private void OnHeartbet(object state)
{
CancellationToken cancellationToken = (CancellationToken)state;
while (cancellationToken.IsCancellationRequested == false)
{
logger.WriteTrace("Sending heartbeat for server id = {0}...", ServerId);
ServerHeartbeatModel serverHeartbeatModel = new ServerHeartbeatModel(ServerId, heartbeatLifetime);
serverDataContext.SendHeartbeat(serverHeartbeatModel);
logger.WriteTrace("The heartbeat has been sent.");
//Find servers that have been expired and delete them.
logger.WriteTrace("Finding and deleting servers that have been expired...");
int serverCount = serverDataContext.DeleteExpiredServers();
if (serverCount > 0)
{
logger.WriteTrace("There were(was) {0} servers that have(has) been expired. They were(was) deleted.",
serverCount);
}
else
{
logger.WriteTrace("There was no any expired servers.");
}
cancellationToken.WaitHandle.WaitOne(sleepTime);
}
}
/// <summary>
/// Send a heartbeat from the server.
/// </summary>
/// <param name="serverHeartbeatModel">The heartbeat information.</param>
public void SendHeartbeat(ServerHeartbeatModel serverHeartbeatModel)
{
logger.WriteTrace("Sending heartbeat from the server ({0}) to the database...", serverHeartbeatModel);
if (serverHeartbeatModel.ServerId <= 0)
{
throw new ArgumentException("Server's identifier should be greate than 0. Now it is " + serverHeartbeatModel.ServerId, "serverHeartbeatModel");
}
string sqlCommand = string.Format(heartbeatStatement, sqlSettings.WiseQueueDefaultSchema, serverTableName, serverHeartbeatModel.HeartbeatLifetime, serverHeartbeatModel.ServerId);
logger.WriteTrace("The SqlCommand has been generated. Result: {0}", sqlCommand);
logger.WriteTrace("Executing sql command...");
using (IDbConnection connection = connectionFactory.CreateConnection())
{
using (IDbCommand command = connectionFactory.CreateCommand(connection))
{
command.CommandText = sqlCommand;
int affectedRows = command.ExecuteNonQuery();
logger.WriteTrace("The command has been executed. The entity has been deleted. Affected rows = {0}.", affectedRows);
}
}
}