blob: 1ac1b20dc1df0e580fa9be00f2c222087e5a1ee8 [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 Consuming;
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 consumer = client.NewConsumer(Schema.String)
.StateChangedHandler(Monitor)
.SubscriptionName("MySubscription")
.Topic(myTopic)
.Create();
Console.WriteLine("Press Ctrl+C to exit");
await ConsumeMessages(consumer, cts.Token);
}
private static async Task ConsumeMessages(IConsumer<string> consumer, CancellationToken cancellationToken)
{
try
{
await foreach (var message in consumer.Messages(cancellationToken))
{
Console.WriteLine($"Received: {message.Value()}");
await consumer.Acknowledge(message, cancellationToken);
}
}
catch (OperationCanceledException) { }
}
private static void Monitor(ConsumerStateChanged stateChanged, CancellationToken cancellationToken)
{
var stateMessage = stateChanged.ConsumerState switch
{
ConsumerState.Active => "is active",
ConsumerState.Inactive => "is inactive",
ConsumerState.Disconnected => "is disconnected",
ConsumerState.Closed => "has closed",
ConsumerState.ReachedEndOfTopic => "has reached end of topic",
ConsumerState.Faulted => "has faulted",
_ => $"has an unknown state '{stateChanged.ConsumerState}'"
};
var topic = stateChanged.Consumer.Topic;
Console.WriteLine($"The consumer for topic '{topic}' {stateMessage}");
}
}