public static IAutoScalerHandler CreateAutoScaler(IDictionary <string, string> resourceDetails, IAutoScalerPolicy policy)
{
var autoScaler = new Handlers.AutoScalerHandler();
autoScaler.Initialize(resourceDetails, policy);
return(autoScaler);
}
/// <summary>
/// Initializes all required resources by the AutoSclaer
/// </summary>
public void Initialize(IDictionary <string, string> resourceDetails, IAutoScalerPolicy policy)
{
if (resourceDetails == null)
{
throw new ArgumentException("Argument 'resourceDetails' cannot be null, missing properties for initialization in AutoScaler!");
}
//
// Read configuration settings
//
_defaultBatchId = resourceDetails[Constants.QUEUE_HANDLER_INIT_PROP_DEFAULT_BATCH_ID];
_storageConn = resourceDetails[Constants.QUEUE_HANDLER_INIT_PROP_STORAGECONNECTION];
_serviceBusConn = resourceDetails[GlobalConstants.SERVICEBUS_INTERNAL_CONNECTIONSTRING_CONFIGNAME];
_checkForJobProcessorCommandsIntervalInSeconds = int.Parse(resourceDetails[GlobalConstants.GERES_CONFIG_AUTOSCALER_CHECKFORJOBHOSTUPDATES_INTERVAL]);
if (string.IsNullOrEmpty(_defaultBatchId) || string.IsNullOrEmpty(_storageConn))
{
throw new ArgumentException("Missing properties in resourceDetails parameter!");
}
//
// Check the loaded policy
//
if (policy == null)
{
throw new ArgumentException("Missing property for autoscaler policy!");
}
_policy = policy;
//
// Create all required repositories
//
_jobHostRepository = RepositoryFactory.CreateJobHostRepository(_storageConn, RoleEnvironment.DeploymentId);
_batchRepository = RepositoryFactory.CreateBatchRepository(_storageConn);
_roleOpsRepository = RepositoryFactory.CreateRoleOperationStatusRepository(_storageConn);
//
// Connect to storage for the jobs-queue
//
var cloudAccount = CloudStorageAccount.Parse(_storageConn);
_cloudQueueClient = cloudAccount.CreateCloudQueueClient();
_defaultQueue = _cloudQueueClient.GetQueueReference(_defaultBatchId);
_defaultQueue.CreateIfNotExists();
//
// Connect to the service bus for autoscaler commands
//
_jobHostServiceBus = new JobHostServiceBus(_serviceBusConn, GlobalConstants.SERVICEBUS_INTERNAL_TOPICS_COMMANDSFORAUTOSCALER,
GlobalConstants.SERVICEBUS_INTERNAL_TOPICS_COMMANDSFORJOBHOST);
var subscribeToJobHostCommandsTask = Task.Run(() =>
{
SubscriptionClient client = null;
while (true)
{
try
{
if (client == null || client.IsClosed)
{
client = _jobHostServiceBus.CreateSubscription(GlobalConstants.SERVICEBUS_INTERNAL_TOPICS_COMMANDSFORAUTOSCALER,
GlobalConstants.SERVICEBUS_INTERNAL_SUBSCRIPTION_JOBHOSTUPDATES);
}
var msg = client.Receive(TimeSpan.FromSeconds(_checkForJobProcessorCommandsIntervalInSeconds));
if (msg != null)
{
if (ProcessCommandFromJobHost(msg))
{
msg.Complete();
}
else
{
msg.Abandon();
}
}
}
catch (Exception ex)
{
client = null;
Geres.Diagnostics.GeresEventSource.Log.AutoScalerWorkerAutoScalerListenForJobHostUpdatesFailed
(
RoleEnvironment.CurrentRoleInstance.Id, RoleEnvironment.DeploymentId,
string.Format("Topic: {0}, Subscription: {1}", GlobalConstants.SERVICEBUS_INTERNAL_SUBSCRIPTION_JOBHOSTUPDATES,
GlobalConstants.SERVICEBUS_INTERNAL_TOPICS_COMMANDSFORAUTOSCALER),
ex.Message,
ex.StackTrace
);
}
}
});
}
