Interface improvement for cached object (inkl. example adaption)

__init__.py

@@ -28,7 +28,6 @@ import json
 import logging
 import os
 import pickle
-import sys
 import time
 
 try:
@@ -53,6 +52,9 @@ class property_cache_pickle(object):
     :param cache_filename: File name, where the properties are stored as cache
     :type cache_filename: str
     :param load_all_on_init: Optionally init behaviour control parameter. True will load all available properties from source on init, False not.
+    :param max_age: The maximum age of the cache object, after that time the source will be used for getting information.
+    :type max_age: int
+    :param store_on_get: Parameter to enable / disable cache storage on get. If you disble data storage, you need to update and store the cache manually
 
     .. note:: source_instance needs to have at least the following methods: uid(), keys(), data_version(), get()
 
@@ -94,6 +96,8 @@ class property_cache_pickle(object):
         self._callback_on_data_storage = callback_on_data_storage
         self._max_age = max_age
         self._store_on_get = store_on_get
+        #
+        self._source_get_keys = []
         self._cached_props = None
 
     def get(self, key, default=None):
@@ -104,7 +108,7 @@ class property_cache_pickle(object):
         :param default: value to be returned, if key does not exists.
         :returns: value for a given key or default value.
         """
-        if key in self.keys():
+        if key in self.keys() and key not in self._source_get_keys:
             if self._cached_props is None:
                 self._init_cache()
             if self._max_age is None:
@@ -198,8 +202,9 @@ class property_cache_pickle(object):
     def _load_source(self):
         if self._cached_props is None:
             self._init_cache()
-        logger.debug('%s Loading all data from source - %s', self.LOG_PREFIX, repr(self._source_instance.keys()))
+        logger.debug('%s Loading all data from source - %s', self.LOG_PREFIX, repr(self.keys()))
-        for key in self._source_instance.keys():
+        for key in self.keys():
+            if key not in self._source_get_keys:
                 self._cached_props[self.DATA_TAG][self._key_filter(key)] = self._source_instance.get(key)
                 self._cached_props[self.AGE_TAG][self._key_filter(key)] = int(time.time())
 
@@ -216,6 +221,18 @@ class property_cache_pickle(object):
         else:
             return self._cached_props.get(self.UID_TAG, None)
 
+    def add_source_get_keys(self, keys):
+        if type(keys) in [list, tuple]:
+            self._source_get_keys.extend(keys)
+        else:
+            self._source_get_keys.append(keys)
+
+    def __getattribute__(self, name):
+        try:
+            return super().__getattribute__(name)
+        except AttributeError:
+            return getattr(self._source_instance, name)
+
 
 class property_cache_json(property_cache_pickle):
     """
@@ -226,6 +243,9 @@ class property_cache_json(property_cache_pickle):
     :param cache_filename: File name, where the properties are stored as cache
     :type cache_filename: str
     :param load_all_on_init: Optionally init behaviour control parameter. True will load all available properties from source on init, False not.
+    :param max_age: The maximum age of the cache object, after that time the source will be used for getting information.
+    :type max_age: int
+    :param store_on_get: Parameter to enable / disable cache storage on get. If you disble data storage, you need to update and store the cache manually
 
     .. warning::
         * This class uses json. You should **only** use keys of type string!

_examples_/property_cache_json.py

@@ -2,62 +2,31 @@
 # -*- coding: UTF-8 -*-
 
 import sys
-import time
 sys.path.append('../..')
-
-import caching
 import report
+import caching
+import time
 
 
 report.stdoutLoggingConfigure(log_name_lvl=[('root', 'DEBUG'), ])
 
 
 class test_slow_data(object):
-    _ONE = '1'
+    DATA_VERSION = 0.1
-    _TWO = '2'
+    KEY_ONE = '1'
-    _THREE = '_property_cache_data_version_'
+    KEY_TWO = '2'
-    _FOUR = '_property_cache_uid_'
+    KEY_THREE = 'three'
-    _FIVE = '__property_cache_uid_'
+    KEY_FOUR = 'four'
-    KEYS = [_ONE, _TWO, _THREE, _FOUR, _FIVE]
+    KEY_FIVE = 'five'
-    VERS = 0.1
+    KEYS = [KEY_ONE, KEY_TWO, KEY_THREE, KEY_FOUR, KEY_FIVE]
 
     def data_version(self):
-        return self.VERS
+        return self.DATA_VERSION
-
-    def one(self):
-        return self.get(self._ONE)
-
-    def two(self):
-        return self.get(self._TWO)
-
-    def three(self):
-        return self.get(self._THREE)
-
-    def four(self):
-        return self.get(self._FOUR)
-
-    def five(self):
-        return self.get(self._FIVE)
 
     def get(self, key, default=None):
-        def print_n_sleep(k):
+        try:
-            sys.stdout.write('slow get executed for %s\n' % k)
+            return getattr(self, f'__{key}__')()
-            time.sleep(3)
+        except AttributeError:
-        if key == self._ONE:
-            print_n_sleep(key)
-            return 'one'
-        if key == self._TWO:
-            print_n_sleep(key)
-            return 'two'
-        if key == self._THREE:
-            print_n_sleep(key)
-            return 'three'
-        if key == self._FOUR:
-            print_n_sleep(key)
-            return 'four'
-        if key == self._FIVE:
-            print_n_sleep(key)
-            return 'five'
             return default
 
     def keys(self):
@@ -66,23 +35,35 @@ class test_slow_data(object):
     def uid(self):
         return None
 
+    def print_n_sleep(self, k):
+        sys.stdout.write('slow get executed for %s\n' % k)
+        time.sleep(3)
 
-class tsd_cache_json(test_slow_data):
+    def __1__(self):
-    def __init__(self, *args, **kwargs):
+        self.print_n_sleep("__1__")
-        test_slow_data.__init__(self, *args, **kwargs)
+        return 'one'
-        self._cached_data = caching.property_cache_json(test_slow_data(*args, **kwargs), 'cache.json', load_all_on_init=False)
 
-    def two(self):
+    def __2__(self):
-        return test_slow_data.get(self, self._TWO)
+        self.print_n_sleep("__2__")
+        return 'two'
 
-    def get(self, key, default=None):
+    def __three__(self):
-        return self._cached_data.get(key, default)
+        self.print_n_sleep("__three__")
+        return 'three'
+
+    def __four__(self):
+        self.print_n_sleep("__four__")
+        return 'four'
+
+    def __five__(self):
+        self.print_n_sleep("__five__")
+        return 'five'
 
 
-data = tsd_cache_json()
+if __name__ == "__main__":
+    data = caching.property_cache_json(test_slow_data(), 'cache.json')
+    data.add_source_get_keys(data.KEY_THREE)
     print('Testing property_cache (json):\\n--------------------------------')
-print(data.one())
+    for key in data.keys():
-print(data.two())
+        print(data.get(key))
-print(data.three())
+
-print(data.four())
-print(data.five())

_examples_/property_cache_pickle.py

@@ -2,62 +2,31 @@
 # -*- coding: UTF-8 -*-
 
 import sys
-import time
 sys.path.append('../..')
-
-import caching
 import report
+import caching
+import time
 
 
 report.stdoutLoggingConfigure(log_name_lvl=[('root', 'DEBUG'), ])
 
 
 class test_slow_data(object):
-    _ONE = '1'
+    DATA_VERSION = 0.1
-    _TWO = '2'
+    KEY_ONE = '1'
-    _THREE = '_property_cache_data_version_'
+    KEY_TWO = '2'
-    _FOUR = '_property_cache_uid_'
+    KEY_THREE = 'three'
-    _FIVE = '__property_cache_uid_'
+    KEY_FOUR = 'four'
-    KEYS = [_ONE, _TWO, _THREE, _FOUR, _FIVE]
+    KEY_FIVE = 'five'
-    VERS = 0.1
+    KEYS = [KEY_ONE, KEY_TWO, KEY_THREE, KEY_FOUR, KEY_FIVE]
 
     def data_version(self):
-        return self.VERS
+        return self.DATA_VERSION
-
-    def one(self):
-        return self.get(self._ONE)
-
-    def two(self):
-        return self.get(self._TWO)
-
-    def three(self):
-        return self.get(self._THREE)
-
-    def four(self):
-        return self.get(self._FOUR)
-
-    def five(self):
-        return self.get(self._FIVE)
 
     def get(self, key, default=None):
-        def print_n_sleep(k):
+        try:
-            sys.stdout.write('slow get executed for %s\n' % k)
+            return getattr(self, f'__{key}__')()
-            time.sleep(3)
+        except AttributeError:
-        if key == self._ONE:
-            print_n_sleep(key)
-            return 'one'
-        if key == self._TWO:
-            print_n_sleep(key)
-            return 'two'
-        if key == self._THREE:
-            print_n_sleep(key)
-            return 'three'
-        if key == self._FOUR:
-            print_n_sleep(key)
-            return 'four'
-        if key == self._FIVE:
-            print_n_sleep(key)
-            return 'five'
             return default
 
     def keys(self):
@@ -66,23 +35,35 @@ class test_slow_data(object):
     def uid(self):
         return None
 
+    def print_n_sleep(self, k):
+        sys.stdout.write('slow get executed for %s\n' % k)
+        time.sleep(3)
 
-class tsd_cache_pickle(test_slow_data):
+    def __1__(self):
-    def __init__(self, *args, **kwargs):
+        self.print_n_sleep("__1__")
-        test_slow_data.__init__(self, *args, **kwargs)
+        return 'one'
-        self._cached_data = caching.property_cache_pickle(test_slow_data(*args, **kwargs), 'cache.pickle', load_all_on_init=False)
 
-    def two(self):
+    def __2__(self):
-        return test_slow_data.get(self, self._TWO)
+        self.print_n_sleep("__2__")
+        return 'two'
 
-    def get(self, key, default=None):
+    def __three__(self):
-        return self._cached_data.get(key, default)
+        self.print_n_sleep("__three__")
+        return 'three'
+
+    def __four__(self):
+        self.print_n_sleep("__four__")
+        return 'four'
+
+    def __five__(self):
+        self.print_n_sleep("__five__")
+        return 'five'
 
 
-data = tsd_cache_pickle()
+if __name__ == "__main__":
+    data = caching.property_cache_pickle(test_slow_data(), 'cache.pickle')
+    data.add_source_get_keys(data.KEY_THREE)
     print('Testing property_cache (pickle):\\n--------------------------------')
-print(data.one())
+    for key in data.keys():
-print(data.two())
+        print(data.get(key))
-print(data.three())
+
-print(data.four())
-print(data.five())