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using MediaBrowser.Controller;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Persistence;
using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.Data;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
namespace MediaBrowser.Server.Sqlite
{
/// <summary>
/// Class SQLiteUserDataRepository
/// </summary>
[Export(typeof(IUserDataRepository))]
public class SQLiteUserDataRepository : SqliteRepository, IUserDataRepository
{
/// <summary>
/// The repository name
/// </summary>
public const string RepositoryName = "SQLite";
/// <summary>
/// Gets the name of the repository
/// </summary>
/// <value>The name.</value>
public string Name
{
get
{
return RepositoryName;
}
}
/// <summary>
/// Opens the connection to the database
/// </summary>
/// <returns>Task.</returns>
public async Task Initialize()
{
var dbFile = Path.Combine(Kernel.Instance.ApplicationPaths.DataPath, "userdata.db");
await ConnectToDB(dbFile).ConfigureAwait(false);
string[] queries = {
"create table if not exists user_data (item_id GUID, user_id GUID, data BLOB)",
"create unique index if not exists idx_user_data on user_data (item_id, user_id)",
"create table if not exists schema_version (table_name primary key, version)",
//pragmas
"pragma temp_store = memory"
};
RunQueries(queries);
}
/// <summary>
/// Save the user specific data associated with an item in the repo
/// </summary>
/// <param name="item">The item.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task.</returns>
/// <exception cref="System.ArgumentNullException">item</exception>
public Task SaveUserData(BaseItem item, CancellationToken cancellationToken)
{
if (item == null)
{
throw new ArgumentNullException("item");
}
if (cancellationToken == null)
{
throw new ArgumentNullException("cancellationToken");
}
return Task.Run(() =>
{
cancellationToken.ThrowIfCancellationRequested();
var cmd = connection.CreateCommand();
cmd.CommandText = "delete from user_data where item_id = @guid";
cmd.AddParam("@guid", item.UserDataId);
QueueCommand(cmd);
if (item.UserData != null)
{
foreach (var data in item.UserData)
{
cmd = connection.CreateCommand();
cmd.CommandText = "insert into user_data (item_id, user_id, data) values (@1, @2, @3)";
cmd.AddParam("@1", item.UserDataId);
cmd.AddParam("@2", data.UserId);
cmd.AddParam("@3", Kernel.Instance.ProtobufSerializer.SerializeToBytes(data));
QueueCommand(cmd);
}
}
});
}
/// <summary>
/// Gets user data for an item
/// </summary>
/// <param name="item">The item.</param>
/// <returns>IEnumerable{UserItemData}.</returns>
/// <exception cref="System.ArgumentNullException"></exception>
public IEnumerable<UserItemData> RetrieveUserData(BaseItem item)
{
if (item == null)
{
throw new ArgumentNullException("item");
}
var cmd = connection.CreateCommand();
cmd.CommandText = "select data from user_data where item_id = @guid";
var guidParam = cmd.Parameters.Add("@guid", DbType.Guid);
guidParam.Value = item.UserDataId;
using (var reader = cmd.ExecuteReader(CommandBehavior.SequentialAccess | CommandBehavior.SingleResult))
{
while (reader.Read())
{
using (var stream = GetStream(reader, 0))
{
var data = Kernel.Instance.ProtobufSerializer.DeserializeFromStream<UserItemData>(stream);
if (data != null)
{
yield return data;
}
}
}
}
}
}
}
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