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package org.graalvm.polybench;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.time.Duration;
import java.util.function.Function;
import java.util.stream.Collectors;
import jdk.jfr.FlightRecorder;
import jdk.jfr.Recording;
import jdk.jfr.consumer.RecordedEvent;
import jdk.jfr.consumer.RecordingFile;
final class JFRSupport {
private JFRSupport() {
}
static boolean isAvailable() {
try {
return FlightRecorder.isAvailable();
} catch (LinkageError e) {
// Thrown on the JDK-11 CE native-image without JFR support.
return false;
}
}
static Object startRecording(String enabledEvent) {
Recording recording = new Recording();
recording.enable(enabledEvent);
recording.setDumpOnExit(false);
recording.start();
return recording;
}
static Object snapshotRecording(Object recording) {
return ((Recording) recording).copy(true);
}
static void disposeRecording(Object recording, boolean stop) {
if (recording != null) {
Recording r = (Recording) recording;
if (stop) {
r.stop();
}
r.close();
}
}
static long computeCumulativeTime(Object recording, String eventName, String fieldName) throws IOException {
Path file = Files.createTempFile("recording", ".jfr");
try {
// Copy a JFR events snapshot into a temp file.
((Recording) recording).dump(file);
// Calculate a cumulative Truffle compilation time from all events in the snapshot.
return processRecordings(file, eventName, fieldName);
} finally {
Files.delete(file);
}
}
private static long processRecordings(Path jfrFile, String eventName, String fieldName) throws IOException {
Function<RecordedEvent, Duration> mapper = fieldName == null ? (event) -> event.getDuration() : (event) -> Duration.ofMillis(event.getLong(fieldName));
return RecordingFile.readAllEvents(jfrFile).stream()
.filter((event) -> {
return eventName.equals(event.getEventType().getName());
})
.map(mapper)
.collect(Collectors.reducing(Duration.ofNanos(0), (a, b) -> a.plus(b)))
.toMillis();
}
}