Month: June 2013

Remove certain item or clear whole OmniFaces cache

Nick Russler

The Omnifaces o:cache Component is a useful Tool when trying to speed up you jsf powered website.

But in some situations you need to remove a certain item from the cache or you want to clear the whole cache, while there seems to be a way (Example 4) to remove single items by Key we couldn’t find a ‘official’ way to clear the whole cache.

 

Here is our Solution to the Problem:

public static boolean removeOmniCacheItem(String key) {    	
	Map<string , Object> applicationMap = FacesContext.getCurrentInstance().getExternalContext().getApplicationMap();
 
	if (applicationMap.containsKey(DefaultCacheProvider.DEFAULT_CACHE_PARAM_NAME)) {
		synchronized (DefaultCacheProvider.class) {
			if (applicationMap.containsKey(DefaultCacheProvider.DEFAULT_CACHE_PARAM_NAME)) {
				((Cache)applicationMap.get(DefaultCacheProvider.DEFAULT_CACHE_PARAM_NAME)).remove(key);
				return true;
			}				
		}
	}
 
	return false;
}
 
public static boolean clearOmniCache() {    	
	Map</string><string , Object> applicationMap = FacesContext.getCurrentInstance().getExternalContext().getApplicationMap();
 
	if (applicationMap.containsKey(DefaultCacheProvider.DEFAULT_CACHE_PARAM_NAME)) {
		synchronized (DefaultCacheProvider.class) {
			if (applicationMap.containsKey(DefaultCacheProvider.DEFAULT_CACHE_PARAM_NAME)) {
				applicationMap.remove(DefaultCacheProvider.DEFAULT_CACHE_PARAM_NAME);
				return true;
			}				
		}
	}
 
	return false;
}
</string>

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