Understanding Cache Regions

[matt.price]

From here: https://docs.whitestein.com/lsps/3_1/pds/CacheRegions.html

Trying to understand where the caching regions would be in effect. Or how the cache is keyed?

A: Given, cache region exists for SomeSharedRecord and cached region is empty.
When,

Code: Select all

def SomeSharedRecord ssr1 := findById(7, SomeSharedRecord);
def SomeSharedRecord ssr2 := findById(7, SomeSharedRecord);

Then, ssr2 is pulled from cache.

B: Given, cache region exists for SomeSharedRecord and cached region is empty.
Given, findSomeSharedRecords is a query that has a parameter of primary keys as a Set and the condition simply uses the set in an in clause (iterator.pk in pkSet)
When,

Code: Select all

def SomeSharedRecord ssr1 := findById(7, SomeSharedRecord);
def List<SomeSharedRecord> ssrs := findSomeSharedRecords({5, 6, 7});

Then, the element in ssrs that represents 7, was not pulled from cache.

Are examples A and B true? I'm assuming query results are not cached.

[Roman Kubascik]

Hi Matt,

yes, you are right, both A and B are true. Queries are not cached.

Regards,
Roman

[matt.price]

Roman, thanks for the verification.

Is log output like this indicative of some application server setting that needs to be flipped? I've tried with -Dnet.sf.ehcache.disabled=false added to the startup config.

[Wildfly 9.0.2.Final]

2016-08-09 13:01:47,644 WARN [net.sf.ehcache.Cache] (default task-22) Cache: businessrules%3A%3Arules is disabled because the net.sf.ehcache.disabled property was set to true. No elements will be added to the cache.
2016-08-09 13:01:47,644 WARN [net.sf.ehcache.Cache] (default task-22) Cache: SHARED_RECORDS_REGION is disabled because the net.sf.ehcache.disabled property was set to true. No elements will be added to the cache.
2016-08-09 13:01:47,847 WARN [net.sf.ehcache.config.CacheConfiguration] (default task-22) Cache 'businessrules%3A%3Arules' is set to eternal but also has TTI/TTL set. To avoid this warning, clean up the config removing conflicting values of eternal, TTI and TTL. Effective configuration for Cache 'businessrules%3A%3Arules' will be eternal='true', timeToIdleSeconds='0', timeToLiveSeconds='0'.
2016-08-09 13:01:47,863 WARN [net.sf.ehcache.Cache] (default task-22) Cache: businessrules%3A%3Arules is disabled because the net.sf.ehcache.disabled property was set to true. No elements will be added to the cache.
2016-08-09 13:01:47,863 WARN [net.sf.ehcache.Cache] (default task-22) Cache: SHARED_RECORDS_REGION is disabled because the net.sf.ehcache.disabled property was set to true. No elements will be added to the cache.

[Roman Kubascik]

Default value of the net.sf.ehcache.disabled is false, so you don't have to override it. Isn't it activated somewhere? (e.g. JAVA_OPTS)
Please check the log of the server. Do you see there anything about net.sf.ehcache.disabled ? Check section "Configured system properties:".
BTW Is "rules" cache defined usual way in PDS? PDS uses regular hibernate with ehcache.

[Roman Kubascik]

Caches are created as disabled and they are enabled later. So it's ok to see in the log message like:

Cache: businessrules%3A%3Arules is disabled because the net.sf.ehcache.disabled property was set to true. No elements will be added to the cache.

but you should also see message:

Cache: businessrules%3A%3Arules is enabled.