1. D763 provides modular software systems and solutions through component-based construction, managing and updating components. 2. The company focuses on mobile devices, modularization, and integration platforms, developing applications for Android and Java platforms. 3. D763 emphasizes simplifying software construction through modular and dynamic applications built from reusable components that work together.

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implementations
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org/foo/paint/ShapeComponent.class
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org/foo/shape/Circle.class
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org/foo/paint/PaintFrame.class
org/foo/paint/SimpleShape.class
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Bundle installBundle(String location, InputStream input)
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Bundle getBundle(long id);
Bundle[] getBundles();
...
void addBundleListener(BundleListener listener);
void removeBundleListener(BundleListener listener);
void addFrameworkListener(FrameworkListener listener);
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85. (4,-9)&=+,.).&
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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);
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86. (4,-9)&=+,.).&
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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); Access to other
Bundle[] getBundles(); installed bundles
...
void addBundleListener(BundleListener listener);
void removeBundleListener(BundleListener listener);
void addFrameworkListener(FrameworkListener listener);
void removeFrameworkListener(FrameworkListener listener);
...
File getDataFile(String filename);
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D763'P'O#Q+%;'&9#':Q&9' d^'

87. (4,-9)&=+,.).&
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public interface BundleContext {
String getProperty(String key);
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Bundle getBundle();
what's that?
Bundle installBundle(String location) throws BundleException;
Bundle installBundle(String location, InputStream input)
throws BundleException;
Bundle getBundle(long id);
Bundle[] getBundles();
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void addBundleListener(BundleListener listener);
void removeBundleListener(BundleListener listener);
void addFrameworkListener(FrameworkListener listener);
void removeFrameworkListener(FrameworkListener listener);
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D763'P'O#Q+%;'&9#':Q&9' db'

88. (4,-9)&
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void stop() throws BundleException;
void update() throws BundleException;
void update(InputStream in) throws BundleException;
void uninstall() throws BundleException;
Dictionary getHeaders();
String getSymbolicName();
long getBundleId();
String getLocation();
...
URL getResource(String name);
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D763'P'O#Q+%;'&9#':Q&9' dd'

89. (4,-9)&
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int getState();
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void update(InputStream in) throws BundleException;
void uninstall() throws BundleException;
Dictionary getHeaders();
String getSymbolicName();
long getBundleId();
String getLocation();
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URL getResource(String name);
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90. (4,-9)&
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String getSymbolicName();
long getBundleId();
String getLocation();
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URL getResource(String name);
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String getSymbolicName();
long getBundleId(); Lifecycle method to
String getLocation(); update bundle
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URL getResource(String name);
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D763'P'O#Q+%;'&9#':Q&9' eg'

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void update(InputStream in) throws BundleException;
void uninstall() throws BundleException;
Dictionary getHeaders();
String getSymbolicName();
long getBundleId(); Lifecycle method to
String getLocation(); uninstall bundle
...
URL getResource(String name);
Enumeration getResources(String name) throws IOException;
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D763'P'O#Q+%;'&9#':Q&9' eH'

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void stop() throws BundleException;
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void update(InputStream in) throws BundleException;
void uninstall() throws BundleException;
Dictionary getHeaders();
String getSymbolicName();
long getBundleId(); Access to
String getLocation(); bundle resources
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URL getResource(String name);
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public final static int UPDATED = 0x00000008;
public final static int UNINSTALLED = 0x00000010;
public final static int RESOLVED = 0x00000020;
public final static int UNRESOLVED = 0x00000040;
public final static int STARTING = 0x00000080;
public final static int STOPPING = 0x00000100;
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public Bundle getBundle() { … }
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! G9Qj'
A (C3)8%L'<2%;"#'$/Q<#'<#'2)3%L'*"/))#)'I-+$'&9#'<2%;"#'<#3%L'2=;/&#;'+-'
2%3%)&/""#;'
A !/%%+&'=2""'&9#'-2L'+2&'I-+$'2%;#-';#=#%;#%&'<2%;"#)'
B+&-)29&S$./&./$<E&./)&@:25)S+:7&.:)2.<&4>-2.)&2,-&4,$,<.299&2<&2&.S+c<.)>&
>:+?)<<&
! N=;/&#)'/%;'2%3%)&/"")';+'%+&'9/==#%'3$$#;3/&#"Q'
! @-/$#?+-0'$2)&'<#'k-#I-#)9#;l'&+'=2&'&9#$'3%&+'#p#*&'
A 4*&2/""Q.'I+-'2=;/&#)'3&'3)'/'"3n"#'$+-#'*+$="3*/&#;'&9/%'&93).'<2&'?#'*/%'
/**#=&'&93)'J3#?'I+-'%+?555'
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114. d)@:)</$,A&./)&]:25)S+:7&
e>-2.)&2,-&4,$,<.299&9$@)?*?9)&+>):2;+,<&2:)&2&9$X9)&?+5>9$?2.)-&
! G9Qj'
A (C3)8%L'<2%;"#'$/Q<#'<#'2)3%L'*"/))#)'I-+$'&9#'<2%;"#'<#3%L'2=;/&#;'+-'
2%3%)&/""#;'
A !/%%+&'=2""'&9#'-2L'+2&'I-+$'2%;#-';#=#%;#%&'<2%;"#)'
B+&-)29&S$./&./$<E&./)&@:25)S+:7&.:)2.<&4>-2.)&2,-&4,$,<.299&2<&2&.S+c<.)>&
>:+?)<<&
! N=;/&#)'/%;'2%3%)&/"")';+'%+&'9/==#%'3$$#;3/&#"Q'
! @-/$#?+-0'$2)&'<#'k-#I-#)9#;l'&+'=2&'&9#$'3%&+'#p#*&'
A 4*&2/""Q.'I+-'2=;/&#)'3&'3)'/'"3n"#'$+-#'*+$="3*/&#;'&9/%'&93).'<2&'?#'*/%'
/**#=&'&93)'J3#?'I+-'%+?555'
l+S&-+&S)&:)@:)</&./)&@:25)S+:76&
D763'P'O#Q+%;'&9#':Q&9' ggZ'

115. F2?72A)&D-5$,&
]:25)S+:7&>:+Q$-)<&<>)?$29&DFO&.+&-)29&S$./&34,-9)<&$,.):2?;+,<&
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);
}
D763'P'O#Q+%;'&9#':Q&9' gg]'

116. F2?72A)&D-5$,&
]:25)S+:7&>:+Q$-)<&<>)?$29&DFO&.+&-)29&S$./&34,-9)<&$,.):2?;+,<&
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); various methods
Provides
} to introspect bundle
dependencies
D763'P'O#Q+%;'&9#':Q&9' gg^'

117. F2?72A)&D-5$,&
]:25)S+:7&>:+Q$-)<&<>)?$29&DFO&.+&-)29&S$./&34,-9)<&$,.):2?;+,<&
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);
So, how do we gain
Bundle[] getFragments(Bundle bundle);
access to this API?
RequiredBundle[] getRequiredBundles(String symbolicName);
Bundle[] getHosts(Bundle bundle);
void refreshPackages(Bundle[] bundles);
boolean resolveBundles(Bundle[] bundles);
}
D763'P'O#Q+%;'&9#':Q&9' ggb'

118. D763'P'O#Q+%;'&9#':Q&9' ggd'

119. "):Q$?)&!:$),.2;+,&
B/)&!"#$&@:25)S+:7&>:+5+.)<&2&<):Q$?)c+:$),.)-&$,.):2?;+,&>2X):,&25+,A&
34,-9)<&
D763'P'O#Q+%;'&9#':Q&9' gge'

120. "):Q$?)&!:$),.2;+,&
B/)&!"#$&@:25)S+:7&>:+5+.)<&2&<):Q$?)c+:$),.)-&$,.):2?;+,&>2X):,&25+,A&
34,-9)<&
Service
Registry
D763'P'O#Q+%;'&9#':Q&9' gHh'

121. "):Q$?)&!:$),.2;+,&
B/)&!"#$&@:25)S+:7&>:+5+.)<&2&<):Q$?)c+:$),.)-&$,.):2?;+,&>2X):,&25+,A&
34,-9)<&
Service
Registry
Y,:'51%#
Service
Description
Service
Provider
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122. "):Q$?)&!:$),.2;+,&
B/)&!"#$&@:25)S+:7&>:+5+.)<&2&<):Q$?)c+:$),.)-&$,.):2?;+,&>2X):,&25+,A&
34,-9)<&
Service
Registry
Y,:'51%# 75"J#
Service
Description
Service Service
Provider Requester
D763'P'O#Q+%;'&9#':Q&9' gHH'

123. "):Q$?)&!:$),.2;+,&
B/)&!"#$&@:25)S+:7&>:+5+.)<&2&<):Q$?)c+:$),.)-&$,.):2?;+,&>2X):,&25+,A&
34,-9)<&
Service
Registry
Y,:'51%# 75"J#
Service
Description
Service Service
Provider Requester
R5"J#
D763'P'O#Q+%;'&9#':Q&9' gHR'

124. !"#$&"):Q$?)&D>>:+2?/&D-Q2,.2A)<&
Z$A/.S)$A/.&<):Q$?)<&
! U3-#*&'$#&9+;'3%J+*/8+%'
".:4?.4:)-&?+-)&
! B-+$+&#)')#=/-/8+%'+I'3%&#-I/*#'I-+$'3$="#$#%&/8+%'
! (%/<"#)'-#2)#.')2<)8&2&/<3"3&Q.'"++)#'*+2="3%L.'/%;'"/&#'<3%;3%L'
V*,25$?<&
! T++)#'*+2="3%L'/%;'"/&#'<3%;3%L'$/0#'3&'=+))3<"#'&+')2==+-&'-2%K8$#'
$/%/L#$#%&'+I'$+;2"#'
D763'P'O#Q+%;'&9#':Q&9' gHZ'

125. !"#$&D>>9$?2;+,<&
D&?+99)?;+,&+@&34,-9)<&./2.&$,.):2?.&Q$2&<):Q$?)&$,.):@2?)<&
! O2%;"#)'$/Q'<#'3%;#=#%;#%&"Q';#J#"+=#;'/%;';#="+Q#;'
! O2%;"#)'/%;'&9#3-'/))+*3/&#;')#-J3*#)'$/Q'/==#/-'+-';3)/==#/-'/&'/%Q'8$#'
&
d)<49;,A&2>>9$?2;+,&@+99+S<&2&"):Q$?)c!:$),.)-&=+5>+,),.&0+-)9&2>>:+2?/&
! !+$<3%#)'3;#/)'I-+$'<+&9'*+$=+%#%&'/%;')#-J3*#'+-3#%&/8+%'
D763'P'O#Q+%;'&9#':Q&9' gH]'

126. (4,-9)&Z$@)&=*?9)&`d)Q$<$.)-b&
5"1$(''#
INSTALLED
,"5"1$(''# )&1.'8&# ,4J($&#
,"5"1$(''#
UNINSTALLED RESOLVED
1$()$#
STARTING STOPPING
&M4'5E5$# 1$.4#
(,$.;(XE#
ACTIVE
D763'P'O#Q+%;'&9#':Q&9' gH^'

127. (4,-9)&Z$@)&=*?9)&`d)Q$<$.)-b&
5"1$(''#
INSTALLED
@?-*"-./'"'=8.$9&'"99<%2')3'
,"5"1$(''# )&1.'8&# ,4J($&#
3<',#<*)$&'".$'82&'2&#*)?&2'
,"5"1$(''#
UNINSTALLED RESOLVED
1$()$#
STARTING STOPPING
&M4'5E5$# 1$.4#
(,$.;(XE#
ACTIVE
D763'P'O#Q+%;'&9#':Q&9' gHb'

128. 1/2.k<&2&"):Q$?)6&
U4<.&2&<$5>9)&U2Q2&+3G)?.&
B*>$?299*&-)<?:$3)-&3*&2&U2Q2&$,.):@2?)&
! 4""+?)'I+-'$2"8="#'=-+J3;#-)'
e<$,A&2&<):Q$?)&$<&G4<.&9$7)&4<$,A&2,*&+3G)?.&
D763'P'O#Q+%;'&9#':Q&9' gHd'

129. l)99+&1+:9-&"):Q$?)&P25>9)&
Z).k<&2<<45)&S)&/2Q)&./$<&<):Q$?)&$,.):@2?)&
& package com.foo.hello;
public interface Hello {
& void sayHello(String name);
}
D763'P'O#Q+%;'&9#':Q&9' gHe'

130. l)99+&1+:9-&"):Q$?)&P25>9)&
Z).k<&2<<45)&S)&/2Q)&./$<&<):Q$?)&$,.):@2?)&
& package com.foo.hello;
public interface Hello {
& void sayHello(String name);
}
&
D,-&./$<&$5>9)5),.2;+,&
package com.foo.hello.impl;
import com.foo.hello;
public class HelloImpl implements Hello {
public void sayHello(String name) {
System.out.println("Hello " + name + "!");
}
}
D763'P'O#Q+%;'&9#':Q&9' gRh'

131. F439$</$,A&2&"):Q$?)&`KaIb&
(4,-9)=+,.).&299+S<&34,-9)<&.+&>439$</&<):Q$?)<&
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);
}
D763'P'O#Q+%;'&9#':Q&9' gRg'

132. F439$</$,A&2&"):Q$?)&`KaIb&
(4,-9)=+,.).&299+S<&34,-9)<&.+&>439$</&<):Q$?)<&
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(Stringhave two methods
We clazz);
for publishing services
Object getService(ServiceReference reference);
boolean ungetService(ServiceReference reference);
}
D763'P'O#Q+%;'&9#':Q&9' gRH'

133. F439$</$,A&2&"):Q$?)&`IaIb&
(4,-9)<&+R),&>439$</&<):Q$?)<&$,&./)$:&2?;Q2.+:&
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();
}
}
D763'P'O#Q+%;'&9#':Q&9' gRR'

134. F439$</$,A&2&"):Q$?)&`IaIb&
(4,-9)<&+R),&>439$</&<):Q$?)<&$,&./)$:&2?;Q2.+:&
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
D763'P'O#Q+%;'&9#':Q&9' gRZ'

135. F439$</$,A&2&"):Q$?)&`IaIb&
(4,-9)<&+R),&>439$</&<):Q$?)<&$,&./)$:&2?;Q2.+:&
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
D763'P'O#Q+%;'&9#':Q&9' gR]'

136. F2?72A$,A&./)&l)99+&1+:9-&"):Q$?)&
!4:&<):Q$?)&$5>9)5),.2;+,&34,-9)&?+,.2$,<&./)<)&>2?72A)<&
! *+$5I++59#""+'
! *+$5I++59#""+53$="'
D763'P'O#Q+%;'&9#':Q&9' gR^'

137. F2?72A$,A&./)&l)99+&1+:9-&"):Q$?)&
!4:&<):Q$?)&$5>9)5),.2;+,&34,-9)&?+,.2$,<&./)<)&>2?72A)<&
! *+$5I++59#""+'
! *+$5I++59#""+53$="'
D,-&./)&@+99+S$,A&52,$@)<.&5).2-2.2&
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
D763'P'O#Q+%;'&9#':Q&9' gRb'

138. e<$,A&2&"):Q$?)&`KaIb&
(4,-9)=+,.).&299+S<&34,-9)<&.+&_,-&<):Q$?)<&
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);
}
D763'P'O#Q+%;'&9#':Q&9' gRd'

139. e<$,A&2&"):Q$?)&`KaIb&
(4,-9)=+,.).&299+S<&34,-9)<&.+&_,-&<):Q$?)<&
public interface BundleContext {
…
void addServiceListener(ServiceListener listener, String
filter)
throws InvalidSyntaxException;
void addServiceListener(ServiceListener listener);
void removeServiceListener(ServiceListener We have methods to find
listener);
ServiceRegistration registerService( service references and get
String[] clazzes, Object service, Dictionary service objects
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);
}
D763'P'O#Q+%;'&9#':Q&9' gRe'

140. e<$,A&2&"):Q$?)&`IaIb&
(4,-9)<&:).:$)Q)&<):Q$?)&:)@):),?)<&
! V%;3-#*&'-#I#-#%*#)'&+')#-J3*#'+<F#*&'
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);
}
}
}
…
}
D763'P'O#Q+%;'&9#':Q&9' gZh'

141. e<$,A&2&"):Q$?)&`IaIb&
(4,-9)<&:).:$)Q)&<):Q$?)&:)@):),?)<&
! V%;3-#*&'-#I#-#%*#)'&+')#-J3*#'+<F#*&'
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
…
}
D763'P'O#Q+%;'&9#':Q&9' gZg'

142. e<$,A&2&"):Q$?)&`IaIb&
(4,-9)<&:).:$)Q)&<):Q$?)&:)@):),?)<&
! V%;3-#*&'-#I#-#%*#)'&+')#-J3*#'+<F#*&'
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
D763'P'O#Q+%;'&9#':Q&9' gZH'

143. e<$,A&2&"):Q$?)&`IaIb&
(4,-9)<&:).:$)Q)&<):Q$?)&:)@):),?)<&
! V%;3-#*&'-#I#-#%*#)'&+')#-J3*#'+<F#*&'
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
D763'P'O#Q+%;'&9#':Q&9' gZR'

144. e<$,A&2&"):Q$?)&`IaIb&
(4,-9)<&:).:$)Q)&<):Q$?)&:)@):),?)<&
! V%;3-#*&'-#I#-#%*#)'&+')#-J3*#'+<F#*&'
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
D763'P'O#Q+%;'&9#':Q&9' gZZ'

145. F2?72A$,A&./)&l)99+&1+:9-&"):Q$?)&
!4:&?9$),.&$5>9)5),.2;+,&34,-9)&?+,.2$,<&./$<&>2?72A)&
! *+$5I++59#""+5*"3#%&'
D,-&./)&@+99+S$,A&52,$@)<.&5).2-2.2&
Bundle-ManifestVersion: 2
Bundle-SymbolicName: com.foo.hello.client
Import-Package: com.foo.hello,
org.osgi.framework
Bundle-Activator: com.foo.hello.client.Activator
D763'P'O#Q+%;'&9#':Q&9' gZ]'

146. "):Q$?)&V*,25$<5&
"):Q$?)<&?2,&3)&>439$</)-&2,-&:)Q+7)-&2.&:4,&;5)&
! 7#-J3*#'#J#%&)')3L%/"')#-J3*#'*9/%L#)'
A :2)&'&-/*0'#J#%&)'I+-'/%Q')#-J3*#)'<#3%L'2)#;'
N.#'51$&"#D.)#&8&"$1#
BundleContext.addServiceListener()
D763'P'O#Q+%;'&9#':Q&9' gZ^'

147. "):Q$?)<&V*,25$<5&
"):Q$?)<&?2,&3)&>439$</)-&2,-&:)Q+7)-&2.&:4,&;5)&
! 7#-J3*#'#J#%&)')3L%/"')#-J3*#'*9/%L#)'
A :2)&'&-/*0'#J#%&)'I+-'/%Q')#-J3*#)'<#3%L'2)#;'
!;4'&;&"$#'51$&"&)#5"$&)D(E&#
public interface ServiceListener extends EventListener {
public void serviceChanged(ServiceEvent event);
}
D763'P'O#Q+%;'&9#':Q&9' gZb'

148. "):Q$?)<&V*,25$<5&
"):Q$?)<&?2,&3)&>439$</)-&2,-&:)Q+7)-&2.&:4,&;5)&
! 7#-J3*#'#J#%&)')3L%/"')#-J3*#'*9/%L#)'
A :2)&'&-/*0'#J#%&)'I+-'/%Q')#-J3*#)'<#3%L'2)#;'
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() { … }
}
D763'P'O#Q+%;'&9#':Q&9' gZd'

149. "):Q$?)<&V*,25$<5&
"):Q$?)<&?2,&3)&>439$</)-&2,-&:)Q+7)-&2.&:4,&;5)&
! 7#-J3*#'#J#%&)')3L%/"')#-J3*#'*9/%L#)'
A :2)&'&-/*0'#J#%&)'I+-'/%Q')#-J3*#)'<#3%L'2)#;'
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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@Provides
public class Circle implements SimpleShape {
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private String name;
@ServiceProperty(name=SimpleShape.ICON_PROPERTY)
private ImageIcon icon;
@Validate
public void start() {
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}
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