A zen presentation about the process we call modularity. Showing how we apply the same pattern to software over and over, resulting in the latest incarnation: µservices.

1. µServices
By Peter Kriens
OSGi Technical Director & Evangelist
1dinsdag 9 november 2010

2. In the beginnings there
were bits ...
2dinsdag 9 november 2010

3. 0100111100110010000000001111000
0001000010001110010100000010011
1000100011011111100010001110111
1101101001000010011101000000111
1110000010100000110111000010000
0110110100000001100100010001110
10000001110110
Bits
3dinsdag 9 november 2010

4. 0100111100110010000000001111000
0001000010001110010100000010011
1000100011011111100010001110111
1101101001000010011101000000111
1110000010100000110111000010000
0110110100000001100100010001110
10000001110110
Bits
3dinsdag 9 november 2010

5. 117
062
000
360
041
034
240
116
043
176
043
276
322
023
240
176
012
015
302
015
240
062
043
240
166
Octal
4dinsdag 9 november 2010

6. 4F
32 00 F0
21 1C A0
4E
23
7E
23
BE
D2 13 A0
7E
0A
0D
C2 0D A0
32 23 A0
76
Hex
5dinsdag 9 november 2010

7. Code MOV C,A
STA F000H
LXI H,A01CH
MOV C,M
INX H
MOV A,M
INX H
CMP M
JNC A013H
MOV A,M
DCR C
JNZ A00DH
STA A023H
HLT
6dinsdag 9 november 2010

8. Code MOV C,A
STA F000H
LXI H,A01CH
MOV C,M
INX H
MOV A,M
INX H
CMP M
JNC A013H
MOV A,M
DCR C
JNZ A00DH
STA A023H
HLT
6dinsdag 9 november 2010

9. Code
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
7dinsdag 9 november 2010

10. Code
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
7dinsdag 9 november 2010

11. int global;
int shared;
int local;
Code
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
7dinsdag 9 november 2010

12. int global;
int shared;
int local;
Functions
void foo() {
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
8dinsdag 9 november 2010

13. int global;
int shared;
int local;
Functions
void foo() {
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
8dinsdag 9 november 2010

14. int global;
int shared;
int local;
Functions
void foo() {
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
void bar() {
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
9dinsdag 9 november 2010

15. int global;
int shared;
Functions
void foo() {
int local
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
void bar() {
int local;
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
10dinsdag 9 november 2010

16. A
int global;
int shared;
Modules
B
void foo() {
int local
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
void foo() {
int local
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
11dinsdag 9 november 2010

17. A
int global;
int shared;
Modules
B
void foo() {
int local
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
void foo() {
int local
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
11dinsdag 9 november 2010

18. A
int global;
Modules
B
int shared;
int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
void foo() {
int local
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
12dinsdag 9 november 2010

19. Class A
Objects
Class B
int shared;
int shared;
1
n
void foo() {
int local
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
void foo() {
int local
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
13dinsdag 9 november 2010

20. Class A
Objects
Class B
int shared;
int shared;
1
n
void foo() {
int local
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
void foo() {
int local
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local++)
shared *= 10;
}
13dinsdag 9 november 2010

21. com.acme.abc
Packages
com.acme.def
Class A int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local+
+)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local+
+)
shared *= 10;
}
Class B int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local+
+)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local+
+)
shared *= 10;
}
Class A int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local+
+)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local+
+)
shared *= 10;
}
Class C int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local+
+)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local+
+)
shared *= 10;
}
14dinsdag 9 november 2010

22. com.acme.abc
Packages
com.acme.def
Class A int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local+
+)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local+
+)
shared *= 10;
}
Class B int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local+
+)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local+
+)
shared *= 10;
}
Class A int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local+
+)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local+
+)
shared *= 10;
}
Class C int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local+
+)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local+
+)
shared *= 10;
}
14dinsdag 9 november 2010

23. “Chapter 7 describes the structure of a
program which is organized into packages
similar to the modules of Modula.”
Java Language Specification, 3rd edition
15dinsdag 9 november 2010

24. abc-1.2.3-SNAPSHOT.jar
JARs
com.acme.abc
Class A int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
Class B int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
com.acme.def
Class A int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
Class B int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
def-4.5.6.jar
com.acme.abc
Class A int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
Class B int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
com.acme.ghi
Class A int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
Class B int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
16dinsdag 9 november 2010

25. abc-1.2.3-SNAPSHOT.jar
JARs
com.acme.abc
Class A int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
Class B int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
com.acme.def
Class A int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
Class B int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
def-4.5.6.jar
com.acme.abc
Class A int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
Class B int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
com.acme.ghi
Class A int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
Class B int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
16dinsdag 9 november 2010

26. com.acme.abc-1.2.3
Bundles
com.acme.abc
Class A int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
Class B int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
com.acme.def-9.9.1
com.acme.abc
Class A int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
Class B int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
com.acme.def
Class A int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
Class B int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
com.acme.ghi
Class A int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
Class B int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
17dinsdag 9 november 2010

27. com.acme.abc-1.2.3
Bundles
com.acme.abc
Class A int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
Class B int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
com.acme.def-9.9.1
com.acme.abc
Class A int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
Class B int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
com.acme.def
Class A int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
Class B int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
com.acme.ghi
Class A int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void bar() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
Class B int shared;
void foo() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
void xyz() {
int local
global = shared;
for (local=0;
local<10; local
++)
shared *= 10;
}
Private Exported
Private Exported
17dinsdag 9 november 2010

28. The Face of Modularity
18dinsdag 9 november 2010

29. The Face of Modularity
18dinsdag 9 november 2010

30. Archetype of Modularity
EXPORT
IMPORT
PRIVATE
EXPORT
IMPORT
PRIVATE
19dinsdag 9 november 2010

31. A B
C D
• modules have a private
space and share a
public space
• modules limit their
visibility and exposure
• From geometric to
linear complexity
Modularity’s Secret
20dinsdag 9 november 2010

32. A B
C D
• modules have a private
space and share a
public space
• modules limit their
visibility and exposure
• From geometric to
linear complexity
Modularity’s Secret
Pub
20dinsdag 9 november 2010

33. A B
C D
• modules have a private
space and share a
public space
• modules limit their
visibility and exposure
• From geometric to
linear complexity
Modularity’s Secret
Pub
20dinsdag 9 november 2010

34. A B
C D
• Modules require other
modules
• Dependencies are
transitive
• A → C → D
Coupling
Pub
21dinsdag 9 november 2010

35. A B
C D
• Modules require other
modules
• Dependencies are
transitive
• A → C → D
Coupling
Pub
21dinsdag 9 november 2010

36. Evolution
• Modularization is about minimizing the changes
need to support the evolution of itself and its
dependencies.
• Module change should only be required for:
• New functionality
• An embedded assumption is violated
• Ergo: assumptions about other modules should be
minimized
22dinsdag 9 november 2010

37. What Happens When
You’re Inflexible?
23dinsdag 9 november 2010

38. Things break ...
24dinsdag 9 november 2010

39. Inflexibility!
25dinsdag 9 november 2010

40. Module friction is:
Depending on hard to
maintain assumptions
about other modules
26dinsdag 9 november 2010

41. Module Friction
A
B
27dinsdag 9 november 2010

42. Module Friction
A
B
27dinsdag 9 november 2010

43. Why Break A?
A
B
CA
B
28dinsdag 9 november 2010

44. Why Break A?
A
B
CA
B
28dinsdag 9 november 2010

45. Module Friction
A
B
29dinsdag 9 november 2010

46. Because we can … ?
30dinsdag 9 november 2010

47. POJO Programming is
Best Practice
31dinsdag 9 november 2010

48. Interfaces/API
Con-
sumer
ProviderInterface
32dinsdag 9 november 2010

49. Access to Impls.
Con-
sumer
ProviderInterface
33dinsdag 9 november 2010

50. Access to Impls.
Con-
sumer
ProviderInterface
X
33dinsdag 9 november 2010

51. Factory Pattern
Con-
sumer
ProviderInterface
Factory
Class
uses
Active Passive
impls
34dinsdag 9 november 2010

52. Factory Pattern
Con-
sumer
ProviderInterface
Factory
Class
uses
Active Passive
impls
?
34dinsdag 9 november 2010

53. Listener Pattern
Con-
sumer
ProviderInterface
Provider
Admin
Interface
Passive Active
impls uses
impls
35dinsdag 9 november 2010

54. Dependency Injection
Con-
sumer
ProviderInterface
Depen-
dency
Injection
Passive Passive
36dinsdag 9 november 2010

55. Patterns
Passive Active
Passive
Dependency
Injection
Listener
Active Factory
?
Consumer
Provider
37dinsdag 9 november 2010

56. ?
Con-
sumer
ProviderInterface
?
Active Active
38dinsdag 9 november 2010

57. Patterns
Passive Active
Passive
Dependency
Injection
Listener
Active Factory ?
Consumer
Provider
39dinsdag 9 november 2010

58. Patterns
Passive Active
Passive
Active
Consumer
Provider
40dinsdag 9 november 2010

59. µServices
Con-
sumer
ProviderInterface
OSGi
µServices
Active Active
41dinsdag 9 november 2010

60. Module Friction?
42dinsdag 9 november 2010

61. Module Friction?
Speak
42dinsdag 9 november 2010

62. Module Friction?
Talker Mac
Speak
Speak
42dinsdag 9 november 2010

63. Module Friction
Talker Speak
Mac
Speak
43dinsdag 9 november 2010

64. Services
Talker
Mac
Speak
Speak
44dinsdag 9 november 2010

65. Basic
Talker
Mac
Speak
45dinsdag 9 november 2010

66. aQute.service.speak
Basic
Talker
Mac
Speak
public interface Speak {
void say(String s);
}
45dinsdag 9 november 2010

67. aQute.service.speak
Basic
Talker
Mac
Speak
public interface Speak {
void say(String s);
}
1. Register a SpeakImpl
instance
45dinsdag 9 november 2010

68. aQute.service.speak
Basic
Talker
Mac
Speak
public interface Speak {
void say(String s);
}
1. Register a SpeakImpl
instance
2. notify
45dinsdag 9 november 2010

69. aQute.service.speak
Basic
Talker
Mac
Speak
public interface Speak {
void say(String s);
}
1. Register a SpeakImpl
instance
3. Get a Speak
instance
2. notify
45dinsdag 9 november 2010

70. aQute.service.speak
Basic
Talker
Mac
Speak
public interface Speak {
void say(String s);
}
1. Register a SpeakImpl
instance
3. Get a Speak
instance
4. instance.say(“Hello”)
2. notify
45dinsdag 9 november 2010

71. All Good
• The provider creates the instance
• Life cycle control in the hands of the
implementer
• No Statics
• Full context defined by implementer
• Type Safe
• Discovery by User
46dinsdag 9 november 2010

72. Services
User
Imple-
menter
S
47dinsdag 9 november 2010

73. Services
User
Imple-
menter
S
register
47dinsdag 9 november 2010

74. Services
User
Imple-
menter
S
get register
47dinsdag 9 november 2010

75. Services
User
Imple-
menter
S
get register
Service
Listener
service
listener
47dinsdag 9 november 2010

76. Services
User
Imple-
menter
S
get register
Service
Hooker
Service
Listener
service
hooks
service
listener
47dinsdag 9 november 2010

77. Cardinality
User
Imple-
menter
S
Service
Hooker
Service
Listener
n m m n nn
n
m
m
n
48dinsdag 9 november 2010

78. Factory Pattern
Con-
sumer
Provider
Active Passive
49dinsdag 9 november 2010

79. Listener Pattern
Con-
sumer
Provider
Passive Active
50dinsdag 9 november 2010

80. Dependency Pattern
Depends
On
B
A
C
51dinsdag 9 november 2010

81. Discovery Pattern
Discovers B
A
C
52dinsdag 9 november 2010

82. Variations
Talker Mac
Speak
Speak
Shell
Console
Shell
Command
Servlet
Web
Console
Jetty
Http
Server
53dinsdag 9 november 2010

83. The new Shell
Command
Processor
Aggregate
Converter
Thread IO
Aggregate
Formatter
Formatter
Converter
…
Handler
…
Commands
ThreadIO
osgi.command.scope=…
osgi.command.function=...
Command
Processor
Aggregate
Converter
Aggregate
Formatter
Formatter
Converter
54dinsdag 9 november 2010

84. Distributed OSGi
Distribution
Provider
Distribution
Provider
X’
Bundle
B
Framework 1 Framework 2
55dinsdag 9 november 2010

85. Distributed OSGi
X
Distribution
Provider
Distribution
Provider
X’
Bundle
B
Framework 1 Framework 2
55dinsdag 9 november 2010

86. Distributed OSGi
Bundle
A
X
Distribution
Provider
Distribution
Provider
X’
Bundle
B
Framework 1 Framework 2
55dinsdag 9 november 2010

87. Distributed OSGi
Bundle
A
X
Distribution
Provider
Distribution
Provider
X’
Bundle
B
Framework 1 Framework 2
55dinsdag 9 november 2010

88. Distributed OSGi
Bundle
A
X
Distribution
Provider
Distribution
Provider
X’
Bundle
B
Framework 1 Framework 2
55dinsdag 9 november 2010

89. Distributed OSGi
Bundle
A
X
Distribution
Provider
Distribution
Provider
X’
Bundle
B
exports
service
Framework 1 Framework 2
55dinsdag 9 november 2010

90. Distributed OSGi
Bundle
A
X
Distribution
Provider
Distribution
Provider
X’
Bundle
B
exports
service
Framework 1 Framework 2
55dinsdag 9 november 2010

91. Distributed OSGi
Bundle
A
X
Distribution
Provider
Distribution
Provider
X’
Bundle
B
exports
service
Framework 1 Framework 2
55dinsdag 9 november 2010

92. Distributed OSGi
Bundle
A
X
Distribution
Provider
Distribution
Provider
X’
Bundle
B
exports
service
Framework 1 Framework 2
55dinsdag 9 november 2010

93. Distributed OSGi
Bundle
A
X
Distribution
Provider
Distribution
Provider
X’
Bundle
B
exports
service
imports
service
Framework 1 Framework 2
55dinsdag 9 november 2010

94. Distributed OSGi
Bundle
A
X
Distribution
Provider
Distribution
Provider
X’
Bundle
B
exports
service
imports
service
Framework 1 Framework 2
55dinsdag 9 november 2010

95. Distributed OSGi
Bundle
A
X
Distribution
Provider
Distribution
Provider
X’
Bundle
B
exports
service
imports
service
Framework 1 Framework 2
55dinsdag 9 november 2010

96. Distributed OSGi
Bundle
A
X
Distribution
Provider
Distribution
Provider
X’
Bundle
B
exports
service
imports
service
Framework 1 Framework 2
55dinsdag 9 november 2010

97. Distributed OSGi
Bundle
A
X
Distribution
Provider
Distribution
Provider
X’
Bundle
B
exports
service
imports
service
Framework 1 Framework 2
55dinsdag 9 november 2010

98. 56dinsdag 9 november 2010

99. 57dinsdag 9 november 2010

100. Conclusion
• µServices are a primitive for:
• dependency handling
• dynamics
• discovery
• hiding the implementations
• µServices provide a primitive solution to common
software problems
• µServices require virtually no code to handle
58dinsdag 9 november 2010

101. Conclusion
A B C
D ? E
F G H
59dinsdag 9 november 2010

102. Conclusion
A B C
D ? E
F G H
59dinsdag 9 november 2010

103. Conclusion
B C
D ? E
F G H
A
60dinsdag 9 november 2010

104. Conclusion
B C
D ? E
F G H
A
60dinsdag 9 november 2010

105. Conclusion
B C
D ? E
F G H
A
60dinsdag 9 november 2010

106. Conclusion
D
C
F G
A B
E
H
D
61dinsdag 9 november 2010

107. Conclusion
D
C
F G
A B
E
H
Yes!D
61dinsdag 9 november 2010

108. Conclusion
D
C
F G
A B
E
H
Yes!D
X
61dinsdag 9 november 2010

109. Q&A
Masterclass on OSGi
www.aqute.biz/MasterClass
USA Bay Area
18-21 January 2011
OSGi DevCon
www.osgi.org/DevCon2011
Santa Clara, CA
21-24 March 2011
62dinsdag 9 november 2010