/// <summary>
/// Flushes all of the items in the cache.
/// </summary>
/// <param name="values">The collection containing the values to flush.</param>
void Flush(IEnumerable <KeyValuePair <CacheKey, int> > values)
{
foreach (var v in values)
{
// Only execute the query when the value is non-zero (it is possible to get a zero value when you let your
// counters decrement)
if (v.Value != 0)
{
var value = new ObjectEventAmount <TObjectID, TEventID>(v.Key.ObjectID, v.Key.EventID, v.Value);
WriteValue(value);
}
}
}
/// <summary>
/// Writes a single value to the database.
/// </summary>
/// <param name="value">The <see cref="ObjectEventAmount{T,U}"/>.</param>
void WriteValue(ObjectEventAmount <TObjectID, TEventID> value)
{
try
{
_query.Execute(value);
}
catch (Exception ex)
{
const string errmsg =
"Failed to execute EventCounter query on `{0}` (object: {1}, event: {2})." +
" Going to drop the value (value: {3}) instead of retrying. There is a good chance that the exception was caused from" +
" trying to insert a record for a foreign key that no longer exists, and a much smaller chance that we tried" +
" to insert a record for a foreign key that does not yet exist. Exception: {4}";
if (log.IsWarnEnabled)
{
log.WarnFormat(errmsg, this, value.ObjectID, value.EventID, value.Amount, ex);
}
}
}
/// <summary>
/// When overridden in the derived class, sets the database parameters values <paramref name="p"/>
/// based on the values specified in the given <paramref name="item"/> parameter.
/// </summary>
/// <param name="p">Collection of database parameters to set the values for.</param>
/// <param name="item">The value or object/struct containing the values used to execute the query.</param>
protected override void SetParameters(DbParameterValues p, ObjectEventAmount <TObjectID, TEventID> item)
{
p[_objectParameterName] = item.ObjectID;
p[_eventParameterName] = item.EventID;
p[_counterParameterName] = item.Amount;
}
/// <summary>
/// Writes a single counter value to the database.
/// </summary>
/// <param name="source">The source object to increment the counter for.</param>
/// <param name="e">The event to increment.</param>
/// <param name="amount">The amount to increment.</param>
void WriteValue(TObjectID source, TEventID e, int amount)
{
var value = new ObjectEventAmount <TObjectID, TEventID>(source, e, amount);
WriteValue(value);
}