Writes event information to the event file of the current day. This function supports JSON parameters and uses an asynchronous callback to return the result.
Writes event information to the event file of the current day. This API supports JSON parameters and uses an asynchronous callback to return the result.
| eventName | string | Yes | App event name.<br>You need to customize the event name. It can contain a maximum of 48 characters, including digits (0 to 9), letters (a to z), and underscores (\_). It must start with a letter.|
| keyValues | object | Yes| Array of JSON parameters of the application event. A key must be a string, and a value must be a string, number, boolean, or Array (which can only be a string, number, or boolean).|
| keyValues | object | Yes | Parameter key-value pair. For a variable-length parameter, enter each pair of parameter name and value in sequence. For a JSON parameter, enter the parameter name as the key and parameter value as the value.<br>- A key must be a string, and a value must be a string, number, boolean, or Array (which can only be a string, number, or boolean).<br>- The number of event parameters must be less than or equal to 32.<br>- The parameter name can contain a maximum of 16 characters, including digits (0 to 9), letters (a to z), and underscores (\_). It must start with a letter and cannot end with an underscore (\_).<br>- A string value can contain a maximum of 8*1024 characters.<br>- An array value can contain a maximum of 100 elements. Excess elements will be truncated.|
| callback | AsyncCallback<void> | No| Callback used to process the received return value. <br/>- The value **0** indicates that the event parameter verification is successful, and the event will be written to the event file asynchronously.<br/>- A value greater than **0** indicates that invalid parameters are present in the event, and the event will be written to the event file asynchronously after the invalid parameters are ignored.<br/>- A value smaller than **0** indicates that the event parameter verification fails, and the event will not be written to the event file asynchronously.|
| callback | AsyncCallback<void> | No | Callback used to process the received return value.<br>- Value **0** indicates that the event verification is successful, and the event will be written to the event file asynchronously. <br>- A value greater than **0** indicates that invalid parameters are present in the event, and the event will be written to the event file asynchronously after the invalid parameters are ignored. <br>- A value smaller than **0** indicates that the event verification fails, and the event will not be written to the event file.|
| eventName | string | Yes | App event name.<br>You need to customize the event name. It can contain a maximum of 48 characters, including digits (0 to 9), letters (a to z), and underscores (\_). It must start with a letter.|
| keyValues | object | Yes| Array of JSON parameters of the application event. A key must be a string, and a value must be a string, number, boolean, or Array (which can only be a string, number, or boolean).|
| keyValues | object | Yes | Parameter key-value pair. For a variable-length parameter, enter each pair of parameter name and value in sequence. For a JSON parameter, enter the parameter name as the key and parameter value as the value.<br>- A key must be a string, and a value must be a string, number, boolean, or Array (which can only be a string, number, or boolean).<br>- The number of event parameters must be less than or equal to 32.<br>- The parameter name can contain a maximum of 16 characters, including digits (0 to 9), letters (a to z), and underscores (\_). It must start with a letter and cannot end with an underscore (\_).<br>- A string value can contain a maximum of 8*1024 characters.<br>- An array value can contain a maximum of 100 elements. Excess elements will be truncated.|
Configures the application event logging function, such as setting the event logging switch and maximum size of the directory that stores the event logging files.
Configures the application event logging function, such as setting the event logging switch and maximum size of the directory that stores the event logging files.
| disable | boolean | No| Application event logging switch. The value <b>true</b> means to disable the application event logging function, and the value <b>false</b> means the opposite.|
| Name | Type | Mandatory| Description |
| maxStorage | string | No| Maximum size of the event file storage directory. The default value is **10M**. If the specified size is exceeded, the oldest event logging files in the storage directory will be deleted to free up space.|
| disable | boolean | No | Application event logging switch. The value <b>true</b> means to disable the application event logging function, and the value <b>false</b> means the opposite.|
| maxStorage | string | No | Maximum size of the event file storage directory. The default value is **10M**. If the specified size is exceeded, the oldest event logging files in the storage directory will be deleted to free up space.|
Starts the profiling method. `startProfiling()` and `stopProfiling()` are called in pairs. `startProfiling()` always occurs before `stopProfiling()`; that is, calling the functions in the following sequences is prohibited: `start->start->stop`, `start->stop->stop`, and `start->start->stop->stop`.
Starts the profiling method. `startProfiling()` and `stopProfiling()` are called in pairs. `startProfiling()` always occurs before `stopProfiling()`; that is, calling the functions in the following sequences is prohibited: `start->start->stop`, `start->stop->stop`, and `start->start->stop->stop`.
| filename | string | Yes| User-defined profile name. The `filename.json` file is generated in the `files` directory of the application based on the specified `filename`.|
| filename | string | Yes| User-defined profile name. The `filename.json` file is generated in the `files` directory of the application based on the specified `filename`.|
**Example**
**Example**
...
@@ -141,6 +149,8 @@ stopProfiling() : void
...
@@ -141,6 +149,8 @@ stopProfiling() : void
Stops the profiling method. `stopProfiling()` and `startProfiling()` are called in pairs. `stopProfiling()` always occurs after `startProfiling()`; that is, calling the functions in the following sequences is prohibited: `start->start->stop`, `start->stop->stop`, and `start->start->stop->stop`.
Stops the profiling method. `stopProfiling()` and `startProfiling()` are called in pairs. `stopProfiling()` always occurs after `startProfiling()`; that is, calling the functions in the following sequences is prohibited: `start->start->stop`, `start->stop->stop`, and `start->start->stop->stop`.
| filename | string | Yes| User-defined heap file name. The `filename.heapsnapshot` file is generated in the `files` directory of the app based on the specified `filename`.|
| filename | string | Yes| User-defined heap file name. The `filename.heapsnapshot` file is generated in the `files` directory of the app based on the specified `filename`.|
> The initial APIs of this module are supported since API version 8. Newly added APIs will be marked with a superscript to indicate their earliest API version.
> The initial APIs of this module are supported since API version 7. Newly added APIs will be marked with a superscript to indicate their earliest API version.
| domain | number | Yes| Service domain. The value ranges from **0x0** to **0xFFFFF**.|
| domain | number | Yes | Service domain. The value ranges from **0x0** to **0xFFFFF**. |
| tag | string | Yes| String constant used to identify the class or service behavior.|
| tag | string | Yes | String constant used to identify the class or service behavior. |
| format | string | Yes| String constant format, including the parameter type and privacy identifier. A parameter without the privacy identifier is treated as a privacy parameter by default.|
| format | string | Yes| String constant format, including the parameter type and privacy identifier. A parameter without the privacy identifier is treated as a privacy parameter by default.|
| args | any[] | Yes| Variable-length parameter list corresponding to the parameter type in the format string. The number and type of parameters must map to the identifier in the format string.|
| args | any[] | Yes| Variable-length parameter list corresponding to the parameter type in the format string. The number and type of parameters must map to the identifier in the format string.|
| domain | number | Yes| Service domain. The value ranges from **0x0** to **0xFFFFF**.|
| domain | number | Yes | Service domain. The value ranges from **0x0** to **0xFFFFF**. |
| tag | string | Yes| String constant used to identify the class or service behavior.|
| tag | string | Yes | String constant used to identify the class or service behavior. |
| format | string | Yes| String constant format, including the parameter type and privacy identifier. A parameter without the privacy identifier is treated as a privacy parameter by default.|
| format | string | Yes| String constant format, including the parameter type and privacy identifier. A parameter without the privacy identifier is treated as a privacy parameter by default.|
| args | any[] | Yes| Variable-length parameter list corresponding to the parameter type in the format string. The number and type of parameters must map to the identifier in the format string.|
| args | any[] | Yes| Variable-length parameter list corresponding to the parameter type in the format string. The number and type of parameters must map to the identifier in the format string.|
| domain | number | Yes| Service domain. The value ranges from **0x0** to **0xFFFFF**.|
| domain | number | Yes | Service domain. The value ranges from **0x0** to **0xFFFFF**. |
| tag | string | Yes| String constant used to identify the class or service behavior.|
| tag | string | Yes | String constant used to identify the class or service behavior. |
| format | string | Yes| String constant format, including the parameter type and privacy identifier. A parameter without the privacy identifier is treated as a privacy parameter by default.|
| format | string | Yes| String constant format, including the parameter type and privacy identifier. A parameter without the privacy identifier is treated as a privacy parameter by default.|
| args | any[] | Yes| Variable-length parameter list corresponding to the parameter type in the format string. The number and type of parameters must map to the identifier in the format string.|
| args | any[] | Yes| Variable-length parameter list corresponding to the parameter type in the format string. The number and type of parameters must map to the identifier in the format string.|
| domain | number | Yes| Service domain. The value ranges from **0x0** to **0xFFFFF**.|
| domain | number | Yes | Service domain. The value ranges from **0x0** to **0xFFFFF**. |
| tag | string | Yes| String constant used to identify the class or service behavior.|
| tag | string | Yes | String constant used to identify the class or service behavior. |
| format | string | Yes| String constant format, including the parameter type and privacy identifier. A parameter without the privacy identifier is treated as a privacy parameter by default.|
| format | string | Yes| String constant format, including the parameter type and privacy identifier. A parameter without the privacy identifier is treated as a privacy parameter by default.|
| args | any[] | Yes| Variable-length parameter list corresponding to the parameter type in the format string. The number and type of parameters must map to the identifier in the format string.|
| args | any[] | Yes| Variable-length parameter list corresponding to the parameter type in the format string. The number and type of parameters must map to the identifier in the format string.|
| domain | number | Yes| Service domain. The value ranges from **0x0** to **0xFFFFF**.|
| domain | number | Yes | Service domain. The value ranges from **0x0** to **0xFFFFF**. |
| tag | string | Yes| String constant used to identify the class or service behavior.|
| tag | string | Yes | String constant used to identify the class or service behavior. |
| format | string | Yes| String constant format, including the parameter type and privacy identifier. A parameter without the privacy identifier is treated as a privacy parameter by default.|
| format | string | Yes| String constant format, including the parameter type and privacy identifier. A parameter without the privacy identifier is treated as a privacy parameter by default.|
| args | any[] | Yes| Variable-length parameter list corresponding to the parameter type in the format string. The number and type of parameters must map to the identifier in the format string.|
| args | any[] | Yes| Variable-length parameter list corresponding to the parameter type in the format string. The number and type of parameters must map to the identifier in the format string.|
@@ -11,21 +11,18 @@ import hiTraceMeter from '@ohos.hiTraceMeter';
...
@@ -11,21 +11,18 @@ import hiTraceMeter from '@ohos.hiTraceMeter';
```
```
## System Capabilities
SystemCapability.HiviewDFX.HiTrace
## hiTraceMeter.startTrace
## hiTraceMeter.startTrace
startTrace(name: string, taskId: number): void
startTrace(name: string, taskId: number): void
Starts a trace task.
Starts a trace task.**expectedTime** is an optional parameter, which specifies the expected duration of the trace.
If multiple trace tasks with the same name need to be performed at the same time or a trace task needs to be performed multiple times concurrently, different task IDs must be specified in **startTrace**.
If multiple trace tasks with the same name need to be performed at the same time or a trace task needs to be performed multiple times concurrently, different task IDs must be specified in **startTrace**.
If the trace tasks with the same name are not performed at the same time, the same taskId can be used. For a specific example, refer to an example in [hiTraceMeter.finishTrace](#hitracemeterfinishtrace).
If the trace tasks with the same name are not performed at the same time, the same taskId can be used. For a specific example, refer to an example in [hiTraceMeter.finishTrace](#hitracemeterfinishtrace).
