1 # Copyright 2015 The TensorFlow Authors. All Rights Reserved. 2 # 3 # Licensed under the Apache License, Version 2.0 (the "License"); 4 # you may not use this file except in compliance with the License. 5 # You may obtain a copy of the License at 6 # 7 # http://www.apache.org/licenses/LICENSE-2.0 8 # 9 # Unless required by applicable law or agreed to in writing, software 10 # distributed under the License is distributed on an "AS IS" BASIS, 11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 # See the License for the specific language governing permissions and 13 # limitations under the License. 14 # ============================================================================== 15 """A cache for FileWriters.""" 16 17 from __future__ import absolute_import 18 from __future__ import division 19 from __future__ import print_function 20 21 import threading 22 23 from tensorflow.python.framework import ops 24 from tensorflow.python.summary.writer.writer import FileWriter 25 from tensorflow.python.util.tf_export import tf_export 26 27 28 @tf_export('summary.FileWriterCache') 29 class FileWriterCache(object): 30 """Cache for file writers. 31 32 This class caches file writers, one per directory. 33 """ 34 # Cache, keyed by directory. 35 _cache = {} 36 37 # Lock protecting _FILE_WRITERS. 38 _lock = threading.RLock() 39 40 @staticmethod 41 def clear(): 42 """Clear cached summary writers. Currently only used for unit tests.""" 43 with FileWriterCache._lock: 44 # Make sure all the writers are closed now (otherwise open file handles 45 # may hang around, blocking deletions on Windows). 46 for item in FileWriterCache._cache.values(): 47 item.close() 48 FileWriterCache._cache = {} 49 50 @staticmethod 51 def get(logdir): 52 """Returns the FileWriter for the specified directory. 53 54 Args: 55 logdir: str, name of the directory. 56 57 Returns: 58 A `FileWriter`. 59 """ 60 with FileWriterCache._lock: 61 if logdir not in FileWriterCache._cache: 62 FileWriterCache._cache[logdir] = FileWriter( 63 logdir, graph=ops.get_default_graph()) 64 return FileWriterCache._cache[logdir] 65
