public IDataEngine GetEngine(string tenantId, string scopeId)
{
if (string.IsNullOrEmpty(tenantId))
{
throw new ArgumentNullException("tenantId");
}
if (string.IsNullOrEmpty(scopeId))
{
throw new ArgumentNullException("scopeId");
}
// avoid using GetOrAdd because it may invoke factory method multiple times
ConcurrentDictionary<string, IDataEngine> tenantEngines;
if (!m_engines.TryGetValue(tenantId, out tenantEngines))
{
lock (m_engines)
{
if (!m_engines.TryGetValue(tenantId, out tenantEngines))
{
tenantEngines = new ConcurrentDictionary<string, IDataEngine>();
if (!m_engines.TryAdd(tenantId, tenantEngines))
{
throw new Exception("Failed to add tenant-specific cache of engines for tenant " + tenantId);
}
}
if (tenantEngines == null)
{
throw new Exception("tenantEngines is null, tenant " + tenantId);
}
}
}
// avoid using GetOrAdd because it may invoke factory method multiple times
IDataEngine engine;
if (!tenantEngines.TryGetValue(scopeId, out engine))
{
lock (tenantEngines)
{
if (!tenantEngines.TryGetValue(scopeId, out engine))
{
var engineCount = GetTotalEnginesCount();
if (engineCount > MaxTotalEnginesCount)
{
new Task(x => ForceExpireOneEngine((DataEngineCache) x), this).Start();
}
m_tracer.InfoFormat("Creating new engine for tenant {0}, scope {1}", tenantId, scopeId);
var factory = ObjectFactory.GetNamedInstance<IStorageDriverFactory>(m_storageDriverKey);
var storageDriver = factory.Create();
storageDriver.Initialize(m_tracer, GetDriverConnectionConfig(scopeId, factory));
engine = new DataEngine(m_tracer, m_instanceName, m_maxEngineConcurrency, storageDriver, RequireDescriptor(storageDriver));
if (!tenantEngines.TryAdd(scopeId, engine))
{
throw new Exception(string.Format("Failed to add new engine for tenant {0}, scope {1}", tenantId, scopeId));
}
}
if (engine == null)
{
throw new Exception(string.Format("Engine is null for tenant {0}, scope {1}", tenantId, scopeId));
}
}
}
return engine;
}
public TestableEngineCache(DataEngine engine)
{
Engine = engine;
}
public IDataEngine GetEngine(string tenantId, string scopeId)
{
if (string.IsNullOrEmpty(tenantId))
{
throw new ArgumentNullException("tenantId");
}
if (string.IsNullOrEmpty(scopeId))
{
throw new ArgumentNullException("scopeId");
}
// avoid using GetOrAdd because it may invoke factory method multiple times
ConcurrentDictionary <string, IDataEngine> tenantEngines;
if (!m_engines.TryGetValue(tenantId, out tenantEngines))
{
lock (m_engines)
{
if (!m_engines.TryGetValue(tenantId, out tenantEngines))
{
tenantEngines = new ConcurrentDictionary <string, IDataEngine>();
if (!m_engines.TryAdd(tenantId, tenantEngines))
{
throw new Exception("Failed to add tenant-specific cache of engines for tenant " + tenantId);
}
}
if (tenantEngines == null)
{
throw new Exception("tenantEngines is null, tenant " + tenantId);
}
}
}
// avoid using GetOrAdd because it may invoke factory method multiple times
IDataEngine engine;
if (!tenantEngines.TryGetValue(scopeId, out engine))
{
lock (tenantEngines)
{
if (!tenantEngines.TryGetValue(scopeId, out engine))
{
var engineCount = GetTotalEnginesCount();
if (engineCount > MaxTotalEnginesCount)
{
new Task(x => ForceExpireOneEngine((DataEngineCache)x), this).Start();
}
m_tracer.InfoFormat("Creating new engine for tenant {0}, scope {1}", tenantId, scopeId);
var factory = ObjectFactory.GetNamedInstance <IStorageDriverFactory>(m_storageDriverKey);
var storageDriver = factory.Create();
storageDriver.Initialize(m_tracer, GetDriverConnectionConfig(scopeId, factory));
engine = new DataEngine(m_tracer, m_instanceName, m_maxEngineConcurrency, storageDriver, RequireDescriptor(storageDriver));
if (!tenantEngines.TryAdd(scopeId, engine))
{
throw new Exception(string.Format("Failed to add new engine for tenant {0}, scope {1}", tenantId, scopeId));
}
}
if (engine == null)
{
throw new Exception(string.Format("Engine is null for tenant {0}, scope {1}", tenantId, scopeId));
}
}
}
return(engine);
}