Package com.azure.messaging.servicebus

Class ServiceBusSessionReceiverClient

java.lang.Object
com.azure.messaging.servicebus.ServiceBusSessionReceiverClient
All Implemented Interfaces:
AutoCloseable
public final class ServiceBusSessionReceiverClient extends Object implements AutoCloseable
This synchronous session receiver client is used to acquire session locks from a queue or topic and create ServiceBusReceiverClient instances that are tied to the locked sessions. Sessions can be used as a first in first out (FIFO) processing of messages. Queues and topics/subscriptions support Service Bus sessions, however, it must be enabled at the time of entity creation.

The examples shown in this document use a credential object named DefaultAzureCredential for authentication, which is appropriate for most scenarios, including local development and production environments. Additionally, we recommend using managed identity for authentication in production environments. You can find more information on different ways of authenticating and their corresponding credential types in the Azure Identity documentation".

Sample: Receive messages from a specific session

Use acceptSession(String) to acquire the lock of a session if you know the session id. ServiceBusReceiveMode.PEEK_LOCK is strongly recommended so users have control over message settlement.

 TokenCredential credential = new DefaultAzureCredentialBuilder().build();

 // 'fullyQualifiedNamespace' will look similar to "{your-namespace}.servicebus.windows.net"
 // 'disableAutoComplete' indicates that users will explicitly settle their message.
 ServiceBusSessionReceiverClient sessionReceiver = new ServiceBusClientBuilder()
     .credential(fullyQualifiedNamespace, credential)
     .sessionReceiver()
     .queueName(sessionEnabledQueueName)
     .disableAutoComplete()
     .buildClient();
 ServiceBusReceiverClient receiver = sessionReceiver.acceptSession("<<my-session-id>>");

 // Keep fetching messages from the session until there are no more messages.
 // The receiveMessage operation returns when either 10 messages have been receiver or, 30 seconds have elapsed.
 boolean hasMoreMessages = true;
 while (hasMoreMessages) {
     IterableStream<ServiceBusReceivedMessage> messages =
         receiver.receiveMessages(10, Duration.ofSeconds(30));
     Iterator<ServiceBusReceivedMessage> iterator = messages.iterator();
     hasMoreMessages = iterator.hasNext();

     while (iterator.hasNext()) {
         ServiceBusReceivedMessage message = iterator.next();
         System.out.printf("Session Id: %s. Contents: %s%n.", message.getSessionId(), message.getBody());

         // Explicitly settle the message using complete, abandon, defer, dead-letter, etc.
         if (isMessageProcessed) {
             receiver.complete(message);
         } else {
             receiver.abandon(message);
         }
     }
 }

 // Use the receiver and finally close it along with the sessionReceiver.
 receiver.close();
 sessionReceiver.close();

Sample: Receive messages from the first available session

Use acceptNextSession() to acquire the lock of the next available session without specifying the session id. ServiceBusReceiveMode.PEEK_LOCK is strongly recommended so users have control over message settlement.

 TokenCredential credential = new DefaultAzureCredentialBuilder().build();

 // 'fullyQualifiedNamespace' will look similar to "{your-namespace}.servicebus.windows.net"
 // 'disableAutoComplete' indicates that users will explicitly settle their message.
 ServiceBusSessionReceiverClient sessionReceiver = new ServiceBusClientBuilder()
     .credential(fullyQualifiedNamespace, credential)
     .sessionReceiver()
     .disableAutoComplete()
     .queueName(sessionEnabledQueueName)
     .buildClient();

 // Creates a client to receive messages from the first available session. It waits until
 // AmqpRetryOptions.getTryTimeout() elapses. If no session is available within that operation timeout, it
 // throws a retriable error. Otherwise, a receiver is returned when a lock on the session is acquired.
 ServiceBusReceiverClient receiver = sessionReceiver.acceptNextSession();

 // Use the receiver and finally close it along with the sessionReceiver.
 try {
     // Keep fetching messages from the session until there are no more messages.
     // The receiveMessage operation returns when either 10 messages have been receiver or, 30 seconds have elapsed.
     boolean hasMoreMessages = true;
     while (hasMoreMessages) {
         IterableStream<ServiceBusReceivedMessage> messages =
             receiver.receiveMessages(10, Duration.ofSeconds(30));
         Iterator<ServiceBusReceivedMessage> iterator = messages.iterator();
         hasMoreMessages = iterator.hasNext();

         while (iterator.hasNext()) {
             ServiceBusReceivedMessage message = iterator.next();
             System.out.printf("Session Id: %s. Message: %s%n.", message.getSessionId(), message.getBody());

             // Explicitly settle the message using complete, abandon, defer, dead-letter, etc.
             if (isMessageProcessed) {
                 receiver.complete(message);
             } else {
                 receiver.abandon(message);
             }
         }
     }
 } finally {
     receiver.close();
     sessionReceiver.close();
 }