// Placed object message payload into a segment.
private ArraySegment <byte> EncodeMessageIntoSegment(StreamPosition streamPosition, EventData queueMessage)
{
byte[] propertiesBytes = queueMessage.SerializeProperties(this.serializationManager);
byte[] payload = queueMessage.Body.Array;
// get size of namespace, offset, partitionkey, properties, and payload
int size = SegmentBuilder.CalculateAppendSize(streamPosition.StreamIdentity.Namespace) +
SegmentBuilder.CalculateAppendSize(queueMessage.SystemProperties.Offset) +
SegmentBuilder.CalculateAppendSize(queueMessage.SystemProperties.PartitionKey) +
SegmentBuilder.CalculateAppendSize(propertiesBytes) +
SegmentBuilder.CalculateAppendSize(payload);
// get segment
ArraySegment <byte> segment = GetSegment(size);
// encode namespace, offset, partitionkey, properties and payload into segment
int writeOffset = 0;
SegmentBuilder.Append(segment, ref writeOffset, streamPosition.StreamIdentity.Namespace);
SegmentBuilder.Append(segment, ref writeOffset, queueMessage.SystemProperties.Offset);
SegmentBuilder.Append(segment, ref writeOffset, queueMessage.SystemProperties.PartitionKey);
SegmentBuilder.Append(segment, ref writeOffset, propertiesBytes);
SegmentBuilder.Append(segment, ref writeOffset, payload);
return(segment);
}
// Placed object message payload into a segment from a buffer pool. When this get's too big, older blocks will be purged
private ArraySegment <byte> SerializeMessageIntoPooledSegment(EventData queueMessage)
{
byte[] payloadBytes = queueMessage.GetBytes();
string streamNamespace = queueMessage.GetStreamNamespaceProperty();
int size = SegmentBuilder.CalculateAppendSize(streamNamespace) +
SegmentBuilder.CalculateAppendSize(queueMessage.Offset) +
SegmentBuilder.CalculateAppendSize(payloadBytes);
// get segment from current block
ArraySegment <byte> segment;
if (currentBuffer == null || !currentBuffer.TryGetSegment(size, out segment))
{
// no block or block full, get new block and try again
currentBuffer = bufferPool.Allocate();
currentBuffer.SetPurgeAction(PurgeAction);
// if this fails with clean block, then requested size is too big
if (!currentBuffer.TryGetSegment(size, out segment))
{
string errmsg = String.Format(CultureInfo.InvariantCulture,
"Message size is to big. MessageSize: {0}", size);
throw new ArgumentOutOfRangeException("queueMessage", errmsg);
}
}
// encode namespace, offset, and payload into segment
int writeOffset = 0;
SegmentBuilder.Append(segment, ref writeOffset, streamNamespace);
SegmentBuilder.Append(segment, ref writeOffset, queueMessage.Offset);
SegmentBuilder.Append(segment, ref writeOffset, payloadBytes);
return(segment);
}
// Placed object message payload into a segment.
protected virtual ArraySegment <byte> EncodeMessageIntoSegment(EventData queueMessage, Func <int, ArraySegment <byte> > getSegment)
{
byte[] propertiesBytes = queueMessage.SerializeProperties(this.serializer);
var payload = queueMessage.Body;
// get size of namespace, offset, partitionkey, properties, and payload
int size = SegmentBuilder.CalculateAppendSize(queueMessage.Offset.ToString()) +
SegmentBuilder.CalculateAppendSize(queueMessage.PartitionKey) +
SegmentBuilder.CalculateAppendSize(propertiesBytes) +
SegmentBuilder.CalculateAppendSize(payload);
// get segment
ArraySegment <byte> segment = getSegment(size);
// encode namespace, offset, partitionkey, properties and payload into segment
int writeOffset = 0;
SegmentBuilder.Append(segment, ref writeOffset, queueMessage.Offset.ToString());
SegmentBuilder.Append(segment, ref writeOffset, queueMessage.PartitionKey);
SegmentBuilder.Append(segment, ref writeOffset, propertiesBytes);
SegmentBuilder.Append(segment, ref writeOffset, payload);
return(segment);
}