/
PullMessagesAsync.cs
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/
PullMessagesAsync.cs
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// Copyright 2020 Google Inc.
//
// 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.
// [START pubsub_subscriber_async_pull]
// [START pubsub_quickstart_subscriber]
using Google.Cloud.PubSub.V1;
using System;
using System.Threading;
using System.Threading.Tasks;
public class PullMessagesAsyncSample
{
public async Task<int> PullMessagesAsync(string projectId, string subscriptionId, bool acknowledge)
{
SubscriptionName subscriptionName = SubscriptionName.FromProjectSubscription(projectId, subscriptionId);
SubscriberClient subscriber = await SubscriberClient.CreateAsync(subscriptionName);
// SubscriberClient runs your message handle function on multiple
// threads to maximize throughput.
int messageCount = 0;
Task startTask = subscriber.StartAsync((PubsubMessage message, CancellationToken cancel) =>
{
string text = message.Data.ToStringUtf8();
Console.WriteLine($"Message {message.MessageId}: {text}");
Interlocked.Increment(ref messageCount);
return Task.FromResult(acknowledge ? SubscriberClient.Reply.Ack : SubscriberClient.Reply.Nack);
});
// Run for 5 seconds.
await Task.Delay(5000);
await subscriber.StopAsync(CancellationToken.None);
// Lets make sure that the start task finished successfully after the call to stop.
await startTask;
return messageCount;
}
}
// [END pubsub_subscriber_async_pull]
// [END pubsub_quickstart_subscriber]