Module org.htmlunit
Package org.htmlunit.javascript.host

Class PerformanceObserver

java.lang.Object
org.htmlunit.corejs.javascript.SlotMapOwner<org.htmlunit.corejs.javascript.Scriptable>
org.htmlunit.corejs.javascript.ScriptableObject
org.htmlunit.javascript.HtmlUnitScriptable
org.htmlunit.javascript.host.PerformanceObserver
All Implemented Interfaces:
Serializable, Cloneable, org.htmlunit.corejs.javascript.ConstProperties<org.htmlunit.corejs.javascript.Scriptable>, org.htmlunit.corejs.javascript.debug.DebuggableObject, org.htmlunit.corejs.javascript.PropHolder<org.htmlunit.corejs.javascript.Scriptable>, org.htmlunit.corejs.javascript.Scriptable, org.htmlunit.corejs.javascript.SymbolScriptable
public class PerformanceObserver extends HtmlUnitScriptable
JavaScript host object for PerformanceObserver.

HtmlUnit does not record performance entries, so the callback is never invoked. This implementation provides the API surface and the argument validation of real browsers, so scripts that use the observer (e.g. for feature detection) do not fail.

Author:
Ronald Brill
See Also:

  • Nested Class Summary

    Nested classes/interfaces inherited from class org.htmlunit.corejs.javascript.ScriptableObject

    org.htmlunit.corejs.javascript.ScriptableObject.DescriptorInfo, org.htmlunit.corejs.javascript.ScriptableObject.KeyComparator, org.htmlunit.corejs.javascript.ScriptableObject.LambdaGetterFunction, org.htmlunit.corejs.javascript.ScriptableObject.LambdaSetterFunction

  • Field Summary

    Fields inherited from class org.htmlunit.corejs.javascript.ScriptableObject

    CONST, DONTENUM, EMPTY, LEGACY_CONST, PERMANENT, READONLY, STRICTLY_READONLY, UNINITIALIZED_CONST

    Fields inherited from class org.htmlunit.corejs.javascript.SlotMapOwner

    isSealed

    Fields inherited from interface org.htmlunit.corejs.javascript.Scriptable

    NOT_FOUND

  • Constructor Summary

    Constructors
    Constructor
    Description
    PerformanceObserver()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    disconnect()
    Stops the observer from receiving performance entries.
    static org.htmlunit.corejs.javascript.Scriptable
    getSupportedEntryTypes(org.htmlunit.corejs.javascript.Scriptable thisObj)
    Returns the entry types supported by the browser.
    void
    jsConstructor(Object callback)
    Creates an instance of this object.
    void
    observe(Object options)
    Starts observing the given entry types.
    org.htmlunit.corejs.javascript.Scriptable
    takeRecords()
    Returns the performance entries stored in the observer, emptying it out.

    Methods inherited from class org.htmlunit.javascript.HtmlUnitScriptable

    clone, createDOMException, equivalentValues, get, getBrowserVersion, getClassName, getDefaultValue, getDomNodeOrDie, getDomNodeOrNull, getPrototype, getScriptableFor, getWindow, getWindow, getWindowOrWorkerGlobalScope, getWithPreemption, has, hasInstance, makeScriptableFor, put, setClassName, setDomNode, setDomNode, setupPromise, setupRejectedPromise

    Methods inherited from class org.htmlunit.corejs.javascript.ScriptableObject

    applyDescriptorToAttributeBitset, avoidObjectDetection, buildDataDescriptor, callMethod, callMethod, checkNotSealed, checkPropertyChangeForSlot, checkPropertyChangeForSlot, checkPropertyDefinition, checkPropertyDefinition, checkSlotRemoval, defineBuiltinProperty, defineBuiltinProperty, defineBuiltInProperty, defineClass, defineClass, defineClass, defineConst, defineConstProperty, defineFunctionProperties, defineOwnProperties, defineOwnProperty, defineOwnProperty, defineOwnProperty, defineProperty, defineProperty, defineProperty, defineProperty, defineProperty, defineProperty, defineProperty, defineProperty, defineProperty, defineProperty, delete, delete, delete, deleteProperty, deleteProperty, deleteProperty, ensureScriptable, ensureScriptableObject, ensureScriptableObjectButNotSymbol, ensureSymbolScriptable, ensureType, get, get, getAllIds, getAncestor, getArrayPrototype, getClassPrototype, getClassPrototype, getDefaultValue, getExternalArrayData, getExternalArrayLength, getFunctionPrototype, getGeneratorFunctionPrototype, getGetterOrSetter, getGetterOrSetter, getObjectPrototype, getOwnPropertyDescriptor, getParentScope, getProperty, getProperty, getProperty, getProperty, getProperty, getPropertyIds, getPrototype, getSuperProperty, getSuperProperty, getSuperProperty, getThis, getTopLevelScope, getTopScopeValue, getTypedProperty, getTypedProperty, getTypeOf, hasProperty, hasProperty, hasProperty, hasProperty, isAccessorDescriptor, isAccessorDescriptor, isConst, isDataDescriptor, isEmpty, isExtensible, isFalse, isGenericDescriptor, isGenericDescriptor, isGetterOrSetter, isGetterOrSetter, isTrue, preventExtensions, put, put, putConst, putConstProperty, putConstProperty, putOwnProperty, putOwnProperty, putOwnProperty, putProperty, putProperty, putProperty, putProperty, putSuperProperty, putSuperProperty, putSuperProperty, querySlot, redefineProperty, redefineProperty, sameValue, sealObject, setCommonDescriptorProperties, setExternalArrayData, setGetterOrSetter, setParentScope, setPrototype, size

    Methods inherited from class org.htmlunit.corejs.javascript.SlotMapOwner

    associateValue, checkNotSealed, copyAssociatedValue, createSlotMap, createSlotMap, defineProperty, defineProperty, get, getAssociatedValue, getAttributes, getAttributes, getAttributes, getAttributes, getAttributes, getIds, has, has, isSealed, readMaps, setAttributes, setAttributes, setAttributes, setAttributes, setAttributes, writeMaps

    Methods inherited from class java.lang.Object

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

    Methods inherited from interface org.htmlunit.corejs.javascript.Scriptable

    get, getIds, has, has

    Methods inherited from interface org.htmlunit.corejs.javascript.SymbolScriptable

    get, has

  • Constructor Details

    • PerformanceObserver

      public PerformanceObserver()

  • Method Details

    • jsConstructor

      public void jsConstructor(Object callback)
      Creates an instance of this object.
      Parameters:
      callback - the function called when observed entries are recorded

    • observe

      public void observe(Object options)
      Starts observing the given entry types.
      Parameters:
      options - the options (entryTypes, or type and buffered)

    • disconnect

      public void disconnect()
      Stops the observer from receiving performance entries.

    • takeRecords

      public org.htmlunit.corejs.javascript.Scriptable takeRecords()
      Returns the performance entries stored in the observer, emptying it out.
      Returns:
      an empty array, HtmlUnit does not record performance entries

    • getSupportedEntryTypes

      public static org.htmlunit.corejs.javascript.Scriptable getSupportedEntryTypes(org.htmlunit.corejs.javascript.Scriptable thisObj)
      Returns the entry types supported by the browser.
      Parameters:
      thisObj - the scriptable
      Returns:
      the entry types supported by the browser