--- /dev/null	2017-11-09 09:38:01.297999907 +0100
+++ new/src/hotspot/share/jfr/recorder/repository/jfrChunkState.hpp	2018-04-09 15:09:03.031541110 +0200
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2012, 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_REPOSITORY_JFRRCHUNKSTATE_HPP
+#define SHARE_VM_JFR_RECORDER_REPOSITORY_JFRRCHUNKSTATE_HPP
+
+#include "jni.h"
+#include "jfr/utilities/jfrAllocation.hpp"
+#include "jfr/utilities/jfrTypes.hpp"
+
+class JfrChunkState : public JfrCHeapObj {
+  friend class JfrChunkWriter;
+ private:
+  char* _path;
+  jlong _start_ticks;
+  jlong _start_nanos;
+  jlong _previous_start_ticks;
+  jlong _previous_start_nanos;
+  jlong _previous_checkpoint_offset;
+
+  void update_start_ticks();
+  void update_start_nanos();
+  void save_current_and_update_start_ticks();
+  void save_current_and_update_start_nanos();
+
+  JfrChunkState();
+  ~JfrChunkState();
+  void reset();
+  jlong previous_checkpoint_offset() const;
+  void set_previous_checkpoint_offset(jlong offset);
+  jlong previous_start_ticks() const;
+  jlong previous_start_nanos() const;
+  jlong last_chunk_duration() const;
+  void update_time_to_now();
+  void set_path(const char* path);
+  const char* path() const;
+};
+
+#endif // SHARE_VM_JFR_RECORDER_REPOSITORY_JFRRCHUNKSTATE_HPP