/*
 * Copyright (c) 2016, 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 "gc/cms/cmsGCServicabilitySupport.hpp"
#include "gc/cms/compactibleFreeListSpace.hpp"
#include "gc/cms/concurrentMarkSweepGeneration.hpp"
#include "gc/cms/parNewGeneration.hpp"
#include "gc/shared/genCollectedHeap.hpp"
#include "services/memoryManager.hpp"
#include "services/memoryPool.hpp"

class ParNewMemoryManager : public GCMemoryManager {
private:
public:
  ParNewMemoryManager() : GCMemoryManager() {}

  const char* name() { return "ParNew"; }
};

class CMSMemoryManager : public GCMemoryManager {
private:
public:
  CMSMemoryManager() : GCMemoryManager() {}

  const char* name() { return "ConcurrentMarkSweep";}
};

GCMemoryManager* CMSGCServicabilitySupport::create_minor_gc_manager() {
  return new ParNewMemoryManager();
}

GCMemoryManager* CMSGCServicabilitySupport::create_major_gc_manager() {
  return new CMSMemoryManager();
}

class CompactibleFreeListSpacePool : public CollectedMemoryPool {
private:
  CompactibleFreeListSpace* _space;
public:
  CompactibleFreeListSpacePool(CompactibleFreeListSpace* space,
                               const char* name,
                               PoolType type,
                               size_t max_size,
                               bool support_usage_threshold) :
    CollectedMemoryPool(name, type, space->capacity(), max_size,
                        support_usage_threshold), _space(space) {
  }

  MemoryUsage get_memory_usage() {
    size_t maxSize   = (available_for_allocation() ? max_size() : 0);
    size_t used      = used_in_bytes();
    size_t committed = _space->capacity();
    
    return MemoryUsage(initial_size(), used, committed, maxSize);
  }

  size_t used_in_bytes() {
    return _space->used();
  }
};

void CMSGCServicabilitySupport::add_memory_pools(GrowableArray<MemoryPool*>* pools_list,
                                                 GCMemoryManager* minor_mgr,
                                                 GCMemoryManager* major_mgr) {

  GenCollectedHeap* heap = GenCollectedHeap::heap();
  ParNewGeneration* young_gen = (ParNewGeneration*) heap->young_gen();
  ContiguousSpacePool* eden = new ContiguousSpacePool(young_gen->eden(), "Par Eden Space", MemoryPool::Heap, young_gen->max_eden_size(), false);
  SurvivorContiguousSpacePool* survivor = new SurvivorContiguousSpacePool(young_gen, "Par Survivor Space", MemoryPool::Heap, young_gen->max_survivor_size(), false);

  ConcurrentMarkSweepGeneration* cms = (ConcurrentMarkSweepGeneration*) heap->old_gen();
  CompactibleFreeListSpacePool* old = new CompactibleFreeListSpacePool(cms->cmsSpace(), "CMS Old Gen", MemoryPool::Heap, cms->reserved().byte_size(), true);

  pools_list->append(eden);
  pools_list->append(survivor);
  pools_list->append(old);

  minor_mgr->add_pool(eden);
  major_mgr->add_pool(eden);
  minor_mgr->add_pool(survivor);
  major_mgr->add_pool(survivor);
  major_mgr->add_pool(old);
}