/// <summary>
/// Initialize the eviction policy to run on the specified cache
/// </summary>
/// <param name="cache"></param>
public void Initialize(AbstractCache cache)
{
foreach (var entry in cache.ListEntries())
{
NotifyInsert(entry.Key, entry.Size, entry.Priority);
}
}
/// <summary>
/// Runs this policy against the specified cache until a target number of bytes have been evicted from the cache
/// </summary>
/// <param name="cache">The cache to run against</param>
/// <param name="target">The target number of bytes to be evicted from the cache</param>
public void Run(AbstractCache cache, long target)
{
lock (this)
{
if (_running)
{
#if SILVERLIGHT || PORTABLE
_evictionCompleted.WaitOne();
#else
_evictionCompleted.Wait();
#endif
}
_running = true;
_evictionCompleted.Reset();
}
long evictedBytes = 0;
TimestampedCacheEntry removed;
foreach (var lpEntry in _normalPriorityEntries.Values.OrderBy(e => e.Timestamp))
{
if (_normalPriorityEntries.TryRemove(lpEntry.Key, out removed))
{
evictedBytes += cache.EvictEntry(lpEntry.Key);
}
if (evictedBytes >= target)
{
break;
}
}
if (evictedBytes < target)
{
foreach (var npEntry in _highPriorityEntries.Values.OrderBy(e => e.Timestamp))
{
if (_highPriorityEntries.TryRemove(npEntry.Key, out removed))
{
evictedBytes += cache.EvictEntry(npEntry.Key);
}
if (evictedBytes >= target)
{
break;
}
}
}
_evictionCompleted.Set();
}