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[TEST] Add memoize to save test data (apache#424)
* [TEST] Add memoize to save test data * Update comment * mark py version
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| """Memoize result of function via pickle, used for cache testcases.""" | ||
| # pylint: disable=broad-except,superfluous-parens | ||
| import os | ||
| import sys | ||
| import atexit | ||
| from decorator import decorate | ||
| from .._ffi.base import string_types | ||
| try: | ||
| import cPickle as pickle | ||
| except ImportError: | ||
| import pickle | ||
|
|
||
| class Cache(object): | ||
| """A cache object for result cache. | ||
| Parameters | ||
| ---------- | ||
| key: str | ||
| The file key to the function | ||
| """ | ||
| cache_by_key = {} | ||
| def __init__(self, key): | ||
| cache_dir = ".pkl_memoize_py{0}".format(sys.version_info[0]) | ||
| if not os.path.exists(cache_dir): | ||
| os.mkdir(cache_dir) | ||
| self.path = os.path.join(cache_dir, key) | ||
| if os.path.exists(self.path): | ||
| try: | ||
| self.cache = pickle.load(open(self.path, "rb")) | ||
| except Exception: | ||
| self.cache = {} | ||
| else: | ||
| self.cache = {} | ||
| self.dirty = False | ||
|
|
||
| def save(self): | ||
| if self.dirty: | ||
| print("Save memoize result to %s" % self.path) | ||
| with open(self.path, "wb") as out_file: | ||
| pickle.dump(self.cache, out_file, pickle.HIGHEST_PROTOCOL) | ||
|
|
||
| @atexit.register | ||
| def _atexit(): | ||
| """Save handler.""" | ||
| for value in Cache.cache_by_key.values(): | ||
| value.save() | ||
|
|
||
|
|
||
| def memoize(key): | ||
| """Memoize the result of function and reuse multiple times. | ||
| Parameters | ||
| ---------- | ||
| key: str | ||
| The unique key to the file | ||
| Returns | ||
| ------- | ||
| fmemoize : function | ||
| The decorator function to perform memoization. | ||
| """ | ||
| def _register(f): | ||
| """Registration function""" | ||
| allow_types = (string_types, int, float) | ||
| fkey = key + "." + f.__name__ + ".pkl" | ||
| if fkey not in Cache.cache_by_key: | ||
| Cache.cache_by_key[fkey] = Cache(fkey) | ||
| cache = Cache.cache_by_key[fkey] | ||
| cargs = tuple(x.cell_contents for x in f.__closure__) | ||
| cargs = (len(cargs),) + cargs | ||
|
|
||
| def _memoized_f(func, *args, **kwargs): | ||
| assert not kwargs, "Only allow positional call" | ||
| key = cargs + args | ||
| for arg in key: | ||
| if isinstance(arg, tuple): | ||
| for x in arg: | ||
| assert isinstance(x, allow_types) | ||
| else: | ||
| assert isinstance(arg, allow_types) | ||
| if key in cache.cache: | ||
| print("Use memoize {0}{1}".format(fkey, key)) | ||
| return cache.cache[key] | ||
| res = func(*args) | ||
| cache.cache[key] = res | ||
| cache.dirty = True | ||
| return res | ||
|
|
||
| return decorate(f, _memoized_f) | ||
|
|
||
| return _register |
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