This document discusses using the Azure Service Bus Queue API for Scala. It provides an overview of Service Bus fundamentals and queues. It then demonstrates how to configure SAS authentication, send messages to a queue, and receive messages from a queue using the Scala API. Code examples are given to connect to a Service Bus namespace, send brokered messages asynchronously to a queue, and receive messages in a loop with options to delete or lock the messages.

1. Azure Service Bus Queue API
for Scala
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2. Service Bus Fundamentals
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Service Bus provides a multi-tenant service for connecting applications through the
cloud.

3. Service Bus Queue
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4. Service Bus Queue
Brokered Message:
Service bus message infrastructures stores messages in broker (such as queue). This messaging is asyncronous
means producer and consumer doesn’t need to be online all the time.
Receive Message Options:
ReceiveAndDelete – Receiver receives and deletes message after that.
PeakLock: Receiver locks messages before reading it and release locks after reading it.
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5. Scala API for Service Bus Queue
library dependency
"com.microsoft.azure" % "azure-servicebus" % "0.9.7"
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6. Scala API for Service Bus Queue
Configure SAS Authentication and create Service Bus Contract for a namespace and Service Bus SasKey
Input Param: namespace, sasKeyName, sasKey, serviceBusRootUri
Return Type: ServiceBusContract
def configureSASAuthentication (namespace: String, sasKeyName: String, sasKey: String, serviceBusRootUri:
String): ServiceBusContract = {
val config = ServiceBusConfiguration.configureWithSASAuthentication(namespace, sasKeyName, sasKey,
serviceBusRootUri)
val service: ServiceBusContract = ServiceBusService.create(config)
service
}
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7. Scala API for Service Bus Queue (Cont.)
Convert messages into Asynchronous Brokered Message and send messages
to Service Bus Queue
Input param: servicebuscontract, message, queue name
def sendMessagesToQueue(service: ServiceBusContract, messages: Array[String], queue: String): Unit = {
for (i <- 0 to messages.length -1) {
val brokeredMessage: BrokeredMessage = new BrokeredMessage(messages(i))
service.sendQueueMessage(queue,brokeredMessage)
}
}
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8. Scala API for Service Bus Queue (Cont.)
Get Message from Service Bus Queue
Input param: service bus contract, queue name, byte chunk size, ReceiveMessageOptions: ReceiveAndDelete or PeakLock)
Return Type: Array
def receiveMessageFromQueue (service: ServiceBusContract, options: ReceiveMessageOptions, queue: String, byteSize: Int): Array[String] = {
var str: String = ""
var ab = ArrayBuffer[String]()
while (true) {
val resultQM = service.receiveMessage(queue, options)
val message = resultQM.getValue()
if (message != null) {
val b = Array(byteSize.toByte)
var s: String = null
var s1: String = null
var numRead = 0
while (-1 != numRead) {
s = new String(b)
s1 = s.trim()
str = str.concat(s1)
numRead = message.getBody().read(b)
}
ab+= str
}
}
ab.toArray
}
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9. Questions?
Braja Das
bkd_108@yahoo.com
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