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TestCrossProcessStreaming.java
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TestCrossProcessStreaming.java
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/*
* Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package jdk.jfr.api.consumer.streaming;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.time.Duration;
import java.time.Instant;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;
import com.sun.tools.attach.VirtualMachine;
import jdk.jfr.Event;
import jdk.jfr.Name;
import jdk.jfr.Recording;
import jdk.jfr.consumer.EventStream;
import jdk.test.lib.Asserts;
import jdk.test.lib.process.ProcessTools;
/**
* @test
* @summary Test scenario where JFR event producer is in a different process
* with respect to the JFR event stream consumer.
* @key jfr
* @requires vm.hasJFR
* @library /test/lib /test/jdk
* @modules jdk.attach
* jdk.jfr
* @run main jdk.jfr.api.consumer.streaming.TestCrossProcessStreaming
*/
// Test Sequence:
// 1. Main starts a child process "Event-Producer"
// 2. Producer process produces TestEvent1 (first batch).
// 3. Main process consumes the event stream until pre-defined number of events is consumed.
// 4. Main process signals to child process to start producing the 2nd batch of events (TestEvent2).
// 5. The second batch is produced for pre-defined number of flush intervals.
// 6. Once the main process detects the pre-defined number of flush intervals, it signals
// to the producer process to exit.
// 7. Producer process communicates the number of events in 2nd batch then exits.
// 8. Main process verifies that number of events in 2nd batch arrived as expected, and that
// producer process exited w/o error.
//
// The sequence of steps 2-5 ensures that the stream can be consumed simultaneously
// as the producer process is producing events.
public class TestCrossProcessStreaming {
@Name("Batch1")
public static class TestEvent1 extends Event {
}
@Name("Batch2")
public static class TestEvent2 extends Event {
}
@Name("Result")
public static class ResultEvent extends Event {
int batch1Count;
int batch2Count;
}
public static void main(String... args) throws Exception {
Process process = EventProducer.start();
Path repo = getJfrRepository(process);
// Consume 1000 events in a first batch
CountDownLatch consumed = new CountDownLatch(1000);
try (EventStream es = EventStream.openRepository(repo)) {
es.onEvent("Batch1", e -> consumed.countDown());
es.setStartTime(Instant.EPOCH); // read from start
es.startAsync();
consumed.await();
}
signal("second-batch");
// Consume events until 'exit' signal.
AtomicInteger total = new AtomicInteger();
AtomicInteger produced = new AtomicInteger(-1);
AtomicReference<Exception> exception = new AtomicReference();
try (EventStream es = EventStream.openRepository(repo)) {
es.onEvent("Batch2", e -> {
try {
if (total.incrementAndGet() == 1000) {
signal("exit");
}
} catch (Exception exc) {
exception.set(exc);
}
});
es.onEvent("Result",e -> {
produced.set(e.getInt("batch2Count"));
es.close();
});
es.setStartTime(Instant.EPOCH);
es.start();
}
process.waitFor();
if (exception.get() != null) {
throw exception.get();
}
Asserts.assertEquals(process.exitValue(), 0, "Incorrect exit value");
Asserts.assertEquals(total.get(), produced.get(), "Missing events");
}
static class EventProducer {
static Process start() throws Exception {
String[] args = {"-XX:StartFlightRecording", EventProducer.class.getName()};
ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(false, args);
return ProcessTools.startProcess("Event-Producer", pb);
}
public static void main(String... args) throws Exception {
ResultEvent rs = new ResultEvent();
rs.batch1Count = emit(TestEvent1.class, "second-batch");
rs.batch2Count = emit(TestEvent2.class, "exit");
rs.commit();
}
static int emit(Class<? extends Event> eventClass, String termination) throws Exception {
int count = 0;
while (true) {
Event event = eventClass.getConstructor().newInstance();
event.commit();
count++;
if (count % 1000 == 0) {
Thread.sleep(100);
if (signalCheck(termination)) {
System.out.println("Events generated: " + count);
return count;
}
}
}
}
}
static void signal(String name) throws Exception {
Files.createFile(Paths.get(".", name));
}
static boolean signalCheck(String name) throws Exception {
return Files.exists(Paths.get(".", name));
}
static Path getJfrRepository(Process p) throws Exception {
VirtualMachine vm = VirtualMachine.attach(String.valueOf(p.pid()));
while (true) {
String repo = vm.getSystemProperties().getProperty("jdk.jfr.repository");
if (repo != null) {
vm.detach();
System.out.println("JFR repository: " + repo);
return Paths.get(repo);
}
}
}
}