harmony 鸿蒙@ohos.hiviewdfx.jsLeakWatcher (JS Leak Watcher)
@ohos.hiviewdfx.jsLeakWatcher (JS Leak Watcher)
This module provides the capability of monitoring whether JS objects are leaked.
NOTE
The initial APIs of this module are supported since API version 12. Newly added APIs will be marked with a superscript to indicate their earliest API version.
Modules to Import
import { jsLeakWatcher } from '@kit.PerformanceAnalysisKit';
jsLeakWatcher.enable
enable(isEnable: boolean): void
Enables the detection for JS object leak. This function is disabled by default.
System capability: SystemCapability.HiviewDFX.HiChecker
Parameters
| Name | Type | Mandatory | Description |
|---|---|---|---|
| isEnable | boolean | Yes | Whether to enable jsLeakWatcher. |
Example
jsLeakWatcher.enable(true);
jsLeakWatcher.watch
watch(obj: object, msg: string): void
Registers the object to be checked.
System capability: SystemCapability.HiviewDFX.HiChecker
Parameters
| Name | Type | Mandatory | Description |
|---|---|---|---|
| obj | object | Yes | Name of the object to be checked. |
| msg | string | Yes | Custom object information. |
Example
let obj:Object = new Object();
jsLeakWatcher.watch(obj, "Trace Object");
jsLeakWatcher.check
check(): string
Obtains the list of objects that are registered using jsLeakWatcher.watch() and may leak. Objects that are not reclaimed after GC is triggered are marked as leaked.
System capability: SystemCapability.HiviewDFX.HiChecker
Return value
| Type | Description |
|---|---|
| string | List of objects that are suspected to leak, in JSON format. |
Example
let leakObjlist:string = jsLeakWatcher.check();
jsLeakWatcher.dump
dump(filePath: string): Array<string>
Exports the list of leaked objects and VM memory snapshot.
System capability: SystemCapability.HiviewDFX.HiChecker
Parameters
| Name | Type | Mandatory | Description |
|---|---|---|---|
| filePath | string | Yes | The path for storing exported information files. |
Return value
| Type | Description |
|---|---|
| Array<string> | Array of exported results. Index 0 indicates the name of the leak list file, whose name extension is .jsleaklist. Index 1 indicates the name of the VM memory snapshot file, whose name extension is .heapsnapshort. |
Error codes
For details about the error codes, see Universal Error Codes.
| ID | Error Message |
|---|---|
| 401 | Parameter error. The filepath is invalid. |
Example
let context = this.getUIContext().getHostContext();
let files: Array<string> = jsLeakWatcher.dump(context?.filesDir);
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