using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Logging;
using System;
using System.Collections.Generic;
using System.Data;
using System.Threading;
using System.Threading.Tasks;
namespace MediaBrowser.Server.Implementations.Persistence
{
public class SqliteChapterRepository
{
private IDbConnection _connection;
private readonly ILogger _logger;
private IDbCommand _deleteChaptersCommand;
private IDbCommand _saveChapterCommand;
///
/// Initializes a new instance of the class.
///
/// The connection.
/// The log manager.
/// appPaths
/// or
/// jsonSerializer
public SqliteChapterRepository(IDbConnection connection, ILogManager logManager)
{
_connection = connection;
_logger = logManager.GetLogger(GetType().Name);
}
private SqliteShrinkMemoryTimer _shrinkMemoryTimer;
///
/// Opens the connection to the database
///
/// Task.
public void Initialize()
{
string[] queries = {
"create table if not exists chapters (ItemId GUID, ChapterIndex INT, StartPositionTicks BIGINT, Name TEXT, ImagePath TEXT, PRIMARY KEY (ItemId, ChapterIndex))",
"create index if not exists idx_chapters on chapters(ItemId, ChapterIndex)",
//pragmas
"pragma temp_store = memory",
"pragma shrink_memory"
};
_connection.RunQueries(queries, _logger);
PrepareStatements();
_shrinkMemoryTimer = new SqliteShrinkMemoryTimer(_connection, _writeLock, _logger);
}
///
/// The _write lock
///
private readonly SemaphoreSlim _writeLock = new SemaphoreSlim(1, 1);
///
/// Prepares the statements.
///
private void PrepareStatements()
{
_deleteChaptersCommand = _connection.CreateCommand();
_deleteChaptersCommand.CommandText = "delete from chapters where ItemId=@ItemId";
_deleteChaptersCommand.Parameters.Add(_deleteChaptersCommand, "@ItemId");
_saveChapterCommand = _connection.CreateCommand();
_saveChapterCommand.CommandText = "replace into chapters (ItemId, ChapterIndex, StartPositionTicks, Name, ImagePath) values (@ItemId, @ChapterIndex, @StartPositionTicks, @Name, @ImagePath)";
_saveChapterCommand.Parameters.Add(_saveChapterCommand, "@ItemId");
_saveChapterCommand.Parameters.Add(_saveChapterCommand, "@ChapterIndex");
_saveChapterCommand.Parameters.Add(_saveChapterCommand, "@StartPositionTicks");
_saveChapterCommand.Parameters.Add(_saveChapterCommand, "@Name");
_saveChapterCommand.Parameters.Add(_saveChapterCommand, "@ImagePath");
}
///
/// Gets chapters for an item
///
/// The id.
/// IEnumerable{ChapterInfo}.
/// id
public IEnumerable GetChapters(Guid id)
{
if (id == Guid.Empty)
{
throw new ArgumentNullException("id");
}
using (var cmd = _connection.CreateCommand())
{
cmd.CommandText = "select StartPositionTicks,Name,ImagePath from Chapters where ItemId = @ItemId order by ChapterIndex asc";
cmd.Parameters.Add(cmd, "@ItemId", DbType.Guid).Value = id;
using (var reader = cmd.ExecuteReader(CommandBehavior.SequentialAccess | CommandBehavior.SingleResult))
{
while (reader.Read())
{
yield return GetChapter(reader);
}
}
}
}
///
/// Gets a single chapter for an item
///
/// The id.
/// The index.
/// ChapterInfo.
/// id
public ChapterInfo GetChapter(Guid id, int index)
{
if (id == Guid.Empty)
{
throw new ArgumentNullException("id");
}
using (var cmd = _connection.CreateCommand())
{
cmd.CommandText = "select StartPositionTicks,Name,ImagePath from Chapters where ItemId = @ItemId and ChapterIndex=@ChapterIndex";
cmd.Parameters.Add(cmd, "@ItemId", DbType.Guid).Value = id;
cmd.Parameters.Add(cmd, "@ChapterIndex", DbType.Int32).Value = index;
using (var reader = cmd.ExecuteReader(CommandBehavior.SequentialAccess | CommandBehavior.SingleResult | CommandBehavior.SingleRow))
{
if (reader.Read())
{
return GetChapter(reader);
}
}
return null;
}
}
///
/// Gets the chapter.
///
/// The reader.
/// ChapterInfo.
private ChapterInfo GetChapter(IDataReader reader)
{
var chapter = new ChapterInfo
{
StartPositionTicks = reader.GetInt64(0)
};
if (!reader.IsDBNull(1))
{
chapter.Name = reader.GetString(1);
}
if (!reader.IsDBNull(2))
{
chapter.ImagePath = reader.GetString(2);
}
return chapter;
}
///
/// Saves the chapters.
///
/// The id.
/// The chapters.
/// The cancellation token.
/// Task.
///
/// id
/// or
/// chapters
/// or
/// cancellationToken
///
public async Task SaveChapters(Guid id, IEnumerable chapters, CancellationToken cancellationToken)
{
if (id == Guid.Empty)
{
throw new ArgumentNullException("id");
}
if (chapters == null)
{
throw new ArgumentNullException("chapters");
}
cancellationToken.ThrowIfCancellationRequested();
await _writeLock.WaitAsync(cancellationToken).ConfigureAwait(false);
IDbTransaction transaction = null;
try
{
transaction = _connection.BeginTransaction();
// First delete chapters
_deleteChaptersCommand.GetParameter(0).Value = id;
_deleteChaptersCommand.Transaction = transaction;
_deleteChaptersCommand.ExecuteNonQuery();
var index = 0;
foreach (var chapter in chapters)
{
cancellationToken.ThrowIfCancellationRequested();
_saveChapterCommand.GetParameter(0).Value = id;
_saveChapterCommand.GetParameter(1).Value = index;
_saveChapterCommand.GetParameter(2).Value = chapter.StartPositionTicks;
_saveChapterCommand.GetParameter(3).Value = chapter.Name;
_saveChapterCommand.GetParameter(4).Value = chapter.ImagePath;
_saveChapterCommand.Transaction = transaction;
_saveChapterCommand.ExecuteNonQuery();
index++;
}
transaction.Commit();
}
catch (OperationCanceledException)
{
if (transaction != null)
{
transaction.Rollback();
}
throw;
}
catch (Exception e)
{
_logger.ErrorException("Failed to save chapters:", e);
if (transaction != null)
{
transaction.Rollback();
}
throw;
}
finally
{
if (transaction != null)
{
transaction.Dispose();
}
_writeLock.Release();
}
}
///
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
///
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
private readonly object _disposeLock = new object();
///
/// Releases unmanaged and - optionally - managed resources.
///
/// true to release both managed and unmanaged resources; false to release only unmanaged resources.
protected virtual void Dispose(bool dispose)
{
if (dispose)
{
try
{
lock (_disposeLock)
{
if (_shrinkMemoryTimer != null)
{
_shrinkMemoryTimer.Dispose();
_shrinkMemoryTimer = null;
}
if (_connection != null)
{
if (_connection.IsOpen())
{
_connection.Close();
}
_connection.Dispose();
_connection = null;
}
}
}
catch (Exception ex)
{
_logger.ErrorException("Error disposing database", ex);
}
}
}
}
}