private void ConsumeClick(object sender, RoutedEventArgs arg)
{
m_btnConsume.IsEnabled = false;
m_btnStop.Dispatcher.Invoke(() => { m_btnStop.IsEnabled = true; });
BrokerUnit bu = new BrokerUnit(m_broker);
try
{
Common.Net.TcpConnectionTest(bu.m_ip, bu.m_port, int.Parse(AppConfig.m_conf.AppSettings.Settings["operationTimeout"].Value));
}
catch (Exception ex)
{
m_btnConsume.IsEnabled = true;
m_btnStop.IsEnabled = false;
MessageBox.Show(ex.Message);
return;
}
Task.Run(() =>
{
UInt32 cntMax = UInt32.Parse(m_cnt);
m_cts = new CancellationTokenSource();
StreamWriter writer = null;
if (m_save2File)
{
writer = new StreamWriter(Common.Dir.GetCacheDir() + bu.m_ip + "-" + m_topic + ".log");
}
string groupId = null;
if (m_groupId == "")
{
groupId = DateTime.Now.ToString();
}
else
{
groupId = m_groupId;
}
var conf = new ConsumerConfig
{
GroupId = groupId,
//AutoOffsetReset = AutoOffsetReset.Latest,
BootstrapServers = bu.m_broker,
//SocketTimeoutMs = 1000,
//SessionTimeoutMs = 1000,
//MetadataRequestTimeoutMs=1000,
ReconnectBackoffMs = 1000,
ReconnectBackoffMaxMs = 3000,
// Note: The AutoOffsetReset property determines the start offset in the event
// there are not yet any committed offsets for the consumer group for the
// topic/partitions of interest. By default, offsets are committed
// automatically, so in this example, consumption will only start from the
// earliest message in the topic 'my-topic' the first time you run the program.
AutoOffsetReset = AutoOffsetReset.Latest
};
using (var c = new ConsumerBuilder <Ignore, string>(conf).Build())
{
c.Subscribe(m_topic);
uint cnt = 0;
try
{
while (true)
{
try
{
var cr = c.Consume(m_cts.Token);
if (m_save2File)
{
writer.Write(cr.Message.Value + System.Environment.NewLine);
}
OnConsumeMsg?.Invoke(this, cr.Message.Value);
cnt++;
if (cntMax != 0)
{
if (cnt >= cntMax)
{
c.Close();
break;
}
}
Thread.Sleep(10);
//Console.WriteLine($"Consumed message '{cr.Value}' at: '{cr.TopicPartitionOffset}'.");
}
catch (ConsumeException ex)
{
MessageBox.Show(ex.Message);
//Log.LogErr(e.Error.Reason);
//Console.WriteLine($"Error occured: {e.Error.Reason}");
}
}
}
catch (OperationCanceledException)
{
// Ensure the consumer leaves the group cleanly and final offsets are committed.
c.Close();
//return;
}
}
if (m_save2File)
{
writer.Close();
}
m_btnConsume.Dispatcher.Invoke(() => { m_btnConsume.IsEnabled = true; });
m_btnStop.Dispatcher.Invoke(() => { m_btnStop.IsEnabled = false; });
});
}
private void HandleMsg(string msg)
{
OnConsumeMsg?.Invoke(this, msg);
}