Thanks for the reply. Further questions inside. Annegret
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Julien Viet Sent: Donnerstag, 11. März 2004 12:17 To: [EMAIL PROTECTED] Subject: Re: [JBoss-user] MBean questions On Mar 11, 2004, at 11:42 AM, Sternagel Annegret (MPI/ADB) wrote: > Hello, > > I have 2 questions about MBeans: > > We have an MBean that looks every 30 seconds in the database if there > is an action to perform. > If there is an entry for an action, the action will be performed, this > may take several minutes. > Maybe there are a lot of action entries in the database which should > be performed sequential. > > 1. If we use the javax.management.timer.Timer and register for > notification every 30 seconds, what happens if a notification occures > and the MBean is still busy performing one action ? > Is the notification scipped ? (would be ok) > Are the notifications waiting ? (up to an overflow ?) > yes, if you want to avoid it you need to have a construct like : import EDU.oswego.cs.dl.util.concurrent.Mutex; private final Mutex mutex = new Mutex(); public final void run() { try { if (mutex.attempt(0)) { try { execute(); } finally { mutex.release(); } } } catch(InterruptedException ignore) { } } => Does this work for each MBean instance separately ? => What about "synchronize" ? > > 2. We would like to create several instances of this service on JBoss > startup, dependent on a configuration located in the database, and > maybe change it during runtime. These instances should look at > different specific action entries. > Is it possible to create several MBean instances at runtime using the > JMX-interface ? > What's the best way to provide the information to the MBean instance > which action entry each instance should look for ? > E.g. write an AbcFactoryMBean that creates the MBean instances, > add the action-information to the ServiceName > or set a propery with the action-information ? > why not package the different instances as services in xxx-service.xml ? => I do not know at installation time how many instances I need. And it may change at runtime if further configuration is added. > We use jboss 3.2.3. > > Any ideas appreciated. > > Annegret > > > > > ------------------------------------------------------- > This SF.Net email is sponsored by: IBM Linux Tutorials > Free Linux tutorial presented by Daniel Robbins, President and CEO of > GenToo technologies. Learn everything from fundamentals to system > administration.http://ads.osdn.com/?ad_id70&alloc_id638&op=click > _______________________________________________ > JBoss-user mailing list > [EMAIL PROTECTED] > https://lists.sourceforge.net/lists/listinfo/jboss-user > ------------------------------------------------------- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id70&alloc_id638&op=ick _______________________________________________ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user ------------------------------------------------------- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id70&alloc_id638&op=click _______________________________________________ JBoss-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-user
