/*

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 *

 * 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

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 */

#include "jfr/writers/jfrStreamWriterHost.hpp"

#include "runtime/os.hpp"

template <typename Adapter, typename AP>

StreamWriterHost<Adapter, AP>::StreamWriterHost(typename Adapter::StorageType* storage, Thread* thread) :

  MemoryWriterHost<Adapter, AP>(storage, thread), _stream_pos(0), _fd(invalid_fd) {

}

template <typename Adapter, typename AP>

StreamWriterHost<Adapter, AP>::StreamWriterHost(typename Adapter::StorageType* storage, size_t size) :

  MemoryWriterHost<Adapter, AP>(storage, size), _stream_pos(0), _fd(invalid_fd) {

}

template <typename Adapter, typename AP>

StreamWriterHost<Adapter, AP>::StreamWriterHost(Thread* thread) :

  MemoryWriterHost<Adapter, AP>(thread), _stream_pos(0), _fd(invalid_fd) {

}

template <typename Adapter, typename AP>

inline intptr_t StreamWriterHost<Adapter, AP>::current_stream_position() const {

  return this->used_offset() + _stream_pos;

}

template <typename Adapter, typename AP>

inline bool StreamWriterHost<Adapter, AP>::accommodate(size_t used, size_t requested) {

  if (used > 0) {

    this->flush(used);

  }

  assert(this->used_size() == 0, "invariant");

  if (this->available_size() >= requested) {

    return true;

  }

  return StorageHost<Adapter, AP>::accommodate(0, requested);

}

template <typename Adapter, typename AP>

inline void StreamWriterHost<Adapter, AP>::bytes(void* dest, const void* buf, size_t len) {

  if (len > this->available_size()) {

    this->write_unbuffered(buf, len);

    return;

  }

  MemoryWriterHost<Adapter, AP>::bytes(dest, buf, len);

}

template <typename Adapter, typename AP>

inline void StreamWriterHost<Adapter, AP>::flush(size_t size) {

  assert(size > 0, "invariant");

  assert(this->is_valid(), "invariant");

  _stream_pos += os::write(_fd, this->start_pos(), (int)size);

  StorageHost<Adapter, AP>::reset();

  assert(0 == this->used_offset(), "invariant");

}

template <typename Adapter, typename AP>

inline bool StreamWriterHost<Adapter, AP>::has_valid_fd() const {

  return invalid_fd != _fd;

}

template <typename Adapter, typename AP>

inline intptr_t StreamWriterHost<Adapter, AP>::current_offset() const {

  return current_stream_position();

}

template <typename Adapter, typename AP>

void StreamWriterHost<Adapter, AP>::seek(intptr_t offset) {

  this->flush();

  assert(0 == this->used_offset(), "can only seek from beginning");

  _stream_pos = os::seek_to_file_offset(_fd, offset);

}

template <typename Adapter, typename AP>

void StreamWriterHost<Adapter, AP>::flush() {

  if (this->is_valid()) {

    const size_t used = this->used_size();

    if (used > 0) {

      this->flush(used);

    }

  }

}

template <typename Adapter, typename AP>

void StreamWriterHost<Adapter, AP>::write_unbuffered(const void* buf, size_t len) {

  this->flush();

  assert(0 == this->used_offset(), "can only seek from beginning");

  while (len > 0) {

    const int n = MIN2<int>((int)len, INT_MAX);

    _stream_pos += os::write(_fd, buf, n);

    len -= n;

  }

}

template <typename Adapter, typename AP>

inline bool StreamWriterHost<Adapter, AP>::is_valid() const {

  return has_valid_fd();

}

template <typename Adapter, typename AP>

inline void StreamWriterHost<Adapter, AP>::close_fd() {

  assert(this->has_valid_fd(), "closing invalid fd!");

  os::close(_fd);

  _fd = invalid_fd;

}

template <typename Adapter, typename AP>

inline void StreamWriterHost<Adapter, AP>::reset(fio_fd fd) {

  assert(!this->has_valid_fd(), "invariant");

  _fd = fd;

  _stream_pos = 0;

  this->hard_reset();

}