--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/jfr/recorder/checkpoint/jfrMetadataEvent.hpp	Tue May 15 20:24:34 2018 +0200
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2016, 2018, 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.
+ *
+ * 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.
+ *
+ */
+
+#ifndef SHARE_VM_JFR_RECORDER_CHECKPOINT_JFRMETADATAEVENT_HPP
+#define SHARE_VM_JFR_RECORDER_CHECKPOINT_JFRMETADATAEVENT_HPP
+
+#include "jni.h"
+#include "memory/allocation.hpp"
+
+class JfrChunkWriter;
+
+//
+// Metadata is continuously updated in Java as event classes are loaded / unloaded.
+// Using update(), Java stores a binary representation back to native.
+// This is for easy access on chunk finalization as well as having it readily available in the case of fatal error.
+//
+class JfrMetadataEvent : AllStatic {
+ public:
+  static void lock();
+  static void unlock();
+  static size_t write(JfrChunkWriter& writer, jlong metadata_offset);
+  static void update(jbyteArray metadata);
+};
+
+#endif // SHARE_VM_JFR_RECORDER_CHECKPOINT_JFRMETADATAEVENT_HPP