270 lines
7.3 KiB
C#
270 lines
7.3 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Threading;
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using System.Threading.Tasks;
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using MediaBrowser.Model.Logging;
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using SQLitePCL.pretty;
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using System.Linq;
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using SQLitePCL;
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namespace Emby.Server.Implementations.Data
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{
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public abstract class BaseSqliteRepository : IDisposable
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{
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protected string DbFilePath { get; set; }
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protected ReaderWriterLockSlim WriteLock;
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protected ILogger Logger { get; private set; }
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protected BaseSqliteRepository(ILogger logger)
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{
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Logger = logger;
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WriteLock = AllowLockRecursion ?
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new ReaderWriterLockSlim(LockRecursionPolicy.SupportsRecursion) :
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new ReaderWriterLockSlim(LockRecursionPolicy.NoRecursion);
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}
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protected virtual bool AllowLockRecursion
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{
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get { return false; }
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}
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protected virtual bool EnableConnectionPooling
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{
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get { return true; }
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}
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static BaseSqliteRepository()
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{
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SQLite3.EnableSharedCache = false;
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int rc = raw.sqlite3_config(raw.SQLITE_CONFIG_MEMSTATUS, 0);
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//CheckOk(rc);
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}
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private static bool _versionLogged;
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protected virtual SQLiteDatabaseConnection CreateConnection(bool isReadOnly = false)
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{
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if (!_versionLogged)
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{
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_versionLogged = true;
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Logger.Info("Sqlite version: " + SQLite3.Version);
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Logger.Info("Sqlite compiler options: " + string.Join(",", SQLite3.CompilerOptions.ToArray()));
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}
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ConnectionFlags connectionFlags;
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//isReadOnly = false;
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if (isReadOnly)
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{
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connectionFlags = ConnectionFlags.ReadOnly;
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//connectionFlags = ConnectionFlags.Create;
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//connectionFlags |= ConnectionFlags.ReadWrite;
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}
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else
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{
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connectionFlags = ConnectionFlags.Create;
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connectionFlags |= ConnectionFlags.ReadWrite;
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}
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if (EnableConnectionPooling)
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{
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connectionFlags |= ConnectionFlags.SharedCached;
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}
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else
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{
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connectionFlags |= ConnectionFlags.PrivateCache;
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}
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connectionFlags |= ConnectionFlags.NoMutex;
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var db = SQLite3.Open(DbFilePath, connectionFlags, null);
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var queries = new List<string>
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{
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"pragma default_temp_store = memory",
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"PRAGMA page_size=4096",
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"PRAGMA journal_mode=WAL",
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"PRAGMA temp_store=memory",
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"PRAGMA synchronous=Normal",
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//"PRAGMA cache size=-10000"
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};
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var cacheSize = CacheSize;
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if (cacheSize.HasValue)
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{
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}
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if (EnableExclusiveMode)
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{
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queries.Add("PRAGMA locking_mode=EXCLUSIVE");
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}
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//foreach (var query in queries)
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//{
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// db.Execute(query);
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//}
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db.ExecuteAll(string.Join(";", queries.ToArray()));
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return db;
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}
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protected virtual int? CacheSize
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{
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get
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{
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return null;
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}
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}
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protected virtual bool EnableExclusiveMode
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{
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get { return false; }
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}
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internal static void CheckOk(int rc)
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{
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string msg = "";
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if (raw.SQLITE_OK != rc)
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{
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throw CreateException((ErrorCode)rc, msg);
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}
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}
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internal static Exception CreateException(ErrorCode rc, string msg)
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{
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var exp = new Exception(msg);
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return exp;
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}
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private bool _disposed;
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protected void CheckDisposed()
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{
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if (_disposed)
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{
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throw new ObjectDisposedException(GetType().Name + " has been disposed and cannot be accessed.");
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}
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}
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public void Dispose()
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{
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_disposed = true;
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Dispose(true);
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GC.SuppressFinalize(this);
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}
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private readonly object _disposeLock = new object();
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/// <summary>
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/// Releases unmanaged and - optionally - managed resources.
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/// </summary>
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/// <param name="dispose"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
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protected virtual void Dispose(bool dispose)
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{
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if (dispose)
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{
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try
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{
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lock (_disposeLock)
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{
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using (WriteLock.Write())
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{
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CloseConnection();
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}
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}
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}
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catch (Exception ex)
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{
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Logger.ErrorException("Error disposing database", ex);
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}
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}
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}
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protected virtual void CloseConnection()
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{
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}
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protected List<string> GetColumnNames(IDatabaseConnection connection, string table)
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{
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var list = new List<string>();
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foreach (var row in connection.Query("PRAGMA table_info(" + table + ")"))
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{
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if (row[1].SQLiteType != SQLiteType.Null)
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{
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var name = row[1].ToString();
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list.Add(name);
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}
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}
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return list;
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}
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protected void AddColumn(IDatabaseConnection connection, string table, string columnName, string type, List<string> existingColumnNames)
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{
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if (existingColumnNames.Contains(columnName, StringComparer.OrdinalIgnoreCase))
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{
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return;
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}
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connection.Execute("alter table " + table + " add column " + columnName + " " + type + " NULL");
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}
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}
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public static class ReaderWriterLockSlimExtensions
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{
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private sealed class ReadLockToken : IDisposable
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{
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private ReaderWriterLockSlim _sync;
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public ReadLockToken(ReaderWriterLockSlim sync)
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{
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_sync = sync;
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sync.EnterReadLock();
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}
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public void Dispose()
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{
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if (_sync != null)
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{
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_sync.ExitReadLock();
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_sync = null;
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}
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}
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}
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private sealed class WriteLockToken : IDisposable
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{
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private ReaderWriterLockSlim _sync;
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public WriteLockToken(ReaderWriterLockSlim sync)
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{
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_sync = sync;
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sync.EnterWriteLock();
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}
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public void Dispose()
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{
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if (_sync != null)
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{
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_sync.ExitWriteLock();
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_sync = null;
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}
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}
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}
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public static IDisposable Read(this ReaderWriterLockSlim obj)
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{
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return new ReadLockToken(obj);
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}
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public static IDisposable Write(this ReaderWriterLockSlim obj)
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{
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return new WriteLockToken(obj);
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}
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}
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}
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