File size: 6,192 Bytes
476455e | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 | # Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
# ANY KIND, either express or implied. See the License for the specific
# language governing permissions and limitations under the License.
from __future__ import absolute_import
from typing import Optional, Union
from mock.mock import MagicMock, patch
import pytest
from sagemaker.utilities import cache
import datetime
def retrieval_function(key: Optional[int] = None, value: Optional[str] = None) -> str:
return str(hash(str(key)))
def test_cache_retrieves_item():
my_cache = cache.LRUCache[int, Union[int, str]](
max_cache_items=10,
expiration_horizon=datetime.timedelta(hours=1),
retrieval_function=retrieval_function,
)
my_cache.put(5)
assert my_cache.get(5, False) == retrieval_function(key=5)
my_cache.put(6, 7)
assert my_cache.get(6, False) == 7
assert len(my_cache) == 2
my_cache.put(5, 6)
assert my_cache.get(5, False) == 6
assert len(my_cache) == 2
with pytest.raises(KeyError):
my_cache.get(21, False)
def test_cache_invalidates_old_item():
my_cache = cache.LRUCache[int, Union[int, str]](
max_cache_items=10,
expiration_horizon=datetime.timedelta(milliseconds=1),
retrieval_function=retrieval_function,
)
mock_curr_time = datetime.datetime.fromtimestamp(1636730651.079551)
with patch("datetime.datetime") as mock_datetime:
mock_datetime.now.return_value = mock_curr_time
my_cache.put(5)
mock_datetime.now.return_value += datetime.timedelta(milliseconds=2)
with pytest.raises(KeyError):
my_cache.get(5, False)
with patch("datetime.datetime") as mock_datetime:
mock_datetime.now.return_value = mock_curr_time
my_cache.put(5)
mock_datetime.now.return_value += datetime.timedelta(milliseconds=0.5)
assert my_cache.get(5, False) == retrieval_function(key=5)
def test_cache_fetches_new_item():
my_cache = cache.LRUCache[int, Union[int, str]](
max_cache_items=10,
expiration_horizon=datetime.timedelta(milliseconds=1),
retrieval_function=retrieval_function,
)
mock_curr_time = datetime.datetime.fromtimestamp(1636730651.079551)
with patch("datetime.datetime") as mock_datetime:
mock_datetime.now.return_value = mock_curr_time
my_cache.put(5, 10)
mock_datetime.now.return_value += datetime.timedelta(milliseconds=2)
assert my_cache.get(5) == retrieval_function(key=5)
with patch("datetime.datetime") as mock_datetime:
mock_datetime.now.return_value = mock_curr_time
my_cache.put(5, 10)
mock_datetime.now.return_value += datetime.timedelta(milliseconds=0.5)
assert my_cache.get(5, False) == 10
mock_datetime.now.return_value += datetime.timedelta(milliseconds=0.75)
with pytest.raises(KeyError):
my_cache.get(5, False)
def test_cache_removes_old_items_once_size_limit_reached():
my_cache = cache.LRUCache[int, Union[int, str]](
max_cache_items=5,
expiration_horizon=datetime.timedelta(hours=1),
retrieval_function=retrieval_function,
)
for i in [1, 2, 3, 4, 5]:
my_cache.put(i)
assert len(my_cache) == 5
my_cache.put(6)
assert len(my_cache) == 5
with pytest.raises(KeyError):
my_cache.get(1, False)
assert my_cache.get(2, False) == retrieval_function(key=2)
def test_cache_get_with_data_source_fallback():
my_cache = cache.LRUCache[int, Union[int, str]](
max_cache_items=5,
expiration_horizon=datetime.timedelta(hours=1),
retrieval_function=retrieval_function,
)
for i in range(10):
val = my_cache.get(i)
assert val == retrieval_function(key=i)
assert len(my_cache) == 5
def test_cache_gets_stored_value():
my_cache = cache.LRUCache[int, Union[int, str]](
max_cache_items=5,
expiration_horizon=datetime.timedelta(hours=1),
retrieval_function=retrieval_function,
)
for i in range(5):
my_cache.put(i)
my_cache._retrieval_function = MagicMock()
my_cache.get(4)
my_cache._retrieval_function.assert_not_called()
my_cache._retrieval_function.reset_mock()
my_cache.get(5)
my_cache._retrieval_function.assert_called_with(key=5, value=None)
my_cache._retrieval_function.reset_mock()
my_cache.get(0)
my_cache._retrieval_function.assert_called_with(key=0, value=None)
def test_cache_bad_retrieval_function():
cache_no_retrieval_fx = cache.LRUCache[int, Union[int, str]](
max_cache_items=5,
expiration_horizon=datetime.timedelta(hours=1),
retrieval_function=None,
)
with pytest.raises(TypeError):
cache_no_retrieval_fx.put(1)
cache_bad_retrieval_fx_signature = cache.LRUCache[int, Union[int, str]](
max_cache_items=5,
expiration_horizon=datetime.timedelta(hours=1),
retrieval_function=lambda: 1,
)
with pytest.raises(TypeError):
cache_bad_retrieval_fx_signature.put(1)
cache_retrieval_fx_throws = cache.LRUCache[int, Union[int, str]](
max_cache_items=5,
expiration_horizon=datetime.timedelta(hours=1),
retrieval_function=lambda key, value: exec("raise(RuntimeError())"),
)
with pytest.raises(RuntimeError):
cache_retrieval_fx_throws.put(1)
def test_cache_clear_and_contains():
my_cache = cache.LRUCache[int, Union[int, str]](
max_cache_items=5,
expiration_horizon=datetime.timedelta(hours=1),
retrieval_function=retrieval_function,
)
for i in range(5):
my_cache.put(i)
assert i in my_cache
my_cache.clear()
assert len(my_cache) == 0
with pytest.raises(KeyError):
my_cache.get(1, False)
|