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SqliteConnectionFactory.cs
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SqliteConnectionFactory.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
using System.Collections.Generic;
using System.Threading;
namespace Microsoft.Data.Sqlite
{
internal class SqliteConnectionFactory
{
public static readonly SqliteConnectionFactory Instance = new();
private readonly bool _newLockingBehavior;
#pragma warning disable IDE0052 // Remove unread private members
private readonly Timer _pruneTimer;
#pragma warning restore IDE0052 // Remove unread private members
private readonly List<SqliteConnectionPoolGroup> _idlePoolGroups = new();
private readonly List<SqliteConnectionPool> _poolsToRelease = new();
private readonly ReaderWriterLockSlim _lock = new();
private Dictionary<string, SqliteConnectionPoolGroup> _poolGroups = new();
protected SqliteConnectionFactory()
{
_newLockingBehavior = !AppContext.TryGetSwitch("Microsoft.Data.Sqlite.Issue26612", out var enabled) || !enabled;
if (!AppContext.TryGetSwitch("Microsoft.Data.Sqlite.Issue26422", out enabled) || !enabled)
{
AppDomain.CurrentDomain.DomainUnload += (_, _) => ClearPools();
AppDomain.CurrentDomain.ProcessExit += (_, _) => ClearPools();
}
_pruneTimer = new Timer(PruneCallback, null, TimeSpan.FromMinutes(4), TimeSpan.FromSeconds(30));
}
public SqliteConnectionInternal GetConnection(SqliteConnection outerConnection)
{
var poolGroup = outerConnection.PoolGroup;
if (poolGroup.IsDisabled
&& !poolGroup.IsNonPooled)
{
poolGroup = GetPoolGroup(poolGroup.ConnectionString);
outerConnection.PoolGroup = poolGroup;
}
var pool = poolGroup.GetPool();
var connection = pool == null
? new SqliteConnectionInternal(outerConnection.ConnectionOptions)
: pool.GetConnection();
connection.Activate(outerConnection);
return connection;
}
public SqliteConnectionPoolGroup GetPoolGroup(string connectionString)
{
if (_newLockingBehavior)
{
_lock.EnterUpgradeableReadLock();
}
try
{
if (!_poolGroups.TryGetValue(connectionString, out var poolGroup)
|| (poolGroup.IsDisabled
&& !poolGroup.IsNonPooled))
{
var connectionOptions = new SqliteConnectionStringBuilder(connectionString);
if (_newLockingBehavior)
{
_lock.EnterWriteLock();
}
else
{
Monitor.Enter(this);
}
try
{
if (!_poolGroups.TryGetValue(connectionString, out poolGroup))
{
var isNonPooled = connectionOptions.DataSource == ":memory:"
|| connectionOptions.Mode == SqliteOpenMode.Memory
|| connectionOptions.DataSource.Length == 0
|| !connectionOptions.Pooling;
poolGroup = new SqliteConnectionPoolGroup(connectionOptions, connectionString, isNonPooled);
_poolGroups.Add(connectionString, poolGroup);
}
}
finally
{
if (_newLockingBehavior)
{
_lock.ExitWriteLock();
}
else
{
Monitor.Exit(this);
}
}
}
return poolGroup;
}
finally
{
if (_newLockingBehavior)
{
_lock.ExitUpgradeableReadLock();
}
}
}
public void ReleasePool(SqliteConnectionPool pool, bool clearing)
{
pool.Shutdown();
lock (_poolsToRelease)
{
if (clearing)
{
pool.Clear();
}
_poolsToRelease.Add(pool);
}
}
public void ClearPools()
{
if (_newLockingBehavior)
{
_lock.EnterWriteLock();
}
else
{
Monitor.Enter(this);
}
try
{
foreach (var entry in _poolGroups)
{
entry.Value.Clear();
}
}
finally
{
if (_newLockingBehavior)
{
_lock.ExitWriteLock();
}
else
{
Monitor.Exit(this);
}
}
}
private void PruneCallback(object? _)
{
lock (_poolsToRelease)
{
for (var i = _poolsToRelease.Count - 1; i >= 0; i--)
{
var pool = _poolsToRelease[i];
pool.Clear();
if (pool.Count == 0)
{
_poolsToRelease.Remove(pool);
}
}
}
for (var i = _idlePoolGroups.Count - 1; i >= 0; i--)
{
var poolGroup = _idlePoolGroups[i];
if (!poolGroup.Clear())
{
_idlePoolGroups.Remove(poolGroup);
}
}
if (_newLockingBehavior)
{
_lock.EnterWriteLock();
}
else
{
Monitor.Enter(this);
}
try
{
var activePoolGroups = new Dictionary<string, SqliteConnectionPoolGroup>();
foreach (var entry in _poolGroups)
{
var poolGroup = entry.Value;
if (poolGroup.Prune())
{
_idlePoolGroups.Add(poolGroup);
}
else
{
activePoolGroups.Add(entry.Key, poolGroup);
}
}
_poolGroups = activePoolGroups;
}
finally
{
if (_newLockingBehavior)
{
_lock.ExitWriteLock();
}
else
{
Monitor.Exit(this);
}
}
}
}
}