osgi and the enterprise a match made in a box? · pdf fileseptember 23rd 2010 11 java vm log4j...
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Holly Cumminscumminsh@apache.orgJUG StuttgartSept 23, 2010
2September 23rd 2010
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0101011101001001010010010011011101101101101
3September 23rd 2010
AAAAAA ((((((vvvvvveeeeeerrrrrryyyyyy)))))) bbbbbbrrrrrriiiiiieeeeeeffffff hhhhhhiiiiiissssssttttttoooooorrrrrryyyyyy ooooooffffff pppppprrrrrrooooooggggggrrrrrraaaaaammmmmmmmmmmmiiiiiinnnnnnggggggThen came words ...
mov ah,9mov dx,offset hello_messageint 21h
4September 23rd 2010
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#include <stdio.h>main() {
printf ("Hello World!\n");}
5September 23rd 2010
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public class HelloWorldSayer {
public void sayHello() { System.out.println("Hello, world!\n"); }}
6September 23rd 2010
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<service ref="helloservice" interface="helloworld.HelloWorldService" />
public class HelloWorldClient {HelloWorldService service =
null;public void startUp() {
service.hello();}
}
7September 23rd 2010
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8September 23rd 2010
IDL JDBC JNDI JAXP JAAS JMX RMI-IIOP
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Servlet JSP
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Indirect (soft) dependencyJA
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JASP
IC
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DI
9September 23rd 2010
IDL JDBC JNDI JAXP JAAS JMX RMI-IIOP
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StAX
Indirect (soft) dependencyJA
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JASP
IC
CDI &
DI
((((((ccccccaaaaaappppppaaaaaabbbbbbiiiiiilllllliiiiiittttttyyyyyy ============ bbbbbbllllllooooooaaaaaatttttt))))))??????
HTTP Session Replication Connection Management Persistence Providers User Registries Event Mgmt
Logging and Tracing MBean Server Admin Consoleand scripting
DataSources Messaging Engines Security
Transport Channels Workload Management HTTP Servingand routing
High AvailabilityManagement
Transaction Loggingand Recovery
Thread management Classloading Provisioning Monitoring Policy and SLAmgmt Configuration
………………
10September 23rd 2010
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HTTP Session Replication Connection Management Persistence Providers User Registries Event Mgmt
Logging and Tracing MBean Server Admin Consoleand scripting
DataSources Messaging Engines Security
Transport Channels Workload Management HTTP Servingand routing
High AvailabilityManagement
Transaction Loggingand Recovery
Thread management Classloading Provisioning Monitoring Policy and SLAmgmt Configuration
………………
Batch Telephony BPM DynamicScripting
SCA BusinessRules
Complex EventProcessing
………………
11September 23rd 2010
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12September 23rd 2010
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• OSGi is almost essential in this kind of situation
13September 23rd 2010
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• A Bundle is a special jar• Each bundle has a classloader• Bundles define
• required packages• provided packages
• Packages can be versioned
Bundle
14September 23rd 2010
TTTTTThhhhhheeeeee NaNaNaNaNaNarrrrrrrrrrrroooooowwwwww CCCCCCllllllaaaaaassssssssssssppppppaaaaaatttttthhhhhh
• Bundles wired together• Following a wire is quick• If an endpoint isn't there you
know about it!
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Useful library B
Useful library A
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Ourjar
15September 23rd 2010
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web app
Useful library A
Useful library B
common library v1
common library v2
16September 23rd 2010
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web app
Useful library A
Useful library B
common library v1
common library v2
17September 23rd 2010
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web app
Useful library B
common library v1
common library v2
Useful library A
18September 23rd 2010
EEEEEEAAAAAARRRRRRssssss aaaaaannnnnndddddd cccccclalalalalalassssssssssssppppppaaaaaatttttthhhhhhssssss• Run multiple apps on a server• Common libraries in each war
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19September 23rd 2010
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20September 23rd 2010
LLLLLLoooooooooooosssssseeeeee ccccccoooooouuuuuupppppplllllliiiiiinnnnnngggggg
• Modern enterprise architectures are all loosely coupled• In some way or another!
• JNDI• Web services• Dependency injection• OSGi services
21September 23rd 2010
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• Services registered in Service Registry. • Services are dynamic
S
22September 23rd 2010
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• Historically OSGi and JEE have not played well together• Had to choose one and stick to it
23September 23rd 2010
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• Release date – 22 March 2010• The product of the OSGi Enterprise Expert Group (EEG)
• Brings popular Java EE technologies and OSGi together• Web Apps - Servlets + OSGi• JPA
• Adds Spring-derived component model and DI container• Blueprint
24September 23rd 2010
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• Integrations for • Dependency injection (“blueprint”)• Dependency injection of OSGi services• JPA• JTA• JMX• JNDI
• Open source extensions include ...• Container-managed transactions• Application assembly• Application deployment
September 23rd 2010
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public class Bean {
private LogService log;void setLog(LogService logService) {
log = logService;}
void process(Order o) {log.log(LOG_INFO, “processing: “ + o);}
}
<blueprint> <bean id=”shop” class=”org.example.ecomm.Bean”> <property name=”log”> <reference interface=”org.osgi.service.log.LogService”/> </property> </bean></blueprint>
26September 23rd 2010
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specifications• Just completed 2nd release. • Project was 1 year old last week!
Eclipse “Gemini” Enterprise Modules Projecthttp://www.eclipse.org/gemini/• Modular implementations of Enterprise OSGi
specifications
27September 23rd 2010
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28September 23rd 2010
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29September 23rd 2010
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“I'm a great believer in luck and I find the harder I work, the more I have of it.”
■ Thomas Jefferson
30September 23rd 2010
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31September 23rd 2010
DDDDDDeeeeeemmmmmmoooooo((((((mmmmmmaaaaaayyyyyybbbbbbeeeeee))))))
32September 23rd 2010
33September 23rd 2010
In the near future…all major Java
enterprise runtimes will support Apps
deployed as bundles
34September 23rd 2010
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