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Let data flow, like an endless
river into your OSGi
application
Mark Hoffmann
Data In Motion Consulting GmbH
1
About Us
● Founded in 2011
● Located in Jena/Thuringia - Germany
● OSGi Contributing Associate Member
● OSGi / MDSD related company
● Consulting, Development, Training
2
What to expect?
● Messaging in OSGi
● PushStream short introduction
● Real-world Showcase:
○ Handling different message protocols using one API
○ Message Pipelines
○ Merging of Pipelines
○ Backpressure example
3
Introduction
● Messaging is important e.g. the IoT world
● Many existing protocols and frameworks
○ MQTT
○ Websockets
○ XMPP
○ CAN
○ CoAP
● Different devices, different protocols
● Devices define the speed the messages arrive
4
Messaging in OSGi
● EventAdmin
○ Basic spec in OSGi Enterprise
○ sync and async
○ Whiteboard based
● MQTT Adapter RFC 229
○ MQTT specific
○ uses PushStream
5
PushStreams
● New in OSGi Enterprise R7
● Similar to Java Streams but Push-based
● Fluent API using OSGi Promises
● Can be used outside the OSGi world
● Merge of streams
● Back-Pressure Handling
● Coalescing and Windowing (Batching)
6
Message Adapter
● Abstraction of MQTT Adapter
● Implementation supporting MQTT (Paho)
● Implementation supporting Websockets (Jetty)
● Connection to the outside world
● EventAdmin bridge (outside to inside)
7
Showcase
Lets Rock
8
Thanks for listening!
Resources:
Web: https://www.datainmotion.de
Git: https://gitlab.com/datainmotion_opensource/ECE2017_MessagingAdapter
9
Questions?
10

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Let data flow, like an endless river into your OSGi application - M Hoffmann

  • 1. Let data flow, like an endless river into your OSGi application Mark Hoffmann Data In Motion Consulting GmbH 1
  • 2. About Us ● Founded in 2011 ● Located in Jena/Thuringia - Germany ● OSGi Contributing Associate Member ● OSGi / MDSD related company ● Consulting, Development, Training 2
  • 3. What to expect? ● Messaging in OSGi ● PushStream short introduction ● Real-world Showcase: ○ Handling different message protocols using one API ○ Message Pipelines ○ Merging of Pipelines ○ Backpressure example 3
  • 4. Introduction ● Messaging is important e.g. the IoT world ● Many existing protocols and frameworks ○ MQTT ○ Websockets ○ XMPP ○ CAN ○ CoAP ● Different devices, different protocols ● Devices define the speed the messages arrive 4
  • 5. Messaging in OSGi ● EventAdmin ○ Basic spec in OSGi Enterprise ○ sync and async ○ Whiteboard based ● MQTT Adapter RFC 229 ○ MQTT specific ○ uses PushStream 5
  • 6. PushStreams ● New in OSGi Enterprise R7 ● Similar to Java Streams but Push-based ● Fluent API using OSGi Promises ● Can be used outside the OSGi world ● Merge of streams ● Back-Pressure Handling ● Coalescing and Windowing (Batching) 6
  • 7. Message Adapter ● Abstraction of MQTT Adapter ● Implementation supporting MQTT (Paho) ● Implementation supporting Websockets (Jetty) ● Connection to the outside world ● EventAdmin bridge (outside to inside) 7
  • 9. Thanks for listening! Resources: Web: https://www.datainmotion.de Git: https://gitlab.com/datainmotion_opensource/ECE2017_MessagingAdapter 9