/*

 * Copyright (c) 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_VM_JFR_UTILITIES_JFRTHREADITERATOR_HPP

#define SHARE_VM_JFR_UTILITIES_JFRTHREADITERATOR_HPP

#include "memory/allocation.hpp"

#include "runtime/thread.hpp"

#include "runtime/threadSMR.hpp"

template <typename Adapter, typename AP = StackObj>

class JfrThreadIterator : public AP {

 private:

  Adapter _adapter;

 public:

  JfrThreadIterator() : _adapter() {}

  typename Adapter::Type* next() {

    assert(has_next(), "invariant");

    return _adapter.next();

  }

  bool has_next() const {

    return _adapter.has_next();

  }

};

class JfrJavaThreadIteratorAdapter {

 private:

  JavaThreadIteratorWithHandle _iter;

  JavaThread* _next;

 public:

  typedef JavaThread Type;

  JfrJavaThreadIteratorAdapter();

  bool has_next() const {

    return _next != NULL;

  }

  Type* next();

};

class JfrNonJavaThreadIteratorAdapter {

 private:

  NonJavaThread::Iterator _iter;

  NonJavaThread* _next;

 public:

  typedef NonJavaThread Type;

  JfrNonJavaThreadIteratorAdapter();

  bool has_next() const;

  Type* next();

};

typedef JfrThreadIterator<JfrJavaThreadIteratorAdapter, StackObj> JfrJavaThreadIterator;

typedef JfrThreadIterator<JfrNonJavaThreadIteratorAdapter, StackObj> JfrNonJavaThreadIterator;

#endif // SHARE_VM_JFR_UTILITIES_JFRTHREADITERATOR_HPP