/// <summary>
/// Reload the content of a table into the cache
/// </summary>
/// <param name="database"></param>
/// <param name="customerId"></param>
/// <param name="table"></param>
public void Reload(DatabaseContext database, int customerId, string table)
{
if (!_enable)
{
return;
}
// Check if the reload data is possible
if (!_tick.ContainsKey(customerId) || !_tables.ContainsKey(table) || !_records.ContainsKey(customerId))
{
return;
}
// Clean up cache of the table
Dictionary <string, Dictionary <int, Tuple <DSRecord, InformationRecord> > > currentCache = _records[customerId];
if (!currentCache.ContainsKey(table))
{
return;
}
Debug($"Reloading table '{table}' into the cache for the customer '{customerId}' ...");
Dictionary <int, Tuple <DSRecord, InformationRecord> > currentCacheTable = currentCache[table];
currentCacheTable.Clear();
// Update the content of the cache
DSTable currentTable = _tables[table];
foreach (Tuple <DSRecord, InformationRecord> record in currentTable.ReadRecords(database, customerId))
{
currentCacheTable[record.Item1.Id] = record;
}
Info($"[{customerId}] {currentCacheTable.Count} records read into the table '{table}'");
GC.Collect();
}
/// <summary>
/// Build the schema by introspection (tables, columns and properties)
/// </summary>
/// <param name="schema">Type of DbContext</param>
/// <param name="request"></param>
public DSDatabase(Type schema, IDSRequest request)
{
Schema = schema;
Tables = new Dictionary <string, DSTable>();
_request = request;
if (schema.IsSubclassOf(typeof(DbContext)))
{
// Each table is described by a DbSet<> object
foreach (PropertyInfo property in schema.GetProperties())
{
// Only DbSet<X> contains a table
if (!property.PropertyType.IsGenericType || property.PropertyType.GetGenericTypeDefinition() != typeof(DbSet <>))
{
continue;
}
// Ignore private, protected tables or properties started with "_"
if (property.Name.StartsWith("_") || property.PropertyType.IsNotPublic)
{
continue;
}
// Ignore record not inheritence of DSRecord
if (!property.PropertyType.GetGenericArguments().First().IsSubclassOf(typeof(DSRecord)))
{
continue;
}
DSTable table = new DSTable(this, property, property.PropertyType.GetGenericArguments().First());
Tables[table.Name] = table;
}
}
}
/// <summary>
/// Check if the last tick loaded is different, and only load differences ...
/// </summary>
/// <param name="database"></param>
/// <param name="customerId"></param>
/// <param name="getDatabase"></param>
public void UpdateCache(DatabaseContext database, int customerId, FunctionGetDatabase getDatabase)
{
if (!_enable)
{
return;
}
// Check if the customer is currently loaded
if (!_tick.ContainsKey(customerId))
{
Initialize(database, customerId, getDatabase);
}
// the current customer is available
Lock(customerId); // lock critical section
// If the tick into the cache is not the same as the current one ... update the cache manager
int currentTick = GetTick(database, customerId);
int previousTick = _tick[customerId];
if (currentTick <= previousTick)
{
Unlock(customerId); // unlock critical section
return;
}
Debug($"[{customerId}] Updating cache between {previousTick} and {currentTick} ...");
int nbUpdates = 0;
try
{
// Load all records between the last tick and the new one (only for request successfully executed)
DSTable currentTable = null;
Dictionary <int, Tuple <DSRecord, InformationRecord> > currentContent = null;
foreach (RequestTableRecord request in database._RequestTable.Where(r => r.CustomerId == customerId &&
r.Id != null &&
previousTick < r.Tick && r.Tick <= currentTick).ToList().OrderBy(r => r.Table).ThenBy(r => r.Id))
{
// new table ?
if (currentTable == null || !currentTable.Name.Equals(request.Table))
{
currentTable = null;
currentContent = null;
if (!_tables.ContainsKey(request.Table))
{
if (IsVerbose())
{
Verbose($"[{customerId}] The table '{request.Table}' doesn't exist into the cache. May be, the table doesn't exist into the schemas");
}
continue;
}
currentTable = _tables[request.Table];
currentContent = _records[customerId][request.Table];
}
// read the current record
Tuple <DSRecord, InformationRecord> currentRecord = currentTable.GetRecord(database, request.Id.Value, customerId);
if (currentRecord == null)
{
continue;
}
// Update the cache
currentContent[request.Id.Value] = currentRecord;
nbUpdates++;
}
_tick[customerId] = currentTick;
}
catch (System.Exception ex)
{
Exception($"[{customerId}] Unable to update the cache", ex);
}
Info($"[{customerId}] {nbUpdates} records loaded between {previousTick} and {currentTick}");
Unlock(customerId); // Unlock the critical section
}
