/*

 * Copyright (c) 2012, 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/jni/jfrJavaSupport.hpp"

#include "jfr/recorder/repository/jfrChunkWriter.hpp"

#include "jfr/recorder/repository/jfrChunkSizeNotifier.hpp"

size_t JfrChunkSizeNotifier::_chunk_size_threshold = 0;

void JfrChunkSizeNotifier::set_chunk_size_threshold(size_t bytes) {

  _chunk_size_threshold = bytes;

}

size_t JfrChunkSizeNotifier::chunk_size_threshold() {

  return _chunk_size_threshold;

}

static jobject new_chunk_monitor = NULL;

// lazy install

static jobject get_new_chunk_monitor(Thread* thread) {

  static bool initialized = false;

  if (initialized) {

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

    return new_chunk_monitor;

  }

  assert(new_chunk_monitor == NULL, "invariant");

  // read static field

  HandleMark hm(thread);

  static const char klass[] = "jdk/jfr/internal/JVM";

  static const char field[] = "FILE_DELTA_CHANGE";

  static const char signature[] = "Ljava/lang/Object;";

  JavaValue result(T_OBJECT);

  JfrJavaArguments field_args(&result, klass, field, signature, thread);

  JfrJavaSupport::get_field_global_ref(&field_args, thread);

  new_chunk_monitor = result.get_jobject();

  initialized = new_chunk_monitor != NULL;

  return new_chunk_monitor;

}

void JfrChunkSizeNotifier::notify() {

  Thread* const thread = Thread::current();

  JfrJavaSupport::notify_all(get_new_chunk_monitor(thread), thread);

}

void JfrChunkSizeNotifier::release_monitor() {

  if (new_chunk_monitor != NULL) {

    JfrJavaSupport::destroy_global_jni_handle(new_chunk_monitor);

    new_chunk_monitor = NULL;

  }

}