程序包 ohos.utils

类 Stopwatch

java.lang.Object

ohos.utils.Stopwatch

public final class Stopwatch
extends Object

Provides the stopwatch function to log execution of subtasks split from a main task and uses HiLog to save the records in debug-level logs.

Example code:

 Stopwatch stopwatch = new Stopwatch(label, "main task");
 // Records the completion time of subtask A split from the main task.
 stopwatch.split("sub task A");
 // Records the completion time of subtask B split from the main task.
 stopwatch.split("sub task B");
 // Records the completion time of subtask C split from the main task.
 stopwatch.split("sub task C");
 stopwatch.writeLog();
 

The following records are written into the logs:

 8186 D 00000/StopwatchDemo: main task: begin
 8186 D 00000/StopwatchDemo: main task:      11 ms, 11%, sub task A
 8186 D 00000/StopwatchDemo: main task:      76 ms, 76%, sub task B
 8186 D 00000/StopwatchDemo: main task:      13 ms, 13%, sub task C
 8186 D 00000/StopwatchDemo: main task: end  100 ms
 

从以下版本开始:

2

构造器概要

构造器

构造器	说明
Stopwatch(HiLogLabel label, String taskName)	Creates a stopwatch logger.

方法概要

限定符和类型	方法	说明
void	reset()	Resets the stopwatch logger.
void	split(String subtaskName)	Records the completion time of a subtask split from the main task.
void	writeLog()	Writes the records in the stopwatch logger into the debug-level logs defined in HiLog.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

Stopwatch

public Stopwatch(HiLogLabel label,
                 String taskName)

Creates a stopwatch logger.

You are advised to create one stopwatch logger for each main task.

参数:

label - Indicates the HiLog label.

taskName - Indicates the task name.

从以下版本开始:

2

另请参阅:

HiLogLabel

方法详细资料

split

public void split(String subtaskName)

Records the completion time of a subtask split from the main task.

This method is called after a subtask is executed. Stopwatch#writeLog() uses the recorded time to calculate the subtask execution duration.

参数:

subtaskName - Indicates the subtask name.

从以下版本开始:

2

reset

public void reset()

Resets the stopwatch logger.

If a main task needs to be repeatedly executed, call this method to reset the stopwatch logger. After the reset, all of the history records will be cleared.

从以下版本开始:

2

writeLog

public void writeLog()

Writes the records in the stopwatch logger into the debug-level logs defined in HiLog.

Note: This method does not clear history records, which will also be written into the logs. To clear the history records, call Stopwatch#reset().

从以下版本开始:

2