how to clear a particular cache in ehcache ?
Say I have the following cache configured in ehcache.
1) OfficeMgtCache
2) BranchMgtCahce
3) EmployeeCache
I need to clear the cache of BranchMgtCahce part alone. (Should not remove this cache.but just clear the cache contents)
I have found clearAll() in CacheManager. But this will clear all the caches present.
Related
I just want to flush cache by variations, for example just flush the cache with variations id 5
I did't find any reference about flush params ..
thanks in advance .
There is no way to flush cache by variation, at least not in any standardized way (implementation would differ for different cache storages, and for some of them this could be impossible). However you can invalidate caches using TagDependency - after calling TagDependency::invalidate() old cache still will be stored in cache storage, but it will be discarded on Cache::get() call.
With 78002 even uncached extbase actions generate a cHash.
But a valid cHash used to (?) always generate a cache entry.
Can anybody explain the context and how the system knows not to create a cache entry in this case? Or is a cache entry created but just the plugins output stays uncached?
I am using google guava cache with reference-based eviction.
I wonder what happened if the cache is full and no element of it is marked as evictable? Is there an out of memory exception thrown?
Reference-based eviction is essentially no different than Java's standard GC behavior - the GC just ignores the reference's presence in the cache. If an object falls out of scope (everywhere but the cache) it will be evicted from the cache during GC. If all elements of the cache are in scope somewhere else and therefore cannot be GCed you will run into memory problems exactly like you would if you weren't using a cache. You cannot have more data in memory than the JVM is configured to permit. Using a reference-evicting cache doesn't change this.
My problem is similar to these, but since I am not allowed to comment, I have to ask again:
a) Drupal cache not working (tables empty)
b) Drupal cache tables are empty, not receiving data
I noticed that after I turned off the Boost module and activated the "normal" Drupal cache, cache tables (starting with cache_ in the database) are remaining empty. I read that this might be related to the use of the Memcache module which I used, too. But disabling that module doesn't change anything either.
I also suspected the Elysia Cron module to clear the cache every minute, but a) cache tables are always completely empty and b) system_cron just runs every hour.
Any more ideas what could be wrong?
It seems it did have to do with memcache: I had forgotten to remove the following line from my settings.php:
$conf['cache_inc'] = 'sites/all/modules/memcache/memcache.inc';
After removing/uncommenting it, the cache tables are being filled.
I've setup the enterprise library caching counters using Perfmon. However all I can see is number of entries in cache.
COuld someone please help me if there's way to find out the size of the cached object so that I can specify correct value for Max num of items to be cached and removed etc?
Also, what does Missed Caches really means as I see quiet large number of misses although my web application is working as expected. Do I need to worry about this counter?
Enterprise Library Caching does not provide the size of the cache or the size of objects in the cache.
There are various approaches to finding the object size that you could use to try to tune the cache size. See:
Find out the size of a .net object
How to get object size in memory?
A Cache Miss is when an item is attempted to be retrieved from the cache but the key is not found in the cache. Usually when this happens you would add the item to the cache. This is not usually alarming since for a cache with no backing store it will be empty at first so initially you would see cache misses but misses should decrease as the cache is loaded (unless of course items expire and are removed from the cache).