5. … or is it?
SAN MATEO, Calif.—November 19, 2008 –
SpringSource, a leading provider of infrastructure
software and the company behind Spring, the de facto
standard in enterprise Java, today announced that
results from an extensive Evans Data research study
reveal large scale adoption and penetration of Spring
as a means of increasing developer productivity and
combating complexity in today’s enterprise
application infrastructure market.
5
6. Java Nodes in the Cloud
3 Billion Java-Enabled Cards in 2007
●
1.8 Billion Java-Enabled Phones in 2007
●
7 Million Java Set-top Boxes
●
1 Million GWT downloads in 2007
●
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8. We the people
“We hold these truths to be self-evident, that all
men are created equal, that they are endowed by
their Creator with certain unalienable Rights, that
among these are Life, Liberty, and the Pursuit of
Happiness.”
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9. We the people
“We hold these truths to be self-evident, that all
men... Java Developers are enttled to get their
porton of Spring goodness.”
Not just Java EE developers
Not just Java SE developers
But also Java ME developers
And Java Card developers
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10. Why Spring?
All Spring's goodness summarized in
famous last words
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11. IoC Container
“Trust us, we know what we're doing.”
“Don't call us, we call you.”
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12. Sanitized API
“Any problem in computer science can be solved
with another layer of indirecton.”
– David Wheeler
14. So why not use Spring itself?
Platorm Limitatons
● Limited Java Runtme capabilites
● Limitatons imposed by deployment
● Limited computatonal resources
Limitatons on heap
–
Limitatons on applicaton size
–
Limitatons on performance
–
15. Java Runtime Limitations
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s.f ss.n er j a.la r ut
a.
as la a
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Ot
Cl ch ja
ja
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GWT n n n y y y
Java ME y y n y y n
Java Card n n n n n n
BeanFactory#getBean(String name)?
BeanFactory#getBean(char[] name)?
16. Deployment Limitations (1)
<bean id=”movie1” class=”sample.Movie”>
<property name=”title” value=”Into the Wild”/>
1
</bean>
OBFUSCATION
package a.b;
package com.mgm;
public class a {
public class Movie {
void a(String ...);
void setTitle(String title);
}
}
2 3
<bean id=”movie1” class=”a.b.a”>
<property name=”a” value=”Into the Wild”/>
</bean>
4
18. Computational Resources (1)
Heap:
●
Java SE
●
Max heap approx. 1.5 GB
–
Java ME
●
Lower bound max. heap: 140 KB
–
Upper bound max. heap: 128 MB
–
Between factor 11 and 11,714 diference
–
Java Card
●
16 K RAM
–
19. Computational Resources (2)
Applicaton size:
●
Java ME: Upperbounds between 64 KB and 28 MB
●
Spring Core 267KB
Spring Beans 467KB
Spring Context 455KB
Total 1189KB
20. Throughput
Nokia E71:
●
369 MHz ARM 11 CPU
–
Gameboy Advance
●
16 MHz ARM 7 CPU
–
C-Ray Raytracing Benchmark 296108 s
–
Dell PowerEdge M710
●
2.4 GHz Xeon Quad Core CPU
–
C-Ray Raytracing Benchmark 201 s
–
25. … And with the Maven plugin
<project>
<build>
<plugins>
<plugin>
<groupId>me.springframework</groupId>
<artifactId>spring-me-maven-plugin</artifactId>
<version>1.0-SNAPSHOT</version>
<executions>
<execution>
<goals>
<goal>generate</goal>
</goals>
<configuration>
<contextFile>....context.xml</contextFile>
<className>com.mgm.BeanFactory</className>
</configuration>
</execution>
</executions>
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26. You get this BeanFactory
public class BeanFactory {
public Object getBean(String name) {
if (“movieFinder”.equals(name)) {
return getMovieFinder();
}
}
private final Object getMovieFinder() { … }
…
}
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27. DEMO
Spring ME on Java SE
●
Spring ME on Java ME
●
Spring ME on GWT
●
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28. Spring ME
Compile tme validaton
●
“Is 10e2 a valid int representaton?”
–
“Is an instance of Boeing747 assignable to a
–
property of type Airplane?”
Minimal or no runtme dependencies
●
Superfast (but no benchmarks to verify this)
●
Small (1K?)
●
30. Spring ME Meta Model
Meta Model independent of Spring
●
Typically Spring XML confguraton is used
●
Meta Model supports other sources
●
Spring XML Spring ME
Spring ME
Configuration BeanFactory
Meta Model
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31. Other sources?
@Autowired @ProvidedBy
@PostConstruct @Inject
@PostDestroy @ImplementedBy
Annotations
Spring ME
Spring ME
BeanFactory
Meta Model
Spring XML
Configuration 31
34. If not Spring ME, then what?
GWT
●
Java Card
●
GWToolbox
–
None
–
Rocket GWT
–
(Spring ME?)
–
GIN
–
Java ME
●
Spring ME
–
Signal
–
Suco
–
Israfl IoC
–
Fall ME
–
Spring ME
–
35. Inversion of Control Galore
x
ion rs nta
at y n
ur olde t S tio n
n ig
jec ctio
s o n
od rati onf ceh plia
od in
h
h
et od met figu on c pla om s* tor inje
s es g
n
E ton yp m th y io truc rty me e irin
n ati rty C
y o t
T va M gle otot zy ger ctor t me stro L c not ope ring as llec ns ope na typ tow
i
n i
W
G Ja Si Pr La Ea Fa In De XM An Pr Sp Al Co Co Pr By By Au
Rocket GWT y n y y y y y y y y n y n n all y y y n ?
Spring ME y y y y y y y y y y n n y n l/m y y y y ...
Israfil IoC n y y n n n n n n n n n n n ... y n n y y
Fall ME n y y n n n n n n n n n n n ... y n n n n
GWToolbox y n y y y y ? y y n y y n n all n y n y y
Signal n n y y n n ? n n n y n y n all n y y ? ?
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36. The Rest: Sanitized API
Java ME needs a lot more sanity
●
J2ME Polish is your friend
–
Java Card is probably too limited to use
●
wrapper API
GWT is already addressed by a lot of
●
frameworks
36
37. The Rest: AOP?
What about it?
●
Using the metadata, proxies could be
●
constructed at build tme
The factory could construct these proxies
●
instead of the actual objects
37
38. Current status
'Request' scope
●
'Session' scope
●
'Global session' scope
●
BeanFactoryAware, but ...
●
BeanPostProcessor (without refecton?)
●
BeanFactoryPostProcessor, but ...
●
FactoryBean, but ...
●
38
39. If there's only one thing
“ME” as in “supportng Java ME”
●
“ME” as in “a microscopic small version of
●
Spring”
Useful for Java ME
●
Useful for GWT
●
Useful for Java SE
●
Potentally useful for Java Card and Java EE
●
39
40. Roadmap
Version 1.0 (J109 release) end of May 2009
●
Integraton with J2ME Polish
●
BOF-4470, June 4, JavaOne
●
htp://springframework.me/
●
spring-me@googlegroups.com
●
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