/*

 * Copyright (c) 2016, 2018, 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_VM_JFR_SUPPORT_JFRFLUSH_HPP

#define SHARE_VM_JFR_SUPPORT_JFRFLUSH_HPP

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

#include "jfr/utilities/jfrTypes.hpp"

#include "memory/allocation.hpp"

class Thread;

class JfrFlush : public StackObj {

 public:

  typedef JfrBuffer Type;

  JfrFlush(Type* old, size_t used, size_t requested, Thread* t);

  Type* result() const { return _result; }

 private:

  Type* _result;

};

void jfr_conditional_flush(JfrEventId id, size_t size, Thread* t);

bool jfr_is_event_enabled(JfrEventId id);

bool jfr_has_stacktrace_enabled(JfrEventId id);

bool jfr_save_stacktrace(Thread* t);

void jfr_clear_stacktrace(Thread* t);

template <typename Event>

class JfrConditionalFlush {

 public:

  typedef JfrBuffer Type;

  JfrConditionalFlush(Thread* t) {

    if (jfr_is_event_enabled(Event::eventId)) {

      jfr_conditional_flush(Event::eventId, sizeof(Event), t);

    }

  }

};

template <typename Event>

class JfrConditionalFlushWithStacktrace : public JfrConditionalFlush<Event> {

  Thread* _t;

  bool _owner;

 public:

  JfrConditionalFlushWithStacktrace(Thread* t) : JfrConditionalFlush<Event>(t), _t(t), _owner(false) {

    if (Event::has_stacktrace() && jfr_has_stacktrace_enabled(Event::eventId)) {

      _owner = jfr_save_stacktrace(t);

    }

  }

  ~JfrConditionalFlushWithStacktrace() {

    if (_owner) {

      jfr_clear_stacktrace(_t);

    }

  }

};

#endif // SHARE_VM_JFR_SUPPORT_JFRFLUSH_HPP