From 8cb2675b8a3cebdb775aac26937b6c205662b3bf Mon Sep 17 00:00:00 2001
From: Harald Wolff <haraldwolff@pc-harald.waldrennach.l--n.de>
Date: Mon, 18 Mar 2019 08:12:51 +0100
Subject: [PATCH] WIP

---
 MemoryLogger.cs   | 110 ++++++++++++++++++++++++++++++++++++++++++++++
 ln.logging.csproj |   1 +
 2 files changed, 111 insertions(+)
 create mode 100644 MemoryLogger.cs

diff --git a/MemoryLogger.cs b/MemoryLogger.cs
new file mode 100644
index 0000000..a718e13
--- /dev/null
+++ b/MemoryLogger.cs
@@ -0,0 +1,110 @@
+// /**
+//  * File: MemoryLogger.cs
+//  * Author: haraldwolff
+//  *
+//  * This file and it's content is copyrighted by the Author and / or copyright holder.
+//  * Any use wihtout proper permission is illegal and may lead to legal actions.
+//  *
+//  *
+//  **/
+using System;
+using ln.logging;
+using System.Linq;
+namespace sharp.logging
+{
+    public class MemoryLogger : ILoggingBackend
+    {
+        private LogEntry[] Entries = new LogEntry[256];
+        private int CurrentLogPointer = 255;
+
+        public MemoryLogger()
+        {
+        }
+
+        public MemoryLogger(int bufferLength)
+        {
+            Entries = new LogEntry[bufferLength];
+            CurrentLogPointer = Entries.Length - 1;
+        }
+
+        public LogLevel MinLogLevel { get; set; } = LogLevel.FATAL;
+        public LogLevel MaxLogLevel { get; set; } = LogLevel.INFO;
+
+        public void Message(LogLevel logLevel, string[] lines)
+        {
+            lock (this)
+            {
+                Entries[CurrentLogPointer].LogLevel = logLevel;
+                Entries[CurrentLogPointer].Lines = String.Join("\n", lines);
+                CurrentLogPointer = NextLogPointer;
+            }
+        }
+
+        public LogEntry[] GetLogEntries()
+        {
+            lock (this)
+            {
+                LogEntry[] prepare = new LogEntry[Entries.Length];
+                if (CurrentLogPointer == (Entries.Length - 1))
+                {
+                    Array.Copy(Entries, prepare, Entries.Length);
+                }
+                else
+                {
+                    Array.Copy(Entries, PreviousLogPointer, prepare, 0, Entries.Length - PreviousLogPointer);
+                    Array.Copy(Entries, 0, prepare, Entries.Length - PreviousLogPointer, PreviousLogPointer);
+                }
+
+                return prepare.Where((x) => x.Lines != null).ToArray();
+            }
+        }
+        public LogEntry[] GetLogEntries(LogLevel maxLogLevel)
+        {
+            lock (this)
+            {
+                LogEntry[] prepare = new LogEntry[Entries.Length];
+                if (CurrentLogPointer == (Entries.Length - 1))
+                {
+                    Array.Copy(Entries, prepare, Entries.Length);
+                }
+                else
+                {
+                    Array.Copy(Entries, PreviousLogPointer, prepare, 0, Entries.Length - PreviousLogPointer);
+                    Array.Copy(Entries, 0, prepare, Entries.Length - PreviousLogPointer, PreviousLogPointer);
+                }
+
+                return prepare.Where((x) => (x.Lines != null) && (maxLogLevel >= x.LogLevel)).ToArray();
+            }
+        }
+
+        private int NextLogPointer
+        {
+            get
+            {
+                int current = CurrentLogPointer;
+                current--;
+                if (current < 0)
+                    current = Entries.Length - 1;
+                return current;
+            }
+        }
+        private int PreviousLogPointer
+        {
+            get
+            {
+                int current = CurrentLogPointer;
+                current++;
+                if (current >= Entries.Length)
+                    current = 0;
+                return current;
+            }
+        }
+
+
+        public struct LogEntry
+        {
+            public LogLevel LogLevel;
+            public string Lines;
+        }
+    }
+}
diff --git a/ln.logging.csproj b/ln.logging.csproj
index e922911..576a2d4 100644
--- a/ln.logging.csproj
+++ b/ln.logging.csproj
@@ -39,6 +39,7 @@
     <Compile Include="ILoggingBackend.cs" />
     <Compile Include="LoggingWriter.cs" />
     <Compile Include="LoggingBackend.cs" />
+    <Compile Include="MemoryLogger.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
 </Project>
\ No newline at end of file