public T Execute(object[] parameters)
{
var db = (IDataContext)parameters[0];
var ctx = DataContextInfo.Create(db);
var query = GetInfo(db);
return((T)query.GetElement(null, ctx, _expression, parameters));
}
private Query <T> GetInfo(IDataContext dataContext)
{
var dataContextInfo = DataContextInfo.Create(dataContext);
string lastContextID;
MappingSchema lastMappingSchema;
Query <T> query;
lock (_sync)
{
lastContextID = _lastContextID;
lastMappingSchema = _lastMappingSchema;
query = _lastQuery;
}
var contextID = dataContextInfo.ContextID;
var mappingSchema = dataContextInfo.MappingSchema;
if (lastContextID != contextID || lastMappingSchema != mappingSchema)
{
query = null;
}
if (query == null)
{
var key = new { contextID, mappingSchema };
lock (_sync)
_infos.TryGetValue(key, out query);
if (query == null)
{
lock (_sync)
{
_infos.TryGetValue(key, out query);
if (query == null)
{
query =
new ExpressionBuilder(new Query <T>(), dataContextInfo, _expression,
_lambda.Parameters.ToArray())
.Build <T>();
_infos.Add(key, query);
_lastContextID = contextID;
_lastMappingSchema = mappingSchema;
_lastQuery = query;
}
}
}
}
return(query);
}
