Remove Uri.TryParse and replace with Span<char> parsing

src/benchmark/Akka.Benchmarks/Actor/ActorPathBenchmarks.cs

@@ -16,12 +16,16 @@ public class ActorPathBenchmarks
     {
         private ActorPath x;
         private ActorPath y;
+        private ActorPath _childPath;
+        private Address _sysAdr = new Address("akka.tcp", "system", "127.0.0.1", 1337);
+        private Address _otherAdr = new Address("akka.tcp", "system", "127.0.0.1", 1338);
 
         [GlobalSetup]
         public void Setup()
         {
-            x = new RootActorPath(new Address("akka.tcp", "system", "127.0.0.1", 1337), "user");
-            y = new RootActorPath(new Address("akka.tcp", "system", "127.0.0.1", 1337), "system");
+            x = new RootActorPath(_sysAdr, "user");
+            y = new RootActorPath(_sysAdr, "system");
+            _childPath = x / "parent" / "child";
         }
 
         [Benchmark]
@@ -45,7 +49,19 @@ public bool ActorPath_Equals()
         [Benchmark]
         public string ActorPath_ToString()
         {
-            return x.ToString();
+            return _childPath.ToString();
+        }
+
+        [Benchmark]
+        public string ActorPath_ToSerializationFormat()
+        {
+            return _childPath.ToSerializationFormat();
+        }
+
+        [Benchmark]
+        public string ActorPath_ToSerializationFormatWithAddress()
+        {
+            return _childPath.ToSerializationFormatWithAddress(_otherAdr);
         }
     }
 }

src/benchmark/Akka.Benchmarks/Actor/NameAndUidBenchmarks.cs

@@ -0,0 +1,34 @@
+//-----------------------------------------------------------------------
+// <copyright file="NameAndUidBenchmarks.cs" company="Akka.NET Project">
+//     Copyright (C) 2009-2021 Lightbend Inc. <http://www.lightbend.com>
+//     Copyright (C) 2013-2021 .NET Foundation <https://github.com/akkadotnet/akka.net>
+// </copyright>
+//-----------------------------------------------------------------------
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Akka.Actor;
+using Akka.Benchmarks.Configurations;
+using BenchmarkDotNet.Attributes;
+
+namespace Akka.Benchmarks.Actor
+{
+    [Config(typeof(MicroBenchmarkConfig))]
+    public class NameAndUidBenchmarks
+    {
+        public const string ActorPath = "foo#11241311";
+
+        [Benchmark]
+        public NameAndUid ActorCell_SplitNameAndUid()
+        {
+            return ActorCell.SplitNameAndUid(ActorPath);
+        }
+
+        [Benchmark]
+        public (string name, int uid) ActorCell_GetNameAndUid()
+        {
+            return ActorCell.GetNameAndUid(ActorPath);
+        }
+    }
+}

src/core/Akka.API.Tests/CoreAPISpec.ApproveCore.approved.txt

@@ -115,6 +115,7 @@ namespace Akka.Actor
         protected bool SetChildrenTerminationReason(Akka.Actor.Internal.SuspendReason reason) { }
         public void SetReceiveTimeout(System.Nullable<System.TimeSpan> timeout = null) { }
         protected void SetTerminated() { }
+        [System.ObsoleteAttribute("Not used. Will be removed in Akka.NET v1.5.")]
         public static Akka.Actor.NameAndUid SplitNameAndUid(string name) { }
         public virtual void Start() { }
         protected void Stash(Akka.Dispatch.SysMsg.SystemMessage msg) { }
@@ -1325,6 +1326,7 @@ namespace Akka.Actor
         public override void Suspend() { }
         protected override void TellInternal(object message, Akka.Actor.IActorRef sender) { }
     }
+    [System.ObsoleteAttribute("Not used. Will be removed in Akka.NET v1.5.")]
     public class NameAndUid
     {
         public NameAndUid(string name, int uid) { }

src/core/Akka.Remote/RemoteSystemDaemon.cs

@@ -308,10 +308,10 @@ public override IActorRef GetChild(IEnumerable<string> name)
             var n = 0;
             while (true)
             {
-                var nameAndUid = ActorCell.SplitNameAndUid(path);
-                if (TryGetChild(nameAndUid.Name, out var child))
+                var (s, uid) = ActorCell.GetNameAndUid(path);
+                if (TryGetChild(s, out var child))
                 {
-                    if (nameAndUid.Uid != ActorCell.UndefinedUid && nameAndUid.Uid != child.Path.Uid)
+                    if (uid != ActorCell.UndefinedUid && uid != child.Path.Uid)
                         return Nobody.Instance;
                     return n == 0 ? child : child.GetChild(name.TakeRight(n));
                 }

src/core/Akka.Remote/Serialization/LruBoundedCache.cs

@@ -25,7 +25,7 @@ internal static class FastHash
         /// <returns>A 32-bit pseudo-random hash value.</returns>
         public static int OfString(string s)
         {
-            var chars = s.ToCharArray();
+            var chars = s.AsSpan();
             var s0 = 391408L; // seed value 1, DON'T CHANGE
             var s1 = 601258L; // seed value 2, DON'T CHANGE
             unchecked

src/core/Akka.Tests/Actor/ActorSelectionSpec.cs

@@ -76,12 +76,10 @@ private IActorRef AskNode(IActorRef node, IQuery query)
         {
             var result = node.Ask(query).Result;
 
-            var actorRef = result as IActorRef;
-            if (actorRef != null)
+            if (result is IActorRef actorRef)
                 return actorRef;
 
-            var selection = result as ActorSelection;
-            return selection != null ? Identify(selection) : null;
+            return result is ActorSelection selection ? Identify(selection) : null;
         }
 
         [Fact]

src/core/Akka/Actor/ActorCell.Children.cs

@@ -387,17 +387,16 @@ public bool TryGetSingleChild(string name, out IInternalActorRef child)
             }
             else
             {
-                var nameAndUid = SplitNameAndUid(name);
-                if (TryGetChildRestartStatsByName(nameAndUid.Name, out var stats))
+                var (s, uid) = GetNameAndUid(name);
+                if (TryGetChildRestartStatsByName(s, out var stats))
                 {
-                    var uid = nameAndUid.Uid;
                     if (uid == ActorCell.UndefinedUid || uid == stats.Uid)
                     {
                         child = stats.Child;
                         return true;
                     }
                 }
-                else if (TryGetFunctionRef(nameAndUid.Name, nameAndUid.Uid, out var functionRef))
+                else if (TryGetFunctionRef(s, uid, out var functionRef))
                 {
                     child = functionRef;
                     return true;

src/core/Akka/Actor/ActorCell.cs

@@ -479,10 +479,11 @@ protected void SetActorFields(ActorBase actor)
             actor?.Unclear();
         }
         /// <summary>
-        /// TBD
+        /// INTERNAL API
         /// </summary>
         /// <param name="name">TBD</param>
         /// <returns>TBD</returns>
+        [Obsolete("Not used. Will be removed in Akka.NET v1.5.")]
         public static NameAndUid SplitNameAndUid(string name)
         {
             var i = name.IndexOf('#');
@@ -491,6 +492,19 @@ public static NameAndUid SplitNameAndUid(string name)
                 : new NameAndUid(name.Substring(0, i), Int32.Parse(name.Substring(i + 1)));
         }
 
+        /// <summary>
+        /// INTERNAL API
+        /// </summary>
+        /// <param name="name">The full name of the actor, including the UID if known</param>
+        /// <returns>A new (string name, int uid) instance.</returns>
+        internal static (string name, int uid) GetNameAndUid(string name)
+        {
+            var i = name.IndexOf('#');
+            return i < 0
+                ? (name, UndefinedUid)
+                : (name.Substring(0, i), SpanHacks.Parse(name.AsSpan(i + 1)));
+        }
+
         /// <summary>
         /// TBD
         /// </summary>