public void OnImageLoaded(string nextSeriesInstanceUid, string nextSopInstanceUid)
{
PrefetchQueueItem item = new PrefetchQueueItem();
item.SeriesInstanceUid = nextSeriesInstanceUid;
item.SopInstanceUid = nextSopInstanceUid;
_prefetchQueue.Enqueue(item);
_enqueueEvent.Set();
}
private void Run()
{
while (!_stop)
{
while (_prefetchQueue.Count > 0)
{
PrefetchQueueItem item = _prefetchQueue.Dequeue();
if (item != null)
{
Prefetch(item);
}
}
_enqueueEvent.WaitOne(1000, true);
}
Platform.Log(LogLevel.Debug, "Prefetch has stopped. Series {0}", _seriesInstanceUid);
}
private void Prefetch(PrefetchQueueItem item)
{
try{
string key = string.Format("ImageStreamPrefetchStream/{0}/{1}/{2}/{3}",
_storage.ServerPartition.AeTitle, _storage.StudyInstanceUid,
item.SeriesInstanceUid, item.SopInstanceUid);
for (int i = 0; i < 5; i++)
{
Stream stream = HttpRuntime.Cache[key] as Stream;
if (stream != null)
{
// already pre-open
break;
}
else
{
try
{
stream = new BufferedStream(File.OpenRead(_storage.GetSopInstancePath(item.SeriesInstanceUid, item.SopInstanceUid)));
HttpRuntime.Cache.Insert(key, stream, null, Cache.NoAbsoluteExpiration, Cache.NoSlidingExpiration, CacheItemPriority.Default, PrefetchUnloaded);
break;
}
catch (FileNotFoundException)
{
throw;
}
catch (IOException)
{
Random rand = new Random();
Thread.Sleep(rand.Next(100, 500));
}
}
}
}
catch (Exception ex)
{
Platform.Log(LogLevel.Error, ex, "Error occurred during prefetch SOP: {0}", item.SopInstanceUid);
}
}