1 /*
   2  * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_JFR_RECORDER_CHECKPOINT_JFRCHECKPOINTBLOB_HPP
  26 #define SHARE_VM_JFR_RECORDER_CHECKPOINT_JFRCHECKPOINTBLOB_HPP
  27 
  28 #include "jfr/utilities/jfrAllocation.hpp"
  29 #include "jfr/utilities/jfrRefCountPointer.hpp"
  30 
  31 class JfrCheckpointBlob;
  32 class JfrCheckpointWriter;
  33 
  34 typedef RefCountPointer<JfrCheckpointBlob, MultiThreadedRefCounter> JfrCheckpointBlobReference;
  35 typedef RefCountHandle<JfrCheckpointBlobReference> JfrCheckpointBlobHandle;
  36 
  37 class JfrCheckpointBlob : public JfrCHeapObj {
  38   template <typename, typename>
  39   friend class RefCountPointer;
  40  private:
  41   const u1* _checkpoint;
  42   const size_t _size;
  43   JfrCheckpointBlobHandle _next;
  44   mutable bool _written;
  45 
  46   JfrCheckpointBlob(const u1* checkpoint, size_t size);
  47   ~JfrCheckpointBlob();
  48   const JfrCheckpointBlobHandle& next() const;
  49   void write_this(JfrCheckpointWriter& writer) const;
  50 
  51  public:
  52   void write(JfrCheckpointWriter& writer) const;
  53   void exclusive_write(JfrCheckpointWriter& writer) const;
  54   void reset_write_state() const;
  55   void set_next(const JfrCheckpointBlobHandle& ref);
  56   static JfrCheckpointBlobHandle make(const u1* checkpoint, size_t size);
  57 };
  58 
  59 #endif // SHARE_VM_JFR_RECORDER_CHECKPOINT_JFRCHECKPOINTBLOB_HPP