97 lines
2.9 KiB
C#
97 lines
2.9 KiB
C#
using System;
|
|
using TDengineTMQ;
|
|
using TDengineDriver;
|
|
using System.Runtime.InteropServices;
|
|
|
|
namespace TMQExample
|
|
{
|
|
internal class SubscribeDemo
|
|
{
|
|
static void Main(string[] args)
|
|
{
|
|
IntPtr conn = GetConnection();
|
|
string topic = "topic_example";
|
|
//create topic
|
|
IntPtr res = TDengine.Query(conn, $"create topic if not exists {topic} as select * from meters");
|
|
|
|
if (TDengine.ErrorNo(res) != 0 )
|
|
{
|
|
throw new Exception($"create topic failed, reason:{TDengine.Error(res)}");
|
|
}
|
|
|
|
var cfg = new ConsumerConfig
|
|
{
|
|
GourpId = "group_1",
|
|
TDConnectUser = "root",
|
|
TDConnectPasswd = "taosdata",
|
|
MsgWithTableName = "true",
|
|
TDConnectIp = "127.0.0.1",
|
|
};
|
|
|
|
// create consumer
|
|
var consumer = new ConsumerBuilder(cfg)
|
|
.Build();
|
|
|
|
// subscribe
|
|
consumer.Subscribe(topic);
|
|
|
|
// consume
|
|
for (int i = 0; i < 5; i++)
|
|
{
|
|
var consumeRes = consumer.Consume(300);
|
|
// print consumeResult
|
|
foreach (KeyValuePair<TopicPartition, TaosResult> kv in consumeRes.Message)
|
|
{
|
|
Console.WriteLine("topic partitions:\n{0}", kv.Key.ToString());
|
|
|
|
kv.Value.Metas.ForEach(meta =>
|
|
{
|
|
Console.Write("{0} {1}({2}) \t|", meta.name, meta.TypeName(), meta.size);
|
|
});
|
|
Console.WriteLine("");
|
|
kv.Value.Datas.ForEach(data =>
|
|
{
|
|
Console.WriteLine(data.ToString());
|
|
});
|
|
}
|
|
|
|
consumer.Commit(consumeRes);
|
|
Console.WriteLine("\n================ {0} done ", i);
|
|
|
|
}
|
|
|
|
// retrieve topic list
|
|
List<string> topics = consumer.Subscription();
|
|
topics.ForEach(t => Console.WriteLine("topic name:{0}", t));
|
|
|
|
// unsubscribe
|
|
consumer.Unsubscribe();
|
|
|
|
// close consumer after use.Otherwise will lead memory leak.
|
|
consumer.Close();
|
|
TDengine.Close(conn);
|
|
|
|
}
|
|
|
|
static IntPtr GetConnection()
|
|
{
|
|
string host = "localhost";
|
|
short port = 6030;
|
|
string username = "root";
|
|
string password = "taosdata";
|
|
string dbname = "power";
|
|
var conn = TDengine.Connect(host, username, password, dbname, port);
|
|
if (conn == IntPtr.Zero)
|
|
{
|
|
throw new Exception("Connect to TDengine failed");
|
|
}
|
|
else
|
|
{
|
|
Console.WriteLine("Connect to TDengine success");
|
|
}
|
|
return conn;
|
|
}
|
|
}
|
|
|
|
}
|