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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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165
MediaBrowser.Server.Implementations/Sqlite/SQLiteRepository.cs
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@@ -18,24 +18,11 @@ namespace MediaBrowser.Server.Implementations.Sqlite
/// <summary>
/// The db file name
/// </summary>
protected string dbFileName;
protected string DbFileName;
/// <summary>
/// The connection
/// </summary>
protected SQLiteConnection connection;
/// <summary>
/// The delayed commands
/// </summary>
protected ConcurrentQueue<SQLiteCommand> delayedCommands = new ConcurrentQueue<SQLiteCommand>();
/// <summary>
/// The flush interval
/// </summary>
private const int FlushInterval = 2000;
/// <summary>
/// The flush timer
/// </summary>
private Timer FlushTimer;
protected SQLiteConnection Connection;
/// <summary>
/// Gets the logger.
@@ -43,18 +30,6 @@ namespace MediaBrowser.Server.Implementations.Sqlite
/// <value>The logger.</value>
protected ILogger Logger { get; private set; }
/// <summary>
/// Gets a value indicating whether [enable delayed commands].
/// </summary>
/// <value><c>true</c> if [enable delayed commands]; otherwise, <c>false</c>.</value>
protected virtual bool EnableDelayedCommands
{
get
{
return true;
}
}
/// <summary>
/// Initializes a new instance of the <see cref="SqliteRepository" /> class.
/// </summary>
@@ -83,7 +58,7 @@ namespace MediaBrowser.Server.Implementations.Sqlite
throw new ArgumentNullException("dbPath");
}
dbFileName = dbPath;
DbFileName = dbPath;
var connectionstr = new SQLiteConnectionStringBuilder
{
PageSize = 4096,
@@ -93,15 +68,9 @@ namespace MediaBrowser.Server.Implementations.Sqlite
JournalMode = SQLiteJournalModeEnum.Memory
};
connection = new SQLiteConnection(connectionstr.ConnectionString);
Connection = new SQLiteConnection(connectionstr.ConnectionString);
await connection.OpenAsync().ConfigureAwait(false);
if (EnableDelayedCommands)
{
// Run once
FlushTimer = new Timer(Flush, null, TimeSpan.FromMilliseconds(FlushInterval), TimeSpan.FromMilliseconds(-1));
}
await Connection.OpenAsync().ConfigureAwait(false);
}
/// <summary>
@@ -117,11 +86,11 @@ namespace MediaBrowser.Server.Implementations.Sqlite
throw new ArgumentNullException("queries");
}
using (var tran = connection.BeginTransaction())
using (var tran = Connection.BeginTransaction())
{
try
{
using (var cmd = connection.CreateCommand())
using (var cmd = Connection.CreateCommand())
{
foreach (var query in queries)
{
@@ -165,26 +134,15 @@ namespace MediaBrowser.Server.Implementations.Sqlite
{
lock (_disposeLock)
{
if (connection != null)
if (Connection != null)
{
if (EnableDelayedCommands)
if (Connection.IsOpen())
{
FlushOnDispose();
Connection.Close();
}
if (connection.IsOpen())
{
connection.Close();
}
connection.Dispose();
connection = null;
}
if (FlushTimer != null)
{
FlushTimer.Dispose();
FlushTimer = null;
Connection.Dispose();
Connection = null;
}
}
}
@@ -195,101 +153,6 @@ namespace MediaBrowser.Server.Implementations.Sqlite
}
}
/// <summary>
/// Flushes the on dispose.
/// </summary>
private void FlushOnDispose()
{
// If we're not already flushing, do it now
if (!_isFlushing)
{
Flush(null);
}
// Don't dispose in the middle of a flush
while (_isFlushing)
{
Thread.Sleep(25);
}
}
/// <summary>
/// Queues the command.
/// </summary>
/// <param name="cmd">The CMD.</param>
/// <exception cref="System.ArgumentNullException">cmd</exception>
protected void QueueCommand(SQLiteCommand cmd)
{
if (cmd == null)
{
throw new ArgumentNullException("cmd");
}
delayedCommands.Enqueue(cmd);
}
/// <summary>
/// The is flushing
/// </summary>
private bool _isFlushing;
/// <summary>
/// Flushes the specified sender.
/// </summary>
/// <param name="sender">The sender.</param>
private void Flush(object sender)
{
// Cannot call Count on a ConcurrentQueue since it's an O(n) operation
// Use IsEmpty instead
if (delayedCommands.IsEmpty)
{
FlushTimer.Change(TimeSpan.FromMilliseconds(FlushInterval), TimeSpan.FromMilliseconds(-1));
return;
}
if (_isFlushing)
{
return;
}
_isFlushing = true;
var numCommands = 0;
using (var tran = connection.BeginTransaction())
{
try
{
while (!delayedCommands.IsEmpty)
{
SQLiteCommand command;
delayedCommands.TryDequeue(out command);
command.Connection = connection;
command.Transaction = tran;
command.ExecuteNonQuery();
command.Dispose();
numCommands++;
}
tran.Commit();
}
catch (Exception e)
{
Logger.ErrorException("Failed to commit transaction.", e);
tran.Rollback();
}
}
Logger.Debug("SQL Delayed writer executed " + numCommands + " commands");
FlushTimer.Change(TimeSpan.FromMilliseconds(FlushInterval), TimeSpan.FromMilliseconds(-1));
_isFlushing = false;
}
/// <summary>
/// Executes the command.
/// </summary>
@@ -303,11 +166,11 @@ namespace MediaBrowser.Server.Implementations.Sqlite
throw new ArgumentNullException("cmd");
}
using (var tran = connection.BeginTransaction())
using (var tran = Connection.BeginTransaction())
{
try
{
cmd.Connection = connection;
cmd.Connection = Connection;
cmd.Transaction = tran;
await cmd.ExecuteNonQueryAsync().ConfigureAwait(false);