Rahul, If you're using App Engine's MemcacheService directly (or indirectly, for example through our JSR 107 support), then you are talking to backend memcache instances that have lifetimes separate from your JVMs.
I.E. MemcacheServiceFactory.getMemcacheService<http://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/memcache/MemcacheServiceFactory.html#getMemcacheService()> does not create a new memcache backend - it just "connects" to an existing one. You have one logical memcache backend that is shared between all of your application's JVMs. On Tue, May 25, 2010 at 3:12 PM, Rahul <[email protected]> wrote: > Ikai, > > I am not sure what you mean by Memcache instances stays up because i > tried the following code and everytime when a new jvm instance is > created, the cache instance is also created again. Below is the code i > am using, let me know if i am missing anything or not doing anything > correct. > > Request comes from the following code: > > MyCache _cache = MyCache.getInstance(); > redirectUrl = _cache.findInCache(requestedURI); > > > MyCache Class: > > private static MyCache _instance; > private Cache cache; > > public static synchronized MyCache getInstance() { > if (_instance == null) { > _instance = new MyCache(); > }else{ > log.info("Using existing cache instance and NO NEW > Instance is > created"); > } > > return _instance; > } > > and in the constructor i am creating new cache fetching everything > from the database. > > Also, i have a listener in place which tells me when the new jvm > instance is started. > > Thanks, > Rahul > > On May 24, 3:56 pm, "Ikai L (Google)" <[email protected]> wrote: > > Memcache instances stay up. They're shared, namespaced (security) > instances > > and will more likely than not outlive the lifecycles of your application > > instances. > > > > On Sun, May 23, 2010 at 11:17 PM, Tristan <[email protected] > >wrote: > > > > > > > > > > > > > Does anyone know the answer to this: > > > > > If all the JVMs are killed, does the memcache stick around or is it > > > recycled? (I know memcache expires eventually, just curious if it is > > > possible for it to carry data across JVM valley of death) > > > > > Cheers, > > > > > Tristan > > > > > -- > > > 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 > > > [email protected]. > > > To unsubscribe from this group, send email to > > > [email protected]<google-appengine-java%[email protected]><google-appengine-java%2B > [email protected]> > > > . > > > For more options, visit this group at > > >http://groups.google.com/group/google-appengine-java?hl=en. > > > > -- > > Ikai Lan > > Developer Relations, Google App Engine > > Twitter:http://twitter.com/ikai > > Delicious:http://delicious.com/ikailan > > > > ---------------- > > Google App Engine links: > > Blog:http://googleappengine.blogspot.com > > Twitter:http://twitter.com/app_engine > > Reddit:http://www.reddit.com/r/appengine > > > > -- > > 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 > [email protected]. > > To unsubscribe from this group, send email to > [email protected]<google-appengine-java%[email protected]> > . > > For more options, visit this group athttp:// > 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 > [email protected]. > To unsubscribe from this group, send email to > [email protected]<google-appengine-java%[email protected]> > . > 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 [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
