public static async Task <int> Main(string[] args)
{
// enumerate all streams
IEventStoreConnection conn = EventStoreConnection.Create(connection);
await Task.Run(() => conn.ConnectAsync());
try
{
await conn.CreatePersistentSubscriptionAsync(stream, group,
PersistentSubscriptionSettings.Create(), null);
}
catch
{
}
dynamic ps = conn.ConnectToPersistentSubscription(stream, group,
(s, e) => Process(s, e),
(s, r, ex) => HandleException(s, r, ex),
null,
2,
false);
Console.ReadKey();
}
public void Connect()
{
_eventStoreConnection.ConnectAsync().Wait();
CreatePersistentSubscription(_eventStoreConnection);
EventStorePersistentSubscriptionBase = _eventStoreConnection.ConnectToPersistentSubscription(StreamName,
GroupName, EventAppeared, SubscriptionDropped, _userCredentials);
}
public void ConnectToSubscription()
{
var bufferSize = 10;
var autoAck = true;
_subscription = _conn.ConnectToPersistentSubscription(_stream, _group, EventAppeared, SubscriptionDropped,
User, bufferSize, autoAck);
}
private void ConnectToSubscription()
{
var bufferSize = 10;
var autoAck = true;
_subscription = _conn.ConnectToPersistentSubscription(STREAM, GROUP, EventAppeared, SubscriptionDropped,
User, bufferSize, autoAck);
}
private void ConnectToSubscription()
{
var bufferSize = 10;
var autoAck = true;
_subscription = _conn.ConnectToPersistentSubscription(STREAM, GROUP,
(Action <EventStorePersistentSubscriptionBase, ResolvedEvent>)EventAppeared,
SubscriptionDropped,
User, bufferSize, autoAck);
}
public void Connect()
{
var streamName = $"$ce-{typeof(T).Name}";
EventStorePersistentSubscriptionBase = _eventStoreConnection.ConnectToPersistentSubscription(
streamName,
_groupName,
EventAppeared,
SubscriptionDropped
);
}
private void ConnectToSubscription()
{
var bufferSize = 10;
var autoAck = true;
Console.WriteLine("**** Connecting to subscription ...");
_subscription = _conn.ConnectToPersistentSubscription(STREAM, GROUP,
(_base, _event) => { EventAppeared(_base, _event); },
(_base, _reason, _exception) => { SubscriptionDropped(_base, _reason, _exception); },
User, bufferSize, autoAck);
}
public void Start()
{
Console.WriteLine("Start service");
CreateESConnection();
PrepareDictionary();
_connectionES.ConnectToPersistentSubscription(
"picture_stream",
"PictureScan",
(_, x) => DoSomething(_, x),
(sub, reason, ex) => { },
_connectionES.Settings.DefaultUserCredentials);
}
protected override async Task Given()
{
_conn = EventStoreConnection.Create(_node.TcpEndPoint);
await _conn.ConnectAsync();
await _conn.CreatePersistentSubscriptionAsync(_streamName, _groupName, _settings,
DefaultData.AdminCredentials);
_sub1 = _conn.ConnectToPersistentSubscription(_streamName, _groupName,
(subscription, @event) => {
Console.WriteLine();
return(Task.CompletedTask);
},
(subscription, reason, arg3) => Console.WriteLine(), DefaultData.AdminCredentials);
_sub2 = _conn.ConnectToPersistentSubscription(_streamName, _groupName,
(subscription, @event) => {
Console.WriteLine();
return(Task.CompletedTask);
},
(subscription, reason, arg3) => Console.WriteLine(),
DefaultData.AdminCredentials);
}
public static void ConnectToPersistentSubscription(
string chatRoom,
string groupName,
Action <ChatMessage> onRecieved)
{
Connection.CreatePersistentSubscriptionAsync(
chatRoom,
groupName,
PersistentSubscriptionSettings.Create().StartFromBeginning().Build(),
_userCredentials);
Connection.ConnectToPersistentSubscription(
groupName,
chatRoom,
OnRecievedPersistent(onRecieved));
}
private void ConnectToSubscription(Projection projection)
{
var bufferSize = 10;
var autoAck = true;
var subscription = eventStoreConnection.ConnectToPersistentSubscription(
projection.ToString(),
Group,
EventAppeared(projection),
SubscriptionDropped(projection),
userCredentials,
bufferSize,
autoAck);
eventStorePersistentSubscriptionBases.Add(subscription);
}
/// <summary>
/// Subscribes to a persistent subscription(competing consumer) on event store
/// </summary>
/// <param name="target">The connection to subscribe to</param>
/// <param name="groupName">The subscription group to connect to</param>
/// <param name="stream">The stream to subscribe to</param>
/// <param name="eventAppeared">An action invoked when a new event is received over the subscription</param>
/// <param name="subscriptionDropped">An action invoked if the subscription is dropped</param>
/// <param name="userCredentials">User credentials to use for the operation</param>
/// <param name="bufferSize">The buffer size to use for the persistent subscription</param>
/// <param name="autoAck">Whether the subscription should automatically acknowledge messages processed.
/// If not set the receiver is required to explicitly acknowledge messages through the subscription.</param>
/// <remarks>This will connect you to a persistent subscription group for a stream. The subscription group
/// must first be created with CreatePersistentSubscriptionAsync many connections
/// can connect to the same group and they will be treated as competing consumers within the group.
/// If one connection dies work will be balanced across the rest of the consumers in the group. If
/// you attempt to connect to a group that does not exist you will be given an exception.
/// </remarks>
/// <returns>An <see cref="EventStorePersistentSubscriptionBase"/> representing the subscription</returns>
public static EventStorePersistentSubscriptionBase ConnectToPersistentSubscription(
this IEventStoreConnection target,
string stream,
string groupName,
Action <EventStorePersistentSubscriptionBase, ResolvedEvent> eventAppeared,
Action <EventStorePersistentSubscriptionBase, SubscriptionDropReason, Exception> subscriptionDropped = null,
UserCredentials userCredentials = null,
int bufferSize = 10,
bool autoAck = true) =>
target.ConnectToPersistentSubscription(
stream,
groupName,
ToTask(eventAppeared),
subscriptionDropped,
userCredentials,
bufferSize,
autoAck
);
private async Task SubscribeProcessManager(AppFunc chain, IManageProcess currentProcessManager, IDictionary <string, object> environment)
{
environment.Log("Subscribing processmanager: {0}", LogLevel.Debug, currentProcessManager.ProcessName);
while (true)
{
if (!running)
{
return;
}
if (_processManagerSubscriptions.ContainsKey(currentProcessManager.ProcessName))
{
_processManagerSubscriptions[currentProcessManager.ProcessName].Close();
_processManagerSubscriptions.Remove(currentProcessManager.ProcessName);
}
try
{
var eventStoreSubscription = _eventStoreConnection.ConnectToPersistentSubscription(currentProcessManager.ProcessName, currentProcessManager.ProcessName,
async(subscription, evnt) => await PushEventToProcessManager(chain, currentProcessManager, _eventSerialization.DeSerialize(evnt), environment, subscription).ConfigureAwait(false),
async(subscription, reason, exception) => await SubscriptionDropped(chain, currentProcessManager, reason, exception, environment).ConfigureAwait(false),
autoAck: false);
_processManagerSubscriptions[currentProcessManager.ProcessName] = new ProcessManagerSubscription(eventStoreSubscription);
return;
}
catch (Exception ex)
{
if (!running)
{
return;
}
environment.Log(ex, "Couldn't subscribe processmanager: {0}. Retrying in 5 seconds.", LogLevel.Error, currentProcessManager.ProcessName);
await Task.Delay(TimeSpan.FromSeconds(5)).ConfigureAwait(false);
}
}
}
static void InventaryManager(IEventStoreConnection conn, string streamName, UserCredentials userCredentials)
{
//Existing events
var streamEvents = conn.ReadStreamEventsForwardAsync(streamName, 0, 10, true, userCredentials).Result;
foreach (var evt in streamEvents.Events)
{
var json = Encoding.UTF8.GetString(evt.Event.Data);
dynamic sales = JsonConvert.DeserializeObject(json);
Console.WriteLine("Product : {0}, Quantity : {1}", sales.ProductName,
sales.Quantity);
}
//Listening for new events
Console.WriteLine("\nListening for new sales...\n");
conn.ConnectToPersistentSubscription(streamName, "inventaryManager", (_, x) => {
var data = Encoding.ASCII.GetString(x.Event.Data);
dynamic sales = JsonConvert.DeserializeObject(data);
Console.WriteLine("New\tProduct : {0}, Quantity : {1}", sales.ProductName,
sales.Quantity);
}, (sub, reason, ex) => { }, userCredentials);
}
protected override void Given()
{
_conn = EventStoreConnection.Create(_node.TcpEndPoint.ToESTcpUri());
_conn.ConnectAsync().Wait();
_conn.CreatePersistentSubscriptionAsync(_streamName, _groupName, _settings,
DefaultData.AdminCredentials).Wait();
_sub1 = _conn.ConnectToPersistentSubscription(_streamName,_groupName,
(subscription, @event) => Console.WriteLine(),
(subscription, reason, arg3) => Console.WriteLine());
_sub2 = _conn.ConnectToPersistentSubscription(_streamName, _groupName,
(subscription, @event) => Console.WriteLine(),
(subscription, reason, arg3) => Console.WriteLine(),
DefaultData.AdminCredentials);
}
public void Initialize()
{
_connection.ConnectToPersistentSubscription(_subscription.StreamName, _subscription.GroupName, OnEventAppeared);
}
private void SubscribePersisten()
{
_conn.ConnectToPersistentSubscription(_streamName, "transactionReadModelWriter", GotEvent,
subscriptionDropped: Dropped, autoAck: true);
}
private async Task SubscribeService(AppFunc chain, string stream, bool liveOnlySubscriptions, string subscriptionKey, IDictionary <string, object> environment)
{
environment.Log("Subscribing to stream: {0}", LogLevel.Debug, stream);
while (true)
{
if (!running)
{
return;
}
try
{
if (_serviceSubscriptions.ContainsKey(subscriptionKey))
{
_serviceSubscriptions[subscriptionKey].Close();
_serviceSubscriptions.Remove(subscriptionKey);
}
if (liveOnlySubscriptions)
{
//TODO:Handle retries on error
var eventstoreSubscription = await _eventStoreConnection.SubscribeToStreamAsync(stream, true,
async (subscription, evnt) => await PushEventToService(chain, stream, _eventSerialization.DeSerialize(evnt), false, environment,
x => environment.Log("Successfully handled event: {0} on stream: {1}", LogLevel.Debug, x.EventId, stream),
(x, exception) => environment.Log(exception, "Failed handling event: {0} on stream: {1}", LogLevel.Error, x.EventId, stream)).ConfigureAwait(false),
async (subscription, reason, exception) => await SubscriptionDropped(chain, stream, true, subscriptionKey, reason, exception, environment).ConfigureAwait(false)).ConfigureAwait(false);
_serviceSubscriptions[subscriptionKey] = new LiveOnlyServiceSubscription(eventstoreSubscription);
}
else
{
var eventstoreSubscription = _eventStoreConnection.ConnectToPersistentSubscription(stream, subscriptionKey,
async(subscription, evnt) => await PushEventToService(chain, stream, _eventSerialization.DeSerialize(evnt), true, environment,
x =>
{
environment.Log("Successfully handled event: {0} on stream: {1}", LogLevel.Debug, x.EventId, stream);
subscription.Acknowledge(x.OriginalEvent);
}, (x, exception) =>
{
environment.Log(exception, "Failed handling event: {0} on stream: {1}", LogLevel.Error, x.EventId, stream);
subscription.Fail(x.OriginalEvent, PersistentSubscriptionNakEventAction.Unknown, exception.Message);
}).ConfigureAwait(false), async(subscription, reason, exception) => await SubscriptionDropped(chain, stream, false, subscriptionKey, reason, exception, environment).ConfigureAwait(false), autoAck: false);
_serviceSubscriptions[subscriptionKey] = new PersistentServiceSubscription(eventstoreSubscription);
}
return;
}
catch (Exception ex)
{
if (!running)
{
return;
}
environment.Log(ex, "Couldn't subscribe to stream: {0}. Retrying in 5 seconds.", LogLevel.Warn, stream);
await Task.Delay(TimeSpan.FromSeconds(5)).ConfigureAwait(false);
}
}
}
