/// <summary>
/// Gets the alias. Note: this is the more exceptional case, and should probably removed altogether.
/// </summary>
/// <param name="id">The id.</param>
/// <param name="direction">The direction.</param>
/// <returns>
/// The alias represented by the specified id.
/// </returns>
public static EntityAlias GetAlias(long id, Direction direction = Direction.Forward)
{
// Obsolete .. people shouldn't be resolving IDs to aliases
var key = new Tuple <long, Direction>(id, direction);
CacheEntry entry;
if (_idCache.TryGetValue(key, out entry))
{
return(entry == null ? null : entry.Alias);
}
EntityAlias alias = GetAliasByIdFromDatabase(id, direction);
if (alias == null)
{
_idCache[key] = null;
}
else
{
entry = new CacheEntry {
Alias = alias, Id = id, Direction = direction
};
_aliasCache[alias] = entry;
_idCache[key] = entry;
}
return(alias);
}
/// <summary>
/// Gets the id.
/// </summary>
/// <param name="alias">The alias.</param>
/// <returns>
/// The entity id represented by the specified alias.
/// </returns>
public static long GetId(string alias)
{
EntityAlias entityAlias = new EntityAlias(alias);
long id = GetId(entityAlias);
return(id);
}
/// <summary>
/// Gets the alias by id from database.
/// </summary>
/// <param name="id">The id.</param>
/// <param name="direction">The direction.</param>
/// <returns>
/// The entity alias if found, null otherwise
/// </returns>
private static EntityAlias GetAliasByIdFromDatabase(long id, Direction direction)
{
EntityAlias alias;
using (DatabaseContext ctx = DatabaseContext.GetContext( ))
using (IDbCommand command = ctx.CreateCommand())
{
/////
// TODO: Replace with a stored procedure call.
/////
command.CommandText = @"-- Entity: Resolve ID to alias
SELECT a.Namespace, a.Data
FROM dbo.Data_Alias a
WHERE a.EntityId = @id AND a.AliasMarkerId = @direction AND a.TenantId = @tenantId";
ctx.AddParameter(command, "@id", DbType.Int64, id);
ctx.AddParameter(command, "@direction", DbType.Int32, direction == Direction.Forward ? 0 : 1);
ctx.AddParameter(command, "@tenantId", DbType.Int64, RequestContext.TenantId);
using (IDataReader reader = command.ExecuteReader())
{
if (reader != null && reader.Read())
{
alias = new EntityAlias(reader.GetString(0), reader.GetString(1));
}
else
{
return(null);
}
}
}
return(alias);
}
/// <summary>
/// Preload all aliases in the current tenant.
/// </summary>
public static void PreloadAliases()
{
using (Profiler.Measure("Preload Aliases"))
using (DatabaseContext ctx = DatabaseContext.GetContext())
using (IDbCommand command = ctx.CreateCommand())
{
/////
// TODO: Replace with a stored procedure call.
/////
command.CommandText = @"-- Entity: Preload aliases
SELECT Namespace, Data Alias, EntityId, AliasMarkerId
FROM dbo.Data_Alias
WHERE TenantId = @tenantId AND Data IS NOT NULL";
ctx.AddParameter(command, "@tenantId", DbType.Int64, RequestContext.TenantId);
using (IDataReader reader = command.ExecuteReader())
{
while (reader != null && reader.Read())
{
string ns = reader.GetString(0);
string alias = reader.GetString(1);
long id = reader.GetInt64(2);
Direction direction = reader.GetInt32(3) == 0 ? Direction.Forward : Direction.Reverse;
EntityAlias entityAlias = new EntityAlias(ns, alias);
CacheEntry cacheEntry = new CacheEntry {
Id = id, Direction = direction, Alias = entityAlias
};
_aliasCache[entityAlias] = cacheEntry;
}
}
}
}
private long GetId(ref long stored, string ns, string alias)
{
if (stored == 0)
{
// (Unfortunately) presently the fastest way to get an ID.
EntityAlias ea = new EntityAlias(ns, alias, true);
stored = EntityIdentificationCache.GetId(ea);
}
return(stored);
}
/// <summary>
/// Gets the id.
/// </summary>
/// <param name="alias">The alias.</param>
/// <returns>
/// The entity id represented by the specified alias.
/// </returns>
public static long GetId(EntityAlias alias)
{
long id;
if (!TryGetId(alias, out id))
{
throw new ArgumentException(@"The alias " + alias + @" does not represent a known entity.", "alias");
}
return(id);
}
/// <summary>
/// Tries to get the id.
/// </summary>
/// <param name="alias">The alias.</param>
/// <param name="id">The id.</param>
/// <returns>True if the id was found; false otherwise.</returns>
public static bool TryGetId(EntityAlias alias, out long id)
{
CacheEntry entry;
if (TryGetEntry(alias, out entry))
{
id = entry.Id;
return(true);
}
id = -1;
return(false);
}
/// <summary>
/// Converts the current entity alias to its corresponding entity id.
/// </summary>
/// <param name="alias">The alias.</param>
/// <returns>
/// Entity id of the current entity alias.
/// </returns>
public static long ToEntityId(EntityAlias alias)
{
if (alias == null || alias.Alias == null)
{
throw new ArgumentNullException("alias");
}
if (alias.Alias.Length == 0)
{
throw new ArgumentException(@"alias was empty", "alias");
}
return(EntityIdentificationCache.GetId(alias));
}
/// <summary>
/// Gets the direction of an alias.
/// </summary>
/// <param name="alias">The alias.</param>
/// <returns>
/// The Direction represented by the specified alias.
/// </returns>
public static Direction GetDirection(EntityAlias alias)
{
if (alias == null)
{
throw new ArgumentNullException("alias");
}
CacheEntry entry;
if (TryGetEntry(alias, out entry))
{
return(entry.Direction);
}
throw new ArgumentException(string.Format("The specified alias does not represent a known entity: {0}:{1} ", alias.Namespace, alias.Alias), "alias");
}
/// <summary>
/// Resolves the identifier.
/// </summary>
public long ResolveId( )
{
if (_id == 0 && !_serializing)
{
if (_entity != null)
{
_id = _entity.Id;
}
else if (Alias != null)
{
EntityAlias ea = new EntityAlias(Namespace ?? "core", Alias, true);
_id = EntityIdentificationCache.GetId(ea);
}
else
{
return(0);
}
}
return(_id);
}
/// <summary>
/// Tries to get the id.
/// </summary>
/// <param name="alias">The alias.</param>
/// <param name="cacheEntry">The cache entry.</param>
/// <returns>
/// True if the id was found; false otherwise.
/// </returns>
private static bool TryGetEntry(EntityAlias alias, out CacheEntry cacheEntry)
{
// Check cache
if (_aliasCache.TryGetValue(alias, out cacheEntry))
{
return(true);
}
// Check database
using (DatabaseContext ctx = DatabaseContext.GetContext())
using (IDbCommand command = ctx.CreateCommand())
{
command.CommandText = "dbo.spResolveAlias";
command.CommandType = CommandType.StoredProcedure;
ctx.AddParameter(command, "@alias", DbType.String, alias.Alias);
ctx.AddParameter(command, "@namespace", DbType.String, alias.Namespace);
ctx.AddParameter(command, "@tenantId", DbType.Int64, RequestContext.TenantId);
using (IDataReader reader = command.ExecuteReader())
{
if (reader != null && reader.Read())
{
long id = reader.GetInt64(0);
Direction direction = reader.GetInt32(1) == 0 ? Direction.Forward : Direction.Reverse;
cacheEntry = new CacheEntry {
Id = id, Direction = direction, Alias = alias
};
_aliasCache[alias] = cacheEntry;
}
else
{
// TODO: should we cache alias misses?
return(false);
}
}
}
return(true);
}
/// <summary>
/// Gets the id.
/// </summary>
/// <param name="alias">The alias.</param>
/// <returns>
/// The entity id represented by the specified alias.
/// </returns>
public static bool AliasIsCached(EntityAlias alias)
{
return(_aliasCache.ContainsKey(alias));
}
