unique_name.py 1.9 KB
Newer Older
Y
Yu Yang 已提交
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
#   Copyright (c) 2018 PaddlePaddle 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.

import collections
import contextlib
import sys

__all__ = ['generate', 'switch', 'guard', 'UniqueNameGenerator']


class UniqueNameGenerator(object):
    """
    Generate unique name with prefix.

    Args:
        prefix(str): The generated name prefix. All generated name will be
                     started with this prefix.
    """

    def __init__(self, prefix=None):
        self.ids = collections.defaultdict(int)
        if prefix is None:
            prefix = ""
        self.prefix = prefix

    def __call__(self, key):
        """
        Generate unique names with prefix

        Args:
            key(str): The key of return string.

        Returns(str): A unique string with the prefix
        """
        tmp = self.ids[key]
        self.ids[key] += 1
        return self.prefix + "_".join([key, str(tmp)])


generator = UniqueNameGenerator()


Y
Yu Yang 已提交
54 55
def generate(key):
    return generator(key)
Y
Yu Yang 已提交
56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74


def switch(new_generator=None):
    global generator
    old = generator
    if new_generator is None:
        generator = UniqueNameGenerator()
    else:
        generator = new_generator
    return old


@contextlib.contextmanager
def guard(new_generator=None):
    if isinstance(new_generator, basestring):
        new_generator = UniqueNameGenerator(new_generator)
    old = switch(new_generator)
    yield
    switch(old)