I am new to the Azure EventHub. I wanted to write a simple prototype which can send and receive messages from AzureEventHub via its rest api.
Could you please help me by providing code snippet demonstrating how to use rest api exposed in EventHub for message producing and consuming.
Sorry, im not sure if there is any java examples around be here are a few links that might help:
Here is a little article that explains how you can generate a SasKey (Shared Access Signature). you to send this key along with every request.
http://www.mikelanzetta.com/2014/09/talking-to-eventhub-from-node/
There is a (unofficial) Azure Service Bus JavaScript SDK, maybe this illustrates how its working
It provides following artefacts:
QueueClient
Topic Client
SubscriptionClient
EventHubClient
Here is an article about sending data to an EventHub: using the javascript sdk.
http://developers.de/blogs/damir_dobric/archive/2015/01/26/eventhubs-support-for-azure-servicebus-javascript-sdk.aspx
I'm the (co-)author of https://github.com/noodlefrenzy/node-amqp10 and can verify that there is no RESTful way to consume messages from an Event Hub - you need to use AMQP. There is a JMS binding for AMQP via Qpid-Proton that you can use.
This article https://azure.microsoft.com/en-gb/documentation/articles/service-bus-java-how-to-use-jms-api-amqp/ has details for using it with Service Bus, but it should be similar for Event Hubs. The main difference with Event Hubs is that messages are never "consumed" and come through on several "partitions", so you would need to connect to all of your partitions, and store the offsets as messages come in so you can specify those when you reconnect.
As per my understanding about EVENTHUB, Rest API has been exposed to send data and there are no rest api available to receive data from event hub.
I tried implementing Receiver for event hub using
1. in Java using https://github.com/hdinsight/eventhubs-client
2. In nodejs using https://github.com/noodlefrenzy/node-amqp10
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I plan to implement the message bus where messages would be produced in .Net Core application but consumer applications are to be running on Android devices and written on Java. In initial approximation publisher application will know nothing about consumers. Java tablets will subscribe to message bus, receive messages and unsubscribe from bus. It looks like I'll need to dynamically create queue for each of the Android tablets, bind it to fanout exchange and send messages to the exchange or something like that. For .Net there is the MassTransit framework that already have all this stuff but I am not aware of Java and Android Studio capabilities. I am curious is there any way or a workaround to implement MassTransit consumer application on Java? I've been googling about 2 hours and didn't find any info but I assume that my search requests were incorrect.
MassTransit uses JSON by default for messages, the structure of which is documented on the web site. You can also send raw JSON messages if the envelope structure used by default is unnecessary.
As for how to consumer RabbitMQ messages from an Android device, I don't have any input there. Surely there is a client SDK.
I have an audit service. other application will call that service for auditing purpose. my concern is all call to audit service to be queued in azure service bus to make sure fault tolerance.please help me with how to queue other service call to audit service.
Now that you already have considered using service bus, there is no concern about fault tolerance. That's the exactly feature of Azure Service Bus.
Let the other services send message to the queues and your audit service receive those messages to consume them in the order.
You could create queues using the Azure portal, PowerShell, CLI, or Resource Manager templates. You then send and receive messages using a QueueClient object.
To quickly learn how to create a queue, then send and receive messages to and from the queue, see the quickstarts for each method. For a more in-depth tutorial on how to use queues, see Get started with Service Bus queues.
For a working sample, see the BasicSendReceiveUsingQueueClient sample on GitHub.
Then if you concern fault tolerance about audit service,you could use ReceiveAndDelete mode. ReceiveAndDelete mode is the simplest model and works best for scenarios in which the application can tolerate not processing a message if a failure occurs.More details, please refer to this link.
i am using createQueueBrowser() of JMS but it is not giving any response, i mean enumerator is null. is there any alternatives for getting bulk message from the azure queue and also are there any ways to traverse the queue without using azure java sdk..
The SDK is just a wrapper around the REST API. You can use that to manage your queue:
https://learn.microsoft.com/en-us/rest/api/storageservices/fileservices/queue-service-rest-api
But I would check if the queue really is empty, before changing over to the REST API from the SDK.
There is a concept azure queue in your description which is not clear for me. I don't know what you said is either Azure Queue Storage or Azure ServiceBus Queue. Based on my understanding, I think azure queue as you said is Azure ServiceBus Queue, not Queue Storage, because only ServiceBus Queue support AMQP via JMS in Java.
For using Service Bus Queue, there are there ways in Java for you.
Using Azure SDK for Java like offical tutorial How to use Service Bus queues said.
Using JMS with AMQP protocol like another offical tutorial How to use the Java Message Service (JMS) API with Service Bus and AMQP 1.0 said.
The last way is using Service Bus Runtime REST based on HTTP protocol if the above two ways are not you want.
I'm trying to implement something similar to https://code.msdn.microsoft.com/Brokered-Messaging-Request-0ce8fcaf#content in Java, but can't find functionality from the Service Bus Java SDK to match the QueueClient.AcceptMessageSession used in the example.
So how can I make the client to poll the response queue only for messages that match the expected sessionId? Do I need to create a seperate response queue for each client? Or is it best practise to re-insert non matching messages back to the queue?
I'm using the com.microsoft.azure/azure-servicebus maven package version 0.9.3.
Seems that this feature is not supported in the Java SDK because it uses the service bus REST api instead of the WFC api. Topic/Subscription way might be the only way to implement this with the Java SDK.
More detail: https://github.com/Azure/azure-sdk-for-java/issues/246
#HannuHuhtanen, in my mind, I think the solution is that using two JMS connections to seperately connect two service bus queues for a continuous WebJob as server and clients, please try to refer to the tutorial to know how to use JMS with AMQP for ServiceBus.
I've asked Google and searched through the NServiceBus website and forums, but I can't seem to find any prescriptive guidance on how I would write a Java application to subscribe to a publisher. Does anyone have any such link or experience?
This scenario is not well supported out of the box - you'll need to do some infrastructure munging yourself. In general, look at how the proxy is built, and add some gateway-style HTTP communication in the mix, or expose that with a standard .NET webservice.
You could manually send the subscribe message to the publisher over MSMQ, the publisher would then send any relevant messages to your java subscribers input queue. But you would need to receive those manually also.
I guess you're then committed to using MSMQ as your transport layer for your entire bus also.