private async void RetrieveZookeeperBrokerTopics()
{
if (string.IsNullOrEmpty(ZookeeperHostServer))
{
CurrentStatus = $"Zookeeper hosts is empty!";
MessageBox.Show("Please specify at least one zookeeper server!");
settings_valid = false;
return;
}
if (!ValidateZookeeperSettings())
{
CurrentStatus = $"Zookeeper hosts specified is not valid!";
settings_valid = false;
MessageBox.Show("Zookeeper hosts specified is invalid! \r\n Please see format indicated in wartermark text!", "Zookeeper host is invalid");
return;
}
if (TopicItems.Any())
{
TopicItems.Clear();
}
using (IZookeeperClient client = new ZookeeperClient(new ZookeeperClientOptions(ZookeeperHostServer)
{
BasePath = "/", //default value
ConnectionTimeout = TimeSpan.FromSeconds(10), //default value
SessionTimeout = TimeSpan.FromSeconds(20), //default value
OperatingTimeout = TimeSpan.FromSeconds(60), //default value
ReadOnly = false, //default value
SessionId = 0, //default value
SessionPasswd = null, //default value
EnableEphemeralNodeRestore = true //default value
}))
{
CurrentStatus = $"Retrieving data from Zookeeper server {ZookeeperHostServer}.";
try
{
var childNodes = await client.GetChildrenAsync("/brokers/topics");
if (childNodes.Any())
{
Dispatcher.CurrentDispatcher.Invoke(() => {
TopicItems.AddRange(childNodes);
CanSelectTopic = true;
CurrentStatus = $"Zookeeper topics has been fetched successfully.";
});
}
}
catch (Exception ex)
{
settings_valid = false;
TopicItems.Clear();
CurrentStatus = $"Error occurs when communicating with Zookeeper '{ZookeeperHostServer}'. {ex.Message}";
}
finally
{
client.Dispose();
}
}
}
private void StartConsumeMessages()
{
var canStart = !string.IsNullOrEmpty(ZookeeperHostServer) &&
!string.IsNullOrEmpty(KafkaHostServer) &&
TopicItems.Any() &&
!string.IsNullOrEmpty(SelectedTopic);
if (!canStart)
{
MessageBox.Show("Can't start consumer, please check zookeeper host, kafka host and selected topic!");
return;
}
ReceivedMessages.Clear();
Tables.Clear();
_cancelConsume = new CancellationTokenSource();
CurrentStatus = $"Consuming messages from topic:{SelectedTopic} ...";
DEKafkaMessageViewer.Common.KafkaConsumer consumer = new Common.KafkaConsumer();
var groupId = Guid.NewGuid().ToString();
consumer.ConsumeAsync(KafkaHostServer, SelectedTopic, groupId, _cancelConsume, (resultMsg) =>
{
var msgBody = resultMsg.Message;
EnableStop = true;
OnMessageConsumed(msgBody);
});
}