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Quelle jfrSerializer.hpp

Sprache: C

/*
* Copyright (c) 2016, 2019, 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.
*
*/

#ifndef SHARE_JFR_METADATA_JFRSERIALIZER_HPP
#define SHARE_JFR_METADATA_JFRSERIALIZER_HPP

#include "memory/allocation.hpp"
#include "jfr/recorder/checkpoint/jfrCheckpointWriter.hpp"
#include "jfrfiles/jfrTypes.hpp"

/*
* A "type" in Jfr is a binary relation defined by enumerating a set of <key, value> ordered pairs:
*
* { <1, myvalue>, <2, mysecondvalue>, ... }
*
* The key should be a type relative unique id. A value is an instance of the type.
*
* By defining and registering a type, keys can be written to event fields and the
* framework will maintain the mapping to the corresponding value (if you register as below).
*
* Inherit JfrSerializer, create a CHeapObj instance and then use JfrSerializer::register_serializer(...) to register.
* Once registered, the ownership of the serializer instance is transferred to Jfr.
*
* How to register:
*
* bool register_serializer(JfrTypeId id, bool require_safepoint, bool permit_cache, JfrSerializer* serializer)
*
* The type identifiers are machine generated into an enum located in jfrfiles/jfrTypes.hpp (included).
*
*  enum JfrTypeId {
*    ...
*    TYPE_THREADGROUP,
*    TYPE_CLASSLOADER,
*    TYPE_METHOD,
*    TYPE_SYMBOL,
*    TYPE_THREADSTATE,
*    TYPE_INFLATECAUSE,
*    ...
*
* id                 this is the id of the type your are defining (see the enum above).
* require_safepoint  indicate if your type need to be evaluated and serialized under a safepoint.
* permit_cache       indicate if your type constants are stable to be cached.
*                    (implies the callback is invoked only once and the contents will be cached. Set this to true for static information).
* serializer         the serializer instance.
*
* See below for guidance about how to implement serialize().
*
*/
class JfrSerializer : public CHeapObj<mtTracing> {
public:
  virtual ~JfrSerializer() {}
  virtual void on_rotation() {}
  static bool register_serializer(JfrTypeId id, bool permit_cache, JfrSerializer* serializer);
  virtual void serialize(JfrCheckpointWriter& writer) = 0;
};

/*
* Defining serialize(JfrCheckpointWriter& writer):
*
*  Invoke writer.write_count(N) for the number of ordered pairs (cardinality) to be defined.
*
*  You then write each individual ordered pair, <key, value> ...
*
*  Here is a simple example, describing a type defining string constants:
*
*  void MyType::serialize(JfrCheckpointWriter& writer) {
*    const int nof_causes = ObjectSynchronizer::inflate_cause_nof;
*    writer.write_count(nof_causes);                           // write number of ordered pairs (mappings) to follow
*    for (int i = 0; i < nof_causes; i++) {
*      writer.write_key(i);                                    // write key
*      writer.write(ObjectSynchronizer::inflate_cause_name((ObjectSynchronizer::InflateCause)i)); // write value
*    }
*  }
*
* Note that values can be complex, and can also referer to other types.
*
* Please see jfr/recorder/checkpoint/types/jfrType.cpp for reference.
*/

#endif // SHARE_JFR_METADATA_JFRSERIALIZER_HPP

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