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Why actor-based systems are the best for microservices
Yaroslav Tkachenko
@sap1ens
Director of Engineering, Platform at Bench Accounting
Context
Agenda
• Microservices
• Messaging for microservices
• EIP and messaging
• Actors and messages
• All combined… and more
Microservices
Microservices
Microservices
Service A Service B
HTTP API / RPC
“Easy” way
Microservices
Challenges with HTTP API / RPC:
• Service discovery
• Retries for failures
• Routing and load balancing
• Webhooks
• Tracing
• Versions
• …
Microservices
But…
Messaging for microservices
Messaging for microservices
We should use only messaging for communication between microservices
Messaging for microservices
Reactive Revealed: Resiliency, Failures vs Errors, Isolation, Delegation and Replic
Messaging for microservices
Surviving Micro-services by Richard Rodger
Messaging for microservices
Surviving Micro-services by Richard Rodger
EIP and messaging
EIP and messaging
EIP and messaging
EIP was published in 2003 and it contains 65 patterns
EIP and messaging
Message Channel
Message
Pipes and Filters
Message Router
Message Translator
Message Endpoint
Point-to-Point Channel
Publish-Subscribe Channel
Datatype Channel
Invalid Message Channel
Dead Letter Channel
Guaranteed Delivery
Channel Adapter
Messaging Bridge
Message Bus
Command Message
Document Message
Event Message
Request-Reply
Return Address
Correlation Identifier
Message Sequence
Message Expiration
Format Indicator
Introduction to Message Routing
Content-Based Router
Message Filter
Dynamic Router
Recipient List
Splitter
Aggregator
Resequencer
Composed Message Processor
Scatter-Gather
Routing Slip
Process Manager
Message Broker
Envelope Wrapper
Content Enricher
Content Filter
Claim Check
Normalizer
Canonical Data Model
Messaging Gateway
Messaging Mapper
Transactional Client
Polling Consumer
Event-Driven Consumer
Competing Consumers
Message Dispatcher
Selective Consumer
Durable Subscriber
Idempotent Receiver
Service Activator
Control Bus
Detour
Wire Tap
Message History
Message Store
Smart Proxy
Test Message
Channel Purger
Actors and messages
Actors and messages
So, I convinced you that messaging patterns are great. Right?
Actors and messages
But why actors? I can just use a message queue and a bunch of
consumers/producers
Actors and messages
Sure! But let’s compare
Actors and messages
ActiveMQ message listener in Java
Actors and messages
ActiveMQ message listener in Java (zoom-in)
public class Server implements MessageListener {
// …
public void onMessage(Message message) {
try {
TextMessage response = this.session.createTextMessage();
if (message instanceof TextMessage) {
TextMessage txtMsg = (TextMessage) message;
String messageText = txtMsg.getText();
response.setText(this.messageProtocol.handleProtocolMessage(messageText));
}
response.setJMSCorrelationID(message.getJMSCorrelationID());
this.replyProducer.send(message.getJMSReplyTo(), response);
} catch (JMSException e) {
}
}
// …
}
Actors and messages
Actor-based (Akka) message listener in Scala
class CustomerService extends Actor with ActorLogging with Consumer {
val camel = CamelExtension(system)
camel.context.addComponent("activemq", ActiveMQComponent.activeMQComponent(
“tcp://localhost:61616”
))
def endpointUri = "activemq:topic:events"
def receive = {
case e: CamelMessage => {
sender() ! “SomeMessage”
}
}
}
Actors and messages
Btw, some magic is provided by: Apache Camel
“The most unknown coolest library out there”
JM
Actors and messages
Actors give you:
• Simple and high-level abstractions for distribution, concurrency and parallelism
• Asynchronous, non-blocking and highly performant message-driven programming model
• Very lightweight event-driven processes (several million actors per GB of heap memory)
Actors and messages
All combined… and more
All combined… and more
Summary:
• It’s easy to build microservices from scratch using messaging patterns
• All these patterns are well-known, tested and documented
• Actor model gives very simple abstractions to process and send messages
• Bonus: all kinds of routing models, back-pressure, reliable queues, broadcasts
Q&A
Reading list
http://microservices.io
http://www.enterpriseintegrationpatterns.com/patterns/messaging/
https://www.amazon.ca/Reactive-Messaging-Patterns-Actor-Model/dp/0133846830
https://www.youtube.com/watch?v=0pfghZxlFSg
https://www.youtube.com/watch?v=JvbUF33sKf8
http://akka.io
http://camel.apache.org

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