blob: 88b9f7c7af3f587c62ce5fa1848eab6c7a3d5665 [file] [log] [blame]
/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
namespace Reading;
using DotPulsar;
using DotPulsar.Abstractions;
using DotPulsar.Extensions;
using System;
using System.Threading;
using System.Threading.Tasks;
internal static class Program
{
private static async Task Main()
{
const string myTopic = "persistent://public/default/mytopic";
var cts = new CancellationTokenSource();
Console.CancelKeyPress += (sender, args) =>
{
cts.Cancel();
args.Cancel = true;
};
await using var client = PulsarClient.Builder().Build(); //Connecting to pulsar://localhost:6650
await using var reader = client.NewReader(Schema.String)
.StartMessageId(MessageId.Earliest)
.StateChangedHandler(Monitor)
.Topic(myTopic)
.Create();
Console.WriteLine("Press Ctrl+C to exit");
await ReadMessages(reader, cts.Token);
}
private static async Task ReadMessages(IReader<string> reader, CancellationToken cancellationToken)
{
try
{
await foreach (var message in reader.Messages(cancellationToken))
{
Console.WriteLine($"Received: {message.Value()}");
}
}
catch (OperationCanceledException) { }
}
private static void Monitor(ReaderStateChanged stateChanged, CancellationToken cancellationToken)
{
var stateMessage = stateChanged.ReaderState switch
{
ReaderState.Connected => "is connected",
ReaderState.Disconnected => "is disconnected",
ReaderState.Closed => "has closed",
ReaderState.ReachedEndOfTopic => "has reached end of topic",
ReaderState.Faulted => "has faulted",
_ => $"has an unknown state '{stateChanged.ReaderState}'"
};
var topic = stateChanged.Reader.Topic;
Console.WriteLine($"The reader for topic '{topic}' {stateMessage}");
}
}