--- /dev/null	2017-11-09 09:38:01.297999907 +0100
+++ new/src/hotspot/share/jfr/recorder/stringpool/jfrStringPoolWriter.cpp	2018-04-09 15:20:00.429607250 +0200
@@ -0,0 +1,50 @@
+/*
+ * 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.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "jfr/recorder/stringpool/jfrStringPool.hpp"
+#include "jfr/recorder/stringpool/jfrStringPoolWriter.hpp"
+#include "jfr/writers/jfrEventWriterHost.inline.hpp"
+#include "jfr/writers/jfrMemoryWriterHost.inline.hpp"
+
+JfrStringPoolFlush::JfrStringPoolFlush(Type* old, size_t used, size_t requested, Thread* t) :
+  _result(JfrStringPool::flush(old, used, requested, t)) {}
+
+JfrStringPoolWriter::JfrStringPoolWriter(Thread* thread) :
+  JfrStringPoolWriterBase(JfrStringPool::lease_buffer(thread), thread), _nof_strings(0) {}
+
+JfrStringPoolWriter::~JfrStringPoolWriter() {
+  assert(this->is_acquired(), "invariant");
+  if (!this->is_valid() || this->used_size() == 0) {
+    return;
+  }
+  assert(this->used_size() > 0, "invariant");
+  this->storage()->increment(_nof_strings);
+  this->commit();
+  assert(0 == this->current_offset(), "invariant");
+}
+
+void JfrStringPoolWriter::inc_nof_strings() {
+  ++_nof_strings;
+}