private List <IBatchContainer> DrainBucket(CacheBucket bucket)
{
var itemsToRelease = new List <IBatchContainer>(bucket.NumCurrentItems);
// walk all items in the cache starting from last
// and remove from the cache the oness that reside in the given bucket until we jump to a next bucket
while (bucket.NumCurrentItems > 0)
{
SimpleQueueCacheItem item = cachedMessages.Last.Value;
if (item.CacheBucket.Equals(bucket))
{
if (!item.DeliveryFailure)
{
itemsToRelease.Add(item.Batch);
}
bucket.UpdateNumItems(-1);
cachedMessages.RemoveLast();
}
else
{
// this item already points into the next bucket, so stop.
break;
}
}
return(itemsToRelease);
}
private void Add(IBatchContainer batch, StreamSequenceToken sequenceToken)
{
if (batch == null)
{
throw new ArgumentNullException("batch");
}
CacheBucket cacheBucket = null;
if (cacheCursorHistogram.Count == 0)
{
cacheBucket = new CacheBucket();
cacheCursorHistogram.Add(cacheBucket);
}
else
{
cacheBucket = cacheCursorHistogram[cacheCursorHistogram.Count - 1]; // last one
}
if (cacheBucket.NumCurrentItems == CACHE_HISTOGRAM_MAX_BUCKET_SIZE) // last bucket is full, open a new one
{
cacheBucket = new CacheBucket();
cacheCursorHistogram.Add(cacheBucket);
}
// Add message to linked list
var item = new SimpleQueueCacheItem
{
Batch = batch,
SequenceToken = sequenceToken,
CacheBucket = cacheBucket
};
cachedMessages.AddFirst(new LinkedListNode <SimpleQueueCacheItem>(item));
cacheBucket.UpdateNumItems(1);
if (Size > maxCacheSize)
{
//var last = cachedMessages.Last;
cachedMessages.RemoveLast();
var bucket = cacheCursorHistogram[0]; // same as: var bucket = last.Value.CacheBucket;
bucket.UpdateNumItems(-1);
if (bucket.NumCurrentItems == 0)
{
cacheCursorHistogram.RemoveAt(0);
}
}
}
private void Add(IBatchContainer batch, StreamSequenceToken sequenceToken)
{
if (batch == null)
{
throw new ArgumentNullException(nameof(batch));
}
// this should never happen, but just in case
if (Size >= maxCacheSize)
{
throw new CacheFullException();
}
CacheBucket cacheBucket;
if (cacheCursorHistogram.Count == 0)
{
cacheBucket = new CacheBucket();
cacheCursorHistogram.Add(cacheBucket);
}
else
{
cacheBucket = cacheCursorHistogram[cacheCursorHistogram.Count - 1]; // last one
}
if (cacheBucket.NumCurrentItems == CACHE_HISTOGRAM_MAX_BUCKET_SIZE) // last bucket is full, open a new one
{
cacheBucket = new CacheBucket();
cacheCursorHistogram.Add(cacheBucket);
}
// Add message to linked list
var item = new SimpleQueueCacheItem
{
Batch = batch,
SequenceToken = sequenceToken,
CacheBucket = cacheBucket
};
cachedMessages.AddFirst(new LinkedListNode <SimpleQueueCacheItem>(item));
cacheBucket.UpdateNumItems(1);
}
private void Add(IBatchContainer batch, StreamSequenceToken sequenceToken)
{
if (batch == null) throw new ArgumentNullException("batch");
CacheBucket cacheBucket = null;
if (cacheCursorHistogram.Count == 0)
{
cacheBucket = new CacheBucket();
cacheCursorHistogram.Add(cacheBucket);
}
else
{
cacheBucket = cacheCursorHistogram[cacheCursorHistogram.Count - 1]; // last one
}
if (cacheBucket.NumCurrentItems == CACHE_HISTOGRAM_MAX_BUCKET_SIZE) // last bucket is full, open a new one
{
cacheBucket = new CacheBucket();
cacheCursorHistogram.Add(cacheBucket);
}
// Add message to linked list
var item = new SimpleQueueCacheItem
{
Batch = batch,
SequenceToken = sequenceToken,
CacheBucket = cacheBucket
};
cachedMessages.AddFirst(new LinkedListNode<SimpleQueueCacheItem>(item));
cacheBucket.UpdateNumItems(1);
if (Size > maxCacheSize)
{
//var last = cachedMessages.Last;
cachedMessages.RemoveLast();
var bucket = cacheCursorHistogram[0]; // same as: var bucket = last.Value.CacheBucket;
bucket.UpdateNumItems(-1);
if (bucket.NumCurrentItems == 0)
{
cacheCursorHistogram.RemoveAt(0);
}
}
}