Module jdk.jfr

Class RecordedObject

    • Method Detail

      • hasField

        public boolean hasField​(String name)
        Returns true if a field with the given name exists, false otherwise.
        Parameters:
        name - name of the field to get, not null
        Returns:
        true if the field exists, false otherwise.
        See Also:
        getFields()
      • getValue

        public final <T> T getValue​(String name)
        Returns the value of the field with the given name.

        The return type may be a primitive type or a subclass of RecordedObject.

        It's possible to index into a nested object by using "." (for instance "thread.group.parent.name").

        A field might change or be removed in a future JDK release. A best practice for callers of this method is to validate the field before attempting access.

        Example

         
         if (event.hasField("intValue")) {
           int intValue = event.getValue("intValue");
           System.out.println("Int value: " + intValue);
         }
        
         if (event.hasField("objectClass")) {
           RecordedClass clazz = event.getValue("objectClass");
           System.out.println("Class name: " + clazz.getName());
         }
        
         if (event.hasField("sampledThread")) {
           RecordedThread sampledThread = event.getValue("sampledThread");
           System.out.println("Sampled thread: " + sampledThread.getName());
         }
         
         
        Type Parameters:
        T - the return type
        Parameters:
        name - of the field to get, not null
        Returns:
        the value, can be null
        Throws:
        IllegalArgumentException - if no field called name exists
        See Also:
        hasField(String)
      • getFields

        public List<ValueDescriptor> getFields()
        Returns an immutable list of the fields for this object.
        Returns:
        the fields, not null
      • getBoolean

        public final boolean getBoolean​(String name)
        Returns the value of a field of type boolean.

        It's possible to index into a nested object using "." (for example, "aaa.bbb").

        A field might change or be removed in a future JDK release. A best practice for callers of this method is to validate the field before attempting access.

        Parameters:
        name - name of the field to get, not null
        Returns:
        the value of the field, true or false
        Throws:
        IllegalArgumentException - if the field doesn't exist, or the field is not of type boolean
        See Also:
        hasField(String), getValue(String)
      • getByte

        public final byte getByte​(String name)
        Returns the value of a field of type byte.

        It's possible to index into a nested object using "." (for example, "foo.bar").

        A field might change or be removed in a future JDK release. A best practice for callers of this method is to validate the field before attempting access.

        Parameters:
        name - of the field to get, not null
        Returns:
        the value of the field
        Throws:
        IllegalArgumentException - if the field doesn't exist, or the field is not of type byte
        See Also:
        hasField(String), getValue(String)
      • getChar

        public final char getChar​(String name)
        Returns the value of a field of type char.

        It's possible to index into a nested object using "." (for example, "aaa.bbb").

        A field might change or be removed in a future JDK release. A best practice for callers of this method is to validate the field before attempting access.

        Parameters:
        name - of the field to get, not null
        Returns:
        the value of the field as a char
        Throws:
        IllegalArgumentException - if the field doesn't exist, or the field is not of type char
        See Also:
        hasField(String), getValue(String)
      • getShort

        public final short getShort​(String name)
        Returns the value of a field of type short or of another primitive type convertible to type short by a widening conversion.

        This method can be used on the following types: short and byte.

        If the field has the @Unsigned annotation and is of a narrower type than short, then the value is returned as an unsigned.

        It's possible to index into a nested object using "." (for example, "aaa.bbb").

        A field might change or be removed in a future JDK release. A best practice for callers of this method is to validate the field before attempting access.

        Parameters:
        name - of the field to get, not null
        Returns:
        the value of the field converted to type short
        Throws:
        IllegalArgumentException - if the field doesn't exist, or the field value can't be converted to the type short by a widening conversion
        See Also:
        hasField(String)
      • getInt

        public final int getInt​(String name)
        Returns the value of a field of type int or of another primitive type that is convertible to type int by a widening conversion.

        This method can be used on fields of the following types: int, short, char, and byte.

        If the field has the @Unsigned annotation and is of a narrower type than int, then the value will be returned as an unsigned.

        It's possible to index into a nested object using "." (for example, "aaa.bbb").

        A field might change or be removed in a future JDK release. A best practice for callers of this method is to validate the field before attempting access.

        Parameters:
        name - of the field to get, not null
        Returns:
        the value of the field converted to type int
        Throws:
        IllegalArgumentException - if the field doesn't exist, or the field value can't be converted to the type int by a widening conversion
        See Also:
        hasField(String)
      • getFloat

        public final float getFloat​(String name)
        Returns the value of a field of type float or of another primitive type convertible to type float by a widening conversion.

        This method can be used on fields of the following types: float, long, int, short, char, and byte.

        It's possible to index into a nested object using "." (for example, "aaa.bbb").

        A field might change or be removed in a future JDK release. A best practice for callers of this method is to validate the field before attempting access.

        Parameters:
        name - of the field to get, not null
        Returns:
        the value of the field converted to type float
        Throws:
        IllegalArgumentException - if the field doesn't exist, or the field value can't be converted to the type float by a widening conversion
        See Also:
        hasField(String)
      • getLong

        public final long getLong​(String name)
        Returns the value of a field of type long or of another primitive type that is convertible to type long by a widening conversion.

        This method can be used on fields of the following types: long, int, short, char, and byte.

        If the field has the @Unsigned annotation and is of a narrower type than long, then the value will be returned as an unsigned.

        It's possible to index into a nested object using "." (for example, "aaa.bbb").

        A field might change or be removed in a future JDK release. A best practice for callers of this method is to validate the field before attempting access.

        Parameters:
        name - of the field to get, not null
        Returns:
        the value of the field converted to type long
        Throws:
        IllegalArgumentException - if the field doesn't exist, or the field value can't be converted to the type long via a widening conversion
        See Also:
        hasField(String)
      • getDouble

        public final double getDouble​(String name)
        Returns the value of a field of type double or of another primitive type that is convertible to type double by a widening conversion.

        This method can be used on fields of the following types: double, float, long, int, short, char, and byte.

        It's possible to index into a nested object using "." (for example, "aaa.bbb").

        A field might change or be removed in a future JDK release. A best practice for callers of this method is to validate the field before attempting access.

        Parameters:
        name - of the field to get, not null
        Returns:
        the value of the field converted to type double
        Throws:
        IllegalArgumentException - if the field doesn't exist, or the field value can't be converted to the type double by a widening conversion
        See Also:
        hasField(String)
      • getString

        public final String getString​(String name)
        Returns the value of a field of type String.

        It's possible to index into a nested object using "." (for example, "foo.bar").

        A field might change or be removed in a future JDK release. A best practice for callers of this method is to validate the field before attempting access.

        Parameters:
        name - of the field to get, not null
        Returns:
        the value of the field as a String, can be null
        Throws:
        IllegalArgumentException - if the field doesn't exist, or the field isn't of type String
        See Also:
        hasField(String)
      • getDuration

        public final Duration getDuration​(String name)
        Returns the value of a timespan field.

        This method can be used on fields annotated with @Timespan, and of the following types: long, int, short, char, and byte.

        It's possible to index into a nested object using "." (for example, "aaa.bbb").

        A field might change or be removed in a future JDK release. A best practice for callers of this method is to validate the field before attempting access.

        Parameters:
        name - of the field to get, not null
        Returns:
        a time span represented as a Duration, not null
        Throws:
        IllegalArgumentException - if the field doesn't exist, or the field value can't be converted to a Duration object
        See Also:
        hasField(String)
      • getInstant

        public final Instant getInstant​(String name)
        Returns the value of a timestamp field.

        This method can be used on fields annotated with @Timestamp, and of the following types: long, int, short, char and byte.

        It's possible to index into a nested object using "." (for example, "aaa.bbb").

        A field might change or be removed in a future JDK release. A best practice for callers of this method is to validate the field before attempting access.

        Parameters:
        name - of the field to get, not null
        Returns:
        a timstamp represented as an Instant, not null
        Throws:
        IllegalArgumentException - if the field doesn't exist, or the field value can't be converted to an Instant object
        See Also:
        hasField(String)
      • getClass

        public final RecordedClass getClass​(String name)
        Returns the value of a field of type Class.

        It's possible to index into a nested object using "." (for example, "aaa.bbb").

        A field might change or be removed in a future JDK release. A best practice for callers of this method is to validate the field before attempting access.

        Parameters:
        name - of the field to get, not null
        Returns:
        the value of the field as a RecordedClass, can be null
        Throws:
        IllegalArgumentException - if the field doesn't exist, or the field isn't of type Class
        See Also:
        hasField(String)
      • getThread

        public final RecordedThread getThread​(String name)
        Returns the value of a field of type Thread.

        It's possible to index into a nested object using "." (for example, "foo.bar").

        A field might change or be removed in a future JDK release. A best practice for callers of this method is to validate the field before attempting access.

        Parameters:
        name - of the field to get, not null
        Returns:
        the value of the field as a RecordedThread object, can be null
        Throws:
        IllegalArgumentException - if the field doesn't exist, or the field isn't of type Thread
        See Also:
        hasField(String)
      • toString

        public final String toString()
        Returns a textual representation of this object.
        Overrides:
        toString in class Object
        Returns:
        textual description of this object

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