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Complex event flows in
distributed systems
@berndruecker With thoughts from http://flowing.io
@berndruecker | @martinschimak
3 common hypotheses I check today:
# Events decrease coupling
# Orchestration needs to be avoided
# Workflow engines are painful
Berlin, Germany
bernd.ruecker@camunda.com
@berndruecker
Bernd Ruecker
Co-founder and
Developer Advocate of
Camunda
O'Reilly SA NYC 2018: Complex event flows in distributed systems
Simplified example:
dash button
Photo by 0xF2, available under Creative Commons BY-ND 2.0
license. https://www.flickr.com/photos/0xf2/29873149904/
Three steps…
Who is involved? Some bounded contexts…
Checkout
Payment
Inventory
Shipment
(Micro-)services
Checkout
Payment
Inventory
Shipment
Autonomous (micro-)services
Checkout
Payment
Inventory
Shipment
Dedicated Application Processes
Dedicated infrastructure
Dedicated Development Teams
Events decrease coupling
Example
Checkout
Payment
Inventory
Shipment
The button blinks if we can
ship within 24 hours
Request/response: temporal coupling
Checkout
Payment
Inventory
Shipment
Request
Response
The button blinks if we can
ship within 24 hours
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)
Events can decrease coupling*
*e.g. decentral data-management, read models,
extract cross-cutting aspects
Peer-to-peer event chains
Checkout
Payment
Inventory
Shipment
Order
placed
Payment
received
Goods
shipped
Goods
fetched
Peer-to-peer event chains
Checkout
Payment
Inventory
Shipment
Order
placed
Payment
received
Goods
shipped
Goods
fetched
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
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
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
Peer-to-peer event chains
Checkout
Payment
Inventory
Shipment
Order
placed
Payment
received
Goods
shipped
Goods
fetched
Fetch the goods
before the
payment
Peer-to-peer event chains
Checkout
Payment
Inventory
Shipment
Fetch the goods
before the
payment
Goods
fetched
Order
placed
Payment
received
Goods
shipped
Peer-to-peer event chains
Checkout
Payment
Inventory
Shipment
Fetch the goods
before the
payment
Customers can
pay via invoice
Goods
fetched
Order
placed
Payment
received
Goods
shipped
…
Photo by born1945, available under Creative Commons BY 2.0 license.
Order
Extract the end-to-end responsibility
Checkout
Payment
Inventory
Shipment
*Commands have an intent about
what needs to happen in the future
Order
placed
Payment
received
Retrieve
payment
Commands help to avoid (complex)
peer-to-peer event chains
Orchestration needs to be avoided
Smart ESB-like middleware
Checkout
Payment
Inventory
Shipment
Order
Order
placed
Payment
received
Good
fetched
Good
shipped
Dumb pipes
Checkout
Payment
Inventory
Shipment
Order
Smart endpoints
and dumb pipes
Martin Fowler
Danger of god services?
Checkout
Order
A few
smart god services
tell
anemic CRUD services
what to do
Sam Newmann
Payment
Inventory
Shipment
Danger of god services?
Checkout
Payment
Inventory
Shipment
Order
A few
smart god services
tell
anemic CRUD services
what to do
Sam Newmann
A god service is only created
by bad API design!
Example
Order Payment
Retrieve
Payment
Example
Order Payment
Credit
Card
Retrieve
Payment
Example
Order Payment
Credit
Card
Retrieve
Payment
Rejected
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
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
Payment
failed
Who is responsible to deal with problems?
Order Payment
Clients of smart endpoints remains lean.
If the credit
card was
rejected, the
customer can
provide new
details
Credit
Card
Retrieve
Payment
Rejected
Payment
received
Smart endpoints are
potentially long-running
Photo by Tookapic, available under Creative Commons CC0 1.0 license.
„There was an error
while sending your
boarding pass“
Check-in
Web-UI
Me
Current situation
Check-in
Barcode
Generator
Web-UI
Me
Output
Mgmt
Current situation
Check-in
Barcode
Generator
Web-UI
Me
Output
Mgmt
Current situation
Check-in
Barcode
Generator
Web-UI
Me
Output
Mgmt
Current situation – the bad part
Check-in
Barcode
Generator
Web-UI
Me
Output
Mgmt
Current situation – the bad part
Stateful
Retry
O'Reilly SA NYC 2018: Complex event flows in distributed systems
We are having some technical
difficulties and cannot present you
your boarding pass right away.
But we do actively retry ourselves, so
lean back, relax and we will send it
on time.
Check-in
Barcode
Generator
Web-UI
Me
Output
Mgmt
Possible situation – much better!
Check-in
Barcode
Generator
Web-UI
Me
Output
Mgmt
Possible situation – much better!
Stateful
Retry
Check-in
Barcode
Generator
Web-UI
Me
Output
Mgmt
Stateful
Retry
Possible situation – much better!
The failure
never leaves
this scope!
Persist thing
(Entity, Actor, …)
State machine or
workflow engine
Typical
concerns
DIY = effort,
accidental
complexity
Scheduling, Versioning,
operating, visibility,
scalability, …
Handling
State
Workflow engines are painful
Complex, proprietary, heavyweight, central, developer adverse, …
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, …
Workflow engines,
state machines
It is
relevant
in modern
architectures
CADENCE
Silicon valley
has recognized
Workflow engines,
state machines
CADENCE
Workflow engines,
state machines
CADENCE
also at scale
Workflow engines,
state machines
CADENCE
for todays demo
Workflow engines,
state machines
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?“
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)
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
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
BPMN
Business Process
Model and Notation
ISO Standard
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…
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
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
Payment
Now you have a state machine!
Payment
Easy to handle time
Stateful retries
Payment
Credit
Card
REST
Fallbacks increase resilience
Payment
Credit
Card
REST
Distributed
systems
It is impossible to
differentiate certain
failure scenarios.
Independant of
communication style!
Service
Provider
Client
Distributed systems introduce complexity you have to tackle!
Credit
Card
Payment
REST
Distributed systems introduce complexity you have to tackle!
Credit
Card
Payment
REST
Distributed
systems
Distributed transaction with compensations*
Living documentation for long-running behaviour
Visual HTML reports for test cases
Proper
Operations
Visibility + Context
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
„
Workflows live inside service boundaries
Explicit flows help separate domain and infrastructure
Infrastructure
Aggregates,
Domain Events,
Domain Services,
etc …
+ the flow
Workflow
Engine
Payment
Application
Domain
Manigfold architecture options
https://blog.bernd-ruecker.com/architecture-options-to-run-a-workflow-engine-6c2419902d91
Manigfold architecture options
https://blog.bernd-ruecker.com/architecture-options-to-run-a-workflow-engine-6c2419902d91
Manigfold architecture options
https://blog.bernd-ruecker.com/architecture-options-to-run-a-workflow-engine-6c2419902d91
Manigfold architecture options
https://blog.bernd-ruecker.com/architecture-options-to-run-a-workflow-engine-6c2419902d91
…
Manigfold architecture options
https://blog.bernd-ruecker.com/architecture-options-to-run-a-workflow-engine-6c2419902d91
Lightweight workflow engines are
great – don‘t DIY*
*e.g. enabling potentially long-running services, solving hard
developer problems, can run decentralized
O'Reilly SA NYC 2018: Complex event flows in distributed systems
Zalando
Sales-Order and
Order-Fulfillment
via Camunda
for every order worldwide
Orders Q2-2017: 22,2 Mio.
Sales 2016: 3,6 Mrd. EUR
Growth 2016: 23%
Code example & live demo
InventoryPaymentOrder ShippingCheckout Monitor
https://github.com/flowing/flowing-retail/
Human
Tasks
H2 H2
# 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, important capabilities need a home
# 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
Thank you!
Meet me at
Meet the experts
Now!
bernd.ruecker@camunda.com
@berndruecker
https://bernd-ruecker.com
https://blog.bernd-ruecker.com
https://github.com/flowing
https://www.infoq.com/articles/
events-workflow-automation With thoughts from http://flowing.io
@berndruecker | @martinschimak
Contact:
Slides:
Blog:
Code:
https://www.infoworld.com/article/3254777/
application-development/
3-common-pitfalls-of-microservices-
integrationand-how-to-avoid-them.html

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O'Reilly SA NYC 2018: Complex event flows in distributed systems