You are going to get a JCache instance for every GAE JVM-instance
which is spun up and there's no guarantee (in fact in my experience
it's pretty unlikely) that your GAE-instance will even be up for 2
hours. It's worth remembering that you can have multiple GAE-
instances running at the same time and take that into consideration
for your app's design - you have no idea what instance your cron job
will run on, but it will only ever work against one of your instances.
On Nov 22, 12:40 am, Joerg Weingarten <jbwinvest...@gmail.com> wrote:
> I am using Memcache/JCache to add certain Strings to the Cache.
> Somehow I thought there would be only 1 instance of my cache that is
> shared across my application. To refresh my cache I have a cron job
> that is supposed to do the refresh, if needed. What I am seeing though
> is that the cache gets always refreshed. What am I missing?
>
> Sample code:
>
> Cache cache = null;
> try {
> cache = CacheManager.getInstance().getCache("TIPCache");
> if (cache == null) {
> CacheFactory cacheFactory =
> CacheManager.getInstance().getCacheFactory();
> cache =
> cacheFactory.createCache(Collections.emptyMap());
>
> CacheManager.getInstance().registerCache("TIPCache", cache);
> }
> if (!cache.containsKey("somekey")) {
> cache.put("somekey", "some string");
> log.info("Cache updated");
> }
> else {
> log.info("Cache up to date");
> }
> } catch (CacheException e) {
> log.severe("Could not create CACHE instances!");
> }
>
> Code like the above is running every 2 hours using a cron job. I would
> expect to see the message "Cache up to date", but I see "Cache
> updated" every 2 hours.
>
> What am I doing wrong?
> Thx
> ---Joerg---
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