please go ahead, it is a good idea,
as to why 2 dbs?
it is one of those "I have no idea ask Rickard"
I do think we must support one for simple testing
:)
marc
|-----Original Message-----
|From: [EMAIL PROTECTED]
|[mailto:[EMAIL PROTECTED]]On Behalf Of
|Viktor
|Sent: Wednesday, May 16, 2001 3:11 PM
|To: [EMAIL PROTECTED]
|Subject: [JBoss-dev] hsql clean shutdown
|
|
|Greetings,
|
|I been browsing org.jboss.jdbc.HypersonicDatabase where on line 26 it sez :
|
|* Note that once started it cannot be shutdown
|
|The org.jboss.jdbc.HypersonicDatabase implements MBeanRegistration.
|So all that is needed is to send a [SHUTDOWN] command in a jdbc connection
|for hsql to shutdown cleanly (give it a chance to write out its
|memory cache
|and set the 'modified=no' in its property file).
|
|Today the MBean Server is Destroying the HypersonicDatabaseMBean without
|notifying the embedded org.hsql.Server (semantics from in how it is started
|?) - the result is that hsql will try to recover every time JBoss
|is started
|anew. This will show in the default.properties field 'modified=yes' - when
|it should be 'modified=no' in a clean shutdown. The default.script
|will grow
|from last time*n and never have a chance to get flushed other then
|manually.
|Note this will only manifest if hsql is used and then all changes during
|every invocation run, will be written to the default.script file for
|recovery purpose.
|
|One solution is for the MServer to call the instance of
|org.hsql.Server with
|a [SHUTDOWN] in a jdbc connection. Before MServer destroys the
|HypersonicDatabaseMBean wrapper class.
|
|This leads me into the opportunity of asking what the "think" is for having
|both Hypersonic and InstantDB started as default MBeans ? ...
|
|If there is seen to be merit in Hypersonic. I will try make a patch,
|as a smoth introduction for me into MBeans, and if so, all feeback
|on how to
|do it is more then welcome.
|
|/peter
|
|
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