150 lines
4.3 KiB
Markdown
150 lines
4.3 KiB
Markdown
# Отчёт по лабораторной работе №4
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Выполнил: студент гр. ИСЭбд-41 Михайлов Ю.С.
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## Прохождение туториалов
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Установил RabbitMQ, Erlang и зашел в брокер под гостем по адресу http://localhost:15672/#/
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Туториал 1:
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Туториал 2:
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Туториал 3:
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## Разработка демонстрационных приложений
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Предметная область - оформление заявлений на стипендию в университете. Разработано три приложения согласно предметной области.
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1. Publisher:
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```
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using System.Text;
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using RabbitMQ.Client;
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var factory = new ConnectionFactory { HostName = "localhost" };
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using var connection = factory.CreateConnection();
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using var channel = connection.CreateModel();
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channel.ExchangeDeclare(exchange: "report", type: ExchangeType.Fanout);
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Random rand = new Random();
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foreach (var item in Enumerable.Range(0, 1000))
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{
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var message = rand.Next().ToString();
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var body = Encoding.UTF8.GetBytes(message);
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channel.BasicPublish(exchange: "report",
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routingKey: string.Empty,
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basicProperties: null,
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body: body);
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Console.WriteLine($" [x] Поступило заявление {message}");
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await Task.Delay(500);
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}
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Console.WriteLine(" Press [enter] to exit.");
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Console.ReadLine();
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static string GetMessage(string[] args)
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{
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return ((args.Length > 0) ? string.Join(" ", args) : "info: Принято!");
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}
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```
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2. Consumer 1:
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```
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using System.Text;
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using RabbitMQ.Client;
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using RabbitMQ.Client.Events;
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var factory = new ConnectionFactory { HostName = "localhost" };
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using var connection = factory.CreateConnection();
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using var channel = connection.CreateModel();
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channel.QueueDeclare(queue: "accepted");
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channel.QueueBind(queue: "accepted",
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exchange: "report",
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routingKey: string.Empty);
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Console.WriteLine(" [*] Waiting for messages.");
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var consumer = new EventingBasicConsumer(channel);
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consumer.Received += async (model, ea) =>
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{
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byte[] body = ea.Body.ToArray();
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var message = Encoding.UTF8.GetString(body);
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string outputText = $"Заявление принято к обработке {message}";
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Console.WriteLine($" [x] Done. {outputText}");
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channel.BasicAck(deliveryTag: ea.DeliveryTag, multiple: false);
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};
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channel.BasicConsume(queue: "accepted",
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autoAck: false,
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consumer: consumer);
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Console.WriteLine(" Press [enter] to exit.");
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Console.ReadLine();
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```
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3. Consumer 3:
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```
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using System.Text;
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using RabbitMQ.Client;
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using RabbitMQ.Client.Events;
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var factory = new ConnectionFactory { HostName = "localhost" };
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using var connection = factory.CreateConnection();
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using var channel = connection.CreateModel();
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Random rand = new Random();
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string queueName = $"denied{rand.Next()}";
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channel.QueueDeclare(queue: queueName);
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channel.QueueBind(queue: queueName,
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exchange: "report",
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routingKey: string.Empty);
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Console.WriteLine(" [*] Waiting for messages.");
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var consumer = new EventingBasicConsumer(channel);
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consumer.Received += async (model, ea) =>
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{
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byte[] body = ea.Body.ToArray();
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var message = Encoding.UTF8.GetString(body);
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int waitTime = rand.Next(20, 90);
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Thread.Sleep(waitTime * 100);
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string outputText = $"Заявление обработано {message} за {waitTime} минут";
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Console.WriteLine($" [x] Done. {outputText}");
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channel.BasicAck(deliveryTag: ea.DeliveryTag, multiple: false);
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};
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channel.BasicConsume(queue: queueName,
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autoAck: false,
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consumer: consumer);
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Console.WriteLine(" Press [enter] to exit.");
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Console.ReadLine();
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```
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## Результаты выполнения работы
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Запуск каждой программы:
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Результаты обработки:
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Вывод: Consumer_2 нагружает меньше памяти, чем Consumer_1 и принимает сообщения гораздо быстрее, тем самым не позволяя очереди накапливать огромное количество сообщений
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