/// <summary>
/// Will find the eldest engine and force-purge it.
/// </summary>
private static void ForceExpireOneEngine(DataEngineCache cache)
{
var engines = cache.m_engines;
if (engines == null)
{
return;
}
IDataEngine oldest = null;
ConcurrentDictionary <string, IDataEngine> container = null;
string scope = null, tenant = null;
foreach (var tenantEnginesRec in engines)
{
foreach (var engineRec in tenantEnginesRec.Value)
{
if (oldest == null || oldest.UtcLastUsedAt > engineRec.Value.UtcLastUsedAt)
{
oldest = engineRec.Value;
container = tenantEnginesRec.Value;
tenant = tenantEnginesRec.Key;
scope = engineRec.Key;
}
}
}
if (oldest != null)
{
cache.m_tracer.InfoFormat("Forced expiration of engine for tenant {0}, scope {1}", tenant, scope);
IDataEngine engine;
if (container.TryRemove(scope, out engine))
{
// only invoke Dispose here if the engine is not active right now
// otherwise, let it be garbage-collected
var ageseconds = (DateTime.UtcNow - engine.UtcLastUsedAt).TotalSeconds;
if (ageseconds < 0)
{
ageseconds = -ageseconds;
}
if (ageseconds > 1.0)
{
engine.Dispose();
}
}
}
}
/// <summary>
/// Will find the eldest engine and force-purge it.
/// </summary>
private static void ForceExpireOneEngine(DataEngineCache cache)
{
var engines = cache.m_engines;
if (engines == null)
{
return;
}
IDataEngine oldest = null;
ConcurrentDictionary<string, IDataEngine> container = null;
string scope = null, tenant = null;
foreach (var tenantEnginesRec in engines)
{
foreach (var engineRec in tenantEnginesRec.Value)
{
if (oldest == null || oldest.UtcLastUsedAt > engineRec.Value.UtcLastUsedAt)
{
oldest = engineRec.Value;
container = tenantEnginesRec.Value;
tenant = tenantEnginesRec.Key;
scope = engineRec.Key;
}
}
}
if (oldest != null)
{
cache.m_tracer.InfoFormat("Forced expiration of engine for tenant {0}, scope {1}", tenant, scope);
IDataEngine engine;
if (container.TryRemove(scope, out engine))
{
// only invoke Dispose here if the engine is not active right now
// otherwise, let it be garbage-collected
var ageseconds = (DateTime.UtcNow - engine.UtcLastUsedAt).TotalSeconds;
if (ageseconds < 0)
{
ageseconds = -ageseconds;
}
if (ageseconds > 1.0)
{
engine.Dispose();
}
}
}
}
