public byte[] JoinIfComplete(MessageChunk chunk)
{
var count = _store.CountChunks(chunk.OriginalMessageId);
if (count >= chunk.ChunksCount - 1)
{
var chunks = _store.GetChunks(chunk.OriginalMessageId);
if (chunks.ContainsKey(chunk.ChunkId))
{
return(null);
}
chunks.Add(chunk.ChunkId, chunk.Content);
var completeMessage = Join(chunks);
_store.Cleanup(chunk.OriginalMessageId);
return(completeMessage);
}
else
{
_store.Store(chunk);
return(null);
}
}
public void Store(MessageChunk chunk)
{
lock (_lock)
{
// TODO: Log?
if (DbSet.Any(c => c.OriginalMessageId == chunk.OriginalMessageId && c.ChunkId == chunk.ChunkId))
{
return;
}
DbSet.Add(new TemporaryMessageChunk
{
OriginalMessageId = chunk.OriginalMessageId,
ChunkId = chunk.ChunkId,
ChunksCount = chunk.ChunksCount,
Content = chunk.Content,
Received = DateTime.UtcNow
});
}
}
public static IEnumerable <(object message, byte[] serializedMessage)> ChunkIfNeeded(string messageId, object message, ChunkSettings settings, IMessageSerializer serializer)
{
var serializedMessage = serializer.Serialize(message);
var chunkSize = settings?.Size ?? int.MaxValue;
if (chunkSize >= serializedMessage.Length)
{
yield return(message, serializedMessage);
yield break;
}
if (string.IsNullOrEmpty(messageId))
{
throw new InvalidOperationException(
"Dividing into chunks is pointless if no unique MessageId can be retrieved. " +
"Please add an Id or MessageId property to the message model or " +
"use a custom IMessageKeyProvider.");
}
var span = serializedMessage.AsMemory();
var chunksCount = (int)Math.Ceiling(serializedMessage.Length / (double)chunkSize);
var offset = 0;
for (var i = 0; i < chunksCount; i++)
{
var messageChunk = new MessageChunk
{
MessageId = Guid.NewGuid(),
OriginalMessageId = messageId,
ChunkId = i,
ChunksCount = chunksCount,
Content = span.Slice(offset, Math.Min(chunkSize, serializedMessage.Length - offset)).ToArray()
};
yield return(messageChunk, serializer.Serialize(messageChunk));
offset += chunkSize;
}
}