private IEnumerable<QueueMessage> DecodeMessages(PullRequest pullRequest, byte[] buffer)
{
var messages = new List<QueueMessage>();
if (buffer == null || buffer.Length <= 4)
{
return messages;
}
try
{
var nextOffset = 0;
var messageLength = MessageUtils.DecodeInt(buffer, nextOffset, out nextOffset);
while (messageLength > 0)
{
var message = new QueueMessage();
var messageBytes = new byte[messageLength];
Buffer.BlockCopy(buffer, nextOffset, messageBytes, 0, messageLength);
nextOffset += messageLength;
message.ReadFrom(messageBytes);
if (!message.IsValid())
{
_logger.ErrorFormat("Invalid message, pullRequest: {0}", pullRequest);
continue;
}
messages.Add(message);
if (nextOffset >= buffer.Length)
{
break;
}
messageLength = MessageUtils.DecodeInt(buffer, nextOffset, out nextOffset);
}
}
catch (Exception ex)
{
_logger.Error(string.Format("Decode pull return message has exception, pullRequest: {0}", pullRequest), ex);
}
return messages;
}
public QueueMessage GetMessage(long position)
{
var buffer = GetMessageBuffer(position);
if (buffer != null)
{
var nextOffset = 0;
var messageLength = MessageUtils.DecodeInt(buffer, nextOffset, out nextOffset);
if (messageLength > 0)
{
var message = new QueueMessage();
var messageBytes = new byte[messageLength];
Buffer.BlockCopy(buffer, nextOffset, messageBytes, 0, messageLength);
message.ReadFrom(messageBytes);
return message;
}
}
return null;
}