BeJUG Meetup - What's coming in the OSGi R7 Specification

© 2016 Adobe Systems Incorporated. All Rights Reserved. Adobe Confidential.
OSGi R7 upcoming specifications
David Bosschaert & Carsten Ziegeler | Adobe

Carsten Ziegeler
§ RnD Adobe Research Switzerland
§ Member of the Apache Software Foundation
§ VP of Apache Felix and Sling
§ OSGi Expert Groups and Board member
2

David Bosschaert
§ Adobe R&D Ireland
§ OSGi EEG co-chair
§ Apache member and committer
§ ISO JTC1 SC38 (Cloud Computing) Ireland committee member
3

Converter
and Serialization Service

Object Conversion
§ Wouldn’t you like to convert anything to everything?
§ Peter Kriens’ work in Bnd started it
§ Convert
§ Scalars, Collections, Arrays
§ Interfaces, maps, DTOs, JavaBeans, Annotations
§ Need predictable behaviour – as little implementation freedom as possible
§ Can be customized
RFC 215 – Implementation in Apache Felix (/converter)
5

Sample conversions
§ Examples:
Converter c = Converters.standardConverter();
// Convert scalars
int i = c.convert("123").to(int.class);
UUID id = c.convert("067e6162-3b6f-4ae2-a171-2470b63dff00").to(UUID.class);
List<String> ls = Arrays.asList("978", "142", "-99");
short[] la = c.convert(ls).to(short[].class);
6

Convert configuration data into typed information with defaults
Map<String, String> myMap = new HashMap<>();
myMap.put("refresh", "750");
myMap.put("other", "hello");
// Convert map structures
@interface MyAnnotation {
int refresh() default 500;
String temp() default "/tmp";
}
MyAnnotation myAnn = converter.convert(someMap).to(MyAnnotation.class)
int refresh = myAnn.refresh(); // 750
Strine temp = myAnn.temp(); // "/tmp"
7

Customize your converter
The converter service itself always behaves the same
§ Need customizations? Create a new converter: ConverterBuilder
§ Change default behaviour of array to scalar conversion
§ Convert String[] to String via adapter
// Default behaviour
String s = converter.convert(new String[] {“h”, “i”}).to(String.class); // s = “h”
Converter c = converter.newConverterBuilder()
.rule(String[].class, String.class, MyCnv::saToString, MyCnv::stringToSA)
.build();
String s2 = c.convert(new String[] {“h”, “i”}).to(String.class); // ss=“hi”
8

Config Admin and Configurator

OSGi Configuration Admin
§ Central service for managing configurations
§ CRUD for configurations
§ Query
§ Injection of configurations
10

Configuration Admin Plugins
11
Configuration
Admin
Component
Plugin
Plugin
Plugin
Plugin
Cfg Cfg‘
prop=${database.url} prop=myserver:9877

Reusable Configuration Format
{
"my.special.component" : {
"some_prop": 42,
"and_another": "some string"
},
"and.a.factory.cmp~foo" : {
...
},
"and.a.factory.cmp~bar" : {
...
}}
12

OSGi Configurator
§ Configurations as bundle resources
§ Binaries
§ State handling and ranking
13

Declarative Service

OSGi Preconceptions
15
✔?!

The Next Big Thing
16
https://github.com/cziegeler/samples.guessinggame

Building Blocks
§ Components
§ Services
§ Module aka Bundle
17

Game Design
18
Game Servlet
GET
POST
HTML
Game Controller
Game Bundle

Game Design - API
19
public enum Level {
EASY,
MEDIUM,
HARD
}
public interface GameController {
Game startGame(final String name,
final Level level);
int nextGuess(final Game status,
final int guess);
int getMax(final Level level);
}
public class Game {
// game status
}

Implementation
20
@Component
public class GameControllerImpl implements GameController {
...
import org.osgi.service.component.annotations.Component;

Configuration
21
public @interface Config {
int easy_max() default 10;
int medium_max() default 50;
int hard_max() default 100;
}
Range from 1 to a configurable max value per level
Configuration (Dictionary)
easy.max = "8"
medium.max = 40L

Integration with Configuration Admin
22
private Config configuration;
@Activate
protected void activate(final Config config) {
this.configuration = config;
}
int medium_max() default
50;
int hard_max() default 100;
}

© 2016 Adobe Systems Incorporated. All Rights Reserved. Adobe Confidential. 23
public int getMax(final Level level) {
int max = 0;
switch (level) {
case EASY : max = configuration.easy_max(); break;
case MEDIUM : max = configuration.medium_max(); break;
case HARD : max = configuration.hard_max(); break;
}
return max;
}

Game Design
24
Game Servlet
GET
POST
HTML
Game Controller
Game Bundle

Web?
25
@Component( service = Servlet.class ,
property="osgi.http.whiteboard.servlet.pattern=/game")
public class GameServlet extends HttpServlet {
@Reference
private GameController controller;

Game Design
26
Game Servlet
GET
POST
HTML
Game Controller
Game Bundle
https://github.com/cziegeler/samples.guessinggame

Management
27

Component Management
28

Metatype I
29
@ObjectClassDefinition(
name = "Game Configuration",
description = "The configuration for the guessing game.")
@AttributeDefinition(name="Easy",
description="Maximum value for easy")

Metatype II
30
@Component
@Designate( ocd = Config.class )
public class GameControllerImpl
implements GameController {

Declarative Services
§ Developing OSGi Services made easy
§ Configuration support
§ Reference management
§ Dealing with dynamics
31

Declarative Service Updates in R7
§ Field Injection of activation objects
§ Constructor injection
§ Nicer property handling
32

Field Activation
33
@Activate
protected void activate(final Config config) {
this.configuration = config;
}
@Activate

Constructor Injection
34
@Component
public class MyComponent {
@Activate
public MyComponent(
BundleContext bundleContext,
@Reference EventAdmin eventAdmin,
Config config,
@Reference List<Receivers> receivers) {

Cluster Information
previously known as Cloud Ecosystems

Cluster Information
OSGi frameworks running in a distributed environment
§ Cloud
§ IoT
§ <buzzword xyz in the future>
Many frameworks
§ New ones appearing
§ … and disappearing
§ Other entities too, like databases
36

Cluster Information
Discovery of OSGi frameworks in a distributed environment
§ Find out what is available
§ get notifications of changes
§ Provision your application within the given resources
§ Also: non-OSGi frameworks (e.g. Database)
§ Monitor your application
§ Provision changes if needed
RFC 183 – Implementation in Eclipse Concierge
37

Cluster Information
FrameworkNodeStatus service provides metadata
§ Java version
§ OSGi version
§ OS version
§ IP address
§ Physical location (country, ISO 3166)
§ Metrics
§ tags / other / custom
§ Provisioning API (install/start/stop/uninstall bundles etc…)
38

OSGi R7 Release

And much more...
§ Push Streams
§ JAXRS integration
§ Http Whiteboard Update
§ Transaction Control
§ JPA Updates
§ Remote Service Intents
40

R7 Early Spec Draft Available
§ https://www.osgi.org/developer/specifications/drafts/
41

BeJUG Meetup - What's coming in the OSGi R7 Specification

BeJUG Meetup - What's coming in the OSGi R7 Specification

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