--- /dev/null	2019-01-28 17:47:28.000000000 +0800
+++ new/src/share/vm/jfr/recorder/repository/jfrChunkState.cpp	2019-01-28 17:47:28.000000000 +0800
@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2012, 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.
+ *
+ * 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.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "jfr/dcmd/jfrDcmds.hpp"
+#include "jfr/recorder/jfrRecorder.hpp"
+#include "jfr/recorder/repository/jfrChunkState.hpp"
+#include "jfr/recorder/repository/jfrChunkWriter.hpp"
+#include "jfr/utilities/jfrTraceTime.hpp"
+#include "jfr/utilities/jfrTimeConverter.hpp"
+#include "jfr/utilities/jfrLog.hpp"
+#include "runtime/os.hpp"
+#include "runtime/thread.hpp"
+
+JfrChunkState::JfrChunkState() :
+  _path(NULL),
+  _start_ticks(0),
+  _start_nanos(0),
+  _previous_start_ticks(0),
+  _previous_start_nanos(0),
+  _previous_checkpoint_offset(0) {}
+
+JfrChunkState::~JfrChunkState() {
+  reset();
+}
+
+void JfrChunkState::reset() {
+  if (_path != NULL) {
+    JfrCHeapObj::free(_path, strlen(_path) + 1);
+    _path = NULL;
+  }
+  set_previous_checkpoint_offset(0);
+}
+
+void JfrChunkState::set_previous_checkpoint_offset(jlong offset) {
+  _previous_checkpoint_offset = offset;
+}
+
+jlong JfrChunkState::previous_checkpoint_offset() const {
+  return _previous_checkpoint_offset;
+}
+
+jlong JfrChunkState::previous_start_ticks() const {
+  return _previous_start_ticks;
+}
+
+jlong JfrChunkState::previous_start_nanos() const {
+  return _previous_start_nanos;
+}
+
+void JfrChunkState::update_start_ticks() {
+  _start_ticks = JfrTraceTime::now().value();
+}
+
+void JfrChunkState::update_start_nanos() {
+  _start_nanos = os::javaTimeMillis() * JfrTimeConverter::NANOS_PER_MILLISEC;
+}
+
+void JfrChunkState::save_current_and_update_start_ticks() {
+  _previous_start_ticks = _start_ticks;
+  update_start_ticks();
+}
+
+void JfrChunkState::save_current_and_update_start_nanos() {
+  _previous_start_nanos = _start_nanos;
+  update_start_nanos();
+}
+
+void JfrChunkState::update_time_to_now() {
+  save_current_and_update_start_nanos();
+  save_current_and_update_start_ticks();
+}
+
+jlong JfrChunkState::last_chunk_duration() const {
+  return _start_nanos - _previous_start_nanos;
+}
+
+static char* copy_path(const char* path) {
+  assert(path != NULL, "invariant");
+  const size_t path_len = strlen(path);
+  char* new_path = JfrCHeapObj::new_array<char>(path_len + 1);
+  strncpy(new_path, path, path_len);
+  new_path[path_len] = '\0';
+  return new_path;
+}
+
+void JfrChunkState::set_path(const char* path) {
+  assert(JfrStream_lock->owned_by_self(), "invariant");
+  if (_path != NULL) {
+    JfrCHeapObj::free(_path, strlen(_path) + 1);
+    _path = NULL;
+  }
+  if (path != NULL) {
+    _path = copy_path(path);
+  }
+}
+
+const char* JfrChunkState::path() const {
+  return _path;
+}