Analysis of hot loading technical principles: Hot-Redis library in Python

Analysis of hot loading technical principles: Hot-Redis library in Python Heat load is a technology that is used to update and reload code, configuration files and resources during runtime.It allows developers to make dynamic changes without restarting applications, which greatly improves development efficiency and system availability.In Python, many thermal loading libraries can help developers to achieve one of this goal, plug and play with the heat loading function.This article will focus on the Hot-Redis library in Python. It is a powerful thermal loading tool, designed for integration with Redis database. Hot-Redis is an open source Python library designed to provide hot load support for Redis.It uses Redis's release/subscription mechanism to realize real -time updates and configurations, while ensuring seamless transition and high availability.The following is an analysis of the main principles and implementation methods of Hot-Redis. 1. Redis release/subscription mechanism: HOT-Redis uses Redis's release/subscription mechanism to achieve thermal loading function.Published/subscription is a message transmission mode in Redis, where the publisher sends messages to the specified channel, while subscribers receive messages from these channels.This mechanism allows developers to notify all subscribers to update by publishing new code or configuration. 2. Basic use of hot-redis: Developers need to add a reference to the Hot-Redis library to the application and specify the connection information of the Redis server through the configuration file.Once the configuration is completed, the heat loading can be achieved through the API provided by Hot-Redis.For example, you can subscribe the channel and define the updated adjustment function by using the `HotredIssubscriber` class and` ON_update` provided by Hot-Redis.When a new code or configuration is released, the subscriber will automatically receive and call the callback function to perform the corresponding operation. 3. Real -time update code and configuration: HOT-Redis uses the release/subscription mechanism to realize the function of real-time update code and configuration.Developers can use the `Hot_update` decorative provided by Hot-Redis to mark functions or methods that need to be loaded.Once the function is marked, when the new code is released, the subscriber will automatically update the corresponding function and switch to the new version without interrupting the existing features. 4. High availability and seamless transition: Hot-Redis uses the distributed characteristics of Redis to achieve high availability and seamless transition.Developers can set multiple Redis servers as the main structure to ensure that even if one of the server is down, the thermal loading function is still available.When the subscriber is connected to the main server, it automatically processes the server to ensure availability and redundancy. Below is an example code and related configuration using hot-redis: python from hot_redis import HotRedisSubscriber, hot_update config = { "redis": { "host": "localhost", "port": 6379, "db": 0 } } # Initialize hotdissubscriber subscriber = HotRedisSubscriber(config["redis"]["host"], config["redis"]["port"], config["redis"]["db"]) # Subscribe to channel and define the update recovery function @subscriber.on_update("channel_name") def update_handler(): # pass # The function that requires heat loading @hot_update(subscriber, "channel_name") def hot_loaded_function(): # # Start subscription subscriber.start() In the above example, we first configure the Hot-Redis by specifying the connection information of the Redis server.Then, we use the `Hotredissubscriber` to create a subscriber and define a callback function to process the update operation through the` On_update` decorative.Next, we use the `Hot_update` decorator to mark the functions that need to be loaded, and to achieve the operation of hot loading.Finally, we start the subscription process by calling the `Start` method. In summary, Hot-Redis is a powerful hot-added library that uses the release/subscription mechanism of Redis to achieve real-time update code and configuration functions, and ensures high availability and seamless transition through distributed features.It provides a simple and powerful way for Python developers to achieve thermal loading function, which greatly improves development efficiency and system availability.