/// <summary>
/// Try receiving a message (Async)
/// </summary>
/// <param name="topic">The topic name</param>
/// <param name="cancellationToken"></param>
/// <returns>The message received -or- ReceivedResult<T>.Empty when no message is waiting</returns>
public async Task <ReceivedResult <T> > TryReceiveAsync(string topic,
CancellationToken cancellationToken = default(CancellationToken))
{
if (Logger.Value.IsDebugEnabled())
{
Logger.Value.Debug($"TryReceiveAsync<{typeof(T).FullName}>(...)");
}
var parameters = InitRemoveDbParameters(topic);
using (var connection = GetConnection())
{
await connection.OpenAsync(cancellationToken).ConfigureAwait(ContinueOnCapturedContext);
var sqlCmd = InitRemoveDbCommand(connection, parameters);
var reader = await sqlCmd.ExecuteReaderAsync(cancellationToken)
.ConfigureAwait(ContinueOnCapturedContext);
if (!reader.Read())
{
return(ReceivedResult <T> .Empty);
}
var json = (string)reader[0];
var messageType = (string)reader[1];
var id = (int)reader[3];
var contractResolver = new MessageDefaultContractResolver();
var settings = new JsonSerializerSettings {
ContractResolver = contractResolver
};
var message = JsonConvert.DeserializeObject <T>(json, settings);
return(new ReceivedResult <T>(true, json, topic, messageType, id, message));
}
}
/// <summary>
/// Try receiving a message
/// </summary>
/// <param name="topic">The topic name</param>
/// <returns>The message received -or- ReceivedResult<T>.Empty when no message is waiting</returns>
private ReceivedResult <T> TryReceive(string topic)
{
if (Logger.Value.IsDebugEnabled())
{
Logger.Value.Debug($"TryReceive<{typeof(T).FullName}>(...)");
}
var parameters = InitRemoveDbParameters(topic);
using (var connection = GetConnection())
{
connection.Open();
var sqlCmd = InitRemoveDbCommand(connection, parameters);
var reader = sqlCmd.ExecuteReader();
if (!reader.Read())
{
return(ReceivedResult <T> .Empty);
}
var json = (string)reader[0];
var messageType = (string)reader[1];
var id = (long)reader[3];
var contractResolver = new MessageDefaultContractResolver();
var settings = new JsonSerializerSettings {
ContractResolver = contractResolver
};
var message = JsonConvert.DeserializeObject <T>(json, settings);
return(new ReceivedResult <T>(true, json, topic, messageType, id, message));
}
}
