Обзор возможностей RabbitMQ и AMQP как альтернативы JMS для обмена сообщениями в Java Middleware.

1. Java Messaging with
AMQP and RabbitMQ
или “JMS, давай до-свидания”
1

2. The big picture
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3. 3

4. Async Java World
Servlets 3.0 - async requests Servlets 3.1 - nio
Netty ReactiveX (RxJava)
Vert.xJAX-RSSpring MVC
Play Framework Akka
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5. Messaging Protocols
AMQP
MQTT
STOMP
0-9-1 1-0
JMS
SMTP, POP3, IMAP
XMPP
DDS
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6. Protocols comparison
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7. AMQP facts
Wire Protocol
Родился в 2006 in J.P.Morgan (миллиарды сообщений в
день)
Миссия: интеграция сообщений между платформами
Поддерживается в Apache Camel, Spring Integration, Mule,..
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8. AMQP is the Internet Protocol for Business
Messaging
versions:
1.0 - Now International standard:
ISO/IEC 19464:2014, OASIS (2014)
RabbitMQ supports version 1.0 via plugin
0-10, 0-9-1, 0-9, 0-8
1.0:
Not declaring broker architecture, broker management
commands. Symmetric.
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9. 9

10. Frames
Frame structure:
Sending content:
Content Header:
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11. One Million Messages Per Second on Google
31 nodes, 8 virtual CPUs on each, 248 cores total
(2014, https://blog.pivotal.io/pivotal/products/rabbitmq-hits-one-million-messages-per-second-on-google-
compute-engine
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12. JMS
AMQP
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13. Exchange
Direct Fanout Topic Headers
Types:
Features:
• Durability (survive broker restart)
• Auto-delete (deleted when all queues have finished using it)
Default Exchange
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14. 14

15. 15

16. Topic Exchange
* (star) can substitute for exactly one word.
# (hash) can substitute for zero or more words.
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17. More Exchange Types
• Headers - по заголовкам сообщения “x-
match”=“any”/“all”
• Dead Letter Exchange (для недоставленных
сообщений)
• Constant-Hash (plugin)
• Delayed Exchange ( задержки перед отправкой)
• more …
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18. Queues
• FIFO (soft)
• Durable / in-memory
• Exclusive
• Auto-delete
• Arguments (TTL,…)
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19. Consumers
• Rule: One message goes to one consumer, unless redelivery
happens
• Serial per Channel (thread)
• Pull / Subscribe API
• Send acknowledgements (ack)
• can do “auto-ack” ( hits reliability )
• round robin with optional priorities
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20. 20

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22. Что у кролика внутри
Erlang
• создан в Ericsson для телеком-железа
• functional
• lightweight processes
• good scaling over CPU
• deadlocks-aware design
• communication between network-distributed processes
• Live code upgrade
• Built in Process Monitoring and Control
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23. Concurrency
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24. Spring
@Bean
public ConnectionFactory connectionFactory() {
CachingConnectionFactory cf = new CachingConnectionFactory("localhost");
cf.setUsername("guest");
cf.setPassword("guest");
return cf;
}
@Bean
public AmqpAdmin amqpAdmin() {
return new RabbitAdmin(connectionFactory());
}
@Bean
public RabbitTemplate rabbitTemplate() {
RabbitTemplate template = new RabbitTemplate(connectionFactory());
// Отправлять сюда
template.setRoutingKey(this.helloWorldQueueName);
// Чиать отсюда
template.setQueue(this.helloWorldQueueName);
return template;
}
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25. Spring async consume
@Bean
public SimpleMessageListenerContainer listenerContainer() {
SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();
container.setConnectionFactory(connectionFactory());
container.setQueueNames(this.helloWorldQueueName);
container.setMessageListener(new MessageListenerAdapter(new HelloWorldHandler()));
return container;
}
Sync:
AmqpTemplate amqpTemplate = context.getBean(AmqpTemplate.class);
System.out.println("Received: " + amqpTemplate.receiveAndConvert());
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26. Spring: ListenerContainer
AbstractMessageListenerContainer
private volatile Object messageListener;
private volatile AcknowledgeMode acknowledgeMode = AcknowledgeMode.AUTO;
private MessageConverter messageConverter;
private ErrorHandler errorHandler = new ConditionalRejectingErrorHandler();
…
SimpleMessageListenerContainer
private volatile Executor taskExecutor = new SimpleAsyncTaskExecutor();
private volatile int concurrentConsumers = 1;
private volatile Integer maxConcurrentConsumers;
private volatile boolean exclusive;
private volatile int prefetchCount = DEFAULT_PREFETCH_COUNT; // 1
…
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27. RabbitTemplate
currently, the only implementation of AMQPTemplate
Methods:
send(Message m, …), convertAndSend(Object o , …) …
recieve(): Message, recieveAndConvert(…), recieveAndReply(…) …
sendAndRecieve(…), convertSendAndRecieve(), …
Features:
• Retry and recovery (spring-retry)
• Publisher confirms and returns (ReturnCallback, ConfirmCallback)
• Message PostProcessors - after receive and before publish (zip/unzip, …)
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28. Finally, AMQP vs JMS
JMS
Standard API
Native to Java world
Enterprizzy
AMQP
Truly Cross - platform
Comprehensive Topology
More Tuning (?)

29. Some Readings:
“Understanding the differences between AMQP and JMS”
http://www.wmrichards.com/amqp.pdf
Why Erlang is good for AMQP implementation
https://pubs.vmware.com/vfabric5/index.jsp#com.vmware.vfabric.rabbitmq.2.4/erlang.html
Alvaro Videla’s presentation “RabbitMQ Internal Architecture”
http://www.slideshare.net/old_sound/dissecting-the-rabbit
All About Messaging Protocols. What Are the Differences? by Bryon Moyer
http://www.eejournal.com/archives/articles/20150420-protocols/
Whats wrong with AMQP and how to fix it
http://www.imatix.com/articles:whats-wrong-with-amqp/
Messaging Products performance comparison
https://softwaremill.com/mqperf/

30. Thanks
Sincerely Yours,
Maxim Konovalov
BPC Banking Technologies, Runet Business Systems
https://www.facebook.com/maxim.konovalov.1