| public static MakeSafeRowkeyFromUrl ( string url ) : string | ||
| url | string | |
| return | string | |
// scan the cacheurls table, compare uris with counts > 0 to uris in cache, if match then evict uri and decrement count
public static void MaybePurgeCache(ICache cache)
{
try
{
var purgeable_entities = FetchPurgeableCacheDicts();
GenUtils.LogMsg("status", String.Format("MaybePurgeCache: {0} purgeable entities", purgeable_entities.Count), null);
foreach (var purgeable_entity in purgeable_entities)
{
var purgeable_cache_url = (string)purgeable_entity["cached_uri"];
if (cache[purgeable_cache_url] != null)
{
GenUtils.LogMsg("status", "MaybePurgeCache", purgeable_cache_url);
cache.Remove(purgeable_cache_url);
var obj = HttpUtils.FetchUrl(new Uri(purgeable_cache_url)); // rewarm the cache
var count = (int)purgeable_entity["count"];
count -= 1;
if (count < 0)
{
count = 0;
GenUtils.LogMsg("warning", "CacheUtils.MaybePurgeCache", "count went subzero, reset to zero");
}
purgeable_entity["count"] = count;
var rowkey = TableStorage.MakeSafeRowkeyFromUrl(purgeable_cache_url);
ts.UpdateEntity(cache_control_tablename, cache_control_partkey, rowkey, purgeable_entity);
}
}
}
catch (Exception e)
{
GenUtils.PriorityLogMsg("exception", "MaybePurgeCache", e.Message + e.StackTrace);
}
}
// called from CombineZonedEventStoresToZonelessEventStore at the end of an aggregation
// bumps the counters in the cacheurls table to equal the number of webroles running
public static void MarkBaseCacheEntryForRemoval(string cached_uri, int instance_count)
{
var entity = new Dictionary <string, object>();
entity.Add("cached_uri", cached_uri);
entity.Add("count", instance_count);
var rowkey = TableStorage.MakeSafeRowkeyFromUrl(cached_uri);
//ts.UpdateEntity(cache_control_tablename, cache_control_partkey, rowkey, entity);
TableStorage.DictObjToTableStore(TableStorage.Operation.update, entity, cache_control_tablename, cache_control_partkey, rowkey);
}
