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# Copyright (C) 2021 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
#
# This work is made available under the Nvidia Source Code License-NC.
# To view a copy of this license, check out LICENSE.md
import diskcache
"""
INFO:
Cache objects are thread-safe and may be shared between threads.
Two Cache objects may also reference the same directory from separate
threads or processes. In this way, they are also process-safe and support
cross-process communication.
"""
class Cache(object):
r"""This creates an on disk cache, which saves files as bytes.
Args:
root (str): Path to the cache dir.
size_MB (float): Size of cache in MB.
"""
def __init__(self, root, size_GB):
self.root = root
self.size_limit_B = size_GB * 1024 * 1024 * 1024
self.cache = diskcache.Cache(root, size_limit=self.size_limit_B)
print('Created cache of max size %d GB at %s' %
(size_GB, self.cache.directory))
def read(self, key):
if key in self.cache:
return self.cache[key]
return False
def write(self, key, value):
try:
self.cache[key] = value
except Exception as e: # noqa
print(e)
return False