Increases and optimization strategies in the asynchronous log writing principle and optimization strategy in the logback Android framework

Logback is a reliable and flexible log component for Java applications.On the Android platform, you can use the logback android framework to achieve the asynchronous writing and optimization of the log.This article will introduce the principles and optimization strategies written by asynchronous logs in the logback android framework, and provide the corresponding Java code example. ## asynchronous log writing principle In the traditional synchronous log writing method, the log sentence will be written directly to the disk or other output targets, which will block the execution of the current thread and lead to a decline in performance.The writing method of asynchronous logs puts the log into an independent thread for execution, thereby reducing the impact on the main thread and improving the response performance of the application. The principle of asynchronous logs written in the LOGBACK Android framework mainly involves the following components: 1. `APPENDER`: Responsible for writing logs to the specified targets, such as files, databases, etc.LOGBACK provides a variety of types of `APPENDER`, which can choose the appropriate type according to actual needs. 2. `Asyncappender`: It is a package of` Appender`, which is used to achieve asynchronous logs.`ASYNCAPPENDER A maintains a ring buffer internally, receives and cached the log event, and then passes the event to the real` APPENDER`. 3. `Discardingasyncappender`: It is a special type of` Asyncappender`. When the buffer is over, some unprecedented logs will be discarded.This prevents the memory consumption of the application due to excessive logs. The basic principle written by the asynchronous log is that when the application calls the logback API to record the log, the log event will be placed in the buffer area of the `Asyncappender` and returns to the adjustment thread immediately, and will not wait for the log writing operation.Then the work thread of `Asyncappender` obtains the log event from the buffer, and calls the real` APPENDER` for actual log writing operation. ## Optimized strategy written by asynchronous logs In order to further improve the performance and efficiency of asynchronous logs, the logback android framework provides some optimization strategies: 1. Cushion size: The size of the buffer of the `Asyncappender` can be set to control the number of logs.The larger buffer can reduce the number of writing operations, but increases memory consumption.Small buffer can reduce memory consumption, but may lead to more frequent writing operations. 2. Log queue blocking strategy: You can configure the behavior when the buffer is full.By default, `Asyncappender` will block the calling thread until there is enough space to put the new log event into the buffer.You can also choose other blocking strategies, such as discarding or waiting for a while before trying to write. 3. Asynchronous writing into the task thread pool: You can configure the `asyncappender` to use a thread pool to perform asynchronous writing operations.This can effectively reuse threads to avoid frequent creation and destruction of thread objects. Below is a simple LOGBACK android configuration file example to demonstrate how to use asynchronous log writing and optimization strategies: <configuration> <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender"> <encoder> <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern> </encoder> </appender> <appender name="ASYNC" class="ch.qos.logback.classic.AsyncAppender"> <appender-ref ref="CONSOLE" /> <queueSize>1024</queueSize> <discardingThreshold>0</discardingThreshold> <executorService class="java.util.concurrent.ThreadPoolExecutor"> <corePoolSize>1</corePoolSize> <maxPoolSize>10</maxPoolSize> </executorService> </appender> <root level="debug"> <appender-ref ref="ASYNC" /> </root> </configuration> In the above examples, a `ConsoleAppender` is configured as a real log to write the target, and then write asynchronous by` Asyncappender`.The size of the buffer is set to 1024 and will not discard any log event (`DiscardingthReshold` is 0).The use of a thread pool object to perform asynchronous writing tasks. Among them, the core thread pool size is 1, and the maximum thread pool size is 10. Through the above configuration, the application will record the log in an asynchronous manner to improve the response speed and performance of the application. To sum up, the asynchronous log writing principle and optimization strategy in the logback android framework can help developers to record and manage log information more efficiently, so that applications have high performance while having log records.