Common methods of StopWatch for Java utility class Spring

Preface

In daily development, we often need to monitor and analyze the execution of code time. Spring provides a lightweight timing tool class:, can easily achieve accurate time-consuming statistics of multiple tasks, especially suitable for performance tuning and debugging analysis scenarios.

1. Introduction to StopWatch

StopWatchIs a practical class in Spring Core that is used to time and result statistics on multiple stages in code execution. It supports task segmentation recording, total time-consuming statistics, task name recording and other functions.

2. Common methods of StopWatch

1. Construction method

StopWatch stopWatch = new StopWatch("performance-monitor");

Parameters are optional and are used to name the current timer.

2. Start a task

("task1");

Start recording a task and name it.

3. Stop the current task

();

Stops the currently logged task.

4. Judge the status

();

Determine whether there are still tasks running.

5. Obtain statistics

(); // Print all tasks and time-consuming information (formatted)(); // Total time (milliseconds)(); // Get the number of tasks

6. Obtain specific task information

TaskInfo[] tasks = ();
for (TaskInfo task : tasks) {
    (() + ": " + ());
}

3. Common usage scenarios

1. Performance bottleneck check

Insert multiple in complex methods("stepX")Recording each stage takes time.

StopWatch sw = new StopWatch();
("loadDb");
loadFromDatabase();
();
("parseJson");
parseJsonData();
();
(());

2. Interface performance statistics

It can be used for interceptors, filters, etc., to calculate the time-consuming of the entire interface and each subprocess.

3. Unit test performance analysis

Evaluate the stability and time-consuming of a method call in the test code.

4. Multithreaded task analysis (note thread isolation)

In concurrency scenarios, it is not recommended that multiple threads share oneStopWatchInstances, instances should be created independently for each thread.

4. Comparative advantages with ()

5. Summary

StopWatchIt is an extremely useful development aid in the Spring framework. It provides lightweight but powerful capabilities for performance analysis and debugging, simple to use and no complex configuration required.

It is recommended to use it in performance-sensitive areas such as interface call chains, framework extension points, and custom components in combination with logging systems or APM tools.StopWatch, help us quickly locate bottlenecks and quantify the optimization effect during the development stage.

Tip: Don't abuse it in production environments(), it is more appropriate to output logs in a directional direction or collect information in combination with a custom log format.

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