On Nov 1, 2010, at 10:07 PM, Thomas Duffey wrote:
> Hi Jan,
>
> What if my goal is to remove from the cache a page w/a specific selector
> though? For example, if I have:
In this case you have actually 2 options ...
# either you cast the policy you obtain to the
info.magnolia.module.cache.cachepolicy.Default and call its
retrieveCacheKeys(uuid, repo) method to get all the keys related to that
content and then iterate through them to find one you want to flush and flush
it or
# you extend the Default cache policy with your own and override
shouldRefresh() method to make sure the cached copy is refreshed for the keys
you want it to be refreshed for.
Generating you own keys is unsafe since a) we might change the keys ourselves
or b) by changing configuration of the instance policy will start generating
keys that would not match and in both of those cases you would not notice until
someone complains about stale copies of content.
HTH,
Jan
>
> /foo/bar.one.html
> /foo/bar.two.html
> ...
>
> I have a case where I actually only want to remove /foo/bar.two.html from
> cache. If I understand what you are saying it sounds like I should not use
> the UUID because that would remove all variants of the page. I wrote some
> code that seems to work but it mostly ignores locale, parameters and is tied
> to a specific cache implementation. Less than ideal but I couldn't find any
> more general methods in Magnolia to help.
>
> public static void flushByHandle(String uri) {
>
> String localeString = null;
> Map<String, String> params = new HashMap<String, String>();
> String serverName = null;
>
> if (MgnlContext.isWebContext()) {
> localeString = MgnlContext.getWebContext().getLocale().toString();
> serverName = MgnlContext.getWebContext().getRequest().getServerName();
> }
>
> DefaultCacheKey key = new DefaultCacheKey(uri, serverName, localeString,
> params);
>
> CacheModule cacheModule =
> ModuleRegistry.Factory.getInstance().getModuleInstance(CacheModule.class);
> CacheFactory factory = cacheModule.getCacheFactory();
>
> Collection<CacheConfiguration> cacheConfigs =
> cacheModule.getConfigurations().values();
>
> for (CacheConfiguration config : cacheConfigs) {
> final Cache cache = factory.getCache(config.getName());
> cache.remove(key);
> }
> }
>
> Tom
>
> On Nov 1, 2010, at 3:12 PM, Jan Haderka wrote:
>
>> I'd suggest you retrieve the page by path to find out its uuid and then
>> remove it from cache using the methods for removing cache items by uuid.
>>
>> The reason is that there might be multiple variants of this page in the
>> cache - with or w/o selectors, with different locales, with different
>> parameters or headers, etc ... you get the picture. While you can possibly
>> construct the key for the cache item from the url used to create such a
>> cache entry, there are way too many other variants to make it reliable.
>> I don't have the code in front of me right now, but since some recent
>> version there are even commands you can call with the uuid to remove the
>> cache entries, so you can run it from scheduled task or as part of the
>> workflow.
>>
>> HTH,
>> Jan
>>
>> On Oct 29, 2010, at 3:39 PM, Thomas Duffey wrote:
>>
>>>
>>> Hi Everyone,
>>>
>>> Is it possible to programmatically remove items from the Magnolia cache?
>>> In particular, I would like to programmatically remove pages from cache
>>> when certain things occur. I found some code about removing items from
>>> cache by UUID but in some cases I will only know the page handle and it
>>> will include a selector, e.g.,
>>>
>>> /foo/bar.one.html
>>> /foo/bar.two.html
>>> etc.
>>>
>>> Does Magnolia even cache URLs with selectors separately and is there a way
>>> to remove just one of them from the cache if I know the handle?
>
> --
> Tom Duffey
> [email protected]
> 414-915-3915
>
>
>
>
>
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