UA-.NETStandard/samples/ConsoleReferencePubSubClient/ConsoleLoggingSink.cs

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using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Extensions.Logging;
using Opc.Ua.PubSub.DataSets;
using Opc.Ua.PubSub.Encoding;

namespace Quickstarts.ConsoleReferencePubSubClient
{
    /// <summary>
    /// <see cref="ISubscribedDataSetSink"/> that prints every received
    /// DataSetMessage to the console via an
    /// <see cref="ILogger"/>. Demonstrates the Part 14 §6.2.9 sink
    /// extension point.
    /// </summary>
    public sealed class ConsoleLoggingSink : ISubscribedDataSetSink
    {
        private readonly ILogger m_logger;
        private long m_received;

        public ConsoleLoggingSink(ILogger logger)
        {
            if (logger is null)
            {
                throw new ArgumentNullException(nameof(logger));
            }
            m_logger = logger;
        }

        public ValueTask WriteAsync(
            IReadOnlyList<DataSetField> fields,
            CancellationToken cancellationToken = default)
        {
            cancellationToken.ThrowIfCancellationRequested();
            if (m_logger.IsEnabled(LogLevel.Information))
            {
                long sequence = Interlocked.Increment(ref m_received);
                var builder = new StringBuilder();
                for (int i = 0; i < fields.Count; i++)
                {
                    DataSetField field = fields[i];
                    if (i > 0)
                    {
                        builder.Append(", ");
                    }
                    builder
                        .Append(string.IsNullOrEmpty(field.Name) ? $"f{i}" : field.Name)
                        .Append('=')
                        .Append(field.Value.IsNull ? "(null)" : field.Value.ToString());
                }

                string fieldsText = builder.ToString();
                m_logger.DataSetReceived(sequence, fields.Count, fieldsText);
            }

            return ValueTask.CompletedTask;
        }
    }

    internal static partial class ConsoleLoggingSinkLog
    {
        [LoggerMessage(EventId = ConsoleReferencePubSubClientEventIds.ConsoleLoggingSink + 0,
            Level = LogLevel.Information,
            Message = "DataSet #{Sequence} received ({FieldCount} fields): {Fields}")]
        public static partial void DataSetReceived(
            this ILogger logger,
            long sequence,
            int fieldCount,
            string fields);
    }
}