!"#$%&'&()*+,-&./)&0*./& - - PowerPoint PPT Presentation

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!"#$%&'&()*+,-&./)&0*./& - - PowerPoint PPT Presentation

Mar 30, 2023 547 likes •2.52k views

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Rb' D763'P'O#Q+%;'&9#':Q&9'

slide-38
SLIDE 38

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slide-39
SLIDE 39

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slide-40
SLIDE 40

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slide-41
SLIDE 41

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slide-42
SLIDE 42

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slide-43
SLIDE 43

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Bundle-ManifestVersion: 2 Bundle-SymbolicName: org.foo.simplebundle Bundle-Version: 1.0.0 Bundle-ClassPath: .,org/foo/embedded.jar Import-Package:

  • sgi.service.log; version="[1.0.0,1.1.0)",
  • rg.foo.service; version="1.1"

Export-Package:

  • rg.foo.service; version="1.1";

vendor="org.foo",

  • rg.foo.service.bar; version="1.1";

uses:="org.foo.service"

slide-44
SLIDE 44

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Bundle-ManifestVersion: 2 Bundle-SymbolicName: org.foo.simplebundle Bundle-Version: 1.0.0 Bundle-ClassPath: .,org/foo/embedded.jar Import-Package:

  • sgi.service.log; version="[1.0.0,1.1.0)",
  • rg.foo.service; version="1.1"

Export-Package:

  • rg.foo.service; version="1.1";

vendor="org.foo",

  • rg.foo.service.bar; version="1.1";

uses:="org.foo.service"

Indicates R4 semantics and syntax

slide-45
SLIDE 45

(4,-9)&02,$@)<.&P\25>9)&

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Bundle-ManifestVersion: 2 Bundle-SymbolicName: org.foo.simplebundle Bundle-Version: 1.0.0 Bundle-ClassPath: .,org/foo/embedded.jar Import-Package:

  • sgi.service.log; version="[1.0.0,1.1.0)",
  • rg.foo.service; version="1.1"

Export-Package:

  • rg.foo.service; version="1.1";

vendor="org.foo",

  • rg.foo.service.bar; version="1.1";

uses:="org.foo.service"

Indicates R4 semantics and syntax

Globally unique ID

slide-46
SLIDE 46

(4,-9)&02,$@)<.&P\25>9)&

Z^' D763'P'O#Q+%;'&9#':Q&9'

Bundle-ManifestVersion: 2 Bundle-SymbolicName: org.foo.simplebundle Bundle-Version: 1.0.0 Bundle-ClassPath: .,org/foo/embedded.jar Import-Package:

  • sgi.service.log; version="[1.0.0,1.1.0)",
  • rg.foo.service; version="1.1"

Export-Package:

  • rg.foo.service; version="1.1";

vendor="org.foo",

  • rg.foo.service.bar; version="1.1";

uses:="org.foo.service"

Internal bundle class path

slide-47
SLIDE 47

(4,-9)&02,$@)<.&P\25>9)&

Zb' D763'P'O#Q+%;'&9#':Q&9'

Bundle-ManifestVersion: 2 Bundle-SymbolicName: org.foo.simplebundle Bundle-Version: 1.0.0 Bundle-ClassPath: .,org/foo/embedded.jar Import-Package:

  • sgi.service.log; version="[1.0.0,1.1.0)",
  • rg.foo.service; version="1.1"

Export-Package:

  • rg.foo.service; version="1.1";

vendor="org.foo",

  • rg.foo.service.bar; version="1.1";

uses:="org.foo.service"

Import of a package version range

slide-48
SLIDE 48

(4,-9)&02,$@)<.&P\25>9)&

Zd' D763'P'O#Q+%;'&9#':Q&9'

Bundle-ManifestVersion: 2 Bundle-SymbolicName: org.foo.simplebundle Bundle-Version: 1.0.0 Bundle-ClassPath: .,org/foo/embedded.jar Import-Package:

  • sgi.service.log; version="[1.0.0,1.1.0)",
  • rg.foo.service; version="1.1"

Export-Package:

  • rg.foo.service; version="1.1";

vendor="org.foo",

  • rg.foo.service.bar; version="1.1";

uses:="org.foo.service"

Importing an exported package

slide-49
SLIDE 49

(4,-9)&02,$@)<.&P\25>9)&

Ze' D763'P'O#Q+%;'&9#':Q&9'

Bundle-ManifestVersion: 2 Bundle-SymbolicName: org.foo.simplebundle Bundle-Version: 1.0.0 Bundle-ClassPath: .,org/foo/embedded.jar Import-Package:

  • sgi.service.log; version="[1.0.0,1.1.0)",
  • rg.foo.service; version="1.1"

Export-Package:

  • rg.foo.service; version="1.1";

vendor="org.foo",

  • rg.foo.service.bar; version="1.1";

uses:="org.foo.service"

Exported package with version and arbitrary attribute

slide-50
SLIDE 50

(4,-9)&02,$@)<.&P\25>9)&

]h' D763'P'O#Q+%;'&9#':Q&9'

Bundle-ManifestVersion: 2 Bundle-SymbolicName: org.foo.simplebundle Bundle-Version: 1.0.0 Bundle-ClassPath: .,org/foo/embedded.jar Import-Package:

  • sgi.service.log; version="[1.0.0,1.1.0)",
  • rg.foo.service; version="1.1"

Export-Package:

  • rg.foo.service; version="1.1";

vendor="org.foo",

  • rg.foo.service.bar; version="1.1";

uses:="org.foo.service"

Provided package with dependency on exported package

slide-51
SLIDE 51

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slide-52
SLIDE 52

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]H' D763'P'O#Q+%;'&9#':Q&9'

slide-53
SLIDE 53

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]R' D763'P'O#Q+%;'&9#':Q&9'

slide-54
SLIDE 54

!"#$&V)>),-),?*&0+-)9&

F2?72A)c9)Q)9&Q<&5+-49)c9)Q)9&-)>),-),?$)<& ! G9+'J)'?9/&' 0+-49)c9)Q)9&-)>),-),?$)<& ! !+/-)#'L-/3%#;' ! 4-#'<-3n"#' ! M3;#'&9#'&-2#';#=#%;#%*3#)' F2?72A)c9)Q)9&-)>),-),?$)<& ! @3%#'L-/3%#;' ! @"#C3<"#.'#%/<"#'-#I/*&+-3%L' ! 4-#'&9#'&-2#';#=#%;#%*3#)'X35#5.'&9#Qo-#'3%'&9#'*+;#Y' F2?72A)c9)Q)9&-)>),-),?$)<&:)84$:)&>2?72A)<&.+&3)&2.+5$?&`$f)fE&$,&2&<$,A9)& 34,-9)b&

]Z' D763'P'O#Q+%;'&9#':Q&9'

slide-55
SLIDE 55

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]]' D763'P'O#Q+%;'&9#':Q&9'

slide-56
SLIDE 56

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A B C

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slide-57
SLIDE 57

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  • #)+"J#;'

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A B C

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slide-58
SLIDE 58

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  • #)+"J#;'

! VI'/'J#-)3+%'+-'/-<3&-/-Q'/n-3<2&#)'/-#')=#*3`#;'+%'3$=+-&).'&9#%'#C=+-&)'$2)&' $/&*9' A :2"8="#'/n-3<2&#)'+%'/%'3$=+-&'/-#'"+L3*/""Q'DMV)-&

]d' D763'P'O#Q+%;'&9#':Q&9'

A B C

5;4.)$# K(8(MA1&)8'&$A%\4# &M4.)$# K(8(MA1&)8'&$A%\4# 5;4.)$# K(8(MA1&)8'&$# &M4.)$# K(8(MA1&)8'&$#

slide-59
SLIDE 59

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:'

C A B

slide-60
SLIDE 60

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049;>9)&52.?/$,A&>:+Q$-):<& & & & & & & & ! \#)+"28+%'/"L+-3&9$'+-;#-)'$/&*93%L'=-+J3;#-)' A 4"-#/;Q'-#)+"J#;'=-+J3;#-)'+-;#-#;'<Q';#*-#/)3%L'J#-)3+%' A N%-#)+"J#;'=-+J3;#-)'+-;#-#;'<Q';#*-#/)3%L'J#-)3+%' A VI'J#-)3+%)'/-#'#12/".'$/&*93%L'=-+J3;#-)'/-#'+-;#-#;'</)#;'+%'3%)&/""/8+%'+-;#-'

^h' D763'P'O#Q+%;'&9#':Q&9'

5;4.)$# K(8(MA1&)8'&$[# 8&)15."]^GA_A`^# &M4.)$# K(8(MA1&)8'&$[# 8&)15."]^GAaA`^# &M4.)$# K(8(MA1&)8'&$[# 8&)15."]^GA_A`^#

:'

C A B

slide-61
SLIDE 61

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1)&/2Q)&2&<$5>9)&>2$,.&>:+A:25&

^g' D763'P'O#Q+%;'&9#':Q&9'

7).;#$%&#H-65#5"#=EX."# :..C#

slide-62
SLIDE 62

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^H' D763'P'O#Q+%;'&9#':Q&9'

META-INF/ META-INF/MANIFEST.MF

  • rg/
  • rg/foo/
  • rg/foo/paint/
  • rg/foo/paint/PaintFrame$1$1.class
  • rg/foo/paint/PaintFrame$1.class
  • rg/foo/paint/PaintFrame$ShapeActionListener.class
  • rg/foo/paint/PaintFrame.class
  • rg/foo/paint/SimpleShape.class
  • rg/foo/paint/ShapeComponent.class
  • rg/foo/shape/
  • rg/foo/shape/Circle.class
  • rg/foo/shape/circle.png
  • rg/foo/shape/Square.class
  • rg/foo/shape/square.png
  • rg/foo/shape/Triangle.class
  • rg/foo/shape/triangle.png
slide-63
SLIDE 63

M+,c0+-492:&F2$,.&F:+A:25&`Iajb&

O.&$<&>2?72A)-&2<&2&<$,A9)&UDd&_9)&S$./&./)&@+99+S$,A&?+,.),.<'&

^R' D763'P'O#Q+%;'&9#':Q&9'

META-INF/ META-INF/MANIFEST.MF

  • rg/
  • rg/foo/
  • rg/foo/paint/
  • rg/foo/paint/PaintFrame$1$1.class
  • rg/foo/paint/PaintFrame$1.class
  • rg/foo/paint/PaintFrame$ShapeActionListener.class
  • rg/foo/paint/PaintFrame.class
  • rg/foo/paint/SimpleShape.class
  • rg/foo/paint/ShapeComponent.class
  • rg/foo/shape/
  • rg/foo/shape/Circle.class
  • rg/foo/shape/circle.png
  • rg/foo/shape/Square.class
  • rg/foo/shape/square.png
  • rg/foo/shape/Triangle.class
  • rg/foo/shape/triangle.png

Main implementation package is

  • rg.foo.paint
slide-64
SLIDE 64

M+,c0+-492:&F2$,.&F:+A:25&`Iajb&

O.&$<&>2?72A)-&2<&2&<$,A9)&UDd&_9)&S$./&./)&@+99+S$,A&?+,.),.<'&

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META-INF/ META-INF/MANIFEST.MF

  • rg/
  • rg/foo/
  • rg/foo/paint/
  • rg/foo/paint/PaintFrame$1$1.class
  • rg/foo/paint/PaintFrame$1.class
  • rg/foo/paint/PaintFrame$ShapeActionListener.class
  • rg/foo/paint/PaintFrame.class
  • rg/foo/paint/SimpleShape.class
  • rg/foo/paint/ShapeComponent.class
  • rg/foo/shape/
  • rg/foo/shape/Circle.class
  • rg/foo/shape/circle.png
  • rg/foo/shape/Square.class
  • rg/foo/shape/square.png
  • rg/foo/shape/Triangle.class
  • rg/foo/shape/triangle.png

Static main method in PaintFrame

slide-65
SLIDE 65

M+,c0+-492:&F2$,.&F:+A:25&`Iajb&

O.&$<&>2?72A)-&2<&2&<$,A9)&UDd&_9)&S$./&./)&@+99+S$,A&?+,.),.<'&

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META-INF/ META-INF/MANIFEST.MF

  • rg/
  • rg/foo/
  • rg/foo/paint/
  • rg/foo/paint/PaintFrame$1$1.class
  • rg/foo/paint/PaintFrame$1.class
  • rg/foo/paint/PaintFrame$ShapeActionListener.class
  • rg/foo/paint/PaintFrame.class
  • rg/foo/paint/SimpleShape.class
  • rg/foo/paint/ShapeComponent.class
  • rg/foo/shape/
  • rg/foo/shape/Circle.class
  • rg/foo/shape/circle.png
  • rg/foo/shape/Square.class
  • rg/foo/shape/square.png
  • rg/foo/shape/Triangle.class
  • rg/foo/shape/triangle.png

Interface SimpleShape supports multiple shape implementations

slide-66
SLIDE 66

M+,c0+-492:&F2$,.&F:+A:25&`Iajb&

O.&$<&>2?72A)-&2<&2&<$,A9)&UDd&_9)&S$./&./)&@+99+S$,A&?+,.),.<'&

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META-INF/ META-INF/MANIFEST.MF

  • rg/
  • rg/foo/
  • rg/foo/paint/
  • rg/foo/paint/PaintFrame$1$1.class
  • rg/foo/paint/PaintFrame$1.class
  • rg/foo/paint/PaintFrame$ShapeActionListener.class
  • rg/foo/paint/PaintFrame.class
  • rg/foo/paint/SimpleShape.class
  • rg/foo/paint/ShapeComponent.class
  • rg/foo/shape/
  • rg/foo/shape/Circle.class
  • rg/foo/shape/circle.png
  • rg/foo/shape/Square.class
  • rg/foo/shape/square.png
  • rg/foo/shape/Triangle.class
  • rg/foo/shape/triangle.png

Shape implementations defined in org.foo.shape

slide-67
SLIDE 67

M+,c0+-492:&F2$,.&F:+A:25&`jajb&

d)92;+,</$>&25+,A&?92<<)<&

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Paint Frame Simple Shape Shape Component Circle Square Triangle b# c# b# c#

slide-68
SLIDE 68

M+,c0+-492:&F2$,.&F:+A:25&`jajb&

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Paint Frame Simple Shape Shape Component Circle Square Triangle b# c# b# c# How to decompose into bundles?

slide-69
SLIDE 69

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Shape Paint

Square

&M4.)$# .)*AD..A1%(4&A1d,()&# &M4.)$# .)*AD..A1%(4&#

Triangle

&M4.)$# .)*AD..A1%(4&A$)5("*'&#

Circle

&M4.)$# .)*AD..A1%(4&AE5)E'&#

slide-70
SLIDE 70

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SLIDE 72

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SLIDE 73

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SLIDE 74

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SLIDE 75

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SLIDE 76

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INSTALLED RESOLVED UNINSTALLED STARTING STOPPING ACTIVE &M4'5E5$# (,$.;(XE# 5"1$(''# ,4J($&# ,"5"1$(''# )&1.'8&# ,"5"1$(''# 1$()$# 1$.4#

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SLIDE 77

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SLIDE 78

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SLIDE 79

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SLIDE 80

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SLIDE 81

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public interface BundleActivator { void start(BundleContext context) throws Exception; void stop(BundleContext context) throws Exception; }

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SLIDE 82

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public interface BundleActivator { void start(BundleContext context) throws Exception; void stop(BundleContext context) throws Exception; } Bundle-Activator: <fully-qualified-class-name> &A*A># Bundle-Activator: org.foo.MyActivator

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SLIDE 83

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public interface BundleActivator { void start(BundleContext context) throws Exception; void stop(BundleContext context) throws Exception; } Bundle-Activator: <fully-qualified-class-name> &A*A># Bundle-Activator: org.foo.MyActivator What are these?

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SLIDE 84

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public interface BundleContext { String getProperty(String key); Bundle getBundle(); Bundle installBundle(String location) throws BundleException; Bundle installBundle(String location, InputStream input) throws BundleException; Bundle getBundle(long id); Bundle[] getBundles(); ... void addBundleListener(BundleListener listener); void removeBundleListener(BundleListener listener); void addFrameworkListener(FrameworkListener listener); void removeFrameworkListener(FrameworkListener listener); ... File getDataFile(String filename); ... }

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SLIDE 85

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public interface BundleContext { String getProperty(String key); Bundle getBundle(); Bundle installBundle(String location) throws BundleException; Bundle installBundle(String location, InputStream input) throws BundleException; Bundle getBundle(long id); Bundle[] getBundles(); ... void addBundleListener(BundleListener listener); void removeBundleListener(BundleListener listener); void addFrameworkListener(FrameworkListener listener); void removeFrameworkListener(FrameworkListener listener); ... File getDataFile(String filename); ... }

Lifecycle method to install other bundles

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SLIDE 86

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Access to other installed bundles

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SLIDE 87

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Access to our own bundle... what's that?

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SLIDE 88

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SLIDE 89

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SLIDE 90

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Lifecycle method to stop bundle

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SLIDE 91

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Lifecycle method to update bundle

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SLIDE 92

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Lifecycle method to uninstall bundle

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SLIDE 93

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Access to bundle resources

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SLIDE 94

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Access to accessible classes

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SLIDE 95

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SLIDE 97

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SLIDE 98

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public interface PackageAdmin { static final int BUNDLE_TYPE_FRAGMENT = 0x00000001; Bundle getBundle(Class clazz); Bundle[] getBundles(String symbolicName, String versionRange); int getBundleType(Bundle bundle); ExportedPackage getExportedPackage(String name); ExportedPackage[] getExportedPackages(Bundle bundle); ExportedPackage[] getExportedPackages(String name); Bundle[] getFragments(Bundle bundle); RequiredBundle[] getRequiredBundles(String symbolicName); Bundle[] getHosts(Bundle bundle); void refreshPackages(Bundle[] bundles); boolean resolveBundles(Bundle[] bundles); }

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public interface PackageAdmin { static final int BUNDLE_TYPE_FRAGMENT = 0x00000001; Bundle getBundle(Class clazz); Bundle[] getBundles(String symbolicName, String versionRange); int getBundleType(Bundle bundle); ExportedPackage getExportedPackage(String name); ExportedPackage[] getExportedPackages(Bundle bundle); ExportedPackage[] getExportedPackages(String name); Bundle[] getFragments(Bundle bundle); RequiredBundle[] getRequiredBundles(String symbolicName); Bundle[] getHosts(Bundle bundle); void refreshPackages(Bundle[] bundles); boolean resolveBundles(Bundle[] bundles); } Provides various methods to introspect bundle dependencies

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public interface PackageAdmin { static final int BUNDLE_TYPE_FRAGMENT = 0x00000001; Bundle getBundle(Class clazz); Bundle[] getBundles(String symbolicName, String versionRange); int getBundleType(Bundle bundle); ExportedPackage getExportedPackage(String name); ExportedPackage[] getExportedPackages(Bundle bundle); ExportedPackage[] getExportedPackages(String name); Bundle[] getFragments(Bundle bundle); RequiredBundle[] getRequiredBundles(String symbolicName); Bundle[] getHosts(Bundle bundle); void refreshPackages(Bundle[] bundles); boolean resolveBundles(Bundle[] bundles); } So, how do we gain access to this API?

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SLIDE 118

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SLIDE 120

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Service Registry

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SLIDE 121

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Y,:'51%# Service Registry Service Provider Service Description

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SLIDE 122

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75"J# Service Requester Y,:'51%# Service Registry Service Provider Service Description

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SLIDE 123

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75"J# Service Requester Y,:'51%# Service Registry Service Provider Service Description R5"J#

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SLIDE 124

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SLIDE 126

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INSTALLED RESOLVED UNINSTALLED STARTING STOPPING ACTIVE &M4'5E5$# (,$.;(XE# 5"1$(''# ,4J($&# ,"5"1$(''# )&1.'8&# ,"5"1$(''# 1$()$# 1$.4#

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RESOLVED UNINSTALLED &M4'5E5$# (,$.;(XE# ,4J($&# ,"5"1$(''# ,"5"1$(''# INSTALLED 5"1$(''# )&1.'8&# STARTING STOPPING ACTIVE 1$()$# 1$.4#

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SLIDE 128

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SLIDE 129

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package com.foo.hello; public interface Hello { void sayHello(String name); }

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package com.foo.hello; public interface Hello { void sayHello(String name); } package com.foo.hello.impl; import com.foo.hello; public class HelloImpl implements Hello { public void sayHello(String name) { System.out.println("Hello " + name + "!"); } }

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public interface BundleContext { … void addServiceListener(ServiceListener listener, String filter) throws InvalidSyntaxException; void addServiceListener(ServiceListener listener); void removeServiceListener(ServiceListener listener); ServiceRegistration registerService( String[] clazzes, Object service, Dictionary props); ServiceRegistration registerService( String clazz, Object service, Dictionary props); ServiceReference[] getServiceReferences(String clazz, String filter) throws InvalidSyntaxException; ServiceReference getServiceReference(String clazz); Object getService(ServiceReference reference); boolean ungetService(ServiceReference reference); }

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public interface BundleContext { … void addServiceListener(ServiceListener listener, String filter) throws InvalidSyntaxException; void addServiceListener(ServiceListener listener); void removeServiceListener(ServiceListener listener); ServiceRegistration registerService( String[] clazzes, Object service, Dictionary props); ServiceRegistration registerService( String clazz, Object service, Dictionary props); ServiceReference[] getServiceReferences(String clazz, String filter) throws InvalidSyntaxException; ServiceReference getServiceReference(String clazz); Object getService(ServiceReference reference); boolean ungetService(ServiceReference reference); } We have two methods for publishing services

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package com.foo.hello.impl; import org.osgi.framework.*; public class Activator implements BundleActivator { private ServiceRegistration m_reg = null; public void start(BundleContext context) { m_reg = context.registerService( com.foo.hello.Hello.class.getName(), new HelloImpl(), null); } public void stop(BundleContext context) { m_reg.unregister(); } }

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package com.foo.hello.impl; import org.osgi.framework.*; public class Activator implements BundleActivator { private ServiceRegistration m_reg = null; public void start(BundleContext context) { m_reg = context.registerService( com.foo.hello.Hello.class.getName(), new HelloImpl(), null); } public void stop(BundleContext context) { m_reg.unregister(); } } We register the service when starting, which makes it available to other bundles

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package com.foo.hello.impl; import org.osgi.framework.*; public class Activator implements BundleActivator { private ServiceRegistration m_reg = null; public void start(BundleContext context) { m_reg = context.registerService( com.foo.hello.Hello.class.getName(), new HelloImpl(), null); } public void stop(BundleContext context) { m_reg.unregister(); } } We unregister it when stopping

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Bundle-ManifestVersion: 2 Bundle-SymbolicName: com.foo.hello.impl Export-Package: com.foo.hello Import-Package: org.osgi.framework, com.foo.hello Bundle-Activator: com.foo.hello.impl.Activator

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public interface BundleContext { … void addServiceListener(ServiceListener listener, String filter) throws InvalidSyntaxException; void addServiceListener(ServiceListener listener); void removeServiceListener(ServiceListener listener); ServiceRegistration registerService( String[] clazzes, Object service, Dictionary props); ServiceRegistration registerService( String clazz, Object service, Dictionary props); ServiceReference[] getServiceReferences(String clazz, String filter) throws InvalidSyntaxException; ServiceReference getServiceReference(String clazz); Object getService(ServiceReference reference); boolean ungetService(ServiceReference reference); }

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public interface BundleContext { … void addServiceListener(ServiceListener listener, String filter) throws InvalidSyntaxException; void addServiceListener(ServiceListener listener); void removeServiceListener(ServiceListener listener); ServiceRegistration registerService( String[] clazzes, Object service, Dictionary props); ServiceRegistration registerService( String clazz, Object service, Dictionary props); ServiceReference[] getServiceReferences(String clazz, String filter) throws InvalidSyntaxException; ServiceReference getServiceReference(String clazz); Object getService(ServiceReference reference); boolean ungetService(ServiceReference reference); } We have methods to find service references and get service objects

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package com.foo.hello.client; import org.osgi.framework.*; import com.foo.hello.Hello; public class HelloClient implements BundleActivator { public void start(BundleContext context) { ServiceReference ref = context.getServiceReference( com.foo.hello.Hello.class.getName()); if (ref != null) { Hello h = (Hello) context.getService(ref); if (h != null) { h.sayHello("World"); context.ungetService(h); } } } … }

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package com.foo.hello.client; import org.osgi.framework.*; import com.foo.hello.Hello; public class HelloClient implements BundleActivator { public void start(BundleContext context) { ServiceReference ref = context.getServiceReference( com.foo.hello.Hello.class.getName()); if (ref != null) { Hello h = (Hello) context.getService(ref); if (h != null) { h.sayHello("World"); context.ungetService(h); } } } … }

We first get the service reference

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package com.foo.hello.client; import org.osgi.framework.*; import com.foo.hello.Hello; public class HelloClient implements BundleActivator { public void start(BundleContext context) { ServiceReference ref = context.getServiceReference( com.foo.hello.Hello.class.getName()); if (ref != null) { Hello h = (Hello) context.getService(ref); if (h != null) { h.sayHello("World"); context.ungetService(h); } } } … }

From the service reference we get the service object

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package com.foo.hello.client; import org.osgi.framework.*; import com.foo.hello.Hello; public class HelloClient implements BundleActivator { public void start(BundleContext context) { ServiceReference ref = context.getServiceReference( com.foo.hello.Hello.class.getName()); if (ref != null) { Hello h = (Hello) context.getService(ref); if (h != null) { h.sayHello("World"); context.ungetService(h); } } } … }

We use the service like a normal object

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package com.foo.hello.client; import org.osgi.framework.*; import com.foo.hello.Hello; public class HelloClient implements BundleActivator { public void start(BundleContext context) { ServiceReference ref = context.getServiceReference( com.foo.hello.Hello.class.getName()); if (ref != null) { Hello h = (Hello) context.getService(ref); if (h != null) { h.sayHello("World"); context.ungetService(h); } } } … }

And release the service object when we are done with it

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Bundle-ManifestVersion: 2 Bundle-SymbolicName: com.foo.hello.client Import-Package: com.foo.hello,

  • rg.osgi.framework

Bundle-Activator: com.foo.hello.client.Activator

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SLIDE 146

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N.#'51$&"#D.)#&8&"$1# BundleContext.addServiceListener()

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SLIDE 147

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!;4'&;&"$#'51$&"&)#5"$&)D(E&# public interface ServiceListener extends EventListener { public void serviceChanged(ServiceEvent event); }

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SLIDE 148

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e&E&58&J#&8&"$# public class ServiceEvent extends EventObject { public final static int REGISTERED = 0x00000001; public final static int MODIFIED = 0x00000002; public final static int UNREGISTERING = 0x00000004; … public ServiceReference getServiceReference() { … } public int getType() { … } }

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SLIDE 149

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e&E&58&J#&8&"$# public class ServiceEvent extends EventObject { public final static int REGISTERED = 0x00000001; public final static int MODIFIED = 0x00000002; public final static int UNREGISTERING = 0x00000004; … public ServiceReference getServiceReference() { … } public int getType() { … } } Even though service are just normal objects, they are potentially much more volatile, so service events are very important

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SLIDE 150

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Framework Service registry

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