mirror of https://gitee.com/bigwinds/arangodb
112 lines
3.9 KiB
C++
112 lines
3.9 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 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 ArangoDB GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_VOC_BASE_UPDATE_POLICY_H
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#define ARANGOD_VOC_BASE_UPDATE_POLICY_H 1
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#include "Basics/Common.h"
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#include "VocBase/vocbase.h"
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////////////////////////////////////////////////////////////////////////////////
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/// @brief update and delete policy
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////////////////////////////////////////////////////////////////////////////////
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typedef enum {
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TRI_DOC_UPDATE_ERROR,
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TRI_DOC_UPDATE_LAST_WRITE,
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TRI_DOC_UPDATE_ONLY_IF_NEWER,
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TRI_DOC_UPDATE_ILLEGAL
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} TRI_doc_update_policy_e;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief policy container
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////////////////////////////////////////////////////////////////////////////////
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class TRI_doc_update_policy_t {
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public:
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TRI_doc_update_policy_t(TRI_doc_update_policy_t const&) = delete;
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TRI_doc_update_policy_t& operator=(TRI_doc_update_policy_t const&) = delete;
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TRI_doc_update_policy_t() = delete;
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TRI_doc_update_policy_t(TRI_doc_update_policy_e policy,
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TRI_voc_rid_t expectedRid, TRI_voc_rid_t* previousRid)
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: _expectedRid(expectedRid), _previousRid(previousRid), _policy(policy) {}
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public:
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//////////////////////////////////////////////////////////////////////////////
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/// @brief update the expected revision id in an existing policy object
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//////////////////////////////////////////////////////////////////////////////
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inline void setExpectedRevision(TRI_voc_rid_t rid) { _expectedRid = rid; }
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//////////////////////////////////////////////////////////////////////////////
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/// @brief compare revision of found document with revision specified in
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/// policy
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/// this will also store the actual revision id found in the database in the
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/// context variable _previousRid, but only if this is not NULL
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//////////////////////////////////////////////////////////////////////////////
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int check(TRI_voc_rid_t actualRid) const {
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// store previous revision
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if (_previousRid != nullptr) {
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*(_previousRid) = actualRid;
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}
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// check policy
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switch (_policy) {
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case TRI_DOC_UPDATE_ERROR:
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if (_expectedRid != 0 && _expectedRid != actualRid) {
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return TRI_ERROR_ARANGO_CONFLICT;
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}
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// fallthrough
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break;
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case TRI_DOC_UPDATE_ILLEGAL:
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return TRI_ERROR_INTERNAL;
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case TRI_DOC_UPDATE_LAST_WRITE:
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return TRI_ERROR_NO_ERROR;
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case TRI_DOC_UPDATE_ONLY_IF_NEWER:
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if (actualRid > _expectedRid) {
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return TRI_ERROR_ARANGO_CONFLICT;
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}
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// fallthrough
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break;
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}
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return TRI_ERROR_NO_ERROR;
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}
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private:
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TRI_voc_rid_t _expectedRid; // the expected revision id of a document. only
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// used if set and for update/delete
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TRI_voc_rid_t* _previousRid; // a variable that the previous revsion id found
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// in the database will be pushed into. only
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// used if set and for update/delete
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TRI_doc_update_policy_e _policy; // the update policy
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};
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#endif
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