C# 了解NHibernate IUserType及其为什么会留在内存中
为了尝试找出所有内存被占用的位置,我已经分析了一个web应用程序好几天了,它开始显示NHibernate有点像一个内存饥饿的野兽——但我真的只剩下最后一件事了: 自定义类型似乎保存在内存中,这导致了一点内存泄漏 **运行下面的代码后,我分析了内存。在它的左边是一个UserConfig实例(用户实例已经被GC’d了)——因为用户已经离开了,所以我希望UserConfig的一个实例也离开了。“实例保留图”显示: 用户配置 | NHibernate.Type.CustomType | NHibernate.Type.IType[] | NHbernate.Persister.Entity.SingleTableEntityTyperMaster | 系统。集合。。。。。 | 系统。集合。。。。。 | NHibernate.Impl.SessionFactoryImpl | 会话源 我在这里包含了一些代码来演示它(请不要对代码本身发表评论-我写这篇文章纯粹是为了测试这个问题,它不应该是生产就绪的代码) 我在模块的末尾添加了一个GC.Collect(),因此内存快照中的任何内容都是问题的一部分 我只包含了代码的相关部分(如果你喜欢整个项目,请发电子邮件给我) 不使用CustomType不是一个选项 会话工厂…C# 了解NHibernate IUserType及其为什么会留在内存中,c#,asp.net,nhibernate,memory-leaks,fluent-nhibernate,C#,Asp.net,Nhibernate,Memory Leaks,Fluent Nhibernate,为了尝试找出所有内存被占用的位置,我已经分析了一个web应用程序好几天了,它开始显示NHibernate有点像一个内存饥饿的野兽——但我真的只剩下最后一件事了: 自定义类型似乎保存在内存中,这导致了一点内存泄漏 **运行下面的代码后,我分析了内存。在它的左边是一个UserConfig实例(用户实例已经被GC’d了)——因为用户已经离开了,所以我希望UserConfig的一个实例也离开了。“实例保留图”显示: 用户配置 | NHibernate.Type.CustomType | NHiberna
SessionFactory = Fluently.Configure()
.Database(MsSqlConfiguration.MsSql2008.ConnectionString(ConfigurationManager.ConnectionStrings["ConnectionString"].ToString()))
.Mappings(x => GetFluantMappings(x))
.ExposeConfiguration(c =>
{
c.SetProperty("generate_statistics", "true");
c.SetProperty("current_session_context_class", contextClass);
c.SetProperty("cache.use_second_level_cache", "false");
c.SetProperty("cache.use_query_cache", "false");
})
.BuildSessionFactory();
}
catch(FluentConfigurationException ex)
{
throw new SessionSourceException("Error initializing session factory", ex);
}
每个请求的会话httpmodule
private static void BeginRequest(object sender, EventArgs e)
{
ISession session = SessionSource.Instance.SessionFactory.OpenSession();
ManagedWebSessionContext.Bind(HttpContext.Current, session);
}
private static void EndRequest(object sender, EventArgs e)
{
ISession session = ManagedWebSessionContext.Unbind(HttpContext.Current, SessionSource.Instance.SessionFactory);
if (session == null) return;
session.Close();
session.Dispose();
GC.Collect();
}
protected void Page_Load(object sender, EventArgs e)
{
int userId = CreateUser(SessionSource.Instance.SessionFactory);
GetUser(SessionSource.Instance.SessionFactory, userId);
}
private static void GetUser(ISessionFactory sessionFactory, int userId)
{
ISession session = sessionFactory.GetCurrentSession();
User user = session.Get<User>(userId);
//User user = session.Query<User>().Single(u => u.Id == userId);
}
private static int CreateUser(ISessionFactory sessionFactory)
{
User user = new User();
user.Created = DateTime.Now;
user.Email = "first@lastname.com";
user.Enabled = true;
user.FirstName = "first name";
user.LastName = "last name";
user.Password = "password";
user.ScreenName = "firstname lastname";
ISession session = sessionFactory.GetCurrentSession();
session.SaveOrUpdate(user);
return user.Id;
}
aspx页面
private static void BeginRequest(object sender, EventArgs e)
{
ISession session = SessionSource.Instance.SessionFactory.OpenSession();
ManagedWebSessionContext.Bind(HttpContext.Current, session);
}
private static void EndRequest(object sender, EventArgs e)
{
ISession session = ManagedWebSessionContext.Unbind(HttpContext.Current, SessionSource.Instance.SessionFactory);
if (session == null) return;
session.Close();
session.Dispose();
GC.Collect();
}
protected void Page_Load(object sender, EventArgs e)
{
int userId = CreateUser(SessionSource.Instance.SessionFactory);
GetUser(SessionSource.Instance.SessionFactory, userId);
}
private static void GetUser(ISessionFactory sessionFactory, int userId)
{
ISession session = sessionFactory.GetCurrentSession();
User user = session.Get<User>(userId);
//User user = session.Query<User>().Single(u => u.Id == userId);
}
private static int CreateUser(ISessionFactory sessionFactory)
{
User user = new User();
user.Created = DateTime.Now;
user.Email = "first@lastname.com";
user.Enabled = true;
user.FirstName = "first name";
user.LastName = "last name";
user.Password = "password";
user.ScreenName = "firstname lastname";
ISession session = sessionFactory.GetCurrentSession();
session.SaveOrUpdate(user);
return user.Id;
}
受保护的无效页面加载(对象发送方,事件参数e)
{
int userId=CreateUser(SessionSource.Instance.SessionFactory);
GetUser(SessionSource.Instance.SessionFactory,用户ID);
}
私有静态void GetUser(ISessionFactory sessionFactory,int userId)
{
ISession session=sessionFactory.GetCurrentSession();
User=session.Get(userId);
//User User=session.Query().Single(u=>u.Id==userId);
}
私有静态int CreateUser(ISessionFactory sessionFactory)
{
用户=新用户();
user.Created=DateTime.Now;
user.Email=”first@lastname.com";
user.Enabled=true;
user.FirstName=“first name”;
user.LastName=“last name”;
user.Password=“Password”;
user.ScreenName=“firstname lastname”;
ISession session=sessionFactory.GetCurrentSession();
session.SaveOrUpdate(用户);
返回user.Id;
}
用户类和用户映射
public class User
{
public virtual int Id { get; set; }
public virtual string Email { get; set; }
public virtual string ScreenName { get; set; }
public virtual string Password { get; set; }
public virtual string FirstName { get; set; }
public virtual string LastName { get; set; }
public virtual bool Enabled { get; set; }
public virtual DateTime Created { get; set; }
public virtual DateTime? LastLogin { get; set; }
public virtual DateTime? LastActivity { get; set; }
public virtual UserConfig Config { get; set; }
}
[Serializable]
public class UserConfig : List<string>, IUserType
{
public UserConfig() { }
public UserConfig(IEnumerable<string> items) : base(items)
{
}
#region IUserType Members
public object Assemble(object cached, object owner)
{
return DeepCopy(cached);
}
public object DeepCopy(object value)
{
return value;
}
public object Disassemble(object value)
{
return DeepCopy(value);
}
public new bool Equals(object x, object y)
{
if (ReferenceEquals(x, y)) return true;
if (x == null || y == null) return false;
return x.Equals(y);
}
public int GetHashCode(object x)
{
return x.GetHashCode();
}
public bool IsMutable
{
get { return false; }
}
public object NullSafeGet(IDataReader rs, string[] names, object owner)
{
object obj = NHibernateUtil.String.NullSafeGet(rs, names[0]);
if (obj == null)
{
return new UserConfig();
}
return XmlSerialiser.FromXml<UserConfig>(obj as string);
}
public void NullSafeSet(IDbCommand cmd, object value, int index)
{
var parameter = (IDataParameter)cmd.Parameters[index];
if (value == null)
{
parameter.Value = DBNull.Value;
}
else
{
parameter.Value = XmlSerialiser.ToXml<UserConfig>(value);
}
}
public object Replace(object original, object target, object owner)
{
return original;
}
[XmlIgnore]
public Type ReturnedType
{
//the .Net type that this maps to
get { return typeof(UserConfig); }
}
[XmlIgnore]
public SqlType[] SqlTypes
{
//the sql type that this maps to
get { return new[] { SqlTypeFactory.GetString(int.MaxValue), }; }
}
#endregion
}
public class XmlSerialiser
{
public static XmlSerializerNamespaces GetNamespaces()
{
XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
ns.Add(string.Empty, string.Empty);
return ns;
}
//Creates an object from an XML string.
public static T FromXml<T>(string xml) where T : new()
{
return FromXml<T>(xml, () => new T());
}
public static T FromXml<T>(string xml, Func<T> func)
{
if (xml == "<nil-classes type=\"array\" />")
{
return func();
}
XmlSerializer ser = new XmlSerializer(typeof(T));
StringReader stringReader = new StringReader(xml);
XmlTextReader xmlReader = new XmlTextReader(stringReader);
try
{
object obj = ser.Deserialize(xmlReader);
xmlReader.Close();
stringReader.Close();
return (T) obj;
}
finally
{
stringReader.Dispose();
}
}
public static string ToXml(Type type, object obj)
{
XmlSerializer ser = new XmlSerializer(type);
MemoryStream memStream = new MemoryStream();
XmlTextWriter xmlWriter = new XmlTextWriter(memStream, Encoding.Unicode);
try
{
xmlWriter.Namespaces = true;
ser.Serialize(xmlWriter, obj, GetNamespaces());
xmlWriter.Close();
memStream.Close();
string xml = Encoding.Unicode.GetString(memStream.GetBuffer());
xml = xml.Substring(xml.IndexOf(Convert.ToChar(60)));
xml = xml.Substring(0, (xml.LastIndexOf(Convert.ToChar(62)) + 1));
return xml;
}
finally
{
memStream.Dispose();
}
}
//Serializes the <i>Obj</i> to an XML string.
public static string ToXml<T>(object obj)
{
return ToXml(typeof(T), obj);
}
}
public sealed class UserMap : ClassMap<User>
{
public UserMap()
{
Id(x => x.Id).Column("UserId");
Map(x => x.Created);
Map(x => x.Email);
Map(x => x.Enabled);
Map(x => x.FirstName);
Map(x => x.LastActivity);
Map(x => x.LastLogin);
Map(x => x.LastName);
Map(x => x.Password);
Map(x => x.ScreenName);
Map(x => x.Config).CustomType(typeof(UserConfig));
}
}
公共类用户
{
公共虚拟整数Id{get;set;}
公共虚拟字符串电子邮件{get;set;}
公共虚拟字符串屏幕名称{get;set;}
公共虚拟字符串密码{get;set;}
公共虚拟字符串FirstName{get;set;}
公共虚拟字符串LastName{get;set;}
启用公共虚拟bool的{get;set;}
创建的公共虚拟日期时间{get;set;}
公共虚拟日期时间?LastLogin{get;set;}
公共虚拟日期时间?LastActivity{get;set;}
公共虚拟用户配置配置{get;set;}
}
[可序列化]
公共类UserConfig:List,IUserType
{
public UserConfig(){}
公共用户配置(IEnumerable项):基本(项)
{
}
#区域类型成员
公共对象集合(对象缓存,对象所有者)
{
返回DeepCopy(缓存);
}
公共对象深度复制(对象值)
{
返回值;
}
公共对象(对象值)
{
返回DeepCopy(值);
}
公共新布尔等于(对象x、对象y)
{
if(ReferenceEquals(x,y))返回true;
如果(x==null | | y==null)返回false;
返回x等于(y);
}
公共int GetHashCode(对象x)
{
返回x.GetHashCode();
}
公共布尔可换
{
获取{return false;}
}
公共对象NullSafeGet(IDataReader rs,字符串[]名称,对象所有者)
{
object obj=NHibernateUtil.String.NullSafeGet(rs,names[0]);
if(obj==null)
{
返回新的UserConfig();
}
返回XmlSerialiser.FromXml(obj作为字符串);
}
public void NullSafeSet(IDbCommand cmd,对象值,int索引)
{
var参数=(IDataParameter)命令参数[索引];
如果(值==null)
{
parameter.Value=DBNull.Value;
}
其他的
{
parameter.Value=XmlSerialiser.ToXml(值);
}
}
公共对象替换(对象原始、对象目标、对象所有者)
{
归还原件;
}
[XmlIgnore]
公共类型返回类型
{
//此映射到的.Net类型
获取{return typeof(UserConfig);}
}
[XmlIgnore]
公共SqlType[]SqlTypes
{
//此映射到的sql类型
获取{returnnew[]{SqlTypeFactory.GetString(int.MaxValue),};}
}
#端区
}
公共类XmlSerialiser
{
公共静态XmlSerializerNamespaces GetNamespaces()
{
XmlSerializerNamespaces ns=新的XmlSerializerNamespaces();
ns.Add(string.Empty,string.Empty);
返回ns;
}
//从XML字符串创建对象。
公共静态T FromXml(字符串xml),其中T:new()
{
从xml返回(xml,()=>newt());
}
公共静态T FromXml(字符串xml,Func Func)
{
如果(xml==“”)
{
返回func();
}
XmlSerializer ser=新的XmlSerializer(typeof(T));
StringReader StringReader=新的StringReader(xml);
XmlTextReader=新的XmlTextReader(stringReader);
尝试
{
object obj=ser.Deserialize(xmlReader);
xmlReader.Close();
stringReader.Close();
返回(T)obj;
}
最后
{
stringReader.Dispose();
}
}
公共静态字符串ToXml(类型,对象obj)
{
XmlSerializer ser=新的XmlSerializer(t