mirror of https://gitee.com/bigwinds/arangodb
189 lines
7.3 KiB
C++
189 lines
7.3 KiB
C++
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief headers
|
|
///
|
|
/// @file
|
|
///
|
|
/// DISCLAIMER
|
|
///
|
|
/// Copyright 2014 ArangoDB GmbH, Cologne, Germany
|
|
/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
|
|
///
|
|
/// Licensed under the Apache License, Version 2.0 (the "License");
|
|
/// you may not use this file except in compliance with the License.
|
|
/// You may obtain a copy of the License at
|
|
///
|
|
/// http://www.apache.org/licenses/LICENSE-2.0
|
|
///
|
|
/// Unless required by applicable law or agreed to in writing, software
|
|
/// distributed under the License is distributed on an "AS IS" BASIS,
|
|
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
/// See the License for the specific language governing permissions and
|
|
/// limitations under the License.
|
|
///
|
|
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
|
|
///
|
|
/// @author Dr. Frank Celler
|
|
/// @author Copyright 2014, ArangoDB GmbH, Cologne, Germany
|
|
/// @author Copyright 2011-2013, triAGENS GmbH, Cologne, Germany
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef ARANGODB_VOC_BASE_HEADERS_H
|
|
#define ARANGODB_VOC_BASE_HEADERS_H 1
|
|
|
|
#include "Basics/Common.h"
|
|
#include "VocBase/document-collection.h"
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// --SECTION-- class TRI_headers_t
|
|
// -----------------------------------------------------------------------------
|
|
|
|
class TRI_headers_t {
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// --SECTION-- constructors & destructors
|
|
// -----------------------------------------------------------------------------
|
|
|
|
public:
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief creates the headers
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
TRI_headers_t ();
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief destroys the headers
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
~TRI_headers_t ();
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// --SECTION-- public functions
|
|
// -----------------------------------------------------------------------------
|
|
|
|
public:
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief returns the number of allocated headers
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
size_t numAllocated () const {
|
|
return _nrAllocated;
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief returns the memory usage
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
size_t memory () const {
|
|
return _nrAllocated * sizeof(TRI_doc_mptr_t);
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief move an existing header to the end of the linked list
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
void moveBack (TRI_doc_mptr_t*, TRI_doc_mptr_t*);
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief unlink an existing header from the linked list, without freeing it
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
void unlink (TRI_doc_mptr_t*);
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief move an existing header to another position in the linked list
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
void move (TRI_doc_mptr_t*, TRI_doc_mptr_t*);
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief relink an existing header into the linked list, at its original
|
|
/// position
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
void relink (TRI_doc_mptr_t*, TRI_doc_mptr_t*);
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief request a new header
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
TRI_doc_mptr_t* request (size_t);
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief release/free an existing header, putting it back onto the freelist
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
void release (TRI_doc_mptr_t*, bool unlink);
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief adjust the total size (called by the collector when changing WAL
|
|
/// markers into datafile markers)
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
void adjustTotalSize (int64_t, int64_t);
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief return the element at the head of the list
|
|
///
|
|
/// note: the element returned might be nullptr
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
inline TRI_doc_mptr_t* front () const {
|
|
return _begin;
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief return the element at the tail of the list
|
|
///
|
|
/// note: the element returned might be nullptr
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
inline TRI_doc_mptr_t* back () const {
|
|
return _end;
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief return the number of active headers
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
inline size_t count () const {
|
|
return _nrLinked;
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief return the total size of linked headers
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
inline int64_t size () const {
|
|
return _totalSize;
|
|
}
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// --SECTION-- private variables
|
|
// -----------------------------------------------------------------------------
|
|
|
|
private:
|
|
|
|
TRI_doc_mptr_t const* _freelist; // free headers
|
|
|
|
TRI_doc_mptr_t* _begin; // start pointer to list of allocated headers
|
|
TRI_doc_mptr_t* _end; // end pointer to list of allocated headers
|
|
size_t _nrAllocated; // number of allocated headers
|
|
size_t _nrLinked; // number of linked headers
|
|
int64_t _totalSize; // total size of markers for linked headers
|
|
|
|
std::vector<TRI_doc_mptr_t const*> _blocks;
|
|
};
|
|
|
|
#endif
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// --SECTION-- END-OF-FILE
|
|
// -----------------------------------------------------------------------------
|
|
|
|
// Local Variables:
|
|
// mode: outline-minor
|
|
// outline-regexp: "/// @brief\\|/// {@inheritDoc}\\|/// @page\\|// --SECTION--\\|/// @\\}"
|
|
// End:
|