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If an event is published to a topic
and no one is around to consume it,
does it make a sound?
Bernd Ruecker
Co-Founder and Chief Technologist of Camunda
@berndruecker
Warning:
This talk might contain nonsense
@berndruecker
People that understand
functional programming
The others
@berndruecker
SELECT name
FROM people
WHERE city = `Berlin´
reader = new BufferedReader(new FileReader("people.txt"));
while ((row = reader.readLine()) != null) {
String[] data = row.split(",");
if ("Berlin".equals(data[3])) { // city
System.out.println(data[1]); // name
}
}
reader.close();
@berndruecker
Declarative
Thinking
Imperative
Thinking
What
Functional
How
@berndruecker
@berndruecker
Functional programming, reactive & streaming = the greatest thing since sliced bread!
… the term Event Stream becomes widely
adopted and promotes a new mental model
of how the systems are implemented.
… the main abstraction in use is a
composition of [stateless] functions
performing transformation on immutable
events. The output of an overall system can
be modeled as the application of those
composed functions on the input stream.
https://medium.com/holisticon-consultants/from-stream-to-state-eb1cade5d403
@berndruecker
Functions
Immutable Events
Event Streams
State
Input / Output
…and actions in the real world…
@berndruecker
Connor Riley
#Cisco just offered me a job!
Connor Riley
#Cisco just offered me a job! Now I
have to weigh the utility of a fatty
paycheck against the daily commute to
San Jose and hating the work.
@berndruecker
#Cisco just offered me a job!
Connor Riley
#Cisco just offered me a job! Now I
have to weigh the utility of a fatty
paycheck against the daily commute to
San Jose and hating the work.
Event goes into the stream
Stateless Stream Processor
Filter all tweets
with #cisco
Stateless Stream Processor
Find offensive
tweets
Tim Levad (Cisco employee)
Who is the hiring manager? I’m sure
they would love to know that you will
hate the work. We here at Cisco are
versed in the Web.
Action
Input
Output
→ Job offer revoked
@berndruecker
Replay?
@berndruecker
Replay?
@berndruecker
#Cisco just offered me a job!
Connor Riley
#Cisco just offered me a job! Now I
have to weigh the utility of a fatty
paycheck against the daily commute to
San Jose and hating the work.
Event goes into the stream
Stateless Stream Processor
Filter all tweets
with #cisco
Refine / change logic
Find offensive
tweets
Tim Levad (Cisco employee)
Who is the hiring manager? I’m sure
they would love to know that you will
hate the work. We here at Cisco are
versed in the Web.
Action
Input
Output
@berndruecker
#Cisco just offered me a job!
Connor Riley
#Cisco just offered me a job! Now I
have to weigh the utility of a fatty
paycheck against the daily commute to
San Jose and hating the work.
Event goes into the stream
Stateless Stream Processor
Filter all tweets
with #cisco
Find offensive
tweets
Tim Levad (Cisco employee)
Who is the hiring manager? I’m sure
they would love to know that you will
hate the work. We here at Cisco are
versed in the Web.
Action
Input
Output
@berndruecker
State?
@berndruecker
#Cisco just offered me a job!
Stateless Stream Processor
Filter all tweets
with #cisco
tweets
Filter tweets with
similar content
within 15 minutes
time
Stateful Stream Processor
State is
in the
API!
@berndruecker
#Cisco just offered me a job!
Stateless Stream Processor
Filter all tweets
with #cisco
tweets
Filter tweets from
our top community
members
Stateful Component
(as stateless stream processor)
State is in the
component
@berndruecker
#Cisco just offered me a job!
tweets
Enrich tweet with
personal information
of sender
lookup
Bad, because
- Load on API
- Availability
- Other disadvantages of synchronous remote communication
@berndruecker
#Cisco just offered me a job!
tweets
Person stream
Stateful Stream Processor
Enrich tweet
@berndruecker
#Cisco just offered me a job!
tweets
Stateful Stream Processor
Persons that tweeted
Enrich tweet
Gather personal
info
@berndruecker
#Cisco just offered me a job!
tweets
Stateful Stream Processor
THIS is
workflow logic!
Workflow
engines can
hold state
Enrich tweet
Gather personal
info
@berndruecker
Persons that tweeted
#Cisco just offered me a job!
tweets
Stateful Stream Processor
Workflow
engines can
hold state
Enrich tweet
Gather personal
info
Publish /
subscribe
Mitigates problems of synchronous communication!
@berndruecker
Example
workflowClient.newWorker()
.jobType("person-lookup")
.handler((jobClient, job) -> {
System.out.println("Gather personal information");
jobClient.newCompleteCommand(job.getKey()).send().join();
}).open();
publish / subscribe
@berndruecker
client.newCreateInstanceCommand()
.bpmnProcessId("enrich-tweet")
.variables(...)
.latestVersion()
.send().join();
client.newCreateInstanceCommand() .bpmnProcessId("order-process") .latestVersion() .send() .join();
Or use the Zeebe Kafka Connector
Declarative
Thinking
Imperative
Thinking
Or is it just me?
@berndruecker
Berlin, Germany
http://berndruecker.io/
mail@berndruecker.io
@berndruecker
Bernd Ruecker
Co-founder and
Chief Technologist of
Camunda
Where do we stand now?
State goes into
Stream
Processor API
Component
Workflow Engine*
*helps to implement common patterns in stateful components
@berndruecker
Where do we stand?
State goes into
Stream
Processor API
Component
Workflow Engine
This translation
requires additional
thought!
@berndruecker
Let‘s do another example:
Vehicle Maintenance
ActionInsightsMeasurements
generates Leads to
oil pressure is
80 psi
oil pressure is
critically high
Schedule
maintenance
Call driver to
stop and inspect
…
@berndruecker
ActionInsightsMeasurements
generates Leads to
oil pressure is
80 psi
oil pressure is
critically high
Schedule
maintenance
Kafka Topic
Measures
Kafka Topic
Insights
Camunda Workflow
Maintenance
Stateful
Stream
Processor
@berndruecker
ActionInsightsMeasurements
generates Leads to
oil pressure is
80 psi
oil pressure is
critically high
Schedule
maintenance
Kafka Topic
Measures
Kafka Topic
Insights
Camunda Workflow
Maintenance
Stateful
Stream
Processor
Decision
Custom Connector
with own state
WorkflowsEvent Streams
@berndruecker
Connecting two worlds
Event
ID: 555444333222111
Asset: Bus_4736_Motor
Time: 1593685892
Insight: oil_pressure_critical
CorrelationKey:
Bus_4736_Motor_oil_pressure_critical
Custom
Connector
@berndruecker
Connecting two worlds
Event
ID: 555444333222111
Asset: Bus_4736_Motor
Time: 1593685892
Insight: oil_pressure_critical
CorrelationKey:
Bus_4736_Motor_oil_pressure_critical
Event
ID: 555444333222111
Asset: Bus_4736_Motor
Time: 1593685892
Insight: oil_pressure_critical
CorrelationKey:
Bus_4736_Motor_oil_pressure_critical
Deduplicate
Messages
Custom
Connector
@berndruecker
Connecting two worlds
Event
ID: 555444333222111
Asset: Bus_4736_Motor
Time: 1593685892
Insight: oil_pressure_critical
CorrelationKey:
Bus_4736_Motor_oil_pressure_critical
Event
ID: 666555444333222
Asset: Bus_4736_Motor
Time: 1593611320
Insight: oil_pressure_critical
CorrelationKey:
Bus_4736_Motor_oil_pressure_critical
Semantic
Aggregation
Custom
Connector
@berndruecker
Connecting two worlds
Event
ID: 555444333222111
Asset: Bus_4736_Motor
Time: 1593685892
Insight:
oil_pressure_critical_for_too_long
CorrelationKey:
Bus_4736_Motor_oil_pressure_...
Custom
Connector
Time windowing
is done in
stream processing
@berndruecker
Connecting two worlds
Event
ID: 555444333222111
Asset: Bus_4736_Motor
Time: 1593685892
Insight: oil_pressure_critical
CorrelationKey:
Bus_4736_Motor_oil_pressure_critical
Event
ID: 777666555444333
Asset: Bus_4736_Motor
Time: 1593900001
Insight: oil_pressure_normal
CorrelationKey:
Bus_4736_Motor_oil_pressure_normal
Semantic
Aggregation
STARTNEW
WORKFLOW
STARTOR KEEP
WORKFLOW
CLOSE
WORKFLOW
Custom
Connector
@berndruecker
Workflow
@berndruecker
ActionInsightsMeasurements
generates Leads to
oil pressure is
80 psi
oil pressure is
critically high
Schedule
maintenance
Kafka Topic
Measures
Kafka Topic
Insights
Camunda Workflow
Maintenance
Stateful
Stream
Processor
Decision
WorkflowsEvent Streams
@berndruecker
Custom
Connector
ActionInsightsMeasurements
generates Leads to
Kafka Topic
Measures
Kafka Topic
Insights
Camunda Workflow
Maintenance
Stateful
Stream
Processor
Decision
Custom
Connector
WorkflowsEvent Streams
This regularly changed and
the stream of events was replayed
@berndruecker
Connecting two worldsCustom
Connector
- Deduplication
- Semantic Aggregation
- Start, correlate to or cancel workflow instances
- Handle replays
- …
Streaming
Workflow
@berndruecker
Some details
https://medium.com/holisticon-consultants/from-stream-to-state-eb1cade5d403
Summary
• Streams need to lead to actions outside the control of the
streams architecture (otherwise nothing has really happened)
• Where to handle state is a difficult question
• Streams vs. Workflow might be about declarative vs.
imperative thinking (what does your team understand?)
• But streams and workflows also go hand in hand. Getting
from stream to workflow involves a translation component
@berndruecker
https://blog.bernd-ruecker.com/
zeebe-loves-kafka-d82516030f99
@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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