--- /dev/null	2019-07-25 13:07:35.456009699 +0200
+++ new/src/hotspot/share/memory/metaspace/chunkAllocSequence.hpp	2019-07-25 15:30:03.101428664 +0200
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2018, 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.
+ *
+ */
+
+#ifndef SHARE_MEMORY_METASPACE_CHUNKALLOCSEQUENCE_HPP
+#define SHARE_MEMORY_METASPACE_CHUNKALLOCSEQUENCE_HPP
+
+#include "memory/metaspace.hpp" // For Metaspace::MetaspaceType
+#include "memory/metaspace/chunkLevel.hpp"
+#include "memory/metaspace/metaspaceEnums.hpp"
+
+namespace metaspace {
+
+
+class ChunkAllocSequence {
+public:
+
+  virtual chklvl_t get_next_chunk_level(int num_allocated) const = 0;
+
+  // Given a space type, return the correct allocation sequence to use.
+  // The returned object is static and read only.
+  static const ChunkAllocSequence* alloc_sequence_by_space_type(MetaspaceType space_type, bool is_class);
+
+};
+
+
+} // namespace metaspace
+
+#endif // SHARE_MEMORY_METASPACE_CHUNKALLOCSEQUENCE_HPP