If you build modular app with Spring by importing children contexts into the parent ones, you face the limitations quite soon. The next step obviously, is approaching overweight OSGi. Isn't there something between these two extremes, which powerful enough and still light yet? Sure! Meet Banshun! Easy modularity for Spring. Banshun allows to instantiate children contexts in a proper order considering declared references between singletons across the contexts.

1. Yet Another One....
Banshun
a tiny based
Modular Framework
http://flic.kr/p/EWNYh

2. Agenda
●Enterprise Applications
●Banshun vs OSGi, EJB
●1, 2, 3 - BOOM!
●Features ...

3. Agenda - Features
●buildtime & runtime app customization
●developer friendliness
○references validation
○cycles resolution
○root cause logging
○fault-tolerance
○dependencies graph
●Spring AOP support

4. Is it your app?
:TheService
+ doBusiness(param) : Result

5. Is it your app?
:TheService
+ doBusiness(param) : Result
RDBMS

6. Is it your app?
:TheService
+ doBusiness(param) : Result

7. Is it your app?
<bean id="theService" class="com.foo.TheService">
... </bean>
<bean name="/web-service"
class="org.spring...HessianServiceExporter">
<property name="service" ref="theService"/> ....
</bean>
<bean id="/form" class="com....Controller"> </bean>

8. Don't you need to deploy it?
:TheService
+ doBusiness(param) : Result

9. Don't you need to deploy it?
:TheService
+ doBusiness(param) : Result
<<EAR>>
<<container>>

10. Don't you need to deploy it?
:TheService
+ doBusiness(param) : Result
<<WAR>>
<<container>>

11. The app becomes big
:FooService
:ZooService
:MooService
:FooService
:BarService
:BazService
<<WAR>>

12. The app becomes big
<<WAR>>
:FooService
:BarService
:BazService
:FooService
:BarService
:BazService

13. it have to be modular
:FooService
:BarService
:BazService
:MooService
:ZooService
<<component>>
:AService
:BService
:CService
:DService
:EService
<<component>>

14. :FooService
:BarService
:BazService
:MooService
:ZooService
<<component>>
:FooService
:BarService
:BazService
:MooService
:ZooService
<<component>>
<<WAR>> / <<EAR>>

15. is not modular out-of-the-box

16. even
is not modular

17. <import resource="...">
is not modular because of
●bean name clashes
●global scopes of settings and aspects
●zero tolerance for module failure

18. Glue code
should allow
to forge modules in
isolation

19. and then
work altogether

20. II. Banshun
vs
OSGi, EJB

21. http://docs.jboss.
org/jbossas/docs/Server_Configuration_Guide/4/html/Inside_the_JBoss_Class_Loading_
rchitecture-The_Complete_Class_Loading_Model.html

22. are about multiple
classloaders
OSGi EJB
http://docs.jboss.
org/jbossas/docs/Server_Configuration_Guide/4/html/Inside_the_JBoss_Class_Loading_
rchitecture-The_Complete_Class_Loading_Model.html

23. OSGi, EJB
is about multiple
classloaders
Single classloader
is enough!
Banshun
resolves versions at build time

24. OSGi, EJB
is about
hot partial redeploy

25. Never do that
at prod
it's not possible
to assure that it works
http://www.newpig.com/us/caution-hot-sign/SGN550

26. MANIFEST.MF
Manifest-Version: 1.0
Bundle-Name: Simple Service Bundle
Bundle-Description: Simple Service
Bundle-ManifestVersion: 2
Bundle-SymbolicName: ....sdms.message.messageService
Bundle-Version: 1.1.0
Import-Library: org.aspectj, org.springframework.spring
Import-Bundle: com....commons.lang;version="[2.4.0,2.4.0]"
Export-Package: ....sdms.message.service;version="1.1.0"
What is the value for your app?
YAGNI
<ejb-jar xmlns="./ns/javaee" xmlns:xsi="http://www"
version="3.0" xsi:schemaLocation="">
<enterprise-beans>
<session>
<ejb-name>TestBean</ejb-name>
<env-entry>
<description>admin email</description>
<env-entry-name>mail</env-entry-name>
<env-entry-value>admin@</env-entry>
</env-entry>
</session>
</enterprise-beans>

27. Banshun
●don't need any build
facility
●a few row artefacts

28. OSGi, EJB
has weak runtime facilities
launch and pray

29. http://www.lilycli.com/lart.html
Banshun
has full-fledged runtime
●and for everyday
development
●for production

31. III How does it work?
http://blog.rinajakubowicz.com/about-boom/

32. 1. instantiate children contexts
<bean id="root" class="..banshun.ContextParentBean">
<property name="configLocation"
value="authenticator-context.xml
datasource-context.xml
..."/>
... </bean>
<<WAR>>
...

33. 2. export singleton
<nested:export ref="sampleServie"
interface="com.gd.sn..SampleService"/>

34. 3. import singleton
<nested:import id="sampleServie"
interface="com.gd.sn..SampleService"/>

36. IV Features

37. Legend

42. References Checks
●wrong interface/name
●no exports
●lack of import

43. Handling Cycles
●detect
●prohibit
●resolve

44. 12:30:55,098|**WARN**| com.macys.platform.util.caching.repository.impl.CachingDistributedOverTransactionalNamedCacheRepository | Stored object 'MAIN_IndexedCatalogIndex' is not loaded at the moment of first usage. Repository will try to perform lazy loading. |Client
Details{sdpGrid:,ClientName: ClientInstanceName: ,ClientThreadName: }| pageMediaDistributedCacheWorker:0
12:30:55,099|**INFO**| com.macys.platform.util.caching.repository.impl.CachingDistributedOverTransactionalNamedCacheRepository | Loading stored object: 'MAIN_IndexedCatalogIndex'. Current version is null. |Client Details{sdpGrid:,ClientName: ClientInstanceName: ,
ClientThreadName: }| pageMediaDistributedCacheWorker:0
12:30:55,100|**WARN**| com.macys.platform.util.caching.repository.impl.CachingDistributedOverTransactionalNamedCacheRepository | Object were not loaded because object 'MAIN_IndexedCatalogIndex' is null. Current version is null. |Client Details{sdpGrid:,ClientName:
ClientInstanceName: ,ClientThreadName: }| pageMediaDistributedCacheWorker:0
12:30:55,100|**WARN**| com.macys.platform.navigation.providers.catalog.domain.impl.IndexedCatalogRepositoryImpl | Failed to initialize indexed catalog. |Client Details{sdpGrid:,ClientName: ClientInstanceName: ,ClientThreadName: }| pageMediaDistributedCacheWorker:
0
12:30:55,100|**ERROR**| com.tangosol.coherence.component.util.logOutput.Log4j | 2012-05-01 12:30:55.100/1208.996 Oracle Coherence EE 3.5.3/465 <Error> (thread=pageMediaDistributedCacheWorker:0, member=1): Failed to load key="PageMediaKey [pageId=519728,
pageRegion=PDP_CUSTOMER_REASSURANCE, pageDomain=PRODUCT, channelMode=SITE, mediaSourceType=PRODUCT]": |Client Details{sdpGrid:,ClientName: ClientInstanceName: ,ClientThreadName: }| Logger@9271941 3.5.3/465
12:30:55,101|**ERROR**| com.tangosol.coherence.component.util.logOutput.Log4j | 2012-05-01 12:30:55.100/1208.996 Oracle Coherence EE 3.5.3/465 <Error> (thread=pageMediaDistributedCacheWorker:0, member=1): com.macys.platform.navigation.providers.catalog.
index.exceptions.CatalogNotReadyException: Failed to initialize indexed catalog.
at com.macys.platform.navigation.providers.catalog.domain.impl.IndexedCatalogRepositoryImpl.getIndexedCatalog(IndexedCatalogRepositoryImpl.java:56)
at com.macys.platform.navigation.providers.catalog.domain.impl.IndexedCatalogRepositoryImpl.getIndexedCatalogClient(IndexedCatalogRepositoryImpl.java:31)
at com.macys.platform.navigation.providers.catalog.businesslogic.assembler.ProductAssembler.assemble(ProductAssembler.java:424)
at com.macys.platform.navigation.providers.catalog.componentmgr.CatalogServiceComponentManager.getProducts(CatalogServiceComponentManager.java:183)
at com.macys.platform.navigation.providers.catalog.componentmgr.CatalogServiceComponentManager.getProduct(CatalogServiceComponentManager.java:163)
at com.macys.platform.navigation.providers.catalog.componentmgr.CatalogServiceComponentManager.getProduct(CatalogServiceComponentManager.java:159)
at sun.reflect.GeneratedMethodAccessor133.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:196)
at $Proxy233.getProduct(Unknown Source)
at com.macys.platform.navigation.providers.catalog.da.componentmgr.CatalogServiceDAComponentMgr.getAttribute(CatalogServiceDAComponentMgr.java:295)
at sun.reflect.GeneratedMethodAccessor132.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:196)
at $Proxy247.getAttribute(Unknown Source)
at com.macys.platform.providers.media.businesslogic.mediafinder.ProductMediaFinder.getMediaKey(ProductMediaFinder.java:212)
at com.macys.platform.providers.media.componentmgr.PageMediaFinderComponent.getMediaKeysForRegion(PageMediaFinderComponent.java:54)
at com.macys.platform.providers.media.cache.PageMediaCacheLoader.load(PageMediaCacheLoader.java:47)
at com.macys.platform.util.caching.transactional.impl.factory.util.TransactionalCacheLoader$1.call(TransactionalCacheLoader.java:59)
at com.macys.platform.util.caching.transactional.impl.manager.TransactionalNamedCachesManagerImpl.invokeAs(TransactionalNamedCachesManagerImpl.java:150)
at com.macys.platform.util.caching.transactional.impl.factory.util.TransactionalCacheLoader.load(TransactionalCacheLoader.java:57)
at com.macys.platform.util.caching.transactional.impl.factory.util.CountingCacheLoaderWrapper.load(CountingCacheLoaderWrapper.java:22)
at com.macys.platform.util.caching.factory.NamedCacheFactoryBean$Loader.load(NamedCacheFactoryBean.java:318)
at com.tangosol.net.cache.ReadWriteBackingMap$CacheLoaderCacheStore.load(ReadWriteBackingMap.java:5166)
at com.tangosol.net.cache.ReadWriteBackingMap$CacheStoreWrapper.load(ReadWriteBackingMap.java:4314)
at com.tangosol.net.cache.ReadWriteBackingMap$CacheStoreWrapper.loadInternal(ReadWriteBackingMap.java:3987)
at com.tangosol.net.cache.ReadWriteBackingMap.get(ReadWriteBackingMap.java:754)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache.onGetRequest(DistributedCache.CDB:25)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.DistributedCache$GetRequest.run(DistributedCache.CDB:1)
at com.tangosol.coherence.component.util.DaemonPool$WrapperTask.run(DaemonPool.CDB:1)
at com.tangosol.coherence.component.util.DaemonPool$WrapperTask.run(DaemonPool.CDB:32)
at com.tangosol.coherence.component.util.DaemonPool$Daemon.onNotify(DaemonPool.CDB:63)
at com.tangosol.coherence.component.util.Daemon.run(Daemon.CDB:42)
at java.lang.Thread.run(Thread.java:662)
|Client Details{sdpGrid:,ClientName: ClientInstanceName: ,ClientThreadName: }| Logger@9271941 3.5.3/465
12:30:57,153|**INFO**| com.macys.platform.navigation.providers.preloader.coordinator.RefreshCoordinator | Retrieving product and reference data |Client Details{sdpGrid:,ClientName: ClientInstanceName: ,ClientThreadName: }| ProductDistributedCacheWorker:8
12:30:57,153|**INFO**| com.macys.platform.navigation.providers.preloader.coordinator.RefreshCoordinator | loadProduct(...) is started |Client Details{sdpGrid:,ClientName: ClientInstanceName: ,ClientThreadName: }| ProductDistributedCacheWorker:8
12:30:57,153|**INFO**| com.macys.platform.navigation.providers.preloader.loader.product.ProductLoader | Querying for products |Client Details{sdpGrid:,ClientName: ClientInstanceName: ,ClientThreadName: }| ProductDistributedCacheWorker:8
12:30:57,329|**INFO**| com.macys.platform.navigation.providers.preloader.loader.product.ProductLoader | Loading product attributes, search attributes, loading relations |Client Details{sdpGrid:,ClientName: ClientInstanceName: ,ClientThreadName: }|
ProductDistributedCacheWorker:8
12:30:57,330|**INFO**| com.macys.platform.navigation.providers.preloader.loader.attribute.AttributeLoader | Loading unary attributes |Client Details{sdpGrid:,ClientName: ClientInstanceName: ,ClientThreadName: }| ProductDistributedCacheWorker:8
12:30:57,344|**INFO**| com.macys.platform.navigation.providers.preloader.loader.attribute.AttributeLoader | Loading multi-valued attributes |Client Details{sdpGrid:,ClientName: ClientInstanceName: ,ClientThreadName: }| ProductDistributedCacheWorker:8
12:30:57,369|**INFO**| com.macys.platform.navigation.providers.preloader.loader.attribute.AttributeLoader | Loading attributes:
Loading unary completed
Loading multi-valued comleted
Loading attributes completed, total loaded: [1] in [39] ms |Client Details{sdpGrid:,ClientName: ClientInstanceName: ,ClientThreadName: }| ProductDistributedCacheWorker:8
12:30:57,370|**INFO**| com.macys.platform.navigation.providers.preloader.loader.attribute.AttributeLoader | Loading unary attributes |Client Details{sdpGrid:,ClientName: ClientInstanceName: ,ClientThreadName: }| ProductDistributedCacheWorker:8
12:30:57,370|**INFO**| com.macys.platform.navigation.providers.preloader.loader.attribute.AttributeLoader | Loading multi-valued attributes |Client Details{sdpGrid:,ClientName: ClientInstanceName: ,ClientThreadName: }| ProductDistributedCacheWorker:8
12:30:57,428|**INFO**| com.macys.platform.navigation.providers.preloader.loader.attribute.AttributeLoader | Loading attributes:
Loading unary completed
Loading multi-valued comleted
Loading attributes completed, total loaded: [0] in [58] ms |Client Details{sdpGrid:,ClientName: ClientInstanceName: ,ClientThreadName: }| ProductDistributedCacheWorker:8
12:30:57,428|**INFO**| com.macys.platform.navigation.providers.preloader.loader.product.ProductToCategoryLoader | loadData(...) started |Client Details{sdpGrid:,ClientName: ClientInstanceName: ,ClientThreadName: }| ProductDistributedCacheWorker:8
12:30:58,116|**INFO**| com.macys.platform.navigation.providers.preloader.loader.product.ProductToCategoryLoader$1 | Product-to-category load subtask completed. Retrieved data for [1] products. |Client Details{sdpGrid:,ClientName: ClientInstanceName: ,
ClientThreadName: }| ProductDistributedCacheWorker:8
12:30:58,116|**INFO**| com.macys.platform.navigation.providers.preloader.loader.product.ProductToCategoryLoader | Product-to-category load data completed in [688] ms |Client Details{sdpGrid:,ClientName: ClientInstanceName: ,ClientThreadName: }|
ProductDistributedCacheWorker:8
12:30:58,229|**INFO**| com.macys.platform.navigation.providers.preloader.loader.product.ProductLoader | Load Attributes:
Loading product attributes completed with [1] loaded
Loading product-to-category completed with [1] loaded
Loading product-to-product completed with [0] loaded logs root-cause at the bottom

45. Fault-tolerance mode
failure
causes
skipping

46. BA
A
B

47. Build time Customization
<bean id="root" class="..banshun.ContextParentBean">
<property name="configLocation"
value=" -context.xml
..."/>
... </bean>
*
B A

48. Run time Customization
<bean id="root" class="..banshun.ContextParentBean">
...
<property name="runOnlyServices"
value="basketService
profileService">
..
... </bean>
BA BA

49. skipped as
not needed
runOnlyServices

51. Spring AOP support
<bean id="proxyCreator" class="org.springframework.....
BeanNameAutoProxyCreator">
<property name="customTargetSourceCreators" >
<bean class="com.....LookupTargetSourceCreator"/>
</property>
<property name="beanNames">
<list> <value>*_beanDef</value> </list>
</property>
<property name="interceptorNames"> <list>
<idref bean="jamonPerformanceMonitorInterceptor" />
</list> </property>
</bean>

52. http://blog.griddynamics.com/search/label/Spring
http://github.com/griddynamics/banshun
mkhludnev@griddynamics.com
banshun@googlegroups.com
http://goo.gl/RZays
Whodunit
Artem Kirichkov
Oleg Malakhov
Eugeny Morozov
Alexey Olenev
Vladimir Polyakov
Mikhail Khludnev
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