/// <summary>
/// On cache miss.
/// </summary>
protected internal override void OnCacheMiss(Container container, IQueryable query, string key)
{
// Patch model to include schema information in LinqToSql, this is a requirement for SqlDependency to work.
LinqToSql.AddSchemaToModel(query);
var dependency = new System.Data.SqlClient.SqlDependency();
dependency.OnChange += (sender, args) =>
{
if (args.Info == SqlNotificationInfo.Invalid)
{
var unsupportedQueryHandler = UnsupportedQuery;
if (unsupportedQueryHandler != null)
{
unsupportedQueryHandler(this, new SqlDependencyEventArgs(query));
}
}
else
{
container.Delete(key);
}
OnChangeReceived.Set();
};
CallContext.SetData(CookieName, dependency.Id);
}
public LinqCacheConfiguration(Container container, Invalidator invalidator)
{
Invalidator = invalidator;
Container = container;
}
/// <summary>
/// Whenever the cache is hit.
/// </summary>
protected internal override void OnCacheHit(Container container, IQueryable query, string key, object cachedValue)
{
container.Set(key, cachedValue, Duration);
}
/// <summary>
/// On initialization of the invalidator.
/// </summary>
protected internal virtual void OnInit(Container container, IQueryable query, string key)
{
}
/// <summary>
/// After a value has been refreshed.
/// </summary>
protected internal virtual void OnCacheRefresh(Container container, IQueryable query, string key, object value)
{
}
/// <summary>
/// After a cache miss has occured.
/// </summary>
protected internal virtual void OnCacheMiss(Container container, IQueryable query, string key)
{
}
/// <summary>
/// After a cache hit has occured.
/// </summary>
protected internal virtual void OnCacheHit(Container container, IQueryable query, string key, object cachedValue)
{
}
/// <summary>
/// On cache refresh.
/// </summary>
protected internal override void OnCacheRefresh(Container container, IQueryable query, string key, object value)
{
CallContext.FreeNamedDataSlot(CookieName);
}
/// <summary>
/// On init.
/// </summary>
protected internal override void OnInit(Container container, IQueryable query, string key)
{
_connectionString = LinqToSql.GetConnectionString(query) ?? EntityFramework.GetConnectionString(query);
if (_connectionString == null)
{
throw LinqCacheException.ContextIsNotSupported;
}
try
{
System.Data.SqlClient.SqlDependency.Start(_connectionString);
}
catch (InvalidOperationException exception)
{
if (exception.Message == BrokerNotEnabledMessage)
{
throw LinqCacheException.BrokerIsNotEnabled(exception);
}
throw;
}
}
