/*

 * 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

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 */

#include "jni.h"

#include "jfr/recorder/storage/jfrMemorySpace.hpp"

#include "jfr/recorder/storage/jfrMemorySpaceRetrieval.hpp"

#include "jfr/recorder/stringpool/jfrStringPoolBuffer.hpp"

class JfrChunkWriter;

class JfrStringPool;

class Mutex;

typedef JfrMemorySpace<JfrStringPoolBuffer, JfrMspaceSequentialRetrieval, JfrStringPool> JfrStringPoolMspace;

//

// Although called JfrStringPool, a more succinct description would be

// "backing storage for the string pool located in Java"

//

// There are no lookups in native, only the encoding of string constants to the stream.

//

class JfrStringPool : public JfrCHeapObj {

 public:

  static bool add(bool epoch, jlong id, jstring string, JavaThread* jt);

  size_t write();

  size_t write_at_safepoint();

  size_t clear();

  typedef JfrStringPoolMspace::Type Buffer;

 private:

  JfrStringPoolMspace* _free_list_mspace;

  Mutex* _lock;

  JfrChunkWriter& _chunkwriter;

  // mspace callback

  void register_full(Buffer* t, Thread* thread);

  void lock();

  void unlock();

  DEBUG_ONLY(bool is_locked() const;)

  static Buffer* lease_buffer(Thread* thread, size_t size = 0);

  static Buffer* flush(Buffer* old, size_t used, size_t requested, Thread* t);

  JfrStringPool(JfrChunkWriter& cw);

  ~JfrStringPool();

  static JfrStringPool& instance();

  static JfrStringPool* create(JfrChunkWriter& cw);

  bool initialize();

  static void destroy();

  friend class JfrRecorder;

  friend class JfrRecorderService;

  friend class JfrStringPoolFlush;

  friend class JfrStringPoolWriter;

  template <typename, template <typename> class, typename>

  friend class JfrMemorySpace;

};