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.
  
  #pragma once
  
  #include "Types.h"
  
  #include <cstddef>
  #include <vector>
  
  namespace milvus {
  namespace engine {
  
  class IDGenerator {
   public:
      virtual IDNumber
      GetNextIDNumber() = 0;
  
      virtual void
      GetNextIDNumbers(size_t n, IDNumbers& ids) = 0;
  
      virtual ~IDGenerator() = 0;
  };  // IDGenerator
  
  class SimpleIDGenerator : public IDGenerator {
   public:
      ~SimpleIDGenerator() override = default;
  
      IDNumber
      GetNextIDNumber() override;
  
      void
      GetNextIDNumbers(size_t n, IDNumbers& ids) override;
  
   private:
      void
      NextIDNumbers(size_t n, IDNumbers& ids);
  
      static constexpr size_t MAX_IDS_PER_MICRO = 1000;
  };  // SimpleIDGenerator
  
  }  // namespace engine
  }  // namespace milvus
  