/*

 * 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.

 *

 */

#include "precompiled.hpp"

#include "jfr/recorder/jfrEventSetting.inline.hpp"

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

#include "jfr/recorder/stacktrace/jfrStackTraceRepository.hpp"

#include "jfr/support/jfrFlush.hpp"

#include "jfr/support/jfrThreadLocal.hpp"

#include "runtime/thread.inline.hpp"

#include "utilities/debug.hpp"

JfrFlush::JfrFlush(JfrStorage::Buffer* old, size_t used, size_t requested, Thread* t) :

  _result(JfrStorage::flush(old, used, requested, true, t)) {

}

template <typename T>

class LessThanHalfBufferSize : AllStatic {

public:

  static bool evaluate(T* t) {

    assert(t != NULL, "invariant");

    return t->free_size() < t->size() / 2;

  }

};

template <typename T>

class LessThanSize : AllStatic {

 public:

  static bool evaluate(T* t, size_t size) {

    assert(t != NULL, "invariant");

    return t->free_size() < size;

  }

};

bool jfr_is_event_enabled(JfrEventId id) {

  return JfrEventSetting::is_enabled(id);

}

bool jfr_has_stacktrace_enabled(JfrEventId id) {

  return JfrEventSetting::has_stacktrace(id);

}

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

  assert(jfr_is_event_enabled(id), "invariant");

  if (t->jfr_thread_local()->has_native_buffer()) {

    JfrStorage::Buffer* const buffer = t->jfr_thread_local()->native_buffer();

    if (LessThanSize<JfrStorage::Buffer>::evaluate(buffer, size)) {

      JfrFlush f(buffer, 0, 0, t);

    }

  }

}

bool jfr_save_stacktrace(Thread* t) {

  JfrThreadLocal* const tl = t->jfr_thread_local();

  if (tl->has_cached_stack_trace()) {

    return false; // no ownership

  }

  tl->set_cached_stack_trace_id(JfrStackTraceRepository::record(t));

  return true;

}

void jfr_clear_stacktrace(Thread* t) {

  t->jfr_thread_local()->clear_cached_stack_trace();

}