text: /*
   * ServerKnobCollection.cpp
   *
   * This source file is part of the FoundationDB open source project
   *
   * Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
   *
   * 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.
   */
  
  #include "fdbclient/ServerKnobCollection.h"
  
  ServerKnobCollection::ServerKnobCollection(Randomize randomize, IsSimulated isSimulated)
    : clientKnobCollection(randomize, isSimulated),
      serverKnobs(randomize, &clientKnobCollection.getMutableClientKnobs(), isSimulated) {}
  
  void ServerKnobCollection::initialize(Randomize randomize, IsSimulated isSimulated) {
  	clientKnobCollection.initialize(randomize, isSimulated);
  	serverKnobs.initialize(randomize, &clientKnobCollection.getMutableClientKnobs(), isSimulated);
  }
  
  void ServerKnobCollection::reset(Randomize randomize, IsSimulated isSimulated) {
  	clientKnobCollection.reset(randomize, isSimulated);
  	serverKnobs.reset(randomize, &clientKnobCollection.getMutableClientKnobs(), isSimulated);
  }
  
  Optional<KnobValue> ServerKnobCollection::tryParseKnobValue(std::string const& knobName,
                                                              std::string const& knobValue) const {
  	auto result = clientKnobCollection.tryParseKnobValue(knobName, knobValue);
  	if (result.present()) {
  		return result;
  	}
  	auto parsedKnobValue = serverKnobs.parseKnobValue(knobName, knobValue);
  	if (!std::holds_alternative<NoKnobFound>(parsedKnobValue)) {
  		return KnobValueRef::create(parsedKnobValue);
  	}
  	return {};
  }
  
  bool ServerKnobCollection::trySetKnob(std::string const& knobName, KnobValueRef const& knobValue) {
  	return clientKnobCollection.trySetKnob(knobName, knobValue) || knobValue.visitSetKnob(knobName, serverKnobs);
  }
  