// Given an assembly purportedly containing SqlServerTypes for spatial values, attempt to
// create a corersponding Sql spefic DbSpatialServices value backed by types from that assembly.
// Uses a dictionary to ensure that there is at most db spatial service per assembly. It's important that
// this be done in a way that ensures that the underlying SqlTypesAssembly value is also atomized,
// since that's caching compilation.
// Relies on SqlTypesAssembly to verify that the assembly is appropriate.
private static bool TryGetSpatialServiceFromAssembly(Assembly assembly, out SqlSpatialServices services)
{
if (otherSpatialServices == null || !otherSpatialServices.TryGetValue(assembly.FullName, out services))
{
lock (Instance)
{
if (otherSpatialServices == null || !otherSpatialServices.TryGetValue(assembly.FullName, out services))
{
SqlTypesAssembly sqlAssembly;
if (SqlTypesAssembly.TryGetSqlTypesAssembly(assembly, out sqlAssembly))
{
if (otherSpatialServices == null)
{
otherSpatialServices = new Dictionary <string, SqlSpatialServices>(1);
}
services = new SqlSpatialServices(() => sqlAssembly);
otherSpatialServices.Add(assembly.FullName, services);
}
else
{
services = null;
}
}
}
}
return(services != null);
}
internal static bool TryGetSqlTypesAssembly(Assembly assembly, out SqlTypesAssembly sqlAssembly)
{
if (IsKnownAssembly(assembly))
{
sqlAssembly = new SqlTypesAssembly(assembly);
return(true);
}
sqlAssembly = null;
return(false);
}
private static bool TryGetSqlTypesAssembly(out SqlTypesAssembly sqlTypesAssembly)
{
sqlTypesAssembly = SqlTypesAssembly.Latest;
return(sqlTypesAssembly != null);
}