mirror of https://gitee.com/bigwinds/arangodb
104 lines
3.2 KiB
C++
104 lines
3.2 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2017 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_ACCESS_MODE_H
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#define ARANGOD_VOC_BASE_ACCESS_MODE_H 1
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#include "Basics/Common.h"
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#include "Basics/Exceptions.h"
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#include <cstring>
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namespace arangodb {
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struct AccessMode {
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enum class Type { NONE = 0, READ = 1, WRITE = 2, EXCLUSIVE = 4 };
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// no need to create an object of it
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AccessMode() = delete;
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static_assert(AccessMode::Type::NONE < AccessMode::Type::READ &&
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AccessMode::Type::READ < AccessMode::Type::WRITE &&
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AccessMode::Type::WRITE < AccessMode::Type::EXCLUSIVE,
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"AccessMode::Type total order fail");
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static bool isNone(Type type) { return (type == Type::NONE); }
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static bool isRead(Type type) { return (type == Type::READ); }
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static bool isWrite(Type type) { return (type == Type::WRITE); }
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static bool isExclusive(Type type) { return (type == Type::EXCLUSIVE); }
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static bool isWriteOrExclusive(Type type) {
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return (isWrite(type) || isExclusive(type));
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}
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/// @brief checks if the type of the two modes is different
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/// this will intentially treat EXCLUSIVE the same as WRITE
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static bool isReadWriteChange(Type lhs, Type rhs) {
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return ((isWriteOrExclusive(lhs) && !isWriteOrExclusive(rhs)) ||
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(!isWriteOrExclusive(lhs) && isWriteOrExclusive(rhs)));
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}
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/// @brief get the transaction type from a string
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static Type fromString(char const* value) {
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if (strcmp(value, "read") == 0) {
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return Type::READ;
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}
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if (strcmp(value, "write") == 0) {
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return Type::WRITE;
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}
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if (strcmp(value, "exclusive") == 0) {
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return Type::EXCLUSIVE;
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}
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THROW_ARANGO_EXCEPTION_MESSAGE(TRI_ERROR_INTERNAL, "invalid access type");
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}
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/// @brief return the type of the transaction as a string
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static char const* typeString(Type value) {
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switch (value) {
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case Type::NONE:
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return "none";
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case Type::READ:
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return "read";
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case Type::WRITE:
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return "write";
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case Type::EXCLUSIVE:
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return "exclusive";
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}
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THROW_ARANGO_EXCEPTION_MESSAGE(TRI_ERROR_INTERNAL, "invalid access type");
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}
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};
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} // namespace arangodb
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namespace std {
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template <>
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struct hash<arangodb::AccessMode::Type> {
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size_t operator()(arangodb::AccessMode::Type const& value) const noexcept {
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return static_cast<size_t>(value);
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}
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};
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} // namespace std
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#endif
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