Class ServiceBusSessionReceiverAsyncClient
- All Implemented Interfaces:
AutoCloseable
ServiceBusReceiverAsyncClient
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
and
disableAutoComplete()
are
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. ServiceBusSessionReceiverAsyncClient sessionReceiver = new ServiceBusClientBuilder() .credential(fullyQualifiedNamespace, credential) .sessionReceiver() .disableAutoComplete() .queueName(sessionEnabledQueueName) .buildAsyncClient(); // acceptSession(String) completes successfully with a receiver when "<<my-session-id>>" session is // successfully locked. // `Flux.usingWhen` is used, so we dispose of the receiver resource after `receiveMessages()` and the settlement // operations complete. // `Mono.usingWhen` can also be used if the resource closure returns a single item. Flux<Void> sessionMessages = Flux.usingWhen( sessionReceiver.acceptSession("<<my-session-id>>"), receiver -> { // Receive messages from <<my-session-id>> session. return receiver.receiveMessages().flatMap(message -> { System.out.printf("Received Sequence #: %s. Contents: %s%n", message.getSequenceNumber(), message.getBody()); // Explicitly settle the message using complete, abandon, defer, dead-letter, etc. if (isMessageProcessed) { return receiver.complete(message); } else { return receiver.abandon(message); } }); }, receiver -> Mono.fromRunnable(() -> { // Dispose of resources. receiver.close(); sessionReceiver.close(); })); // When program ends, or you're done receiving all messages, the `subscription` can be disposed of. This code // is non-blocking and kicks off the operation. Disposable subscription = sessionMessages.subscribe( unused -> { }, error -> System.err.print("Error receiving message from session: " + error), () -> System.out.println("Completed receiving from session."));
Sample: Receive messages from the first available session
Use acceptNextSession()
to acquire the lock of the next available session without specifying the session
id.
TokenCredential credential = new DefaultAzureCredentialBuilder().build(); // 'fullyQualifiedNamespace' will look similar to "{your-namespace}.servicebus.windows.net" // 'disableAutoComplete' indicates that users will explicitly settle their message. ServiceBusSessionReceiverAsyncClient sessionReceiver = new ServiceBusClientBuilder() .credential(fullyQualifiedNamespace, credential) .sessionReceiver() .disableAutoComplete() .queueName(sessionEnabledQueueName) .buildAsyncClient(); // 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 // completes with a retriable error. Otherwise, a receiver is returned when a lock on the session is acquired. Mono<ServiceBusReceiverAsyncClient> receiverMono = sessionReceiver.acceptNextSession(); Flux<Void> receiveMessagesFlux = Flux.usingWhen(receiverMono, receiver -> receiver.receiveMessages().flatMap(message -> { System.out.println("Received message: " + message.getBody()); // Explicitly settle the message via complete, abandon, defer, dead-letter, etc. if (isMessageProcessed) { return receiver.complete(message); } else { return receiver.abandon(message); } }), receiver -> Mono.fromRunnable(() -> { // Dispose of the receiver and sessionReceiver when done receiving messages. receiver.close(); sessionReceiver.close(); })); // This is a non-blocking call that moves onto the next line of code after setting up and starting the receive // operation. Customers can keep a reference to `subscription` and dispose of it when they want to stop // receiving messages. Disposable subscription = receiveMessagesFlux.subscribe(unused -> { }, error -> System.out.println("Error occurred: " + error), () -> System.out.println("Receiving complete."));
- See Also:
-
Method Summary
Modifier and TypeMethodDescriptionAcquires a session lock for the next available session and creates aServiceBusReceiverAsyncClient
to receive messages from the session.acceptSession
(String sessionId) Acquires a session lock forsessionId
and create aServiceBusReceiverAsyncClient
to receive messages from the session.void
close()
-
Method Details
-
acceptNextSession
Acquires a session lock for the next available session and creates aServiceBusReceiverAsyncClient
to receive messages from the session. It will wait until a session is available if none is immediately available.- Returns:
- A
ServiceBusReceiverAsyncClient
that is tied to the available session. - Throws:
UnsupportedOperationException
- if the queue or topic subscription is not session-enabled.com.azure.core.amqp.exception.AmqpException
- if the operation times out. The timeout duration is the tryTimeout of when you build this client with theServiceBusClientBuilder.retryOptions(AmqpRetryOptions)
.
-
acceptSession
Acquires a session lock forsessionId
and create aServiceBusReceiverAsyncClient
to receive messages from the session. If the session is already locked by another client, anAmqpException
is thrown.- Parameters:
sessionId
- The session id.- Returns:
- A
ServiceBusReceiverAsyncClient
that is tied to the specified session. - Throws:
NullPointerException
- ifsessionId
is null.IllegalArgumentException
- ifsessionId
is empty.UnsupportedOperationException
- if the queue or topic subscription is not session-enabled.com.azure.core.amqp.exception.AmqpException
- if the lock cannot be acquired.
-
close
public void close()- Specified by:
close
in interfaceAutoCloseable
-