--- /dev/null	2018-06-17 23:18:20.806999507 +0800
+++ new/test/jdk/jfr/api/flightrecorder/TestSnapshot.java	2019-01-29 11:01:08.198976744 +0800
@@ -0,0 +1,185 @@
+/*
+ * Copyright (c) 2018, 2019, 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.flightrecorder;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.time.Duration;
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.List;
+
+import jdk.jfr.FlightRecorder;
+import jdk.jfr.Recording;
+import jdk.jfr.RecordingState;
+import jdk.jfr.consumer.RecordedEvent;
+import jdk.testlibrary.Asserts;
+import jdk.testlibrary.jfr.Events;
+import jdk.testlibrary.jfr.SimpleEvent;
+
+/* @test
+ * @key jfr
+ * @library /lib/testlibrary
+ * @run main/othervm jdk.jfr.api.flightrecorder.TestSnapshot
+ */
+public class TestSnapshot {
+    private final static int RECORDING_COUNT = 5;
+
+    public static void main(String[] args) throws Exception {
+        testEmpty();
+        testStopped();
+        testOngoingDisk();
+        testOngoingMemory();
+        testMultiple();
+    }
+
+    private static void testMultiple() throws IOException {
+        FlightRecorder recorder = FlightRecorder.getFlightRecorder();
+        List<Recording> recordings = new ArrayList<>();
+        long size = 0;
+        for (int i = 0; i < RECORDING_COUNT; i++) {
+            Recording r = new Recording();
+            r.enable(SimpleEvent.class);
+            r.start();
+            SimpleEvent se = new SimpleEvent();
+            se.commit();
+            r.stop();
+            recordings.add(r);
+            size += r.getSize();
+        }
+        try (Recording snapshot = recorder.takeSnapshot()) {
+            Asserts.assertEquals(snapshot.getSize(), size);
+            Asserts.assertGreaterThanOrEqual(snapshot.getStartTime(), recordings.get(0).getStartTime());
+            Asserts.assertLessThanOrEqual(snapshot.getStopTime(), recordings.get(RECORDING_COUNT - 1).getStopTime());
+            Asserts.assertGreaterThanOrEqual(snapshot.getDuration(), Duration.ZERO);
+            assertStaticOptions(snapshot);
+            try (InputStream is = snapshot.getStream(null, null)) {
+                Asserts.assertNotNull(is);
+            }
+
+            List<RecordedEvent> events = Events.fromRecording(snapshot);
+            Events.hasEvents(events);
+            Asserts.assertEquals(events.size(), RECORDING_COUNT);
+            for (int i = 0; i < RECORDING_COUNT; i++) {
+                Asserts.assertEquals(events.get(i).getEventType().getName(), SimpleEvent.class.getName());
+            }
+        }
+        for (Recording r : recordings) {
+            r.close();
+        }
+    }
+    private static void testOngoingMemory() throws IOException {
+        testOngoing(false);
+    }
+
+    private static void testOngoingDisk() throws IOException {
+        testOngoing(true);
+    }
+
+    private static void testOngoing(boolean disk) throws IOException {
+        FlightRecorder recorder = FlightRecorder.getFlightRecorder();
+        try (Recording r = new Recording()) {
+            r.setToDisk(disk);
+            r.enable(SimpleEvent.class);
+            r.start();
+            SimpleEvent se = new SimpleEvent();
+            se.commit();
+
+            try (Recording snapshot = recorder.takeSnapshot()) {
+
+                Asserts.assertGreaterThan(snapshot.getSize(), 0L);
+                Asserts.assertGreaterThanOrEqual(snapshot.getStartTime(), r.getStartTime());
+                Asserts.assertGreaterThanOrEqual(snapshot.getStopTime(), r.getStartTime());
+                Asserts.assertGreaterThanOrEqual(snapshot.getDuration(), Duration.ZERO);
+                assertStaticOptions(snapshot);
+                try (InputStream is = snapshot.getStream(null, null)) {
+                    Asserts.assertNotNull(is);
+                }
+
+                List<RecordedEvent> events = Events.fromRecording(snapshot);
+                Events.hasEvents(events);
+                Asserts.assertEquals(events.size(), 1);
+                Asserts.assertEquals(events.get(0).getEventType().getName(), SimpleEvent.class.getName());
+            }
+
+            r.stop();
+        }
+    }
+
+    private static void assertStaticOptions(Recording snapshot) {
+        Asserts.assertTrue(snapshot.getName().startsWith("Snapshot"), "Recording name should begin with 'Snapshot'");
+        Asserts.assertEquals(snapshot.getMaxAge(), null);
+        Asserts.assertEquals(snapshot.getMaxSize(), 0L);
+        Asserts.assertTrue(snapshot.getSettings().isEmpty());
+        Asserts.assertEquals(snapshot.getState(), RecordingState.STOPPED);
+        Asserts.assertEquals(snapshot.getDumpOnExit(), false);
+        Asserts.assertEquals(snapshot.getDestination(), null);
+    }
+
+    private static void testStopped() throws IOException {
+        FlightRecorder recorder = FlightRecorder.getFlightRecorder();
+        try (Recording r = new Recording()) {
+            r.enable(SimpleEvent.class);
+            r.start();
+            SimpleEvent se = new SimpleEvent();
+            se.commit();
+            r.stop();
+
+            try (Recording snapshot = recorder.takeSnapshot()) {
+
+                Asserts.assertEquals(snapshot.getSize(), r.getSize());
+                Asserts.assertGreaterThanOrEqual(snapshot.getStartTime(), r.getStartTime());
+                Asserts.assertLessThanOrEqual(snapshot.getStopTime(), r.getStopTime());
+                Asserts.assertGreaterThanOrEqual(snapshot.getDuration(), Duration.ZERO);
+                assertStaticOptions(snapshot);
+                try (InputStream is = snapshot.getStream(null, null)) {
+                    Asserts.assertNotNull(is);
+                }
+
+                List<RecordedEvent> events = Events.fromRecording(snapshot);
+                Events.hasEvents(events);
+                Asserts.assertEquals(events.size(), 1);
+                Asserts.assertEquals(events.get(0).getEventType().getName(), SimpleEvent.class.getName());
+            }
+        }
+    }
+
+    private static void testEmpty() throws IOException {
+        FlightRecorder recorder = FlightRecorder.getFlightRecorder();
+        Instant before = Instant.now().minusNanos(1);
+        try (Recording snapshot = recorder.takeSnapshot()) {
+            Instant after = Instant.now().plusNanos(1);
+            Asserts.assertEquals(snapshot.getSize(), 0L);
+            Asserts.assertLessThan(before, snapshot.getStartTime());
+            Asserts.assertGreaterThan(after, snapshot.getStopTime());
+            Asserts.assertEquals(snapshot.getStartTime(), snapshot.getStopTime());
+            Asserts.assertEquals(snapshot.getDuration(), Duration.ZERO);
+            assertStaticOptions(snapshot);
+            Asserts.assertEquals(snapshot.getStream(null, null), null);
+        }
+    }
+
+}