text: // 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
  
  #ifndef __MESOS_STATE_IN_MEMORY_HPP__
  #define __MESOS_STATE_IN_MEMORY_HPP__
  
  #include <set>
  #include <string>
  
  #include <mesos/state/storage.hpp>
  
  #include <process/future.hpp>
  
  #include <stout/option.hpp>
  #include <stout/uuid.hpp>
  
  namespace mesos {
  namespace state {
  
  // Forward declaration.
  class InMemoryStorageProcess;
  
  
  class InMemoryStorage : public mesos::state::Storage
  {
  public:
    InMemoryStorage();
    ~InMemoryStorage() override;
  
    // Storage implementation.
    process::Future<Option<internal::state::Entry>> get(
        const std::string& name) override;
    process::Future<bool> set(
        const internal::state::Entry& entry,
        const id::UUID& uuid) override;
    process::Future<bool> expunge(const internal::state::Entry& entry) override;
    process::Future<std::set<std::string>> names() override;
  
  private:
    InMemoryStorageProcess* process;
  };
  
  } // namespace state {
  } // namespace mesos {
  
  #endif // __MESOS_STATE_IN_MEMORY_HPP__
  