private async Task SubscribePeriodically()
{
while (!_stopRequested)
{
var subscribeTasks = new List <Task>();
var events = _eventSubscriber.SubscribedEvents.ToList();
foreach (var eventDesc in events)
{
if (!IsExternal(eventDesc))
{
continue;
}
var client = GetEventingClient(eventDesc.Service);
var subscribers = _eventSubscriber.GetSubscribers(eventDesc);
subscribeTasks.Add(client.SubscribeAsync(eventDesc, subscribers));
}
try
{
await Task.WhenAll(subscribeTasks);
}
catch
{
}
await Task.Delay(5_000);
}
}
public async Task PublishAsync(EventPublishData data, PublishPreferences preferences)
{
var eventDesc = new EventDescriptor {
Service = data.Service, Event = data.Event
};
var subscribers = _eventSubscriber.GetSubscribers(eventDesc).ToList();
if (subscribers.Count == 0)
{
return;
}
foreach (var subscriber in subscribers)
{
var invokeData = new MethodInvocationData
{
IntentId = _idGenerator.NewId(),
Service = subscriber.Service,
Method = subscriber.Method,
Parameters = data.Parameters,
FlowContext = data.FlowContext,
Caller = new CallerDescriptor(data.Service, data.Event, data.IntentId)
};
InvokeInBackground(invokeData, preferences);
}
}
public Task <IEnumerable <IMessageListener> > StartListeningAsync(
IConfiguration configuration,
IServiceDefinition serviceDefinition,
IDictionary <IEventDefinition, IConfiguration> eventConfigMap,
CancellationToken ct)
{
// TODO: there are many scenarios that are not supported by the following code.
// For example, exchange's connection is different from services' queues.
var baseConnectionSettings = new ConnectionSettings();
configuration.Bind(baseConnectionSettings);
var baseConnection = _connectionManager.GetConnection(baseConnectionSettings);
var baseChannel = baseConnection.CreateModel();
foreach (var eventDefinition in serviceDefinition.Events)
{
if (!eventConfigMap.TryGetValue(eventDefinition, out var eventConfiguration))
{
eventConfiguration = configuration;
}
var listenerSettings = RabbitMQCommunicationMethod.CreateEventsDefaultSettings();
eventConfiguration.Bind(listenerSettings);
var exchangeName = listenerSettings.ExchangeName
.Replace("{serviceName}", serviceDefinition.Name)
.Replace("{eventName}", eventDefinition.Name);
// TODO: declare once? what's the penalty?
baseChannel.ExchangeDeclare(
exchangeName,
type: "fanout",
durable: true,
autoDelete: false,
arguments: null);
var eventDesc = new EventDescriptor
{
Service = new ServiceId {
Name = serviceDefinition.Name
},
Event = _eventIdProvider.GetId(eventDefinition.EventInfo)
};
foreach (var subscriber in _eventSubscriber.GetSubscribers(eventDesc))
{
if (!_serviceResolver.TryResolve(subscriber.Service, out var subscriberServiceReference))
{
continue;
}
if (!_methodResolver.TryResolve(subscriberServiceReference.Definition, subscriber.Method, out var subscriberMethodReference))
{
continue;
}
var subscriberMethodConfiguration = _communicationModelConfiguration.GetMethodConfiguration(subscriberMethodReference.Definition, "communication");
var subscriberSettings = RabbitMQCommunicationMethod.CreateMethodsDefaultSettings();
subscriberMethodConfiguration.Bind(subscriberSettings);
var subscriberQueueName = subscriberSettings.QueueName
.Replace("{serviceName}", subscriberServiceReference.Definition.Name)
.Replace("{methodName}", subscriberMethodReference.Definition.Name);
// TODO: declare once? what's the penalty?
baseChannel.QueueBind(
queue: subscriberQueueName,
exchange: exchangeName,
routingKey: "",
arguments: null);
}
}
// No direct listeners to RabbitMQ Exchanges, just configure exchange-queue bindings.
// TODO: if events (or subscribers) use a different connection,
// need to create a queue and a listener in that RabbitMQ instance.
return(Task.FromResult <IEnumerable <IMessageListener> >(Array.Empty <IMessageListener>()));
}
public async Task StartAsync(CancellationToken ct)
{
foreach (var serviceDefinition in _communicationModel.Services)
{
if (serviceDefinition.Type == ServiceType.External)
{
var serviceConfig = _communicationModelConfiguration.GetEventsConfiguration(serviceDefinition, CommunicationSectionName);
var serviceCommunicationType = GetCommunicationType(serviceConfig);
var serviceId = new ServiceId {
Name = serviceDefinition.Name
};
var anySubscriberToAnyEvent = false;
var eventOverridesMap = new Dictionary <string, Dictionary <IEventDefinition, IConfiguration> >(StringComparer.OrdinalIgnoreCase);
foreach (var eventDefinition in serviceDefinition.Events)
{
var eventId = _eventIdProvider.GetId(eventDefinition.EventInfo);
var eventDesc = new EventDescriptor {
Service = serviceId, Event = eventId
};
var subscribers = _eventSubscriber.GetSubscribers(eventDesc).ToList();
if (subscribers.Count == 0)
{
continue;
}
var anySubscriberToThisEvent = false;
foreach (var subscriber in subscribers)
{
if (_serviceResolver.TryResolve(subscriber.Service, out _))
{
anySubscriberToThisEvent = true;
anySubscriberToAnyEvent = true;
break;
}
}
if (!anySubscriberToThisEvent)
{
continue;
}
if (_communicationModelConfiguration
.GetEventOverrideLevels(eventDefinition, CommunicationSectionName)
.HasFlag(ConfigOverrideLevels.Primitive))
{
var eventConfig = _communicationModelConfiguration.GetEventConfiguration(eventDefinition);
var eventCommunicationType = GetCommunicationType(eventConfig);
if (!eventOverridesMap.TryGetValue(eventCommunicationType, out var configMap))
{
configMap = new Dictionary <IEventDefinition, IConfiguration>();
eventOverridesMap.Add(eventCommunicationType, configMap);
}
configMap.Add(eventDefinition, eventConfig);
}
}
if (anySubscriberToAnyEvent)
{
if (!eventOverridesMap.TryGetValue(serviceCommunicationType, out var configMap))
{
configMap = new Dictionary <IEventDefinition, IConfiguration>();
}
await StartListeningEventsAsync(serviceCommunicationType, serviceDefinition, serviceConfig, configMap, ct);
var extraCommTypes = eventOverridesMap.Keys.Where(c => !string.Equals(c, serviceCommunicationType, StringComparison.OrdinalIgnoreCase));
foreach (var extraCommType in extraCommTypes)
{
configMap = eventOverridesMap[extraCommType];
await StartListeningEventsAsync(extraCommType, serviceDefinition, serviceConfig, configMap, ct);
}
}
}
else
{
var methodOverridesMap = new Dictionary <string, Dictionary <IMethodDefinition, IConfiguration> >(StringComparer.OrdinalIgnoreCase);
var eventOverridesMap = new Dictionary <string, Dictionary <IEventDefinition, IConfiguration> >(StringComparer.OrdinalIgnoreCase);
foreach (var methodDefinition in serviceDefinition.Methods)
{
if (_communicationModelConfiguration
.GetMethodOverrideLevels(methodDefinition, CommunicationSectionName)
.HasFlag(ConfigOverrideLevels.Primitive))
{
var methodConfig = _communicationModelConfiguration.GetMethodConfiguration(methodDefinition);
var methodCommunicationType = GetCommunicationType(methodConfig);
if (!methodOverridesMap.TryGetValue(methodCommunicationType, out var configMap))
{
configMap = new Dictionary <IMethodDefinition, IConfiguration>();
methodOverridesMap.Add(methodCommunicationType, configMap);
}
configMap.Add(methodDefinition, methodConfig);
}
}
foreach (var eventDefinition in serviceDefinition.Events)
{
if (_communicationModelConfiguration
.GetEventsOverrideLevels(serviceDefinition, CommunicationSectionName)
.HasFlag(ConfigOverrideLevels.Primitive))
{
var eventConfig = _communicationModelConfiguration.GetEventConfiguration(eventDefinition);
var eventCommunicationType = GetCommunicationType(eventConfig);
if (!eventOverridesMap.TryGetValue(eventCommunicationType, out var configMap))
{
configMap = new Dictionary <IEventDefinition, IConfiguration>();
eventOverridesMap.Add(eventCommunicationType, configMap);
}
configMap.Add(eventDefinition, eventConfig);
}
}
var hasQueriesOverride = (_communicationModelConfiguration
.GetQueriesOverrideLevels(serviceDefinition, CommunicationSectionName)
& (ConfigOverrideLevels.BasePrimitives | ConfigOverrideLevels.ServiceTypePrimitives | ConfigOverrideLevels.ServicePrimitives)) != default;
var hasCommandsOverride = (_communicationModelConfiguration
.GetCommandsOverrideLevels(serviceDefinition, CommunicationSectionName)
& (ConfigOverrideLevels.BasePrimitives | ConfigOverrideLevels.ServiceTypePrimitives | ConfigOverrideLevels.ServicePrimitives)) != default;
if (hasQueriesOverride || hasCommandsOverride)
{
var allQueriesConfig = _communicationModelConfiguration.GetQueriesConfiguration(serviceDefinition, CommunicationSectionName);
var allQueriesCommunicationType = GetCommunicationType(allQueriesConfig);
if (!methodOverridesMap.TryGetValue(allQueriesCommunicationType, out var methodConfigMap))
{
methodConfigMap = new Dictionary <IMethodDefinition, IConfiguration>();
}
await StartHadlingMethodsAsync(allQueriesCommunicationType, serviceDefinition, allQueriesConfig, methodConfigMap, ct);
var allCommandsConfig = _communicationModelConfiguration.GetCommandsConfiguration(serviceDefinition, CommunicationSectionName);
var allCommandsCommunicationType = GetCommunicationType(allCommandsConfig);
if (!methodOverridesMap.TryGetValue(allCommandsCommunicationType, out methodConfigMap))
{
methodConfigMap = new Dictionary <IMethodDefinition, IConfiguration>();
}
await StartHadlingMethodsAsync(allCommandsCommunicationType, serviceDefinition, allCommandsConfig, methodConfigMap, ct);
var methodsExtraCommTypes = methodOverridesMap.Keys.Where(c =>
!string.Equals(c, allQueriesCommunicationType, StringComparison.OrdinalIgnoreCase) &&
!string.Equals(c, allCommandsCommunicationType, StringComparison.OrdinalIgnoreCase));
foreach (var methodExtraCommType in methodsExtraCommTypes)
{
methodConfigMap = methodOverridesMap[methodExtraCommType];
var queryConfigMap = new Dictionary <IMethodDefinition, IConfiguration>();
var commandConfigMap = new Dictionary <IMethodDefinition, IConfiguration>();
foreach (var pair in methodConfigMap)
{
if (pair.Key.IsQuery)
{
queryConfigMap.Add(pair.Key, pair.Value);
}
else
{
commandConfigMap.Add(pair.Key, pair.Value);
}
}
if (queryConfigMap.Count > 0)
{
await StartHadlingMethodsAsync(methodExtraCommType, serviceDefinition, allQueriesConfig, queryConfigMap, ct);
}
if (commandConfigMap.Count > 0)
{
await StartHadlingMethodsAsync(methodExtraCommType, serviceDefinition, allCommandsConfig, commandConfigMap, ct);
}
}
}
else
{
var serviceConfig = _communicationModelConfiguration.GetServiceConfiguration(serviceDefinition, CommunicationSectionName);
var serviceCommunicationType = GetCommunicationType(serviceConfig);
if (!methodOverridesMap.TryGetValue(serviceCommunicationType, out var methodConfigMap))
{
methodConfigMap = new Dictionary <IMethodDefinition, IConfiguration>();
}
await StartHadlingMethodsAsync(serviceCommunicationType, serviceDefinition, serviceConfig, methodConfigMap, ct);
var methodsExtraCommTypes = methodOverridesMap.Keys.Where(c => !string.Equals(c, serviceCommunicationType, StringComparison.OrdinalIgnoreCase));
foreach (var methodExtraCommType in methodsExtraCommTypes)
{
methodConfigMap = methodOverridesMap[methodExtraCommType];
await StartHadlingMethodsAsync(methodExtraCommType, serviceDefinition, serviceConfig, methodConfigMap, ct);
}
}
var allEventsConfig = _communicationModelConfiguration.GetEventsConfiguration(serviceDefinition, CommunicationSectionName);
var allEventsCommunicationType = GetCommunicationType(allEventsConfig);
if (!eventOverridesMap.TryGetValue(allEventsCommunicationType, out var eventConfigMap))
{
eventConfigMap = new Dictionary <IEventDefinition, IConfiguration>();
}
await StartListeningEventsAsync(allEventsCommunicationType, serviceDefinition, allEventsConfig, eventConfigMap, ct);
var eventsExtraCommTypes = eventOverridesMap.Keys.Where(c => !string.Equals(c, allEventsCommunicationType, StringComparison.OrdinalIgnoreCase));
foreach (var eventExtraCommType in eventsExtraCommTypes)
{
eventConfigMap = eventOverridesMap[eventExtraCommType];
await StartListeningEventsAsync(eventExtraCommType, serviceDefinition, allEventsConfig, eventConfigMap, ct);
}
}
}
}
