public void GetReadings()
{
//we initialize the thread that will read from RabbitMQ
if (t == null)
{
lock (oLock)
{
if (t == null)
{
t = new Thread(() =>
{
ConnectToRabbit();
});
t.IsBackground = true;
t.Start();
}
}
}
//put the available data to json - java script will love it
DataContractJsonSerializer dcjs = new DataContractJsonSerializer(typeof(RemoteMover));
string rez = "";
HttpContext.Current.Response.ContentType = "application/json";
using (System.IO.MemoryStream sw = new System.IO.MemoryStream())
{
if (dictGrid.Count > 0)
{
RemoteMover rmLast = (RemoteMover)dictGrid.Last().Value;
sw.Write(System.Text.UTF8Encoding.UTF8.GetBytes("[\r\n"), 0, 3);
foreach (RemoteMover rm in dictGrid.Values)
{
dcjs.WriteObject(sw, rm);
if (rmLast != rm)
{
sw.Write(System.Text.UTF8Encoding.UTF8.GetBytes(",\r\n"), 0, 3);
}
}
sw.Write(System.Text.UTF8Encoding.UTF8.GetBytes("]\r\n"), 0, 3);
rez = System.Text.UTF8Encoding.UTF8.GetString(sw.ToArray());
}
}
HttpContext.Current.Response.Write(rez);
}
public RemoteMover JsonToRemoteMover(string json)
{
try {
DataContractJsonSerializer jdcs = new DataContractJsonSerializer(typeof(RemoteMover));
System.IO.MemoryStream ms = new System.IO.MemoryStream(System.Text.UTF8Encoding.UTF8.GetBytes(json));
RemoteMover rm = (RemoteMover)jdcs.ReadObject(ms);
return(rm);
}
catch (InvalidCastException)
{
return(null);
}
catch (SerializationException)
{
return(null);
}
}
//this function starts the first time the GetReadings function called
public void ConnectToRabbit()
{
ConnectionFactory cf = new ConnectionFactory();
DataContractJsonSerializer dcjs = new DataContractJsonSerializer(typeof(RemoteMover));
cf.HostName = "localhost";
cf.UserName = "******";
cf.Password = "******";
//connect to RabbitMQ
using (IConnection conn = cf.CreateConnection())
{
using (IModel channel = conn.CreateModel())
{
channel.ExchangeDeclare(exchange: "miscari", type: "fanout", durable: true);
var queueName = channel.QueueDeclare().QueueName;
channel.QueueBind(queue: queueName,
exchange: "miscari",
routingKey: "");
var consumer = new EventingBasicConsumer(channel);
consumer.Received += (model, ea) =>
{
var body = ea.Body;
var message = System.Text.UTF8Encoding.UTF8.GetString(body);
RemoteMover rm = JsonToRemoteMover(message);
if (rm != null)
{
WriteToDb(rm);
}
};
channel.BasicConsume(queue: queueName, noAck: true, consumer: consumer);
//not nice, but ... it does wait
while (true)
{
Thread.Sleep(50);
}
}
}
}
private void WriteToDb(RemoteMover rm)
{
using (MySqlConnection conn = new MySqlConnection(WebService1.connString))
{
try {
conn.Open();
}
catch (Exception)
{
return;
}
using (MySqlCommand mysqlComm = new MySqlCommand("insert into timeline(id_agent,x,y) values(@id_agent,@x,@y)", conn))
{
mysqlComm.Parameters.AddWithValue("@id_agent", rm.id);
mysqlComm.Parameters.AddWithValue("@x", rm.point.x);
mysqlComm.Parameters.AddWithValue("@y", rm.point.y);
mysqlComm.ExecuteNonQuery();
//only show what was written
dictGrid[rm.id] = rm;
}
}
}
