mirror of https://gitee.com/bigwinds/arangodb
147 lines
4.3 KiB
C++
147 lines
4.3 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief transaction markers
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///
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/// @file
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///
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/// DISCLAIMER
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///
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/// Copyright 2004-2013 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is triAGENS GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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/// @author Copyright 2011-2013, triAGENS GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#ifndef TRIAGENS_TRANSACTION_MARKER_H
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#define TRIAGENS_TRANSACTION_MARKER_H 1
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#include "Basics/Common.h"
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#include "Basics/BsonHelper.h"
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#include "VocBase/datafile.h"
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namespace triagens {
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namespace transaction {
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struct Marker {
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Marker (TRI_df_marker_type_e type,
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size_t size)
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: buffer(new char[sizeof(TRI_df_marker_t) + size]),
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size(sizeof(TRI_df_marker_t) + size) {
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// initialise the marker header
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auto h = header();
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h->_type = type;
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h->_size = static_cast<TRI_voc_size_t>(size);
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h->_crc = 0;
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h->_tick = 0;
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}
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virtual ~Marker () {
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if (buffer != nullptr) {
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delete buffer;
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}
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}
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inline TRI_df_marker_t* header () const {
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return (TRI_df_marker_t*) buffer;
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}
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inline char* data () const {
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return (char*) buffer + sizeof(TRI_df_marker_t);
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}
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inline void advance (char*& ptr, size_t length) {
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ptr += length;
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}
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template <typename T> void store (char*& ptr, T value) {
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*((T*) ptr) = value;
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advance(ptr, sizeof(T));
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}
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void store (char*& ptr, char const* src, size_t length) {
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memcpy(ptr, src, length);
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advance(ptr, length);
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}
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char* buffer;
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uint32_t const size;
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};
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struct DocumentMarker : public Marker {
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DocumentMarker (TRI_voc_tick_t databaseId,
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TRI_voc_cid_t collectionId,
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TRI_voc_tid_t transactionId,
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std::string const& key,
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TRI_voc_tick_t revision,
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triagens::basics::Bson const& document)
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: Marker(TRI_WAL_MARKER_DOCUMENT,
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sizeof(TRI_voc_tick_t) + sizeof(TRI_voc_cid_t) + sizeof(TRI_voc_tid_t) + sizeof(TRI_voc_tick_t) + key.size() + 2 + document.getSize()) {
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char* p = data();
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store<TRI_voc_tick_t>(p, databaseId);
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store<TRI_voc_cid_t>(p, collectionId);
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store<TRI_voc_tid_t>(p, transactionId);
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store<TRI_voc_tick_t>(p, revision);
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// store key
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store<uint8_t>(p, (uint8_t) key.size());
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store(p, key.c_str(), key.size());
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store<unsigned char>(p, '\0');
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// store bson
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store(p, (char const*) document.getBuffer(), static_cast<size_t>(document.getSize()));
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}
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~DocumentMarker () {
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}
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};
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struct RemoveMarker : public Marker {
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RemoveMarker (TRI_voc_tick_t databaseId,
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TRI_voc_cid_t collectionId,
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TRI_voc_tid_t transactionId,
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std::string const& key)
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: Marker(TRI_WAL_MARKER_REMOVE,
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sizeof(TRI_voc_tick_t) + sizeof(TRI_voc_cid_t) + sizeof(TRI_voc_tid_t) + key.size() + 2) {
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char* p = data();
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store<TRI_voc_tick_t>(p, databaseId);
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store<TRI_voc_cid_t>(p, collectionId);
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store<TRI_voc_tid_t>(p, transactionId);
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// store key
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store<uint8_t>(p, (uint8_t) key.size());
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store(p, key.c_str(), key.size());
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store<unsigned char>(p, '\0');
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}
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~RemoveMarker () {
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}
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};
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}
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}
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#endif
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// Local Variables:
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// mode: outline-minor
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// outline-regexp: "/// @brief\\|/// {@inheritDoc}\\|/// @addtogroup\\|/// @page\\|// --SECTION--\\|/// @\\}"
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// End:
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