Class RecordedObject

Direct Known Subclasses:
RecordedClass, RecordedClassLoader, RecordedEvent, RecordedFrame, RecordedMethod, RecordedStackTrace, RecordedThread, RecordedThreadGroup 
public class RecordedObject
extends Object

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

Methods

Modifier and Type Method Description
boolean getBoolean​(String name)

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

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

Returns the value of a field of type char.
RecordedClass getClass​(String name)

Returns the value of a field of type Class.
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.
Duration getDuration​(String name)

Returns the value of a timespan field.
List<ValueDescriptor> getFields()

Returns an immutable list of the fields for this object.
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.
Instant getInstant​(String name)

Returns the value of a timestamp field.
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.
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.
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.
String getString​(String name)

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

Returns the value of a field of type Thread.
<T> T getValue​(String name)

Returns the value of the field with the given name.
boolean hasField​(String name)

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

Returns a textual representation of this object.

Methods declared in class java.lang.Object

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

Methods

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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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
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https://docs.oracle.com/en/java/javase/11/docs/api/jdk.jfr/jdk/jfr/consumer/RecordedObject.html