NLog-NLog/tests/NLog.UnitTests/LayoutRenderers/Wrappers/CachedTests.cs

//
// Copyright (c) 2004-2024 Jaroslaw Kowalski <jaak@jkowalski.net>, Kim Christensen, Julian Verdurmen
//
// All rights reserved.
//
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// modification, are permitted provided that the following conditions
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// * Redistributions of source code must retain the above copyright notice,
//   this list of conditions and the following disclaimer.
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//   contributors may be used to endorse or promote products derived from this
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using NLog.Config;

namespace NLog.UnitTests.LayoutRenderers.Wrappers
{
    using System;
    using System.Linq;
    using NLog;
    using NLog.Layouts;
    using Xunit;

    public class CachedTests : NLogTestBase
    {
        [Fact]
        public void CachedLayoutRendererWrapper()
        {
            SimpleLayout l = "${guid}";

            string s1 = l.Render(LogEventInfo.CreateNullEvent());
            string s2 = l.Render(LogEventInfo.CreateNullEvent());
            string s3;

            // normally GUIDs are never the same
            Assert.NotEqual(s1, s2);

            // but when you apply ${cached}, the guid will only be generated once
            l = "${cached:${guid}:cached=true}";
            s1 = l.Render(LogEventInfo.CreateNullEvent());
            s2 = l.Render(LogEventInfo.CreateNullEvent());
            Assert.Equal(s1, s2);

            // calling Close() on Layout Renderer will reset the cached value
            l.LayoutRenderers.First().Close();
            s3 = l.Render(LogEventInfo.CreateNullEvent());
            Assert.NotEqual(s2, s3);

            // unless we use clearcache=none
            l = "${cached:${guid}:cached=true:clearcache=none}";
            s1 = l.Render(LogEventInfo.CreateNullEvent());
            l.LayoutRenderers.First().Close();
            s2 = l.Render(LogEventInfo.CreateNullEvent());
            Assert.Equal(s1, s2);

            // another way to achieve the same thing is using cached=true
            l = "${guid:cached=true}";
            s1 = l.Render(LogEventInfo.CreateNullEvent());
            s2 = l.Render(LogEventInfo.CreateNullEvent());
            Assert.Equal(s1, s2);

            // another way to achieve the same thing is using cached=true
            l = "${guid:cached=false}";
            s1 = l.Render(LogEventInfo.CreateNullEvent());
            s2 = l.Render(LogEventInfo.CreateNullEvent());
            Assert.NotEqual(s1, s2);
        }

        /// <summary>
        /// test the cachekey
        /// </summary>
        [Fact]
        public void CacheKeyTest()
        {
            LogManager.Configuration = XmlLoggingConfiguration.CreateFromXmlString(@"
            <nlog>
                <targets><target name='debug' type='debug' layout='${cached:${guid}:cached=true:cachekey=${var:var1}}' /></targets>
                <rules>
                    <logger name='*' minlevel='debug' appendto='debug'>

                    </logger>
                </rules>
            </nlog>");
            LogManager.Configuration.Variables["var1"] = "a";

            var logger = LogManager.GetLogger("A");
            logger.Debug("msg");
            var s1 = GetDebugLastMessage("debug");
            logger.Debug("msg");
            var s2 = GetDebugLastMessage("debug");
            Assert.NotEmpty(s1);
            Assert.Equal(s1, s2);
            //change var will reset cache
            LogManager.Configuration.Variables["var1"] = "b";
            logger.Debug("msg");
            var s3 = GetDebugLastMessage("debug");
            Assert.NotEmpty(s3);
            Assert.NotEqual(s1, s3);
        }

        [Fact]
        public void CachedSecondsTimeoutTest()
        {
            SimpleLayout l = "${guid:cachedSeconds=60}";
            var s1 = l.Render(LogEventInfo.CreateNullEvent());
            var s2 = l.Render(new LogEventInfo());
            Assert.Equal(s1, s2);
            var s3 = l.Render(new LogEventInfo() { TimeStamp = NLog.Time.TimeSource.Current.Time.AddMinutes(2) });
            Assert.NotEqual(s2, s3);
        }

        [Fact]
        public void CachedUntilHourChangeTest()
        {
            SimpleLayout l = "${guid:cachedUntil=HourChange}";
            var timeStamp = new DateTime(2021, 2, 27, 17, 30, 0);
            var s1 = l.Render(new LogEventInfo() { TimeStamp = timeStamp });
            var s2 = l.Render(new LogEventInfo() { TimeStamp = timeStamp.AddMinutes(29) });
            Assert.Equal(s1, s2);
            var s3 = l.Render(new LogEventInfo() { TimeStamp = timeStamp.AddMinutes(30) });
            Assert.NotEqual(s2, s3);
        }

        [Fact]
        public void CachedUntilDayChangeTest()
        {
            SimpleLayout l = "${guid:cachedUntil=DayChange}";
            var timeStamp = new DateTime(2021, 2, 27, 17, 30, 0);
            var s1 = l.Render(new LogEventInfo() { TimeStamp = timeStamp });
            var s2 = l.Render(new LogEventInfo() { TimeStamp = timeStamp.AddHours(6) });
            Assert.Equal(s1, s2);
            var s3 = l.Render(new LogEventInfo() { TimeStamp = timeStamp.AddHours(6.5) });
            Assert.NotEqual(s2, s3);
        }

        [Theory]
        [InlineData("HourChange")]
        [InlineData("DayChange")]
        public void CachedUntilLastPeriodTest(string cachedUntil)
        {
            SimpleLayout l = "${guid:cachedUntil=" + cachedUntil + "}";
            var s1 = l.Render(new LogEventInfo() { TimeStamp = DateTime.MaxValue.AddMinutes(-30) });
            var s2 = l.Render(new LogEventInfo() { TimeStamp = DateTime.MaxValue });
            Assert.NotEmpty(s1);
            Assert.Equal(s1, s2);
        }
    }
}