/// <summary>
/// Создает менеджера страниц данных.
/// </summary>
public DataPageManager(DataPageManagerConfig config)
{
_config = config;
if (!Directory.Exists(_config.Directory))
{
Directory.CreateDirectory(_config.Directory);
}
Name = config.Name;
_dataPageFileNamingStrategy = new HierarchyFileNamingStrategy(_config.Directory);
_dataPages = new ConcurrentDictionary <int, DataPage>();
_dataRecordIndexStorage = new DataRecordIndexStorage(_config.Directory, new DataRecordIndexStoreConfig(TimeSpan.FromMilliseconds(500)));
LoadMetaData();
var lastRecordIndex = _dataRecordIndexStorage.AsEnumerable().Reverse().FirstOrDefault();
if (lastRecordIndex != default)
{
_currentDataRecordId = lastRecordIndex.DataRecordId;
}
}
private static void Main()
{
var dpmConfig =
new DataPageManagerConfig(
"DataPageManager-1",
100,
Path.Combine(Directory.GetCurrentDirectory())
);
using (var dataPageManager = new DataPageManager(dpmConfig))
{
var dog = new Dog
{
Age = 5,
Id = 10420,
Name = "A dog"
};
var anotherDog = new Dog
{
Age = 4,
Id = 10421,
Name = "Another dog"
};
var anotherOneDog = new Dog
{
Age = 1,
Id = 10422,
Name = "Another one dog 3"
};
dataPageManager.Save(DataRecord.Create(dog.GetBytes()));
dataPageManager.Save(DataRecord.Create(anotherDog.GetBytes()));
dataPageManager.Save(DataRecord.Create(anotherOneDog.GetBytes()));
Thread.Sleep(1000); // даём время на срабатывание автосохранения.
var dataRecord1 = dataPageManager.Read(1);
var dataRecord2 = dataPageManager.Read(2);
var dataRecord3 = dataPageManager.Read(3);
if (dataRecord1?.Body != null)
{
Debug.Assert(dog.GetBytes().SequenceEqual(dataRecord1.Body));
var animal = Dog.ReadFrom(dataRecord1.Body);
}
if (dataRecord2?.Body != null)
{
Debug.Assert(anotherDog.GetBytes().SequenceEqual(dataRecord2.Body));
var animal = Dog.ReadFrom(dataRecord2.Body);
}
if (dataRecord3?.Body != null)
{
Debug.Assert(anotherOneDog.GetBytes().SequenceEqual(dataRecord3.Body));
var animal = Dog.ReadFrom(dataRecord3.Body);
}
foreach (var record in dataPageManager.AsEnumerable(1))
{
var animal = Dog.ReadFrom(record.Body);
}
}
Console.ReadLine();
}