/// <inheritdoc/>
public Task <QMessage <T> > Dequeue()
{
var sql = @"
SET NOCOUNT ON;
WITH cte AS (
SELECT TOP(1) *
FROM [work].[QMessage] WITH (ROWLOCK, READPAST)
WHERE [QueueName] = @QueueName
ORDER BY [Date] ASC
)
DELETE FROM cte
OUTPUT [deleted].*;
";
using (var dbConnection = _dbConnectionFactory.Create()) {
dbConnection.Open();
var command = dbConnection.CreateCommand();
command.AddParameterWithValue("@QueueName", _queueNameResolver.Resolve(), DbType.String);
command.CommandText = sql;
command.CommandType = CommandType.Text;
var dataReader = command.ExecuteReader();
DbQMessage message = null;
while (dataReader.Read())
{
message = new DbQMessage {
Id = dataReader.GetGuid(0),
QueueName = dataReader.IsDBNull(1) ? default : dataReader.GetString(1),
Payload = dataReader.IsDBNull(2) ? default : dataReader.GetString(2),
Date = dataReader.GetDateTime(3),
RowVersion = dataReader.IsDBNull(4) ? default : (byte[])dataReader[nameof(DbQMessage.RowVersion)],
DequeueCount = dataReader.GetInt32(5),
State = (QMessageState)dataReader.GetInt32(6)
};
}
return(Task.FromResult(message != null ? message.ToModel <T>(_jsonSerializerOptions) : default));
/// <inheritdoc/>
public async Task <QMessage <T> > Dequeue()
{
var dbConnection = await _dbContext.Database.EnsureOpenConnectionAsync();
using (var command = dbConnection.CreateCommand()) {
command.AddParameterWithValue("@QueueName", _queueNameResolver.Resolve(), DbType.String);
command.CommandText = _queryDescriptor.Dequeue;
command.CommandType = CommandType.Text;
using (var dataReader = await command.ExecuteReaderAsync()) {
DbQMessage message = null;
while (dataReader.Read())
{
message = new DbQMessage {
Id = dataReader.GetGuid(0),
QueueName = dataReader.IsDBNull(1) ? default : dataReader.GetString(1),
Payload = dataReader.IsDBNull(2) ? default : dataReader.GetString(2),
Date = dataReader.GetDateTime(3),
RowVersion = dataReader.IsDBNull(4) ? default : dataReader.GetValue(4) as byte[],
DequeueCount = dataReader.GetInt32(5),
State = (QMessageState)dataReader.GetInt32(6)
};
}
return(message != null?message.ToModel <T>(_jsonSerializerOptions): default);