diff -r 2c3cc4b01880 -r c16ac7a2eba4 src/hotspot/share/jfr/recorder/stacktrace/jfrStackTraceRepository.hpp
--- a/src/hotspot/share/jfr/recorder/stacktrace/jfrStackTraceRepository.hpp	Wed Oct 30 16:14:56 2019 +0100
+++ b/src/hotspot/share/jfr/recorder/stacktrace/jfrStackTraceRepository.hpp	Wed Oct 30 19:43:52 2019 +0100
@@ -40,7 +40,7 @@
   friend class ObjectSampleCheckpoint;
   friend class ObjectSampler;
   friend class StackTraceBlobInstaller;
-  friend class WriteStackTraceRepository;
+  friend class StackTraceRepository;
 
  private:
   static const u4 TABLE_SIZE = 2053;
@@ -51,19 +51,18 @@
   JfrStackTraceRepository();
   static JfrStackTraceRepository& instance();
   static JfrStackTraceRepository* create();
+  static void destroy();
   bool initialize();
-  static void destroy();
 
-  size_t write_impl(JfrChunkWriter& cw, bool clear);
-  static void write_metadata(JfrCheckpointWriter& cpw);
-  traceid write(JfrCheckpointWriter& cpw, traceid id, unsigned int hash);
+  bool is_modified() const;
   size_t write(JfrChunkWriter& cw, bool clear);
   size_t clear();
 
+  const JfrStackTrace* lookup(unsigned int hash, traceid id) const;
+
   traceid add_trace(const JfrStackTrace& stacktrace);
   static traceid add(const JfrStackTrace& stacktrace);
   traceid record_for(JavaThread* thread, int skip, JfrStackFrame* frames, u4 max_frames);
-  const JfrStackTrace* lookup(unsigned int hash, traceid id) const;
 
  public:
   static traceid record(Thread* thread, int skip = 0);