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removed sql delayed writer in favor of prepared statements

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This commit is contained in:
Luke Pulverenti
2013-05-21 11:52:59 -04:00
parent 8682ee30dd
commit e01202030d
7 changed files with 166 additions and 227 deletions
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169
MediaBrowser.Server.Implementations/Sqlite/SQLiteItemRepository.cs
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@@ -8,6 +8,7 @@ using MediaBrowser.Server.Implementations.Reflection;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SQLite;
using System.IO;
using System.Linq;
using System.Threading;
@@ -53,6 +54,19 @@ namespace MediaBrowser.Server.Implementations.Sqlite
/// </summary>
private readonly IApplicationPaths _appPaths;
/// <summary>
/// The _save item command
/// </summary>
private SQLiteCommand _saveItemCommand;
/// <summary>
/// The _delete children command
/// </summary>
private SQLiteCommand _deleteChildrenCommand;
/// <summary>
/// The _save children command
/// </summary>
private SQLiteCommand _saveChildrenCommand;
/// <summary>
/// Initializes a new instance of the <see cref="SQLiteUserDataRepository" /> class.
/// </summary>
@@ -100,6 +114,8 @@ namespace MediaBrowser.Server.Implementations.Sqlite
};
RunQueries(queries);
PrepareStatements();
}
//cascade delete triggers
@@ -116,6 +132,39 @@ namespace MediaBrowser.Server.Implementations.Sqlite
DELETE FROM children WHERE children.child = old.child;
END";
/// <summary>
/// The _write lock
/// </summary>
private readonly SemaphoreSlim _writeLock = new SemaphoreSlim(1,1);
/// <summary>
/// Prepares the statements.
/// </summary>
private void PrepareStatements()
{
_saveItemCommand = new SQLiteCommand
{
CommandText = "replace into items (guid, obj_type, data) values (@1, @2, @3)"
};
_saveItemCommand.Parameters.Add(new SQLiteParameter("@1"));
_saveItemCommand.Parameters.Add(new SQLiteParameter("@2"));
_saveItemCommand.Parameters.Add(new SQLiteParameter("@3"));
_deleteChildrenCommand = new SQLiteCommand
{
CommandText = "delete from children where guid = @guid"
};
_deleteChildrenCommand.Parameters.Add(new SQLiteParameter("@guid"));
_saveChildrenCommand = new SQLiteCommand
{
CommandText = "replace into children (guid, child) values (@guid, @child)"
};
_saveChildrenCommand.Parameters.Add(new SQLiteParameter("@guid"));
_saveChildrenCommand.Parameters.Add(new SQLiteParameter("@child"));
}
/// <summary>
/// Save a standard item in the repo
/// </summary>
@@ -123,7 +172,7 @@ namespace MediaBrowser.Server.Implementations.Sqlite
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task.</returns>
/// <exception cref="System.ArgumentNullException">item</exception>
public Task SaveItem(BaseItem item, CancellationToken cancellationToken)
public async Task SaveItem(BaseItem item, CancellationToken cancellationToken)
{
if (item == null)
{
@@ -137,19 +186,51 @@ namespace MediaBrowser.Server.Implementations.Sqlite
cancellationToken.ThrowIfCancellationRequested();
return Task.Run(() =>
var serialized = _jsonSerializer.SerializeToBytes(item);
await _writeLock.WaitAsync(cancellationToken).ConfigureAwait(false);
SQLiteTransaction transaction = null;
try
{
var serialized = _jsonSerializer.SerializeToBytes(item);
transaction = Connection.BeginTransaction();
cancellationToken.ThrowIfCancellationRequested();
_saveItemCommand.Parameters[0].Value = item.Id;
_saveItemCommand.Parameters[1].Value = item.GetType().FullName;
_saveItemCommand.Parameters[2].Value = serialized;
var cmd = connection.CreateCommand();
cmd.CommandText = "replace into items (guid, obj_type, data) values (@1, @2, @3)";
cmd.AddParam("@1", item.Id);
cmd.AddParam("@2", item.GetType().FullName);
cmd.AddParam("@3", serialized);
QueueCommand(cmd);
});
_saveItemCommand.Transaction = transaction;
await _saveItemCommand.ExecuteNonQueryAsync(cancellationToken);
transaction.Commit();
}
catch (OperationCanceledException)
{
if (transaction != null)
{
transaction.Rollback();
}
}
catch (Exception e)
{
Logger.ErrorException("Failed to save item:", e);
if (transaction != null)
{
transaction.Rollback();
}
}
finally
{
if (transaction != null)
{
transaction.Dispose();
}
_writeLock.Release();
}
}
/// <summary>
@@ -157,6 +238,7 @@ namespace MediaBrowser.Server.Implementations.Sqlite
/// </summary>
/// <param name="id">The id.</param>
/// <returns>BaseItem.</returns>
/// <exception cref="System.ArgumentNullException">id</exception>
/// <exception cref="System.ArgumentException"></exception>
public BaseItem GetItem(Guid id)
{
@@ -189,6 +271,7 @@ namespace MediaBrowser.Server.Implementations.Sqlite
/// </summary>
/// <param name="id">The id.</param>
/// <returns>BaseItem.</returns>
/// <exception cref="System.ArgumentNullException">id</exception>
/// <exception cref="System.ArgumentException"></exception>
protected BaseItem RetrieveItemInternal(Guid id)
{
@@ -197,7 +280,7 @@ namespace MediaBrowser.Server.Implementations.Sqlite
throw new ArgumentNullException("id");
}
using (var cmd = connection.CreateCommand())
using (var cmd = Connection.CreateCommand())
{
cmd.CommandText = "select obj_type,data from items where guid = @guid";
var guidParam = cmd.Parameters.Add("@guid", DbType.Guid);
@@ -240,7 +323,7 @@ namespace MediaBrowser.Server.Implementations.Sqlite
throw new ArgumentNullException();
}
using (var cmd = connection.CreateCommand())
using (var cmd = Connection.CreateCommand())
{
cmd.CommandText = "select obj_type,data from items where guid in (select child from children where guid = @guid)";
var guidParam = cmd.Parameters.Add("@guid", DbType.Guid);
@@ -281,7 +364,7 @@ namespace MediaBrowser.Server.Implementations.Sqlite
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task.</returns>
/// <exception cref="System.ArgumentNullException">id</exception>
public Task SaveChildren(Guid id, IEnumerable<BaseItem> children, CancellationToken cancellationToken)
public async Task SaveChildren(Guid id, IEnumerable<BaseItem> children, CancellationToken cancellationToken)
{
if (id == Guid.Empty)
{
@@ -300,27 +383,57 @@ namespace MediaBrowser.Server.Implementations.Sqlite
cancellationToken.ThrowIfCancellationRequested();
return Task.Run(() =>
await _writeLock.WaitAsync(cancellationToken).ConfigureAwait(false);
SQLiteTransaction transaction = null;
try
{
var cmd = connection.CreateCommand();
transaction = Connection.BeginTransaction();
cmd.CommandText = "delete from children where guid = @guid";
cmd.AddParam("@guid", id);
QueueCommand(cmd);
// Delete exising children
_deleteChildrenCommand.Parameters[0].Value = id;
_deleteChildrenCommand.Transaction = transaction;
await _deleteChildrenCommand.ExecuteNonQueryAsync(cancellationToken);
// Save new children
foreach (var child in children)
{
var guid = child.Id;
cmd = connection.CreateCommand();
cmd.AddParam("@guid", id);
cmd.CommandText = "replace into children (guid, child) values (@guid, @child)";
var childParam = cmd.Parameters.Add("@child", DbType.Guid);
_saveChildrenCommand.Transaction = transaction;
_saveChildrenCommand.Parameters[0].Value = id;
_saveChildrenCommand.Parameters[1].Value = child.Id;
childParam.Value = guid;
QueueCommand(cmd);
await _saveChildrenCommand.ExecuteNonQueryAsync(cancellationToken);
}
});
transaction.Commit();
}
catch (OperationCanceledException)
{
if (transaction != null)
{
transaction.Rollback();
}
}
catch (Exception e)
{
Logger.ErrorException("Failed to save item:", e);
if (transaction != null)
{
transaction.Rollback();
}
}
finally
{
if (transaction != null)
{
transaction.Dispose();
}
_writeLock.Release();
}
}
/// <summary>