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# Copyright 2015 The TensorFlow Authors. 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.
# You may obtain a copy of the License at
#
# http://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.
# ==============================================================================
"""A cache for FileWriters."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import threading
from tensorflow.python.framework import ops
from tensorflow.python.summary.writer.writer import FileWriter
class FileWriterCache(object):
"""Cache for file writers.
This class caches file writers, one per directory.
"""
# Cache, keyed by directory.
_cache = {}
# Lock protecting _FILE_WRITERS.
_lock = threading.RLock()
@staticmethod
def clear():
"""Clear cached summary writers. Currently only used for unit tests."""
with FileWriterCache._lock:
# Make sure all the writers are closed now (otherwise open file handles
# may hang around, blocking deletions on Windows).
for item in FileWriterCache._cache.values():
item.close()
FileWriterCache._cache = {}
@staticmethod
def get(logdir):
"""Returns the FileWriter for the specified directory.
Args:
logdir: str, name of the directory.
Returns:
A `FileWriter`.
"""
with FileWriterCache._lock:
if logdir not in FileWriterCache._cache:
FileWriterCache._cache[logdir] = FileWriter(
logdir, graph=ops.get_default_graph())
return FileWriterCache._cache[logdir]
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