Transcript OSGi for FORCES

The OSGi Gateway and the Network
Delivery of Managed Services
Dave Marples
[email protected]
©2001 OSGi, All Rights Reserved
Aims and Objective
• To introduce everyone to the OSGi
• To show the way in which OSGi is expected to
develop
• To highlight problems that this deployment
model will create
• To start people thinking about how they might
contribute to solve the problems of next
generation software deployment – both to
OSGi and in general
©2001 OSGi, All Rights Reserved
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Overview
• Introduction
• Where OSGi fits in – purpose and
rationale
• System Architecture
• Technical Overview
• Implications for Feature Design
• Questions and Open discussion
©2001 OSGi, All Rights Reserved
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Who is OSGi?
2Wire, ABB, Acronet, Acunia, Adtranz PUTCC, Alcatel, AMI-C,
BellSouth, Broadband Gateways, Cablevision, CCL/ITRI, Coactive
Networks, Compaq, Deutsche Telekom, Domosys, e2-Home, Echelon,
Electricite de France, Electrolux Home Products, Elisa
Communications, emWare, Enikia, Ericsson, Espial Group, France
Telecom, Gatespace, Hewlett Packard, Home Director, IBM,
Infomatec, inSilicon, Invensys Controls, KDD R&D, Legend Computer
Systems, Lineo, Lucent Technologies, Maytag, Metavector, Motorola,
National Semiconductor, Netpliance, Nokia, Nortel Networks, Novell,
Oracle, Panasonic, Patriot Scientific, Philips, ProSyst Software,
PTSC, Quest, Samsung Electronics, Schindler Aufzuge, Schneider
Electric, ShareGate, Sharp, Shell, Siemens, Sonera, Sony, Sprint
Communications, ST Microelectronics, Sun Microsystems, Symbol
Technologies, TAC AB, Telcordia Technologies, Telia, Texas
Instruments, Tokyo Electric Power Company, Toshiba, Tridium,
Ucentric Systems, Ubicom, Union Fenosa, VDO Car Communications,
Verizon, Villa Montage Systems, Whirlpool, Wind River Systems, Yello
Strom
©2001 OSGi, All Rights Reserved
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What’s Missing?
• There are many
wide area network
standards
• There is no
service delivery
standard
• The are many inhome network
standards
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DOCSIS, DSL,
ISDN, Satellite,
W-CDMA…
OSGi
Bluetooth, CEBus
HAVi, HomePNA,
HomeRF, Jini,
LONWORKS, UPnP…
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What Is A
Services Gateway?
•A cable modem
•A set top box
•A DSL modem
•A web phone
•A PC
•A automotive multimedia gateway
•A dedicated residential gateway
•Anything running the OSGi APIs!
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Benefits of OSGi To
Cable Operators
• Increases “content” available on their systems
– Creates new service revenue opportunities
– Increases customer loyalty
– Reduces customer churn by increasing customer
switching costs
• Transforms set top boxes into an expandable
and extensible service delivery platform
– Enables provisioning of new services at virtually no
incremental cost
– Opens new market segments and services
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System Architecture
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End-to-End Model with
API Locations
Gateway Operator
Wide Area
Network
Local Network
Devices
Open Services Gateway
Service Provider
Client
Client
Service
Management
System
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Service 1
Service 2
OSGi Framework
Device
Standardized
OSGi API
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The OSGi API
1.0 Spec
Active work
Persistent data
Configuration data
Client access
Accounting info
HTTP
Device Access
Log
Services Framework
Java Virtual Machine
Embedded OS
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The OSGi API
• Enables zero-administration services
gateways
• Supports secure remote operation by a
service aggregator
• Enables multiple services to cooperatively
share a common services gateway
• Supports any combination of remote and
local networks
• Can be used in home, small business, home
office, auto, industrial applications
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Software Stack
Bundle
Bundle
Bundle
Bundle (Application)
= service interface
exported and imported
by bundles
OSGi
Java VM
Operating System
Driver
Driver
Driver
Hardware
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Bundle Interaction
OSGi Services Framework
Service
Registry
Bundle B
{…}
get
service
Bundle A
{...}
register
Install, start,
stop, update,
uninstall
Residential
Bluetooth
Gateway
Local
{…}
register
get
Networks
Internet
Java Virtual Machine
Platform (OS and Hardware)
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Technical Overview
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Goal
• Software framework for large
scale electronic service
deployment on small devices
• Network delivery of managed
services…
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Requirements
• Reliable
– large scale deployments fail without very
high reliability
• Portable
– Attract third party developers to create
the very much needed innovative services
• Dynamic
– Allow the configuration to adapt to users
and operator needs over time
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Requirements
• Security
– Protect service providers from each other
– Guarantee a certain quality of service
• Scalability
– Members have very different configurations
for their deployment of OSGi frameworks
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Functions
• Life Cycle Management
– Install, Start, Stop, Update, Uninstall
• Component model
• Remote management
• Basic utility services: Logging, HTTP,
Device access
• Clean separation of specification and
implementation
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Key Benefits
• Platform independence (Java)
• Services can be deployed and upgraded
dynamically
• Multiple independent services within a
single services framework
• Java security
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OSGi Terminology
• A Bundle is the deliverable application
– Like a Windows EXE file
• It registers zero or more services
– A service is specified as a Java interface
and implemented by some bundles
• Lookups can be used to find services
from other bundles
– Query language
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Dependency
Management
• When a bundle is stopped, it is cleaned up
– Registered services are removed
– References to other services removed
• Bundles can be notified when a service
they depend on is unregistered
• Class path dependencies are managed
• Model will allow long running applications
with dynamic software updates
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Management
• Residential gateways need remote management
• Management system controls via a bundle
• Due to the download facility of the resident
gateway, APIs can replace protocols
• Only protocol required is bootstrap
– But this is usually implementation dependent
anyway
– Being considered for standardization
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The Next Steps
Work for OSGi 2.0
©2001 OSGi, All Rights Reserved
New Work Areas…
• Remote Management
– Protocols and APIs
• Specialist (Vertical?) Segments
– In-Vehicle
• Dedicated Security Group
• Device Discovery and Excitation
• User Interface Group, Phones Group, CM
Group?
©2001 OSGi, All Rights Reserved
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Approximate
Timescales…
• OSGi Service Platform Release 2
– Publicly available end Q2 2001
• Revision of 1.0 specification plus…
• Accounting, Configuration Management, User Manager,
Preferences
• OSGi Vehicle Release 1 (2001)
• OSGi Remote Management Release 1 (2001)
• OSGi Cable Platform Release 1 (???-TBD)
• Individual specifications can be released when
ready, and formed into ‘Releases’ when needed.
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Issues
• In this multi-vendor world we’re going to see
many different services, from independent
operators, all needing to work together. HOW?
• We want to be able to deploy services onto the
available in home devices to render the service
– how can we describe these capabilities?
• Our software development and deployment
models are not ready for massive scale
distribution and interworking – Discuss.
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Technical Backup
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Framework
• org.osgi.framework
• Programmable environment for hosting
dynamically downloadable services
– service inter-dependency
– service download and lifecycle
– ...
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The framework
Framework
Bundle A
{}
Bundle B
{}
Bundle C
{}
= service, java interface
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Bundle
Bundle A
{}
• A JAR file (zip) containing
– Java classes
– Manifest with information about bundle
– Resources
• Can also act like a DLL (Shared Library)
• Framework can install/update/uninstall
bundles
• Bundles can be started and stopped
©2001 OSGi, All Rights Reserved
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Service
• A service is an object registered by a bundle
to be used by other bundles
• The specification of a service is a Java
interface
• Different bundles (read vendors) can
implement the same interface
• Implementation is indistinguishable for users
• The OSGi defines a standard set of services
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Java Interfaces
public interface Log {
public void log(String s);
}
Gets (with query)
Bundle
Log
public class SimpleLog implements Log {
public void log(String s) {
System.out.println( s );
}
}
Simple
Log
©2001 OSGi, All Rights Reserved
interface
implements
IBM
Log
Motorola
Log
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The Framework
Install A
start
Framework
Bundle A
{}
Bundle B events: register
{}
events: install
Bundle C
{}
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The Framework
Framework
Uninstall
stop
Bundle A
{}
Bundle B events: unregister
{}
events: uninstall
Bundle C
{}
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A service defined
get
register
Object that get
implements a
Java Interface
get
events: REGISTERED, UNREGISTERING,
MODIFIED
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An example with
services
Bundle A
{}
Registry
register
Bundle B
{}
Publisher
get
WAP
bundle
Events: register, unregister
Bundle C
{}
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Service Factories
• A Factory allows a bundle to control what
object a bundle gets
• Framework calls back the factory for
service creation
Bundle A
{}
Bundle B
{}
©2001 OSGi, All Rights Reserved
Framework
Bundle
Standard
Bundle
Factory
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Real code! Hello World
•
HelloWorld.java:
package ericsson.osgi.hello;
import org.osgi.framework.*;
public class HelloWorld implements BundleActivator {
public void start( BundleContext context ) throws
Exception{
System.out.println( "Hello world" );
}
public void stop( BundleContext context ) throws Exception
{
System.out.println( "Goodbye world" );
}
}
•
Manifest:
Manifest-Version: 1.0
Bundle-Activator: ericsson.osgi.hello.HelloWorld
©2001 OSGi, All Rights Reserved
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To get and register a service
•
public interface GPS {
…
}
•
public void foo( BundleContext context ) {
Garmin garmin = new Garmin(…);
Hashtable properties = new Hashtable();
properties.put( "vendor", "garmin" );
ServiceRegistration reg = context.registerService(
GPS.class.getName(),
garmin,
properties );
}
•
public void bar( BundleContext context ) {
ServiceReference ref = context.getService(
GPS.class.getName() );
GPS
gps = context.getService( ref );
…
}
©2001 OSGi, All Rights Reserved
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"Process model"
• A bundle is installed on a framework once
• Services registered by a bundle can be
optionally configurable
• OSGi will define more extensive
configuration management in the next
release
– IBM Configuration proposal
– ERICSSON Task management
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Native code
• JAR file contains both Java classes +
native code
• Matching of correct operating system,
processor and language
• Life cycle bound to bundles life cycle
• Requires Java 1.2 support
• Notice that JAR format is only delivery
format
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Native code
• Java Supports native code with the
"native" keyword
–
public class Native {
public native void test();
}
• OSGi has a number of Manifest headers
allowing shared libraries to be included
–
Manifest-Version: 1.0
Bundle-Name: NativeCodeTest
Bundle-NativeCode:
http.dll;os=Win95;processor=x86
http.so;os=Solaris;processor=x86;language=en
http_deutsch.so;os=Solaris;processor=x86;language=de
http_sparc.so;os=Solaris;processor=sparc
©2001 OSGi, All Rights Reserved
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Current Service APIs
• Logging
– Standard way for a bundle to provide progress
information with access to log information
• HTTP server, Servlet Engine
– Allows registration of servlets, access to
resources
• Device Access
– Interface to hardware
– Generic model for matching devices to drivers
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LOG Service
• org.osgi.service.log
• This service enables the specification,
recording, and receiving of messages
(e.g., messages related to specific
events and errors)
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HTTP Service
• org.osgi.service.http
• This service allows the access to
resources (e.g., files, images) and server
programs (Java servlets) via HTTP
(either HTTP 1.0 or 1.1)
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Device Access
• org.osgi.service.device
• This service specifies the way in which
devices can be found (through matching)
and the appropriate device drivers can be
associated with the devices
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Device Access
Device
Bundle
Camera
Driver
Locator
magic
event: register
IEEE
1394B
Network
Interface
bundle
TV
match
TV
Bundle
register
Device
get
Camera
Sony
CCD542
get
register
event: register
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Management,
protocols or API?
Management
System
Standard protocol
Residential
Gateway
Local
Ethernet
Access
Net
Private protocol
Local
Powernet
= Bundle
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©2001 OSGi, All Rights Reserved
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