private long getMinSizeFromProperty(CacheInfo cacheInfo) {
        String sizeProp = cacheInfo.getParams().get("back-size-low");
        if (sizeProp != null) {
            if ("0".equals(sizeProp)) {
                return -1L;
            }
            try {
                return Integer.parseInt(sizeProp);
            }
            catch (NumberFormatException nfe) {
                Log.warn("Unable to parse back-size-low for cache: " + cacheInfo.getCacheName());
            }
        }
        // Return default
        return CacheFactory.DEFAULT_MAX_CACHE_SIZE;
    }
Unregisters all caches for the given plugin.

@param pluginName the name of the plugin whose caches will be unregistered.
xmppserver/src/main/java/org/jivesoftware/openfire/container/PluginCacheRegistry.java