Module jdk.jfr

Class RecordedObject

java.lang.Object
jdk.jfr.consumer.RecordedObject
Direct Known Subclasses:
RecordedClass, RecordedClassLoader, RecordedEvent, RecordedFrame, RecordedMethod, RecordedStackTrace, RecordedThread, RecordedThreadGroup

A complex data type that consists of one or more fields.

This class provides methods to select and query nested objects by passing a dot "." delimited String object (for instance, "aaa.bbb"). A method evaluates a nested object from left to right, and if a part is null, it throws NullPointerException.

Since:
9
  • Method Summary

    Modifier and Type
    Method
    Description
    final boolean
    Returns the value of a field of type boolean.
    final byte
    Returns the value of a field of type byte.
    final char
    Returns the value of a field of type char.
    Returns the value of a field of type Class.
    final double
    Returns the value of a field of type double or of another primitive type that is convertible to type double by a widening conversion.
    final Duration
    Returns the value of a timespan field.
    Returns an immutable list of the fields for this object.
    final float
    Returns the value of a field of type float or of another primitive type convertible to type float by a widening conversion.
    final Instant
    Returns the value of a timestamp field.
    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.
    final long
    Returns the value of a field of type long or of another primitive type that is convertible to type long by a widening conversion.
    final short
    Returns the value of a field of type short or of another primitive type convertible to type short by a widening conversion.
    final String
    Returns the value of a field of type String.
    Returns the value of a field of type Thread.
    final <T> T
    Returns the value of the field with the given name.
    boolean
    Returns true if a field with the given name exists, false otherwise.
    final String
    Returns a textual representation of this object.

    Methods declared in class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
  • Method Details

    • hasField

      public boolean hasField(String name)
      Returns true if a field with the given name exists, false otherwise.

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

      Parameters:
      name - name of the field to get, not null
      Returns:
      true if the field exists, false otherwise
      See Also:
    • 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.getJavaName());
      }
      
      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:
    • 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:
    • 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:
    • 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:
    • 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:
    • 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:
    • 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:
    • 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:
    • 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:
    • 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:
    • 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:
    • 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:
    • 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:
    • 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:
    • toString

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