| # Licensed to the Apache Software Foundation (ASF) under one or more |
| # contributor license agreements. See the NOTICE file distributed with |
| # this work for additional information regarding copyright ownership. |
| # The ASF licenses this file to You 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 os |
| import socket |
| import threading |
| import time |
| |
| import rocketmq.utils |
| |
| |
| class ClientIdEncoder: |
| """This class generates a unique client ID for each client based on |
| hostname, process id, index and the monotonic clock time. |
| """ |
| |
| #: The current index for client id generation. |
| __INDEX = 0 |
| |
| #: The lock used for thread-safe incrementing of the index. |
| __INDEX_LOCK = threading.Lock() |
| |
| #: The separator used in the client id string. |
| __CLIENT_ID_SEPARATOR = "@" |
| |
| @staticmethod |
| def __get_and_increment_sequence() -> int: |
| """Increment and return the current index in a thread-safe manner. |
| |
| :return: the current index after incrementing it. |
| """ |
| with ClientIdEncoder.__INDEX_LOCK: |
| temp = ClientIdEncoder.__INDEX |
| ClientIdEncoder.__INDEX += 1 |
| return temp |
| |
| @staticmethod |
| def generate() -> str: |
| """Generate a unique client ID. |
| |
| :return: the generated client id |
| """ |
| index = ClientIdEncoder.__get_and_increment_sequence() |
| return ( |
| socket.gethostname() |
| + ClientIdEncoder.__CLIENT_ID_SEPARATOR |
| + str(os.getpid()) |
| + ClientIdEncoder.__CLIENT_ID_SEPARATOR |
| + str(index) |
| + ClientIdEncoder.__CLIENT_ID_SEPARATOR |
| + str(rocketmq.utils.number_to_base(time.monotonic_ns(), 36)) |
| ) |