Magnetic disk drive with reduced disk-to-disk spacing and improved
Europe on a Disk - Eclipsewiki.eclipse.org/images/f/fd/EuropeOnADisk.pdf · Harald Wellmann 10 Nov...
Transcript of Europe on a Disk - Eclipsewiki.eclipse.org/images/f/fd/EuropeOnADisk.pdf · Harald Wellmann 10 Nov...
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Harald Wellmann10 Nov 2008
Europe on a DiskGeodata Processing with Eclipse and OSGi
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Overview
� Past and Present of Navigation Data Processing
� Anaconda: The Future
� Our usage of OSGi and Eclipse
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�������������� �
�������� ���� ��
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Today, we know better...
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…and it‘s our job to put it on a disk again
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What is a Map Compiler?
� A Map Compiler compiles data, not programs.
� Raw geo-spatial data is compiled into a compact binary format.
� Data gets enriched, not just transformed
� ...to make the result usable in a car navigation system.
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Our Map Compiler Today
� A large distributed application
� written in C++ and C
� uses proprietary file managers and database engines
� Output: proprietary binary formats
� Input: GDF
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�������������� ������
�� ����� �� �����
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A Look at GDF
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� Input: RDF
� Relational Data Format from NAVTEQ
� Output: NDS
� Navigation Data Standard
� A vendor independent binary format for the next generation of Car Navigation Systems
New Data Formats
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A Look at NDS
� Industry standard
� Formally specified
� using DataScript
� Supports incremental updates
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A New Architecture for Compiling Navigation Databases
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Data Flow
� Anaconda supports multiple input and output formats.
� Compilation is largely decoupled from these formats.
� Data Supplier format changes only affect the import part.
Import 1
Import 2
Import 3
Generic Compilation
Export 1
Export 2
Export 3
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AVC1
Generic Compilation Process
Conversionof geographic data NNDBImport DB
(SQL)AVC1..n
Pre-Export(SQL)
transform transformgenerate
uplink uplink
export
Supplier-dependent formats
Generic Anaconda formats
Product-dependent formats
Delivery Data(Flat Files)
Product Data(BinaryFiles)
uplink
import
original format from Data Provider
relational representation of input format
Normalized Navigation Database,
independent of input and output
formats
Added Value Containers(generalized
layers, indices, ..)
relational representation
of output format
Navigation Databases for target systems
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Architecture Requirements
� Use standard database technology
� Use standard libraries and APIs wherever possible
� Enable distributed compilation
� Enforce component architecture with controlled dependencies
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Implementation Language
� The implementation language is Java
� Java 6.0 is required
� Motivation:
� Developer productivity
� A wealth of libraries for all generic and many domain-specific tasks
� No need to used embedded approaches in a server environment
� Easy building
� Platform independence
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Development Environment
� Anaconda uses the Eclipse Integrated Development Environment.
� Eclipse 3.4 (Ganymede)
� Motivation:
� Wide-spread, open source
� easy integration of other tools
� Support for OSGi-based development
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OSGi: Component Model
� Anaconda uses the OSGi component model.
� Each Anaconda component is an OSGi bundle.
� A bundle declares its dependencies on other bundles in its manifest.
� Classes from other bundles are not visible at run-time, unless the dependency is declared explicitly.
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OSGi Implementation
� Anaconda uses Eclipse Equinox
� Equinox has an extension called buddy class-loading enabling class loader callbacks:
� ������������ �����������������������������
� This is required by certain third-party libraries used by Anaconda.
� Thus, Anaconda will currently not work with other OSGi implementations.
� This would not be required if all third-party libraries were OSGi compliant.
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OSGi vs. Eclipse
� Anaconda is a pure OSGi console application.
� Eclipse is just the IDE.
� Anaconda does not depend on any Eclipse components
� ...except ����������������
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Getting Started
� Start a worker thread in the bundle activator.
� Make sure the thread survives the startup phase.
� Do not call long running or blocking methods in the bundle activators.
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Running
� The job to be executed is a � ������, registered as an OSGi service.
� The worker reads a job name from the config file,
� gets a matching service from the service registry
� and runs it.
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Static Services
� We do use OSGi services...
� ...but none of the dynamics.
� All services are registered during Framework startup.
� Bundle start levels ensure that a service is registered before it gets used.
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Start Levels
� The main bundle is started last.
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Stand-alone Deployment
� Anaconda is a console application running in an OSGi environment.
� Anaconda is installed in two folders:
� �� ����� containing the OSGi framework and all bundles
� ������ ������� ���������� listing bundles to be activated
� Command line for launching Anaconda!��� "#$ �������%
&!�� �� ����'�����( ����������!��
&������ ������ "������ ������%
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Equinox Configuration File
� Mainly a list of bundles with start levels
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Benefits of OSGi
� Bundles give structure to your application.
� Easy to use, if you play by the rules.
But...
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���������
������� �����
� � ��� ���� ����
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Third-Party Dependency Hell
� Third-party libraries come as plain old JARs, not as OSGi bundles.
� Libraries depend on other libraries.
� Libraries have dependency cycles.
� Version conflicts in transitive dependencies.
� Libraries use �������������
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Ways out of Hell
� Get ready-to-use OSGified libraries from SpringSource Enterprise Bundle Repository.� Caveat: Some manifests are broken or do not
work in every environment.
� Use Maven to manage your dependencies.
� Use buddy policies or fragment bundles to work around classpath issues.
� Rebuild libraries from source.
� Repackage a JAR with a new manifest.� ����)� ����)�� ��� helps
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NO CYCLES
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True or False:
Dependency cycles are a Bad Thing.
OSGi does not allow dependency cycles.n-1 Bundles from an n-cycle remain unresolved
All bundles get resolved on installing the last one
Eclipse has restrictions on plugin cycles.
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Sun's Sins
!��*�����!�� !��*������!��
���� �������!��� ��� ���� �������!��������
importsimports
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Eclipse Cycle Woes
� Eclipse PDE Batch build terminates when it finds a dependency cycle in your target platform.
� ...even though it does not have to build these bundles.
� There is partial relief:
����+,����������� - �� �
� undocumented � �������������� option in Eclipse 3.4
� to become visible on the UI in Eclipse 3.5
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A View on the Map Database
� Compiling is not enough.
� You want to visualize the results.
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Viewers
� JUMP (Java Unified Mapping Platform)
� As yet, the main viewer for Anaconda products
� uDig is another open source platform for geodata
� Built on top of
� Eclipse RCP
� Geotools
� Will replace JUMP for Anaconda.
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JUMP Screenshot
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uDig Screenshot
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uDig Benefits
� Based on OSGi and Eclipse RCP
� uDig plugins use standard Eclipse technology
� Plugin API for custom renderers (e.g. OpenGL, Java3D)
� Support for coordinate transformations
� LGPL license (vs. GPL for JUMP)
� Active and responsive community
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uDig Architecture
Source: http://udig.refractions.net/files/docs/osg05TechnologySession.pdf
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uDig Downsides
� Steep learning curve
� Third Party Hell
� A mega-bundle ���������������� �������� contains Geotools and all external dependencies.
� We are working with the communities to solve this.
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Features of our Viewer Plug-ins
� DataStore implementation for the NDS database format
� Multiple levels of detail in 2D map
� Scale-dependent layer selection
� Location input via Name Browser with automatic speller
� Route Calculation
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Further Plans
uDig shall be the basis of an integrated Anaconda Workbench
� Map Viewer
� Database Compilation Console
� Quality Assurance
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Links
� DataScript
� http://datascript.berlios.de
� uDig
� http://udig.refractions.net
� Geotools
� http://www.geotools.org
� My Blog
� http://hwellmann.blogspot.com