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Complex event flows in
distributed systems
@berndruecker
3 common hypotheses I check today:
# Events decrease coupling
# Orchestration needs to be avoided
# Workflow engines are painful
@berndruecker
Warning:
Contains Opinion
Berlin, Germany
mail@berndruecker.io
@berndruecker
Bernd Ruecker
Co-founder and
Chief Technologist of
Camunda
Simplified example:
dash button
Photo by 0xF2, available under Creative Commons BY-ND 2.0
license. https://www.flickr.com/photos/0xf2/29873149904/
@berndruecker
Three steps…
@berndruecker
Who is involved? Some bounded contexts…
Checkout
Payment
Inventory
Shipment
@berndruecker
(Micro-)services
Checkout
Payment
Inventory
Shipment
@berndruecker
Autonomous (micro-)services
Checkout
Payment
Inventory
Shipment
Dedicated Application Processes
Dedicated infrastructure
Dedicated Development Teams
@berndruecker
Events decrease coupling
@berndruecker
Example
Checkout
Payment
Inventory
Shipment
The button blinks if we can
ship within 24 hours
@berndruecker
Request/response: temporal coupling
Checkout
Payment
Inventory
Shipment
Request
Response
The button blinks if we can
ship within 24 hours
@berndruecker
Temporal decoupling with events and read models
Checkout
Payment
Inventory
Shipment
Good
Stored
Read
Model
Good
Fetched
The button blinks if we can
ship within 24 hours
*Events are facts about what happened (in the past)
@berndruecker
Order
Placed
Payment
Received
Goods
Fetched
Notification
Checkout
Payment
Inventory
Shipment
Event-driven architecture
@berndruecker
Events can decrease coupling*
*e.g. decentral data-management, read models,
extract cross-cutting aspects
@berndruecker
Peer-to-peer event chains
Checkout
Payment
Inventory
Shipment
Order
placed
Payment
received
Goods
shipped
Goods
fetched
@berndruecker
Peer-to-peer event chains
Checkout
Payment
Inventory
Shipment
Order
placed
Payment
received
Goods
shipped
Goods
fetched
@berndruecker
The danger is that it's very easy to make
nicely decoupled systems with event
notification, without realizing that you're
losing sight of that larger-scale flow, and
thus set yourself up for trouble in future
years.
https://martinfowler.com/articles/201701-event-driven.html
@berndruecker
The danger is that it's very easy to make
nicely decoupled systems with event
notification, without realizing that you're
losing sight of that larger-scale flow, and
thus set yourself up for trouble in future
years.
https://martinfowler.com/articles/201701-event-driven.html
@berndruecker
The danger is that it's very easy to make
nicely decoupled systems with event
notification, without realizing that you're
losing sight of that larger-scale flow, and
thus set yourself up for trouble in future
years.
https://martinfowler.com/articles/201701-event-driven.html
@berndruecker
Monitoring Workflows Across Microservices
https://www.infoq.com/articles/monitor-workflow-collaborating-microservices
@berndruecker
Typical approachesDistributed Tracing
Data Lake / Event Monitoring
Process Mining
Process Tracking
@berndruecker
Stefan Tilkov: Microservice Patterns & Antipatterns - MicroXchg 2018
@berndruecker
Peer-to-peer event chains
Checkout
Payment
Inventory
Shipment
Order
placed
Payment
received
Goods
shipped
Goods
fetched
Fetch the goods
before the
payment
@berndruecker
Peer-to-peer event chains
Checkout
Payment
Inventory
Shipment
Fetch the goods
before the
payment
Goods
fetched
Order
placed
Payment
received
Goods
shipped
@berndruecker
Photo by born1945, available under Creative Commons BY 2.0 license.
@berndruecker
What we wanted
Photo by Lijian Zhang, available under Creative Commons SA 2.0 License and Pedobear19 / CC BY-SA 4.0
@berndruecker
„Challenges?“
Source:
Microservices orchestration survey,
July 2018, 354 responses
https://camunda.com/microservices-orchestration-survey-results-2018/
@berndruecker
Order
Extract the end-to-end responsibility
Checkout
Payment
Inventory
Shipment
*Commands have an intent about
what needs to happen in the future
Payment
received
Order
placed
Retrieve
payment
@berndruecker
Order
It is about where to decide about the coupling!
Checkout
Payment
Inventory
Shipment
Order
placed
Retrieve
payment
Order decides
. to listen to the event
. to issue the command
@berndruecker
Order
It is about where to decide about the coupling!
Checkout
Payment
Inventory
Shipment
Order
placed
Retrieve
payment
It can still be messaging!
@berndruecker
Commands help to avoid (complex)
peer-to-peer event chains
@berndruecker
Orchestration needs to be avoided
@berndruecker
Smart ESB-like middleware
Checkout
Payment
Inventory
Shipment
Order
Order
placed
Payment
received
Good
fetched
Good
shipped
@berndruecker
Dumb pipes
Checkout
Payment
Inventory
Shipment
Order
Smart endpoints
and dumb pipes
Martin Fowler
@berndruecker
Danger of god services?
Checkout
Order
A few
smart god services
tell
anemic CRUD services
what to do
Sam Newmann
Payment
Inventory
Shipment
@berndruecker
Danger of god services?
Checkout
Payment
Inventory
Shipment
Order
A few
smart god services
tell
anemic CRUD services
what to do
Sam Newmann
@berndruecker
A god service is only created
by bad API design!
@berndruecker
Example
Order Payment
Retrieve
Payment
@berndruecker
Example
Order Payment
Credit
Card
Retrieve
Payment
@berndruecker
Example
Order Payment
Credit
Card
Retrieve
Payment
Rejected
@berndruecker
Example
Order Payment
If the credit
card was
rejected, the
customer can
provide new
details
Credit
Card
Retrieve
Payment
Rejected
Rejected
@berndruecker
Example
Order Payment
Client of dumb endpoints easily become a god services.
If the credit
card was
rejected, the
customer can
provide new
details
Credit
Card
Retrieve
Payment
Rejected
Rejected
@berndruecker
Payment
failed
Who is responsible to deal with problems?
Order Payment
If the credit
card was
rejected, the
customer can
provide new
details
Credit
Card
Retrieve
Payment
Rejected
Payment
received
@berndruecker
Payment
failed
Long running services
Order Payment
Credit
Card
Retrieve
Payment
Rejected
Payment
received
Smart endpoints are
potentially long-running
@berndruecker
Persist thing
(Entity, Actor, …)
State machine or
workflow engine
Typical
concerns
DIY = effort,
accidental
complexity
Scheduling, Versioning,
operating, visibility,
scalability, …
Handling
State
@berndruecker
Workflow engines are painful
Complex, proprietary, heavyweight, central, developer adverse, …
@berndruecker
Avoid the wrong tools!
Death by properties panel
Low-code is great!
(You can get rid
of your developers!)
Complex, proprietary, heavyweight, central, developer adverse, …
@berndruecker
Workflow engines,
state machines
It is
relevant
in modern
architectures
@berndruecker
CADENCE
Silicon valley
has recognized
Workflow engines,
state machines
@berndruecker
CADENCE
Workflow engines,
state machines
@berndruecker
public static void main(String[] args) {
ProcessEngine engine = new StandaloneInMemProcessEngineConfiguration()
.buildProcessEngine();
engine.getRepositoryService().createDeployment() //
.addModelInstance("flow.bpmn", Bpmn.createExecutableProcess("flow") //
.startEvent()
.serviceTask("Step1").camundaClass(SysoutDelegate.class)
.serviceTask("Step2").camundaClass(SysoutDelegate.class)
.endEvent()
.done()
).deploy();
engine.getRuntimeService().startProcessInstanceByKey(
"flow", Variables.putValue("city", "New York"));
}
public class SysoutDelegate implements JavaDelegate {
public void execute(DelegateExecution execution) throws Exception {
System.out.println("Hello " + execution.getVariable("city"));
}
}
What do I mean by
„leightweight?“
@berndruecker
public static void main(String[] args) {
ProcessEngine engine = new StandaloneInMemProcessEngineConfiguration()
.buildProcessEngine();
engine.getRepositoryService().createDeployment() //
.addModelInstance("flow.bpmn", Bpmn.createExecutableProcess("flow") //
.startEvent()
.serviceTask("Step1").camundaClass(SysoutDelegate.class)
.serviceTask("Step2").camundaClass(SysoutDelegate.class)
.endEvent()
.done()
).deploy();
engine.getRuntimeService().startProcessInstanceByKey(
"flow", Variables.putValue("city", "New York"));
}
public class SysoutDelegate implements JavaDelegate {
public void execute(DelegateExecution execution) throws Exception {
System.out.println("Hello " + execution.getVariable("city"));
}
}
Build engine
in one line of
code
(using in-
memory H2)
@berndruecker
public static void main(String[] args) {
ProcessEngine engine = new StandaloneInMemProcessEngineConfiguration()
.buildProcessEngine();
engine.getRepositoryService().createDeployment() //
.addModelInstance("flow.bpmn", Bpmn.createExecutableProcess("flow")
.startEvent()
.serviceTask("Step1").camundaClass(SysoutDelegate.class)
.serviceTask("Step2").camundaClass(SysoutDelegate.class)
.endEvent()
.done()
).deploy();
engine.getRuntimeService().startProcessInstanceByKey(
"flow", Variables.putValue("city", "New York"));
}
public class SysoutDelegate implements JavaDelegate {
public void execute(DelegateExecution execution) throws Exception {
System.out.println("Hello " + execution.getVariable("city"));
}
}
Define flow
e.g. in Java
DSL
@berndruecker
public static void main(String[] args) {
ProcessEngine engine = new StandaloneInMemProcessEngineConfiguration()
.buildProcessEngine();
engine.getRepositoryService().createDeployment() //
.addModelInstance("flow.bpmn", Bpmn.createExecutableProcess("flow")
.startEvent()
.serviceTask("Step1").camundaClass(SysoutDelegate.class)
.serviceTask("Step2").camundaClass(SysoutDelegate.class)
.endEvent()
.done()
).deploy();
engine.getRuntimeService().startProcessInstanceByKey(
"flow", Variables.putValue("city", "New York"));
}
public class SysoutDelegate implements JavaDelegate {
public void execute(DelegateExecution execution) throws Exception {
System.out.println("Hello " + execution.getVariable("city"));
}
}
Define flow
e.g. in Java
DSL
@berndruecker
BPMN
Business Process
Model and Notation
ISO Standard
@berndruecker
public static void main(String[] args) {
ProcessEngine engine = new StandaloneInMemProcessEngineConfiguration()
.buildProcessEngine();
engine.getRepositoryService().createDeployment() //
.addModelInstance("flow.bpmn", Bpmn.createExecutableProcess("flow")
.startEvent()
.serviceTask("Step1").camundaClass(SysoutDelegate.class)
.serviceTask("Step2").camundaClass(SysoutDelegate.class)
.endEvent()
.done()
).deploy();
engine.getRuntimeService().startProcessInstanceByKey(
"flow", Variables.putValue("city", "New York"));
}
public class SysoutDelegate implements JavaDelegate {
public void execute(DelegateExecution execution) throws Exception {
System.out.println("Hello " + execution.getVariable("city"));
}
}
We can attach
code…
@berndruecker
public static void main(String[] args) {
ProcessEngine engine = new StandaloneInMemProcessEngineConfiguration()
.buildProcessEngine();
engine.getRepositoryService().createDeployment() //
.addModelInstance("flow.bpmn", Bpmn.createExecutableProcess("flow")
.startEvent()
.serviceTask("Step1").camundaClass(SysoutDelegate.class)
.serviceTask("Step2").camundaClass(SysoutDelegate.class)
.endEvent()
.done()
).deploy();
engine.getRuntimeService().startProcessInstanceByKey(
"flow", Variables.putValue("city", "New York"));
}
public class SysoutDelegate implements JavaDelegate {
public void execute(DelegateExecution execution) throws Exception {
System.out.println("Hello " + execution.getVariable("city"));
}
}
…that is
called when
workflow
instances pass
through
@berndruecker
public static void main(String[] args) {
ProcessEngine engine = new StandaloneInMemProcessEngineConfiguration()
.buildProcessEngine();
engine.getRepositoryService().createDeployment() //
.addModelInstance("flow.bpmn", Bpmn.createExecutableProcess("flow")
.startEvent()
.serviceTask("Step1").camundaClass(SysoutDelegate.class)
.serviceTask("Step2").camundaClass(SysoutDelegate.class)
.endEvent()
.done()
).deploy();
engine.getRuntimeService().startProcessInstanceByKey(
"flow", Variables.putValue("city", "New York"));
}
public class SysoutDelegate implements JavaDelegate {
public void execute(DelegateExecution execution) throws Exception {
System.out.println("Hello " + execution.getVariable("city"));
}
}
Start
instances
@berndruecker
Payment
Now you have a state machine!
@berndruecker
Payment
Easy to handle time
@berndruecker
Distributed
systems
@berndruecker
Example with synchronous communication
REST
Order Payment
Credit
Card
@berndruecker
Example with synchronous communication
REST
Order Payment
Credit
Card
@berndruecker
Example with synchronous communication
REST
Order Payment
Credit
Card
@berndruecker
Example with synchronous communication
REST
Order Payment
Credit
Card
Stateful
Retry
@berndruecker
Works also for asynchronous communication
Order Payment
Credit
Card
Monitor
Timeouts
@berndruecker
Distributed
systems
@berndruecker
It is impossible to
differentiate certain
failure scenarios:
Independant of
communication style!
Service
Provider
Client
@berndruecker
Distributed systems introduce complexity you have to tackle!
Credit
Card
Payment
REST
@berndruecker
Distributed systems introduce complexity you have to tackle!
Credit
Card
Payment
REST
The service can be
long running.
You get a better API and less gods
@berndruecker
Workflows live inside service boundaries
@berndruecker
No BPM(N) monoliths
https://blog.bernd-ruecker.com/avoiding-the-bpm-monolith-when-using-bounded-contexts-d86be6308d8
@berndruecker
Pat Helland
“
Distributed Systems Guru
Worked at Amazon,
Microsoft & Salesforce
@berndruecker
Pat Helland
Grown-Ups Don’t Use
Distributed Transactions
“
Distributed Systems Guru
Worked at Amazon,
Microsoft & Salesforce
@berndruecker
Distributed transactions using compensation *
Compensation
@berndruecker
Homework:
Try to do this purely event-driven!
Send to: mail@berndruecker.io
@berndruecker
Biz Dev
Leverage
state machine &
workflow engine
Living
documentation
Visibility in
testing
improve
communication
improve
communication
Ops
@berndruecker
Visual HTML reports for test cases
@berndruecker
Living documentation for long-running behaviour
@berndruecker
Proper
Operations
Visibility + Context
@berndruecker
Biz Dev
Leverage
state machine &
workflow engine
Living
documentation
Visibility in
testing
Operate with visibility
and context
Understand and discuss
business processes
Evaluate optimizations
in-sync with
implementation
improve
communication
improve
communication
Ops
@berndruecker
Monitoring Workflows Across Microservices
https://www.infoq.com/articles/monitor-workflow-collaborating-microservices
@berndruecker
Tracking
Checkout Inventory
Payment Shipment
Event Bus
Workflow
Engine
https://www.confluent.io/kafka-summit-sf18/the_big_picture @berndruecker
Journey towards more orchestration
@berndruecker
Vodafone, Liongate & WDW
Presented at CamundaCOn Berlin 2018
Before mapping processes
explicitly with BPMN, the truth was
buried in the code and nobody
knew what was going on.
Jimmy Floyd, 24 Hour Fitnesse
„
@berndruecker
…
It addresses one of the core issues in a distributed
microservices architecture—where is the source of
truth for the coordinated interaction of the
entire system?
…
the system we are replacing uses a complex peer-
to-peer choreography that requires reasoning
across multiple codebases to understand.
https://medium.com/@sitapati/node-js-client-for-zeebe-microservices-orchestration-engine-72287e4c7d94
Josh Wulf
Credit Sense
@berndruecker
Lightweight workflow engines are
great – don‘t DIY*
*e.g. enabling potentially long-running services, solving hard
developer problems, can run decentralized
@berndruecker
Sales-Order & Order-Fulfillment
via Camunda
for every order worldwide
(Q2 2017: 22,2 Mio)
@berndruecker
Code, code, code…
@berndruecker
Event-driven example
InventoryPaymentOrder ShippingCheckout Monitor
https://github.com/berndruecker/flowing-retail/
Human
Tasks
H2 H2
@berndruecker
# Events decrease coupling: sometimes
read-models, but no complex peer-to-peer event chains!
# Orchestration needs to be avoided: sometimes
no ESB, smart endpoints/dumb pipes, balance orchestration and choreography
# Workflow engines are painful: some of them
lightweight engines are easy to use and can run decentralized,
they solve hard developer problems, don‘t DIY
@berndruecker
Thank you!
@berndruecker
mail@berndruecker.io
@berndruecker
https://berndruecker.io
https://medium.com/berndruecker
https://github.com/berndruecker
https://www.infoq.com/articles/events-
workflow-automation
Contact:
Slides:
Blog:
Code:
https://www.infoworld.com/article/3254777/
application-development/
3-common-pitfalls-of-microservices-
integrationand-how-to-avoid-them.html
https://thenewstack.io/5-workflow-automation-
use-cases-you-might-not-have-considered/

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