Pipes & Filters Architectural Pattern

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Fredrik Kivi

Pipes & Filters Architectural Pattern presented at Jforum #64, Stockholm 2017-04-26

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Pipes & Filters
Architectural
Pattern
Fredrik Kivi

Have you ever end up with a situation
there you doing multiple entity updates
of the status to reﬂect your application
lifecycle?

The Database As Queue
Anti-Pattern
-Mike Hadlow
”When all you have is a hammer,
every problem looks like a nail”

The 
Pipes & Filters  
Architectural Pattern

–Wikipedia Pipeline_(Software)
“A pipeline consists of a chain of processing
elements arranged so that the output of each
element is the input of the next...
The information that ﬂows in these pipelines is
often a stream of records, bytes or bits, and the
elements of a pipeline may be called ﬁlters; this is
also called the pipes and ﬁlters design
pattern.”

-Enterprise Integration Patterns 
(Gregor Hope & Bobby Woolf)
“Use the Pipes and Filters architectural style
to divide a larger processing task into a sequence
of smaller, independent processing steps (ﬁlters)
that are connected by channels (pipes).”

• Collection Pipeline
• Java Stream API
• Chain of Responsibility (CoR)
• Servlet Filter

• 1972-1974 Unix Pipelines, Pipes & Filters
• 1994-1996 Pipes & Filters Architectural Pattern
• PLoP (Pattern Languages of Programs Conf.)
• Papers
• Books

• Pump 
- Component that feeding a pipeline with data
• Filter 
- Component that transforming data
• Sink  
- Component that collects data and terminates a
pipeline

PIPE PROPERTIES
• Connections
• Streams
• Channels
• Represent object status

FILTER PROPERTIES
• Transform
• Component
• Concurrent
• Process
• Independent, parallel, decomposed processing

Akka Actors
• Independent, parallel, decomposed processing
• Fault tolerant
• Scala up and out
• Akka & Apache Camel?
• Not in my taste ;)

• Pumps - Jocote (IBM MQ)
• Pipes - Jocote (RabbitMQ)
• Filters - Akka Actors
• Sinks - LPR
• Scheduling - Akka Scheduler, Quartz
• Enabling/disabling - Akka Cluster Event

Glad
• RabbitMQ cluster
• Object state represented as pipes
• Akka fault tolerance with queue acknowledgement
• Scale up - Akka router
• Scale out - Independent server nodes consuming
the same queues

Sad
• No orchestration
• Hard to follow asynchronous calls as development

Graphviz
• Short for Graph Visualisation Software
• Open source tools initiated by AT&T Labs
Research
• Graphviz consists of a graph description language
named the DOT language

TOOLS
• Eclipse GEF
• www.webgraphviz.com

Pineapple
• Based on experience from KHS
• Akka & Jocote
• Wire up actors from model
• Parsed from DOT ﬁle
• Created by ModelBuilder
• Discovery API (Spring, JSR 330 or your own)
• Pipes & Filters API

Next
• Connection recovery
• Support for
• Ack/nack
• Backout queues (dead letters)
• Using actor selection as url
• Cron scheduling (ConsumeType)
• JMX
• Enabling/disabling ﬁlters, pumps and sinks
• Show model
• Monitor UI

Apache Flink
• Apache Flink 0.10.0 - Nov 2015
• Ugli Jocote 1.6.0.0 - Nov 2015
• Looks good and has momentum

I been thinking of
• A Jocote Flink Connector
• An option for choosing between Jocote 
and Flink in Pineapple
• A Camel-Jocote-Driver

• https://github.com/ugli/jocote
• https://github.com/ugli/pineapple
• fredrik.kivi@ugli.se

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Pipes & Filters Architectural Pattern

1. Pipes & Filters Architectural Pattern Fredrik Kivi

2. About Me

4. Have you ever end up with a situation there you doing multiple entity updates of the status to reﬂect your application lifecycle?

5. The Database As Queue Anti-Pattern -Mike Hadlow ”When all you have is a hammer, every problem looks like a nail”

6. The  Pipes & Filters   Architectural Pattern

7. –Wikipedia Pipeline_(Software) “A pipeline consists of a chain of processing elements arranged so that the output of each element is the input of the next... The information that flows in these pipelines is often a stream of records, bytes or bits, and the elements of a pipeline may be called filters; this is also called the pipes and filters design pattern.”

8. -Enterprise Integration Patterns  (Gregor Hope & Bobby Woolf) “Use the Pipes and Filters architectural style to divide a larger processing task into a sequence of smaller, independent processing steps (ﬁlters) that are connected by channels (pipes).”

10.

11. Related patterns

12. • Collection Pipeline • Java Stream API • Chain of Responsibility (CoR) • Servlet Filter

13. History

14. • 1972-1974 Unix Pipelines, Pipes & Filters • 1994-1996 Pipes & Filters Architectural Pattern • PLoP (Pattern Languages of Programs Conf.) • Papers • Books

15. Terminology

16. • Pump  - Component that feeding a pipeline with data • Filter  - Component that transforming data • Sink   - Component that collects data and terminates a pipeline

17. PIPE PROPERTIES • Connections • Streams • Channels • Represent object status

18. FILTER PROPERTIES • Transform • Component • Concurrent • Process • Independent, parallel, decomposed processing

19. Filter implementation

20. Akka Actors • Independent, parallel, decomposed processing • Fault tolerant • Scala up and out • Akka & Apache Camel? • Not in my taste ;)

21. Pipe implementation

22. JMS Hello World

23.

24.

25. Jocote

26.

27. @Folksam 2012-2016 KHS

28.

29. • Pumps - Jocote (IBM MQ) • Pipes - Jocote (RabbitMQ) • Filters - Akka Actors • Sinks - LPR • Scheduling - Akka Scheduler, Quartz • Enabling/disabling - Akka Cluster Event

30. Retrospective

31. Glad • RabbitMQ cluster • Object state represented as pipes • Akka fault tolerance with queue acknowledgement • Scale up - Akka router • Scale out - Independent server nodes consuming the same queues

32. Sad • No orchestration • Hard to follow asynchronous calls as development

33. What if

34.

35.

36. Graphviz • Short for Graph Visualisation Software • Open source tools initiated by AT&T Labs Research • Graphviz consists of a graph description language named the DOT language

37. TOOLS • Eclipse GEF • www.webgraphviz.com

38. Pineapple • Based on experience from KHS • Akka & Jocote • Wire up actors from model • Parsed from DOT ﬁle • Created by ModelBuilder • Discovery API (Spring, JSR 330 or your own) • Pipes & Filters API

39.

40.

41. D E M O

42. Next • Connection recovery • Support for • Ack/nack • Backout queues (dead letters) • Using actor selection as url • Cron scheduling (ConsumeType) • JMX • Enabling/disabling ﬁlters, pumps and sinks • Show model • Monitor UI

43. Apache Flink • Apache Flink 0.10.0 - Nov 2015 • Ugli Jocote 1.6.0.0 - Nov 2015 • Looks good and has momentum

44. I been thinking of • A Jocote Flink Connector • An option for choosing between Jocote  and Flink in Pineapple • A Camel-Jocote-Driver

45. • https://github.com/ugli/jocote • https://github.com/ugli/pineapple • fredrik.kivi@ugli.se

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