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