| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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 "master/detector/standalone.hpp" |
| |
| #include <set> |
| |
| #include <mesos/master/detector.hpp> |
| |
| #include <process/defer.hpp> |
| #include <process/dispatch.hpp> |
| #include <process/future.hpp> |
| #include <process/id.hpp> |
| #include <process/process.hpp> |
| |
| #include "common/protobuf_utils.hpp" |
| |
| using namespace process; |
| |
| using std::set; |
| |
| namespace mesos { |
| namespace master { |
| namespace detector { |
| |
| class StandaloneMasterDetectorProcess |
| : public Process<StandaloneMasterDetectorProcess> |
| { |
| public: |
| StandaloneMasterDetectorProcess() |
| : ProcessBase(ID::generate("standalone-master-detector")) {} |
| explicit StandaloneMasterDetectorProcess(const MasterInfo& _leader) |
| : ProcessBase(ID::generate("standalone-master-detector")), |
| leader(_leader) {} |
| |
| ~StandaloneMasterDetectorProcess() override |
| { |
| discardPromises(&promises); |
| } |
| |
| void appoint(const Option<MasterInfo>& leader_) |
| { |
| leader = leader_; |
| |
| setPromises(&promises, leader); |
| } |
| |
| Future<Option<MasterInfo>> detect( |
| const Option<MasterInfo>& previous = None()) |
| { |
| if (leader != previous) { |
| return leader; |
| } |
| |
| Promise<Option<MasterInfo>>* promise = new Promise<Option<MasterInfo>>(); |
| |
| promise->future() |
| .onDiscard(defer(self(), &Self::discard, promise->future())); |
| |
| promises.insert(promise); |
| return promise->future(); |
| } |
| |
| private: |
| void discard(const Future<Option<MasterInfo>>& future) |
| { |
| // Discard the promise holding this future. |
| discardPromises(&promises, future); |
| } |
| |
| Option<MasterInfo> leader; // The appointed master. |
| set<Promise<Option<MasterInfo>>*> promises; |
| }; |
| |
| |
| StandaloneMasterDetector::StandaloneMasterDetector() |
| { |
| process = new StandaloneMasterDetectorProcess(); |
| spawn(process); |
| } |
| |
| |
| StandaloneMasterDetector::StandaloneMasterDetector(const MasterInfo& leader) |
| { |
| process = new StandaloneMasterDetectorProcess(leader); |
| spawn(process); |
| } |
| |
| |
| StandaloneMasterDetector::StandaloneMasterDetector(const UPID& leader) |
| { |
| process = new StandaloneMasterDetectorProcess( |
| mesos::internal::protobuf::createMasterInfo(leader)); |
| |
| spawn(process); |
| } |
| |
| |
| StandaloneMasterDetector::~StandaloneMasterDetector() |
| { |
| terminate(process); |
| process::wait(process); |
| delete process; |
| } |
| |
| |
| void StandaloneMasterDetector::appoint(const Option<MasterInfo>& leader) |
| { |
| dispatch(process, &StandaloneMasterDetectorProcess::appoint, leader); |
| } |
| |
| |
| void StandaloneMasterDetector::appoint(const UPID& leader) |
| { |
| dispatch(process, |
| &StandaloneMasterDetectorProcess::appoint, |
| mesos::internal::protobuf::createMasterInfo(leader)); |
| } |
| |
| |
| Future<Option<MasterInfo>> StandaloneMasterDetector::detect( |
| const Option<MasterInfo>& previous) |
| { |
| return dispatch(process, &StandaloneMasterDetectorProcess::detect, previous); |
| } |
| |
| } // namespace detector { |
| } // namespace master { |
| } // namespace mesos { |