Lean and Easy IoT Applications with OSGi and Eclipse Concierge

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Lean and Easy IoT Applications with OSGi and Eclipse Concierge

Jan S. Rellermeyer, IBM Research

#eclipseIoT @rellermeyer

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THE INFORMATION CONTAINED IN THIS PRESENTATION IS PROVIDED FOR INFORMATIONAL PURPOSES ONLY.

WHILST EFFORTS WERE MADE TO VERIFY THE COMPLETENESS AND ACCURACY OF THE INFORMATION CONTAINED IN THIS PRESENTATION, IT IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED.

ALL PERFORMANCE DATA INCLUDED IN THIS PRESENTATION HAVE BEEN GATHERED IN A CONTROLLED ENVIRONMENT. YOUR OWN TEST RESULTS MAY VARY BASED ON HARDWARE, SOFTWARE OR INFRASTRUCTURE DIFFERENCES.

ALL DATA INCLUDED IN THIS PRESENTATION ARE MEANT TO BE USED ONLY AS A GUIDE.

IN ADDITION, THE INFORMATION CONTAINED IN THIS PRESENTATION IS BASED ON IBM’S CURRENT PRODUCT PLANS AND STRATEGY, WHICH ARE SUBJECT TO CHANGE BY IBM, WITHOUT NOTICE.

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- CREATING ANY WARRANT OR REPRESENTATION FROM IBM, ITS AFFILIATED COMPANIES OR ITS OR THEIR SUPPLIERS AND/OR LICENSORS

Important Disclaimers


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Software Lifecycle Management


Module A

Module B

Module C

Module D

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OSGi Module LayerModules are called Bundles• JAR files with additional metadata

Runtime system: The Framework• Lifecycle management

Bundles implement isolation and locality• Interaction between bundles is limited

• Shared code through package imports

• Every bundle is loaded through a separate classloader

Monitoring system state through events


Module

Module Module

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OSGi Framework

OSGi Framework

Bundle A

Package 1Package 2Package 3

Bundle B

Package IPackage II

Exported Package Exported Package

Private Package

Import

Export-Package: Package 1 Export-Package: Package I, Package II

Import-Package: Package 1


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OSGi Service LayerModules allow for a compositional approach to building applications

But: Package dependencies are explicit.

Limits the modularity!

Solution: Services

Idea: Separate the interface from the implementation

Module

Module Module

Interface

Implementation

Service Service


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OSGi for IoTIoT systems are often dynamic

•Sensors and actuators might not always be available

•N:M relationship between producers and consumers

Event Source

Event Listener

Servicegets registers

receives service life-cycle events

Service Registry


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Eclipse ConciergeFull OSGi core R5 compatibility• Goal achieved

Keep a small footprint to work well on embedded devices • 250kiB without debug symbols

• 330kiB with debug symbols

Remain “readable”

• Currently 9 classes

Remain backwards-compatible• Java 5


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Building IoT Applications• Concierge supports Knopflerfish-style xargs file for startup• Enhanced property (variable replacement) and install notation (wildcard support)• Supports start level in scripts (-level <n>)


$ java -jar framework/org.eclipse.concierge-5.0.0.*.jar samples/demo.xargs

# demo.xargs-Dorg.osgi.framework.system.packages.extra+=javax.xml.parsers# -Drepo=http://www.us.apache.org/dist/felix-Drepo=localRepo

# load bundles, use wildcard notation for local files, not for URLs-istart bundles/org.eclipse.concierge.shell-5.0.0.*.jar-istart bundles/org.eclipse.concierge.service.startlevel-5.0.0.*.jar-istart bundles/org.eclipse.concierge.service.packageadmin-5.0.0.*.jar-istart ${repo}/org.apache.felix.httplite.complete-0.1.4.jar-istart ${repo}/org.apache.felix.webconsole-4.2.14-all.jar

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Remote Management• RESTful interface

• Exposing the framework and its internal state as resources

• Bundles

• Services

• Easy management of OSGi deployments through REST

• Command line tools

• Web interfaces

• Application-level


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Use Case: Eclipse SmartHome


+openHAB2 smarthome-concierge

Distribution 160 MB 19 MB

OSGi (no Karaf) 3.1 MB 1.6 MB

EMF/xText 7 MB 0 MB

Java Runtime 32 MB 16 MB (compact3)12 MB (compact2)

Memory footprint ~32 MB ~15 MB

Startup time ~40 sec ~30 sec

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Use Case: iMinds IoT Lab


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Use Case: OSGi enRoute

OSGi enRoute uses OSGi R6 and bndtools

• R6 implementation of Concierge available as a snapshot

• OSGi repository hosted at the Concierge website


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ExperimentsBeaglebone Rev A5•AM335x 720MHz ARM Cortex-A8•256 MiB DDR2 RAM•4 GiB microSD card •Angstrom Linux•Java SE Embedded 1.7.0_21-b11 and•Java SE Embedded build 1.8.0_06-b23 compact1

Image: http://beaglebone.org

Raspberry Pi B

•ARM1176JZF-S 700 MHz ARM 11•512 MiB SDRAM (shared with GPU)•8 GiB SDHD card•Raspbian Linux•Java SE build 1.8.0-b132


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Experiments

Eclipse Equinox

• version 3.11.2.v20161107-1947

• 1.3 MiB

• (R6 framework)

Apache Felix

• version 5.6.2

• 697 kiB

Knopflerfish

• version 7.2.0

• 609kiB / 320kiB compact

Concierge

• version 5.1.0 SNAPSHOT

• 248kiB

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Performance – Startup Time


0

2

4

6

8

10

12

14

16

18

20

Beagleboneejre7 Beagleboneejre8 RaspberryPi

time(s)

VM

Concierge

Equinox

Felix

Knopflerfish

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Performance – Service RegistryStress test

Register 10000 services

• Each one has a random value for the same key

• Range: byte => collisions

Perform 1000 lookups (getServiceReferences) for a random value

• Range: byte

Unregister the 10000 services

Registry


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Performance – Service Registry

0

2000

4000

6000

8000

10000

12000

14000

16000


time(m

s)

ServiceRegistration

Concierge

Equinox

Felix

Knopflerfish


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0

100000

200000

300000

400000

500000

600000

700000


time(m

s)

ServiceLookup

Concierge

Equinox

Felix

Knopflerfish


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0

1000

2000

3000

4000

5000

6000


time(m

s)

ServiceUnregistration

Concierge

Equinox

Felix

Knopflerfish


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Performance – ResolverGenerate 1000 “random bundles”

• Can either import or export up to 5 packages

• Choice of 50 packages in total

• For exports: generate a random package version from [1.0.0-21.0.0)

• For import: generate a random import range from the interval.

Install all 1000 bundles

Resolve the bundles

Benchmark turned out to be rather volatile…


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Performance - Resolver


0

20000

40000

60000

80000

100000

120000


time(ms)

Installation

Concierge

Equinox

Felix

Knopflerfish

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Performance - Resolver

0

10000

20000

30000

40000

50000

60000


time(ms)

Resolving

Concierge

Equinox

Felix

Knopflerfish


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Eclipse Concierge

Concierge is an OSGi frameworkoptimized for embedded devicesand the Internet of Things


http://eclipse.org/concierge

Project Homepage

https://github.com/eclipse/concierge

Clone it from here It’s simplicity and usability can help

you with developing complex IoTapplications with ease.

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Lean and Easy IoT Applications with OSGi and Eclipse Concierge

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