/*
 * Copyright (c) 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_VM_GC_G1_MEMORY_NODE_MANAGER_HPP
#define SHARE_VM_GC_G1_MEMORY_NODE_MANAGER_HPP

#include "memory/allocation.hpp"
#include "runtime/os.hpp"

// Helper class to manage memory nodes.
// G1MemoryMultiNodeManager will be created if UseNUMA is enabled and active
// NUMA nodes are more than one. Otherwise, G1MemoryNodeManager will be created.
class G1MemoryNodeManager : public CHeapObj<mtGC> {
  static G1MemoryNodeManager* _inst;

public:
  static const uint InvalidNodeIndex = (uint)os::InvalidId;
  static const uint AnyNodeIndex = (uint)os::AnyId;

  static G1MemoryNodeManager* mgr() { return _inst; }

  static G1MemoryNodeManager* create();

  virtual ~G1MemoryNodeManager() { }

  // Set page size of Java Heap.
  virtual void set_page_size(size_t page_size) { }

  // Print current active memory node count.
  virtual uint num_active_nodes() const { return 1; }

  // Returns memory node ids
  virtual const int* node_ids() const { static int dummy_id = 0; return &dummy_id; }

  virtual uint index_of_current_thread() const { return 0; }

  // If the given node index is valid return same index,
  // If it is not valid, generate valid random index.
  virtual uint valid_node_index(uint node_index) const { return 0; }

  virtual bool is_valid_node_index(uint node_index) const {
    // Single node index should be always 0.
    return node_index == 0;
  }

  // Retrieve node index of the given address.
  virtual uint index_of_address(HeapWord* addr) const { return 0; }
};

#endif // SHARE_VM_GC_G1_MEMORY_NODE_MANAGER_HPP