1 /*
   2  * Copyright (c) 2016, 2018, 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_JFRCHECKPOINTWRITER_HPP
  26 #define SHARE_VM_JFR_RECORDER_CHECKPOINT_JFRCHECKPOINTWRITER_HPP
  27 
  28 #include "jfr/recorder/checkpoint/jfrCheckpointBlob.hpp"
  29 #include "jfr/recorder/storage/jfrBuffer.hpp"
  30 #include "jfr/utilities/jfrTime.hpp"
  31 #include "jfr/utilities/jfrTypes.hpp"
  32 #include "jfr/writers/jfrEventWriterHost.inline.hpp"
  33 #include "jfr/writers/jfrMemoryWriterHost.inline.hpp"
  34 #include "jfr/writers/jfrStorageAdapter.hpp"
  35 
  36 class Thread;
  37 
  38 class JfrCheckpointFlush : public StackObj {
  39  public:
  40   typedef JfrBuffer Type;
  41   JfrCheckpointFlush(Type* old, size_t used, size_t requested, Thread* t);
  42   Type* result() { return _result; }
  43  private:
  44   Type* _result;
  45 };
  46 
  47 typedef Adapter<JfrCheckpointFlush> JfrCheckpointAdapter;
  48 typedef AcquireReleaseMemoryWriterHost<JfrCheckpointAdapter, StackObj > JfrTransactionalCheckpointWriter;
  49 typedef EventWriterHost<BigEndianEncoder, CompressedIntegerEncoder, JfrTransactionalCheckpointWriter> JfrCheckpointWriterBase;
  50 
  51 struct JfrCheckpointContext {
  52   jlong offset;
  53   juint count;
  54 };
  55 
  56 class JfrCheckpointWriter : public JfrCheckpointWriterBase {
  57   friend class JfrSerializerRegistration;
  58  private:
  59   JfrTicks _time;
  60   jlong _offset;
  61   juint _count;
  62   bool _flushpoint;
  63   bool _header;
  64 
  65   juint count() const;
  66   void set_count(juint count);
  67   void increment();
  68   void set_flushpoint(bool flushpoint);
  69   bool is_flushpoint() const;
  70   const u1* session_data(size_t* size, const JfrCheckpointContext* ctx = NULL);
  71   void release();
  72 
  73  public:
  74   JfrCheckpointWriter(bool flushpoint, bool header, Thread* thread);
  75   ~JfrCheckpointWriter();
  76   void write_type(JfrTypeId type_id);
  77   void write_count(u4 nof_entries);
  78   void write_count(u4 nof_entries, jlong offset);
  79   void write_key(u8 key);
  80   const JfrCheckpointContext context() const;
  81   void set_context(const JfrCheckpointContext ctx);
  82   bool has_data() const;
  83   JfrCheckpointBlobHandle checkpoint_blob();
  84   JfrCheckpointBlobHandle copy(const JfrCheckpointContext* ctx = NULL);
  85   JfrCheckpointBlobHandle move(const JfrCheckpointContext* ctx = NULL);
  86 };
  87 
  88 #endif // SHARE_VM_JFR_RECORDER_CHECKPOINT_JFRCHECKPOINTWRITER_HPP