Some of my NServiceBus commands will need to track who issued the command and when. I'm very unsure as to the recommended way to implement this:
Should I create a base class MessageBase, add public Dictionary<string, string> Headers;, and implement IMutateOutgoingMessages?
Should it be added to the MessageContext? If so, how do I ensure the Bus adds it before every message (which needs the headers) is sent?
Is it already done and I just don't know how to access it? (It looks like the user is in the raw MSMQ message...)
NServiceBus already gives you the time the message was sent using the "NServiceBus.TimeSent" header.
Use the builtin NServiceBus headers dictionary and skip the MessageBase
Attaching user id is best done in a outgoing message mutator. Just grab the ID from eg the HttpContext and add it as a header.
http://support.nservicebus.com/customer/portal/articles/860492
To get the time (in your handler/saga):
Bus.CurrentMessageContext.TimeSent
Related
I have a subroutine in my Controller
<HttpPost>
Sub Index(Id, varLotsOfData)
'Point B.
'By the time it gets here - all the data has been accepted by server.
What I would like to do it capture the Id of the inbound POST and mark, for example, a database record to say "Id xx is receiving data"
The POST receive can take a long time as there is lots of data.
When execution gets to point B I can mark the record "All data received".
Where can I place this type of "pre-POST completed" code?
I should add - we are receiving the POST data from clients that we do not control - that is, it is most likely a client's server sending the data - not a webbrowser client that we have served up from our webserver.
UPDATE: This is looking more complex than I had imagined.
I'm thinking that a possible solution would be to inspect the worker processes in IIS programatically. Via the IIS Manager you can do this for example - How to use IIS Manager to get Worker Processes (w3wp.exe) details information ?
From your description, you want to display on the client page that the method is executing and you can show also a loading gif, and when the execution completed, you will show a message to the user that the execution is completed.
The answer is simply: use SignalR
here you can find some references
Getting started with signalR 1.x and Mvc4
Creating your first SignalR hub MVC project
Hope this will help you
If I understand your goal correctly, it sounds like HttpRequest.GetBufferlessInputStream might be worth a look. It allows you to begin acting on incoming post data immediately and in "pieces" rather than waiting until the entire post has been received.
An excerpt from Microsoft's documentation:
...provides an alternative to using the InputStream propertywhich waits until the whole request has been received. In contrast, the GetBufferlessInputStream method returns the Stream object immediately. You can use the method to begin processing the entity body before the complete contents of the body have been received and asynchronously read the request entity in chunks. This method can be useful if the request is uploading a large file and you want to begin accessing the file contents before the upload is finished.
So you could grab the beginning of the post, and provided your client-facing page sends the ID towards the beginning of its transmission, you may be able to pull that out. Of course, this would be reading raw byte data which would need to be decoded so you could grab the inbound post's ID. There's also a buffered one that will allow the stream to be read in pieces but will also build a complete request object for processing once it has been completely received.
Create a custom action filter,
Action Filters for executing filtering logic either before or after an action method is called. Action Filters are custom attributes that provide declarative means to add pre-action and post-action behavior to the controller's action methods.
Specifically you'll want to look at the
OnActionExecuted – This method is called after a controller action is executed.
Here are a couple of links:
http://www.infragistics.com/community/blogs/dhananjay_kumar/archive/2016/03/04/how-to-create-a-custom-action-filter-in-asp-net-mvc.aspx
http://www.asp.net/mvc/overview/older-versions-1/controllers-and-routing/understanding-action-filters-vb
Here is a lab, but I think it's C#
http://www.asp.net/mvc/overview/older-versions/hands-on-labs/aspnet-mvc-4-custom-action-filters
I need to discard a message if a specific header is present.
I tried to implement a IMutateTransportMessages and call DoNotContinueDispatchingCurrentMessageToHandlers() method inside MutateIncoming but the message is dispatched to handlers anyway.
I can discard the message using an handler but I don't like it because I need also to specify the handlers' order.
Any solution?
Thanks,
Federico
I don't think this will be possible from a message mutator. After all, this isn't really the kind of activity a message mutator should be doing - it has nothing to do with changing the structure of the message.
I agree with you that it sounds messy to do this in a handler, because you're right - then you are very dependent upon the handler order.
Discarding a message due to the presence (or absence) of a header is an infrastructure concern, and since you are using NServiceBus V5, the best way to customize the infrastructure is by customizing the message handling pipeline.
Here's the relevant documentation that covers creating a behavior and inserting it into the pipeline but here's the short version:
You need to create a behavior that implements IBehavior<IncomingContext>. All of the behaviors together form a behavior chain that progress to the next step by calling next() - an Action present in the implementation) method.
Within the behavior, check for your header. To stop processing the message, just don't call next() and call context.DoNotInvokeAnyMoreHandlers() instead.
Create a class inheriting RegisterStep which, from its constructor, will define where in the pipeline to insert your behavior. You could register it right before the MutateIncomingTransportMessage step.
Create a class implementing INeedInitialization (note that this could be the same as the RegisterStep class) which calls busConfig.Pipeline.Register<TClassThatInheritsRegisterStep>().
Again, that's the short version. Check out the docs for the full story and an example.
Shameless plug: This process is also described in detail in Learning NServiceBus - Second Edition in Chapter 7, with an example.
Can I extend the server-side Java Code in Worklight?
For example, there is a class called JavaScriptIntegrationLibraryImplementation under com.worklight.integration.js. Inside this class, there is a method broadcastNotification and I would like to override this method. Is it possible to do so?
EDIT
The reason is that:
When I make the subscription in client side with option field (e.g. add customType: A), I would like to retrieve a list of devices which have been subscribed to this event source. Base on the option field in deviceSubscrpition, I would like to have some business logic to determine who to send the notification message. For example, I will only submit the message to the user which 'customType=A'.
However, there is no API in Worklight which can retrieve a list of devices which make me to retrieve the list first. Then do the logic in JavaScript and called WL.Server.notifyDevice..
Therefore, I would like to check whether there is any method to retrieve a list of devices (through API / Adapter which connects to DB) which have subscribed to an event source.
Thanks.
This part of Worklight is not extendable. You can try and override this method as you say, but do note this is not supported and we cannot help in this case.
Edit
Now that it is clear what you're trying to achieve... what you are looking for currently not available. I will open a feature request for it and it will get evaluated at some point (if you are a customer of IBM, I suggest to get in touch with your contact...).
My suggestion (somewhat hackish in form): you could perhaps use multiple Event Sources, where each event source represents an iOS version. On the client-side, upon app initialization, you can retrieve the iOS version and use it to register to the correct event source (this would be very generic code to allow re-use). In case a new iOS version is released (you will likely know of this in advance), you simply add this event source to the adapter code and re-deploy the adapter. Users of the new iOS version could still register for notification, because you get the iOS version upon init, and use this information to register to the correct event source...
To reiterate:
The adapter contains: ES_iOS5 ES_iOS6
The client:
fetches iOS version, stores it in some variable.
registers to event source, where event source name is ES_${iOSVersion}
if a new iOS version is released, simply create a new event source and re-deploy
the adapter; the client is already equipped to handle this.
#Red23jordon,
i had similar case, i created a custom table where at the time of subscription, I was saving
user ID and event type in custom table. and when user unsubscribe then i also remove details from custom table.
For sending push to users subscribed to a particular "even type" i look into custom table to get list of user IDs subscribed to particular event type, and then i went into Notification user/device tables and fetching corresponding devices and sending Push.
Hope it may help you.
thanks
I've spend days trying to find a solution the problem i'm going to try to describe, i've googled alot and even looked at the .NET 4 reference source for SendReply and InternalSendReply activity. But until now i'm stuck.
To make the life of our end customers simpler i want to replace the Receive and SendReply activities with custom activites and use bookmarks instead.
I'm implementing a central webservice which can route to a correct workflow instance, that workflow modifies the bookmark value and finaly it creates a new bookmark while returning the modified bookmark value. It's rather complex already with a WorkflowServiceHostFactory which adds Behaviours and Attach a DataContractResolver to the endpoint.
The endpoint is derived from WorkflowHostingEndpoint which resolves a bookmark created in a custom activity (instead of a receive). And i want another activity instead of a sendreply. Those 2 should correlate and the custom sendreply does send a response on the open channel through the endpoint while creating a new bookmark.
The problem is that i didn't find a way yet to access the endpoint responseContext from within my custom send activity. On the other side, at the workflowcreating endpoint side, it seems that i'm not able to be notified whenever the workflow becomes Idle and as well i don't seem to be able to access the WorkflowExtensions from the host. i'm missing something?
A possible solution i've in mind might be not using a WorkflowServiceHost, but then i loose alot of AppFabric functionaly.
The workflowapplication in platform update 1 has some extension methods called RunEpisode with an overload Func called idleEventCallback. There it's possible to hook into the OnIdle and get a workflowextension to get the object to send back as response.
To answer my own question, i ended up in a workaround using the servicebroker functionality of sql server. The SqlDependency class where the workflow listens for the event to be fired whenever the workflow reach the activity that creates a new bookmark in another state.
I want to be able to intercept outgoing email on a specific domain in Exchange Server and modify the headers before it is actually delivered.
Basically, my company has been bought by another and where we were using MDaemon and signing all our emails with DKim and DomainKeys, the new company uses Exchange Server which cannot and will not do this. This appears to be a major oversight I would have thought so I think I will need to do it myself. I have already written a COM component that can sign given message files which I use on my personal mail server using hMailServer, so wanted to do a similar thing for Exchange.
Is this possible, and if so how would you do it?
I have looked but could not find an obvious way of doing this. Some of the things I looked at included:
Transport Agents
Event Sinks
Store Events
Any help would be appreciated. Thanks.
For Exchange 2007 and later: It seems that a TransportAgent is the right way of doing it.
A very basic sample:
public class TestAgent : SmtpReceiveAgent
{
public TestAgent()
{
this.OnEndOfData += new EndOfDataEventHandler(MyEndOfDataHandler);
}
private void MyEndOfDataHandler(ReceiveMessageEventSource source, EndOfDataEventArgs e)
{
// The following line appends text to the subject of the message that caused the event.
e.MailItem.Message.Subject += " - this text appended by MyAgent";
}
}
You can change the actual message via the GetContentWriteStream() and just append or replace existing content.
More samples can be found here.
I know... it's a late answer, but I stumbled over this question and just want to leave some helpful links that I found.
Maybe you can use the Generic Exchange Transport Agent (open source, link goes to GitHub) for this. It provides an abstraction layer above the Exchange transport agent and is specifically designed to handle events for incoming/outgoing email. You can call custom batch scripts to rewrite the whole e-mail, e.g. for adding custom headers and so on.