Class RecordingFile

All Implemented Interfaces:
Closeable, AutoCloseable 
public final class RecordingFile
extends Object
implements Closeable

A recording file.

The following example shows how read and print all events in a recording file. 

try (RecordingFile recordingFile = new RecordingFile(Paths.get("recording.jfr"))) {
   while (recordingFile.hasMoreEvents()) {
     RecordedEvent event = recordingFile.readEvent();
     System.out.println(event);
   }
 }
Since:
9

Constructors

Constructor Description
RecordingFile​(Path file)

Creates a recording file.

Methods

Modifier and Type Method Description
void close()

Closes this recording file and releases any system resources that are associated with it.
boolean hasMoreEvents()

Returns true if unread events exist in the recording file, false otherwise.
static List<RecordedEvent> readAllEvents​(Path path)

Returns a list of all events in a file.
RecordedEvent readEvent()

Reads the next event in the recording.
List<EventType> readEventTypes()

Returns a list of all event types in this recording.

Methods declared in class java.lang.Object

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

Constructors

RecordingFile

public RecordingFile(Path file)
              throws IOException

Creates a recording file.

Parameters:
file - the path of the file to open, not null
Throws:
IOException - if it's not a valid recording file, or an I/O error occurred
NoSuchFileException - if the file can't be located
SecurityException - if a security manager exists and its checkRead method denies read access to the file.

Methods

readEvent

public RecordedEvent readEvent()
                        throws IOException

Reads the next event in the recording.

Returns:
the next event, not null
Throws:
EOFException - if no more events exist in the recording file
IOException - if an I/O error occurs.
See Also:
hasMoreEvents()

hasMoreEvents

public boolean hasMoreEvents()

Returns true if unread events exist in the recording file, false otherwise.

Returns:
true if unread events exist in the recording, false otherwise.

readEventTypes

public List<EventType> readEventTypes()
                               throws IOException

Returns a list of all event types in this recording.

Returns:
a list of event types, not null
Throws:
IOException - if an I/O error occurred while reading from the file
See Also:
hasMoreEvents()

close

public void close()
           throws IOException

Closes this recording file and releases any system resources that are associated with it.

Specified by:
close in interface AutoCloseable
Specified by:
close in interface Closeable
Throws:
IOException - if an I/O error occurred

readAllEvents

public static List<RecordedEvent> readAllEvents(Path path)
                                         throws IOException

Returns a list of all events in a file.

This method is intended for simple cases where it's convenient to read all events in a single operation. It isn't intended for reading large files.

Parameters:
path - the path to the file, not null
Returns:
the events from the file as a List object; whether the List is modifiable or not is implementation dependent and therefore not specified, not null
Throws:
IOException - if an I/O error occurred, it's not a Flight Recorder file or a version of a JFR file that can't be parsed
SecurityException - if a security manager exists and its checkRead method denies read access to the file.

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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.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
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https://docs.oracle.com/en/java/javase/11/docs/api/jdk.jfr/jdk/jfr/consumer/RecordingFile.html