text: //---------------------------------------------------------------------------------------------------------------------------------
  // File: OperationManager.h
  // Contents: Queue calls to ODBC on background thread
  // 
  // Copyright Microsoft Corporation and contributors
  //
  // 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.
  //---------------------------------------------------------------------------------------------------------------------------------
  
  #pragma once
  #include <map>
  #include <memory>
  #include <stdafx.h>
  
  namespace mssql {
  
  	using namespace std;
  
  	class Operation;
  
  	/* need to think about threading with multiple active connections */
  
  	class OperationManager
  	{
  		typedef map<size_t, shared_ptr<Operation>> map_operations_t;
  
  	public:
  		OperationManager();
  		~OperationManager();
  		bool add(shared_ptr<Operation> operation_ptr);
  		void check_in_operation(size_t id);
  		shared_ptr<Operation> get_operation(int id)
  		{
  			map_operations_t::const_iterator itr = operations.find(id);
  			return itr->second;
  		}
  
  	private:
  		map_operations_t operations;
  		ssize_t _id;
  		static void on_background(uv_work_t* work);
  		static void on_foreground(uv_work_t* work, int x);
  		mutex g_i_mutex;
  	};
  }
  