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https://issues.apache.org/jira/browse/CAMEL-8604?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen resolved CAMEL-8604.
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Resolution: Won't Fix
We do not want to endorse RPC over messaging
> [RabbitMQ] Allow Remote procedure call (RPC) in camel-rabbitmq
> --------------------------------------------------------------
>
> Key: CAMEL-8604
> URL: https://issues.apache.org/jira/browse/CAMEL-8604
> Project: Camel
> Issue Type: Wish
> Components: camel-rabbitmq
> Affects Versions: 2.15.1
> Reporter: Ramon Rosa da Silva
> Priority: Minor
> Original Estimate: 12h
> Remaining Estimate: 12h
>
> I would like RabbitMQ component knew how to handle messages in RPC format
> more easily.
> RabbitMQ RPC Sample: https://www.rabbitmq.com/tutorials/tutorial-six-java.html
> Currently, to receive and reply in RPC is required (as server):
> {code:title=RouteSample.java|borderStyle=solid}
> from("rabbitmq://rabbit-server:5672/myExc?routingKey=myQueue&queue=myQueue&vhost=myVhost&autoAck=false&prefetchEnabled=true&prefetchCount=10&concurrentConsumers=10&declare=true")
> .transacted ()
> .setProperty (RabbitMQConstants.REPLY_TO) .header (RabbitMQConstants.REPLY_TO)
> .to ("sql: ......")
> .setHeader (RabbitMQConstants.ROUTING_KEY) .property
> (RabbitMQConstants.REPLY_TO)
> .setHeader (RabbitMQConstants.EXCHANGE_NAME) .simple ("")
> .to("rabbitmq://rabbit-server:5672/_required_fake_field?routingKey=_required_fake_field&vhost=myVhost&threadPoolSize=1");
> {code}
> So you must save "reply_to" from header to properties, set fake exchange and
> routing key, and overwrite with setHeader.
> Would be simpler:
> - The consumer save the reply_to in properties.
> - Enable exchange and routing key blank.
> - Use reply_to property as routhing key when exchange and key is blank.
> Test unit for improvement:
> {code:title=ProducerTest.java|borderStyle=solid}
> private RabbitMQEndpoint endpoint = Mockito.mock(RabbitMQEndpoint.class);
> private Exchange exchange = Mockito.mock(Exchange.class);
> private Message message = new DefaultMessage();
> private Connection conn = Mockito.mock(Connection.class);
> private Channel channel = Mockito.mock(Channel.class);;
> @Before
> public void before() throws IOException {
> Mockito.when(exchange.getIn()).thenReturn(message);
>
> Mockito.when(endpoint.connect(Matchers.any(ExecutorService.class))).thenReturn(conn);
> Mockito.when(conn.createChannel()).thenReturn(null);
> }
> @Test
> public void testRpcReplyTo() throws Exception {
> message = Mockito.mock(Message.class);
> Mockito.when(exchange.getIn()).thenReturn(message);
> Mockito.when(message.getHeader(RabbitMQConstants.EXCHANGE_NAME,
> String.class)).thenReturn("");
>
> Mockito.when(conn.createChannel()).thenReturn(channel);
> RabbitMQProducer producer = new RabbitMQProducer(endpoint);
> exchange.setFromEndpoint(endpoint);
> exchange.setProperty(RabbitMQConstants.REPLY_TO,
> "queue_to_reply");
>
> producer.process(exchange);
>
> Mockito.verify(channel).basicPublish(Mockito.eq(""),
> Mockito.eq("queue_to_reply"), Mockito.any(BasicProperties.class),
> Mockito.any(byte[].class));
> }
> {code}
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