completed FilesystemCache class with corresponding unit tests

jax/experimental/compilation_cache/compilation_cache_test.py

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+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License 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 absl.testing import absltest
+import jax.test_util as jtu
+import file_system_cache as fsc
+
+class CompilationClassTest(jtu.JaxTestCase):
+
+  def test_new_directory_and_path(self):
+   fileSystemCacheInstance = fsc.FileSystemCache("/tmp/new_cache_directory")
+   self.assertEqual(fileSystemCacheInstance.get("nonExistantFile"), None)
+
+  def test_new_directory_existing_path(self):
+   fileSystemCacheInstance = fsc.FileSystemCache("/tmp/new_cache_directory")
+   fileSystemCacheInstance.put("foo", b"bar")
+   self.assertEqual(fileSystemCacheInstance.get("foo"), b"bar")
+
+if __name__ == "__main__":
+  absltest.main(testLoader=jtu.JaxTestLoader())

jax/experimental/compilation_cache/file_system_cache.py

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+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License 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.
+#
+## Core functionality:
+##create my own directory in experimental folder in jax
+##file for this class then seperate file for tests
+
+
+from typing import Optional
+import os
+import tempfile
+
+class FileSystemCache:
+
+  def __init__(self, path: str):
+    """Sets up a cache at 'path'. Cached values may already be present."""
+    if not os.path.isdir(path):
+      print("HERE\n")
+      os.mkdir(path)
+    self.path  = path
+
+  def get(self, key: str) -> Optional[bytes]:
+    """Returns None if 'key' isn't present."""
+    path_to_key = os.path.join(self.path, key)
+    if(os.path.exists(path_to_key)):
+      with open(path_to_key, "rb") as file:
+        file_contents = file.read()
+      return file_contents
+    else:
+      return None
+
+  def put(self, key: str, value: bytes):
+    """Adds new cache entry, possibly evicting older entries."""
+    with open(os.path.join(self.path, key), "wb") as file:
+      file.write(value)