mirror of https://gitee.com/bigwinds/arangodb
85 lines
2.8 KiB
C++
85 lines
2.8 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2016 ArangoDB 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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#include "EngineSelectorFeature.h"
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#include "ApplicationFeatures/ApplicationServer.h"
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#include "ProgramOptions/ProgramOptions.h"
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#include "ProgramOptions/Section.h"
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#include "StorageEngine/MMFilesEngine.h"
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#include "StorageEngine/RocksDBEngine.h"
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#include "StorageEngine/StorageEngine.h"
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using namespace arangodb;
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using namespace arangodb::options;
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StorageEngine* EngineSelectorFeature::ENGINE = nullptr;
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EngineSelectorFeature::EngineSelectorFeature(
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application_features::ApplicationServer* server)
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: ApplicationFeature(server, "EngineSelector"), _engine(MMFilesEngine::EngineName) {
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setOptional(false);
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requiresElevatedPrivileges(false);
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startsAfter("Logger");
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}
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void EngineSelectorFeature::collectOptions(std::shared_ptr<ProgramOptions> options) {
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options->addSection("server", "Server features");
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options->addHiddenOption("--server.storage-engine",
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"storage engine type",
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new DiscreteValuesParameter<StringParameter>(&_engine, availableEngines()));
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}
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void EngineSelectorFeature::prepare() {
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// deactivate all engines but the selected one
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for (auto& engine : availableEngines()) {
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StorageEngine* e = application_features::ApplicationServer::getFeature<StorageEngine>(engine);
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if (engine == _engine) {
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// this is the selected engine
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LOG_TOPIC(TRACE, Logger::STARTUP) << "using storage engine " << engine;
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e->enable();
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// register storage engine
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ENGINE = e;
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} else {
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// turn off all other storage engines
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LOG_TOPIC(TRACE, Logger::STARTUP) << "disabling storage engine " << engine;
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e->disable();
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}
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}
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TRI_ASSERT(ENGINE != nullptr);
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}
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void EngineSelectorFeature::unprepare() {
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// unregister storage engine
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ENGINE = nullptr;
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}
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// return all available storage engines
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std::unordered_set<std::string> EngineSelectorFeature::availableEngines() {
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return std::unordered_set<std::string>{
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MMFilesEngine::EngineName, RocksDBEngine::EngineName
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};
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}
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