ) Tj /F5 10 Tf 0 .501961 0 rg (return) Tj /F3 10 Tf 0 0 0 rg ( ) Tj 0 0 0 rg (thread) Tj T* ET
+n 120 0 42 12 re f*
+BT 1 0 0 1 0 230 Tm 12 TL /F5 10 Tf 0 .501961 0 rg (class) Tj /F3 10 Tf 0 0 0 rg ( ) Tj /F5 10 Tf 0 0 1 rg (Future) Tj /F3 10 Tf 0 0 0 rg (\() Tj 0 0 0 rg (threading) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (Thread) Tj 0 0 0 rg (\):) Tj 0 0 0 rg  T* (    ) Tj /F6 10 Tf .729412 .129412 .129412 rg (""") Tj T* (    A class converting blocking functions into asynchronous) Tj T* (    functions by using threads.) Tj T* (    """) Tj /F3 10 Tf 0 0 0 rg  T* (    ) Tj /F5 10 Tf 0 .501961 0 rg (def) Tj /F3 10 Tf 0 0 0 rg ( ) Tj 0 0 1 rg (__init__) Tj 0 0 0 rg (\() Tj 0 .501961 0 rg (self) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (func) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (*) Tj 0 0 0 rg (args) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (**) Tj 0 0 0 rg (kw) Tj 0 0 0 rg (\):) Tj 0 0 0 rg  T* (        ) Tj /F5 10 Tf 0 .501961 0 rg (try) Tj /F3 10 Tf 0 0 0 rg (:) Tj 0 0 0 rg  T* (            ) Tj 0 0 0 rg (counter) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (func) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (counter) Tj 0 0 0 rg  T* (        ) Tj /F5 10 Tf 0 .501961 0 rg (except) Tj /F3 10 Tf 0 0 0 rg ( ) Tj /F5 10 Tf .823529 .254902 .227451 rg (AttributeError) Tj /F3 10 Tf 0 0 0 rg (:) Tj 0 0 0 rg (  ) Tj /F6 10 Tf .25098 .501961 .501961 rg (# instantiate the counter at the first call) Tj /F3 10 Tf 0 0 0 rg  T* (            ) Tj 0 0 0 rg (counter) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (func) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (counter) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (itertools) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (count) Tj 0 0 0 rg (\() Tj .4 .4 .4 rg (1) Tj 0 0 0 rg (\)) Tj 0 0 0 rg  T* (        ) Tj 0 0 0 rg (name) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg ( ) Tj .729412 .129412 .129412 rg (') Tj /F5 10 Tf .733333 .4 .533333 rg (%s) Tj /F3 10 Tf .729412 .129412 .129412 rg (-) Tj /F5 10 Tf .733333 .4 .533333 rg (%s) Tj /F3 10 Tf .729412 .129412 .129412 rg (') Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (%) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (\() Tj 0 0 0 rg (func) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (__name__) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj 0 .501961 0 rg (next) Tj 0 0 0 rg (\() Tj 0 0 0 rg (counter) Tj 0 0 0 rg (\)\)) Tj 0 0 0 rg  T*  T* (        ) Tj /F5 10 Tf 0 .501961 0 rg (def) Tj /F3 10 Tf 0 0 0 rg ( ) Tj 0 0 1 rg (func_wrapper) Tj 0 0 0 rg (\(\):) Tj 0 0 0 rg  T* (            ) Tj 0 .501961 0 rg (self) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (_result) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (func) Tj 0 0 0 rg (\() Tj .4 .4 .4 rg (*) Tj 0 0 0 rg (args) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj .4 .4 .4 rg (**) Tj 0 0 0 rg (kw) Tj 0 0 0 rg (\)) Tj 0 0 0 rg  T* (        ) Tj 0 .501961 0 rg (super) Tj 0 0 0 rg (\() Tj 0 0 0 rg (Future) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj 0 .501961 0 rg (self) Tj 0 0 0 rg (\)) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (__init__) Tj 0 0 0 rg (\() Tj 0 0 0 rg (target) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg (func_wrapper) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (name) Tj .4 .4 .4 rg (=) Tj 0 0 0 rg (name) Tj 0 0 0 rg (\)) Tj 0 0 0 rg  T* (        ) Tj 0 .501961 0 rg (self) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (start) Tj 0 0 0 rg (\(\)) Tj 0 0 0 rg  T*  T* (    ) Tj /F5 10 Tf 0 .501961 0 rg (def) Tj /F3 10 Tf 0 0 0 rg ( ) Tj 0 0 1 rg (result) Tj 0 0 0 rg (\() Tj 0 .501961 0 rg (self) Tj 0 0 0 rg (\):) Tj 0 0 0 rg  T* (        ) Tj 0 .501961 0 rg (self) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (join) Tj 0 0 0 rg (\(\)) Tj 0 0 0 rg  T* (        ) Tj /F5 10 Tf 0 .501961 0 rg (return) Tj /F3 10 Tf 0 0 0 rg ( ) Tj 0 .501961 0 rg (self) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (_result) Tj T* ET
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+ 
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+101 0 obj
+<< /Length 16187 >>
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+1 0 0 1 0 0 cm  BT /F1 12 Tf 14.4 TL ET
 q
-1 0 0 1 62.69291 323.8236 cm
+1 0 0 1 62.69291 741.0236 cm
 q
-BT 1 0 0 1 0 14 Tm .865984 Tw 12 TL /F1 10 Tf 0 0 0 rg (The decorated function returns the current execution thread, which can be stored and checked later, for) Tj T* 0 Tw (instance to verify that the thread ) Tj /F3 10 Tf 0 0 0 rg (.isAlive\(\)) Tj /F1 10 Tf 0 0 0 rg (.) Tj T* ET
+BT 1 0 0 1 0 14 Tm .143984 Tw 12 TL /F1 10 Tf 0 0 0 rg (The decorated function returns a ) Tj /F3 10 Tf 0 0 0 rg (Future ) Tj /F1 10 Tf 0 0 0 rg (object, which has a ) Tj /F3 10 Tf 0 0 0 rg (.result\(\) ) Tj /F1 10 Tf 0 0 0 rg (method which blocks until the) Tj T* 0 Tw (underlying thread finishes and returns the final result.) Tj T* ET
 Q
 Q
 q
-1 0 0 1 62.69291 281.8236 cm
+1 0 0 1 62.69291 699.0236 cm
 q
 0 0 0 rg
-BT 1 0 0 1 0 26 Tm /F1 10 Tf 12 TL .691654 Tw (Here is an example of usage. Suppose one wants to write some data to an external resource which can) Tj T* 0 Tw .21683 Tw (be accessed by a single user at once \(for instance a printer\). Then the access to the writing function must) Tj T* 0 Tw (be locked. Here is a minimalistic example:) Tj T* ET
+BT 1 0 0 1 0 26 Tm /F1 10 Tf 12 TL .128409 Tw (Suppose one wants to write some data to an external resource which can be accessed by a single user at) Tj T* 0 Tw .076654 Tw (once \(for instance a printer\). Then the access to the writing function must be locked. Here is a minimalistic) Tj T* 0 Tw (example:) Tj T* ET
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-1 0 0 1 62.69291 128.6236 cm
+1 0 0 1 62.69291 545.8236 cm
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@@ -4056,17 +3827,9 @@ n 72 120 54 12 re f*
 .960784 .960784 .862745 rg
 n 126 120 6 12 re f*
 .960784 .960784 .862745 rg
-n 132 120 30 12 re f*
-.960784 .960784 .862745 rg
-n 162 120 6 12 re f*
-.960784 .960784 .862745 rg
-n 168 120 54 12 re f*
-.960784 .960784 .862745 rg
-n 222 120 6 12 re f*
+n 132 120 36 12 re f*
 .960784 .960784 .862745 rg
-n 228 120 36 12 re f*
-.960784 .960784 .862745 rg
-n 264 120 12 12 re f*
+n 168 120 6 12 re f*
 .960784 .960784 .862745 rg
 n 0 96 6 12 re f*
 .960784 .960784 .862745 rg
@@ -4151,27 +3914,20 @@ n 192 12 6 12 re f*
 n 0 0 18 12 re f*
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-BT 1 0 0 1 0 134 Tm 12 TL /F3 10 Tf .4 .4 .4 rg (>) Tj (>) Tj (>) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (write) Tj 0 0 0 rg (\() Tj .729412 .129412 .129412 rg ("data1") Tj 0 0 0 rg (\)) Tj 0 0 0 rg  T* .4 .4 .4 rg (<) Tj 0 0 0 rg (Thread) Tj 0 0 0 rg (\() Tj 0 0 0 rg (write) Tj .4 .4 .4 rg (-) Tj .4 .4 .4 rg (1) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (started) Tj .4 .4 .4 rg (...) Tj 0 0 0 rg (\)) Tj .4 .4 .4 rg (>) Tj 0 0 0 rg  T*  T* .4 .4 .4 rg (>) Tj (>) Tj (>) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (time) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (sleep) Tj 0 0 0 rg (\() Tj .4 .4 .4 rg (.) Tj .4 .4 .4 rg (1) Tj 0 0 0 rg (\)) Tj 0 0 0 rg ( ) Tj /F6 10 Tf .25098 .501961 .501961 rg (# wait a bit, so we are sure data2 is written after data1) Tj /F3 10 Tf 0 0 0 rg  T*  T* .4 .4 .4 rg (>) Tj (>) Tj (>) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (write) Tj 0 0 0 rg (\() Tj .729412 .129412 .129412 rg ("data2") Tj 0 0 0 rg (\)) Tj 0 0 0 rg  T* .4 .4 .4 rg (<) Tj 0 0 0 rg (Thread) Tj 0 0 0 rg (\() Tj 0 0 0 rg (write) Tj .4 .4 .4 rg (-) Tj .4 .4 .4 rg (2) Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (started) Tj .4 .4 .4 rg (...) Tj 0 0 0 rg (\)) Tj .4 .4 .4 rg (>) Tj 0 0 0 rg  T*  T* .4 .4 .4 rg (>) Tj (>) Tj (>) Tj 0 0 0 rg ( ) Tj 0 0 0 rg (time) Tj .4 .4 .4 rg (.) Tj 0 0 0 rg (sleep) Tj 0 0 0 rg (\() Tj .4 .4 .4 rg (2) Tj 0 0 0 rg (\)) Tj 0 0 0 rg ( ) Tj /F6 10 Tf .25098 .501961 .501961 rg (# wait for the writers to complete) Tj /F3 10 Tf 0 0 0 rg  T*  T* .4 .4 .4 rg (>) Tj (>) Tj (>) Tj 0 0 0 rg ( ) Tj /F5 10 Tf 0 .501961 0 rg (print) Tj /F3 10 Tf 0 0 0 rg (\() Tj 0 0 0 rg (datalist) Tj 0 0 0 rg (\)) Tj 0 0 0 rg  T* 0 0 0 rg ([) Tj .729412 .129412 .129412 rg ('data1') Tj 0 0 0 rg (,) Tj 0 0 0 rg ( ) Tj .729412 .129412 .129412 rg ('data2') Tj 0 0 0 rg (]) Tj T* ET
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+BT 1 0 0 1 0 110 Tm .20561 Tw 12 TL /F1 10 Tf 0 0 0 rg (The ) Tj /F3 10 Tf 0 0 0 rg (ba ) Tj /F1 10 Tf 0 0 0 rg (decorator is basically inserting a ) Tj /F3 10 Tf 0 0 0 rg (with) Tj ( ) Tj (ba: ) Tj /F1 10 Tf 0 0 0 rg (block inside the function. However there two issues:) Tj T* 0 Tw 1.402126 Tw (the first is that ) Tj /F3 10 Tf 0 0 0 rg (GeneratorContextManager ) Tj /F1 10 Tf 0 0 0 rg (objects are callable only in Python 3.2, so the previous) Tj T* 0 Tw .356905 Tw (example will break in older versions of Python; the second is that ) Tj /F3 10 Tf 0 0 0 rg (GeneratorContextManager ) Tj /F1 10 Tf 0 0 0 rg (objects) Tj T* 0 Tw .57561 Tw (do not preserve the signature of the decorated functions: the decorated ) Tj /F3 10 Tf 0 0 0 rg (hello ) Tj /F1 10 Tf 0 0 0 rg (function here will have a) Tj T* 0 Tw 3.990814 Tw (generic signature ) Tj /F3 10 Tf 0 0 0 rg (hello\(*args,) Tj ( ) Tj (**kwargs\) ) Tj /F1 10 Tf 0 0 0 rg (but will break when called with more than zero) Tj T* 0 Tw 7.708314 Tw (arguments. For such reasons the decorator module, starting with release 3.4, offers a) Tj T* 0 Tw 1.027251 Tw /F3 10 Tf 0 0 0 rg (decorator.contextmanager ) Tj /F1 10 Tf 0 0 0 rg (decorator that solves both problems and works in all supported Python) Tj T* 0 Tw 2.85816 Tw (versions. The usage is the same and factories decorated with ) Tj /F3 10 Tf 0 0 0 rg (decorator.contextmanager ) Tj /F1 10 Tf 0 0 0 rg (will) Tj T* 0 Tw .17122 Tw (returns instances of ) Tj /F3 10 Tf 0 0 0 rg (ContextManager) Tj /F1 10 Tf 0 0 0 rg (, a subclass of ) Tj /F3 10 Tf 0 0 0 rg (contextlib.GeneratorContextManager ) Tj /F1 10 Tf 0 0 0 rg (with) Tj T* 0 Tw (a ) Tj /F3 10 Tf 0 0 0 rg (__call__ ) Tj /F1 10 Tf 0 0 0 rg (method acting as a signature-preserving decorator.) Tj T* ET
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author	Michele Simionato <michele.simionato@gmail.com>	2015-07-19 19:13:36 +0200
committer	Michele Simionato <michele.simionato@gmail.com>	2015-07-19 19:13:36 +0200
commit	a4e7a82790a134ca44746de88bdc0354e90c442c (patch)
tree	471fc9c4775b2a3660148e4a0c77acb58bbee788 /documentation.pdf
parent	cf20ab367249c9eca473d6f9989f0721e451b033 (diff)
download	python-decorator-git-a4e7a82790a134ca44746de88bdc0354e90c442c.tar.gz