Re: [appengine-java] how to do initialization at startup?
thanks, On Wed, Feb 17, 2010 at 12:29 AM, Stephan Hartmann wrote: > Your app becomes shut down if it does not receive any requests for some > time. After that, the next request will initiate a new startup sequence, so > the implementation of the servlet spec is correct. > > You should also implement ServletContextListener.contextDestroyed() to > perform cleanup of your data, if needed. > > Regards, > Stephan > > > 2010/2/17 AJ Chen > >> For standard web app, I use a context listener servlet to do >> initialization at startup. This also works in eclipse with GAE plugin, i.e. >> the context listener is called only once at startup. But, it does not work >> in production because the context listener servlet is called frequently. It >> seems GAE restarts the context or something that triggers the call to the >> listener servlet. SO, the question is: what's the right way to do one-time >> initialization (e.g. pre-load data) in GAE? Maybe GAE does not have the >> concept of initialization. Any suggestion is appreciated. >> -aj >> >> -- >> AJ Chen, PhD >> Chair, Semantic Web SIG, sdforum.org >> http://web2express.org >> @web2express on twitter >> Palo Alto, CA, USA >> 650-283-4091 >> *Monitoring social media in real time* >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Google App Engine for Java" group. >> To post to this group, send email to >> google-appengine-j...@googlegroups.com. >> To unsubscribe from this group, send email to >> google-appengine-java+unsubscr...@googlegroups.com >> . >> For more options, visit this group at >> http://groups.google.com/group/google-appengine-java?hl=en. >> > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine for Java" group. > To post to this group, send email to > google-appengine-j...@googlegroups.com. > To unsubscribe from this group, send email to > google-appengine-java+unsubscr...@googlegroups.com > . > For more options, visit this group at > http://groups.google.com/group/google-appengine-java?hl=en. > -- AJ Chen, PhD Chair, Semantic Web SIG, sdforum.org http://web2express.org @web2express on twitter Palo Alto, CA, USA 650-283-4091 *Monitoring social media in real time* -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] how to do initialization at startup?
Your app becomes shut down if it does not receive any requests for some time. After that, the next request will initiate a new startup sequence, so the implementation of the servlet spec is correct. You should also implement ServletContextListener.contextDestroyed() to perform cleanup of your data, if needed. Regards, Stephan 2010/2/17 AJ Chen > For standard web app, I use a context listener servlet to do initialization > at startup. This also works in eclipse with GAE plugin, i.e. the context > listener is called only once at startup. But, it does not work in production > because the context listener servlet is called frequently. It seems GAE > restarts the context or something that triggers the call to the listener > servlet. SO, the question is: what's the right way to do one-time > initialization (e.g. pre-load data) in GAE? Maybe GAE does not have the > concept of initialization. Any suggestion is appreciated. > -aj > > -- > AJ Chen, PhD > Chair, Semantic Web SIG, sdforum.org > http://web2express.org > @web2express on twitter > Palo Alto, CA, USA > 650-283-4091 > *Monitoring social media in real time* > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine for Java" group. > To post to this group, send email to > google-appengine-j...@googlegroups.com. > To unsubscribe from this group, send email to > google-appengine-java+unsubscr...@googlegroups.com > . > For more options, visit this group at > http://groups.google.com/group/google-appengine-java?hl=en. > -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
[appengine-java] how to do initialization at startup?
For standard web app, I use a context listener servlet to do initialization at startup. This also works in eclipse with GAE plugin, i.e. the context listener is called only once at startup. But, it does not work in production because the context listener servlet is called frequently. It seems GAE restarts the context or something that triggers the call to the listener servlet. SO, the question is: what's the right way to do one-time initialization (e.g. pre-load data) in GAE? Maybe GAE does not have the concept of initialization. Any suggestion is appreciated. -aj -- AJ Chen, PhD Chair, Semantic Web SIG, sdforum.org http://web2express.org @web2express on twitter Palo Alto, CA, USA 650-283-4091 *Monitoring social media in real time* -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
