[Carbon-dev] what's the order of OSGi loading the bundle(include the Carbon bundle)

[Shi Liangliang]

Hello everyone:
    I check the source code fromhttp://svn.wso2.org/repos/wso2/trunk/carbon.  and compile them successfully using maven with a product named"wso2carbon-3.1.0-SNAPSHOT".
    when the server start, we will see the following info:

[2010-12-14 15:13:05,822] INFO {org.wso2.carbon.server.Main} - Initializing sy

stem...

[2010-12-14 15:13:05,977] INFO {org.wso2.carbon.server.TomcatCarbonWebappDeploy

er} - Deployed Carbon webapp: StandardEngine[carbonEngine].StandardHost[default

host].StandardContext[/]

 [2010-12-14 15:13:08,089] INFO {org.wso2.carbon.core.internal.CarbonCoreActivat

or} - Starting WSO2 Carbon...

[2010-12-14 15:13:08,108] INFO {org.wso2.carbon.core.internal.CarbonCoreActivat

or} - Operating System : Windows Vista 6.1, x86

[2010-12-14 15:13:08,110] INFO {org.wso2.carbon.core.internal.CarbonCoreActivat

or} - Java Home       : C:\Program Files\Java\jdk1.6.0_10\jre

[2010-12-14 15:13:08,113] INFO {org.wso2.carbon.core.internal.CarbonCoreActivat

or} - Java Version    : 1.6.0_10-rc2

[2010-12-14 15:13:08,115] INFO {org.wso2.carbon.core.internal.CarbonCoreActivat

or} - Java VM         : Java HotSpot(TM) Client VM 11.0-b15,Sun Microsystems I

nc.

[2010-12-14 15:13:08,118] INFO {org.wso2.carbon.core.internal.CarbonCoreActivat

or} - Carbon Home     : D:\WSO2-P~1\WSO2CA~1.0-S\bin\..

[2010-12-14 15:13:08,120] INFO {org.wso2.carbon.core.internal.CarbonCoreActivat

or} - Java Temp Dir   : D:\WSO2-P~1\WSO2CA~1.0-S\bin\..\tmp

[2010-12-14 15:13:08,122] INFO {org.wso2.carbon.core.internal.CarbonCoreActivat

or} - User            : Administrator, zh-CN, GMT+08:00\

 .............

2010-12-14 15:13:13,091] INFO {org.wso2.carbon.registry.core.internal.Registry

CoreServiceComponent} - Registry Mode   : READ-WRITE

[2010-12-14 15:13:13,369] INFO {org.wso2.carbon.core.init.CarbonServerManager}

- Starting Carbon initialization...

[2010-12-14 15:13:13,612] INFO {org.infinispan.factories.GlobalComponentRegistr

y} - Infinispan version: Infinispan 'Radegast' 4.1.0.CR2

[2010-12-14 15:13:13,628] INFO {org.infinispan.factories.ComponentRegistry} -

Infinispan version: Infinispan 'Radegast' 4.1.0.CR2

[2010-12-14 15:13:13,742] INFO {org.wso2.carbon.core.init.CarbonServerManager}

- Creating super-tenant Axis2 ConfigurationContext

...........................

      So I think the start process may be like this, 

       1. Main  class in the   org.wso2.carbon.server.jar

      2.  start a embeded tomcat

      3. deploy  the  content  of   CABONHOME/lib/core   as   a  tomcat  web app.

      4. when the first request comes in, the servlet(BridgeServlet)  specified in the web.xml will be inited.

      5.the BridgeServlet will  call the EquinoxFrameworkLauncher,  and  run it's  init(),deploy(),start()

      6. in EquinoxFrameworkLauncher 's   start() method, 

          it  will first read the CARBONHOME/lib/core/WEB-INF/eclipse/launch.ini, and  get the initial properties,the add some other information into the

properties[1],for example ,"osgi.launch.area"

         second, start the "org.eclipse.osgi- version...." and use this as the framework classloader.

     third,use this classloader to load class "org.eclipse.core.runtime.adaptor.EclipseStarter"
     forth, init its' property map by the above properties[1].
     fifth, call it's  startup method.
 
     I think after that  the EclipseStarter  will load the  bundles in "osgi.launch.area".
     But  what 's  the bundle 's  load order?
     In the red info of the start of the server, we can see when the osgi framework started, the org.wso2.carbon.core bundle will first be loaded ,then  the org.wso2.carbon.registry.core bundle, then the  some other carbon bundles.
     Please point out my errors and give some instructions on the bundle's load and execute order.
     Thank you very much!
Best wished.
                                                                
                                             ShiLiang liang 
                                         School of Computer Science
                                         Beijing University of Posts and Telecommunications
                                         Beijing 100876, P. R. China
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