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/*
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* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.jfr.api.consumer.streaming;
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import java.io.FileWriter;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.text.ParseException;
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import java.time.Duration;
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import java.util.ArrayDeque;
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import jdk.jfr.Configuration;
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import jdk.jfr.EventType;
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import jdk.jfr.ValueDescriptor;
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import jdk.jfr.consumer.RecordingStream;
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class UseCasesStream {
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//
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// Use case: Out-of-the-Box Experience
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//
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// - Simple things should be simple
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// - Pique interest, i.e. a one-liner on Stack Overflow
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// - Few lines of code as possible
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// - Should be easier than alternative technologies, like JMX and JVM TI
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//
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// - Non-goals: Corner-cases, advanced configuration, releasing resources
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//
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public static void outOfTheBox() throws InterruptedException {
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try (RecordingStream rs = new RecordingStream()) {
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rs.enable("jdk.ExceptionThrown");
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rs.onEvent(e -> System.out.println(e.getString("message")));
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rs.start();
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}
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// EventStream.start("jdk.JavaMonitorEnter", "threshold", "20 ms",
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// "stackTrace", "false")
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// .addConsumer(System.out::println);
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//
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// EventStream.start("jdk.CPULoad", "period", "1 s")
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// .addConsumer(e -> System.out.println(100 *
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// e.getDouble("totalMachine") + " %"));
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//
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// EventStream.start("jdk.GarbageCollection")
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// .addConsumer(e -> System.out.println("GC: " + e.getStartTime() + "
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// maxPauseTime=" + e.getDuration("maxPauseTime").toMillis() + " ms"));
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Thread.sleep(100_000);
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}
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// Use case: Event Forwarding
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//
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// - Forward arbitrary event to frameworks such as RxJava, JSON/XML and
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// Kafka
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// - Handle flooding
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// - Performant
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// - Graceful shutdown
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// - Non-goals: Filter events
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//
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public static void eventForwarding() throws InterruptedException, IOException, ParseException {
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// KafkaProducer producer = new KafkaProducer<String, String>();
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try (RecordingStream rs = new RecordingStream(Configuration.getConfiguration("default"))) {
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rs.setMaxAge(Duration.ofMinutes(5));
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rs.setMaxSize(1000_000_000L);
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// es.setParallel(true);
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// es.setReuse(true);
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// es.consume(e -> producer.send(new ProducerRecord<String,
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// String>("topic",
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// e.getString("key"), e.getString("value"))));
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rs.start();
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}
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// Write primitive values to XML
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try (RecordingStream rs = new RecordingStream(Configuration.getConfiguration("deafult"))) {
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try (PrintWriter p = new PrintWriter(new FileWriter("recording.xml"))) {
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// es.setParallel(false);
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// es.setReuse(true);
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p.println("<?xml version=\"1.0\" encoding=\"UTF-8\" ?>");
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p.println("<events>");
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rs.onEvent(e -> {
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EventType type = e.getEventType();
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p.println(" <event type=\"" + type.getName() + "\" start=\"" + e.getStartTime() + "\" end=\"" + e.getEndTime() + "\">");
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for (ValueDescriptor field : e.getEventType().getFields()) {
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Object value = e.getValue(field.getName());
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if (value instanceof Number || field.getTypeName().equals("java.lang.String")) {
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p.println(" <value field=\"" + field.getName() + "\">" + value + "</value>");
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}
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}
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});
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rs.start();
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p.println("</events>");
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}
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}
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}
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// Use case: Repository Access
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//
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// - Read the disk repository from another process, for example a side car
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// in
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// Docker container
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// - Be able to configure flush interval from command line or jcmd.
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// - Graceful shutdown
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//
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public static void repositoryAccess() throws IOException, InterruptedException {
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Path repository = Paths.get("c:\\repository").toAbsolutePath();
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String command = new String();
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command += "java -XX:StartFlightRecording:flush=2s";
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command += "-XX:FlightRecorderOption:repository=" + repository + " Application";
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Process myProcess = Runtime.getRuntime().exec(command);
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try (RecordingStream rs = new RecordingStream()) {
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rs.onEvent(System.out::println);
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rs.startAsync();
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Thread.sleep(10_000);
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myProcess.destroy();
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Thread.sleep(10_000);
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}
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}
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// Use: Tooling
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//
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// - Monitor a stream of data for a very long time
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// - Predictable interval, i.e. once every second
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// - Notification with minimal delay
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// - Events with the same period should arrive together
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// - Consume events in chronological order
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// - Low overhead
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//
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public static void tooling() throws IOException, ParseException {
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ArrayDeque<Double> measurements = new ArrayDeque<>();
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try (RecordingStream rs = new RecordingStream(Configuration.getConfiguration("profile"))) {
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rs.setInterval(Duration.ofSeconds(1));
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rs.setMaxAge(Duration.ofMinutes(1));
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// rs.setOrdered(true);
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// rs.setReuse(false);
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// rs.setParallel(true);
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rs.onEvent("jdk.CPULoad", e -> {
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double d = e.getDouble("totalMachine");
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measurements.addFirst(d);
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if (measurements.size() > 60) {
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measurements.removeLast();
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}
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// repaint();
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});
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rs.start();
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}
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}
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// Use case: Low Impact
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//
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// - Support event subscriptions in a low latency environment (minimal GC
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// pauses)
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// - Filter out relevant events to minimize disk overhead and allocation
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// pressure
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// - Avoid impact from other recordings
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// - Avoid Heisenberg effects, in particular self-recursion
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//
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// Non-goals: one-liner
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//
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public static void lowImpact() throws InterruptedException, IOException, ParseException {
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try (RecordingStream rs = new RecordingStream()) {
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rs.enable("jdk.JavaMonitorEnter#threshold").withThreshold(Duration.ofMillis(10));
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rs.enable("jdk.ExceptionThrow#enabled");
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// ep.setReuse(true);
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rs.onEvent("jdk.JavaMonitorEnter", System.out::println);
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rs.onEvent("jdk.ExceptionThrow", System.out::println);
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rs.start();
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;
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}
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}
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}
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