public void Add(TenantInstance instance, Action<string, TenantInstance> removedCallback)
{
if (instance == null)
{
throw new ArgumentNullException("instance");
}
if (removedCallback == null)
{
removedCallback = delegate { };
}
// Add a cache entry for the instance id that will be used as a cache dependency
// for the running instances
var cacheDependencyPolicy = new CacheItemPolicy
{
// Make the "MaxAge" configurable - when the dependency is removed so are the instances
AbsoluteExpiration = DateTimeOffset.UtcNow.AddHours(12)
};
var cacheDependency = new CacheItem(instance.Id.ToString(), instance.Id);
// We need to add the dependency before we set up the instance change monitors,
// otherwise they'll be removed from the cache immediately!
cache.Set(instance.Id.ToString(), instance.Id, cacheDependencyPolicy);
// Now cache the running instance for each identifier
// The policies must be unique since the RemovedCallback can only be called once-per-policy
foreach (var id in instance.Tenant.RequestIdentifiers)
{
cache.Set(new CacheItem(id.Name, instance), GetCacheItemPolicy(removedCallback, cacheDependency));
}
}
private TenantInstance StartInstance(Tenant tenant)
{
var instance = new TenantInstance(tenant);
runningInstances.Add(instance, ShutdownInstance);
Log("Started instance '{0}'", instance.Id);
return instance;
}
private void ShutdownInstance(string identifier, TenantInstance instance)
{
if (instance == null)
{
return;
}
// Make sure all cache entries for this instance are removed (they are all dependent on tenant instance id)
Log("Removing instance '{0}' identifier '{1}'", instance.Id, identifier);
runningInstances.Remove(instance.Id.ToString());
lock (instance)
{
instance.Dispose();
}
}
