Refactored to use RX

WhiteRabbit/App.config

@@ -1,6 +1,14 @@
-<?xml version="1.0" encoding="utf-8" ?>
+<?xml version="1.0" encoding="utf-8"?>
 <configuration>
     <startup> 
         <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6" />
     </startup>
+  <runtime>
+    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
+      <dependentAssembly>
+        <assemblyIdentity name="System.Reactive.Core" publicKeyToken="94bc3704cddfc263" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-3.0.3000.0" newVersion="3.0.3000.0" />
+      </dependentAssembly>
+    </assemblyBinding>
+  </runtime>
 </configuration>

WhiteRabbit/Program.cs

@@ -5,6 +5,8 @@
     using System.Diagnostics;
     using System.Linq;
     using System.Numerics;
+    using System.Reactive.Concurrency;
+    using System.Reactive.Linq;
     using System.Security.Cryptography;
     using System.Text;
 
@@ -31,11 +33,18 @@
 
             var expectedHashesAsVectors = new HashSet<Vector<byte>>(expectedHashes.Select(hash => new Vector<byte>(StringToByteArray(hash))));
 
-            foreach (var result in AddHashes(processor.GeneratePhrases(ReadInput())))
+            var phrases = processor.GeneratePhrases(ReadInput());
+            using (var hasher = MD5.Create())
             {
-                if (expectedHashesAsVectors.Contains(result.Item2))
+                var phrasesWithHashes = phrases
+                    .Select(phrase => new { phrase, hash = ComputeHash(hasher, phrase) })
+                    .SubscribeOn(NewThreadScheduler.Default);
+
+                var filteredPhrases = phrasesWithHashes.Where(tuple => expectedHashesAsVectors.Contains(tuple.hash));
+
+                foreach (var result in filteredPhrases.ToEnumerable())
                 {
-                    Console.WriteLine($"Found phrase: {result.Item1} (spent {stopwatch.Elapsed})");
+                    Console.WriteLine($"Found phrase with hash {HashToString(result.hash)}: {result.phrase} (spent {stopwatch.Elapsed})");
                 }
             }
 
@@ -52,16 +61,14 @@
                              .ToArray();
         }
 
-        private static IEnumerable<Tuple<string, Vector<byte>>> AddHashes(IEnumerable<string> input)
+        private static Vector<byte> ComputeHash(HashAlgorithm hasher, string phrase)
         {
-            using (MD5 hasher = MD5.Create())
-            {
-                foreach (var line in input)
-                {
-                    var data = hasher.ComputeHash(Encoding.ASCII.GetBytes(line));
-                    yield return Tuple.Create(line, new Vector<byte>(data));
-                }
-            }
+            return new Vector<byte>(hasher.ComputeHash(Encoding.ASCII.GetBytes(phrase)));
+        }
+
+        private static string HashToString(Vector<byte> hash)
+        {
+            return string.Concat(Enumerable.Range(0, 16).Select(i => hash[i].ToString("x2")));
         }
 
         private static IEnumerable<string> ReadInput()

WhiteRabbit/StringsProcessor.cs

@@ -1,8 +1,11 @@
 namespace WhiteRabbit
 {
+    using System;
     using System.Collections.Generic;
     using System.Collections.Immutable;
     using System.Linq;
+    using System.Reactive.Concurrency;
+    using System.Reactive.Linq;
 
     internal class StringsProcessor
     {
@@ -20,7 +23,7 @@
 
         private VectorsProcessor VectorsProcessor { get; }
 
-        public IEnumerable<string> GeneratePhrases(IEnumerable<string> words)
+        public IObservable<string> GeneratePhrases(IEnumerable<string> words)
         {
             // Dictionary of vectors to array of words represented by this vector
             var formattedWords = words
@@ -32,15 +35,17 @@
                 .ToDictionary(group => group.Key, group => group.Select(tuple => tuple.word).ToArray());
 
             // task of finding anagrams could be reduced to the task of finding sequences of dictionary vectors with the target sum
-            var sums = this.VectorsProcessor.GenerateSequences(formattedWords.Keys);
+            var sums = this.VectorsProcessor.GenerateSequences(formattedWords.Keys).ObserveOn(Scheduler.Default);
 
             // converting sequences of vectors to the sequences of words...
             var anagramsWords = sums
                 .Select(sum => ImmutableStack.Create(sum.Select(vector => formattedWords[vector]).ToArray()))
                 .SelectMany(this.Flatten)
-                .Select(stack => stack.ToArray());
+                .Select(stack => stack.ToArray())
+                .SubscribeOn(NewThreadScheduler.Default);
 
-            return anagramsWords.Select(list => string.Join(" ", list));
+            return anagramsWords.Select(list => string.Join(" ", list))
+                .SubscribeOn(NewThreadScheduler.Default);
         }
 
         // Converts e.g. pair of variants [[a, b, c], [d, e]] into all possible pairs: [[a, d], [a, e], [b, d], [b, e], [c, d], [c, e]]

WhiteRabbit/VectorsProcessor.cs

@@ -6,6 +6,8 @@
     using System.Diagnostics;
     using System.Linq;
     using System.Numerics;
+    using System.Reactive.Concurrency;
+    using System.Reactive.Linq;
 
     internal class VectorsProcessor
     {
@@ -33,12 +35,18 @@
         private long Iterations { get; set; } = 0;
 
         // Produces all sequences of vectors with the target sum
-        public IEnumerable<Vector<byte>[]> GenerateSequences(IEnumerable<Vector<byte>> vectors)
+        public IObservable<Vector<byte>[]> GenerateSequences(IReadOnlyCollection<Vector<byte>> vectors)
         {
             var filteredVectors = this.FilterVectors(vectors);
             var dictionary = ImmutableStack.Create(filteredVectors.ToArray());
-            var unorderedSequences = this.GenerateUnorderedSequences(this.Target, ImmutableStack.Create<Vector<byte>>(), dictionary);
-            var allSequences = unorderedSequences.SelectMany(this.GeneratePermutations);
+
+            var unorderedSequences = this.GenerateUnorderedSequences(this.Target, ImmutableStack.Create<Vector<byte>>(), dictionary)
+                .ToObservable()
+                .SubscribeOn(NewThreadScheduler.Default);
+
+            var allSequences = unorderedSequences
+                .SelectMany(this.GeneratePermutations)
+                .SubscribeOn(NewThreadScheduler.Default);
 
             return allSequences;
         }
@@ -59,7 +67,7 @@
             return weight;
         }
 
-        private IEnumerable<Vector<byte>> FilterVectors(IEnumerable<Vector<byte>> vectors)
+        private IEnumerable<Vector<byte>> FilterVectors(IReadOnlyCollection<Vector<byte>> vectors)
         {
             return vectors
                 .Where(vector => ((this.Target - vector) & Negative) == Vector<byte>.Zero)

WhiteRabbit/WhiteRabbit.csproj

@@ -45,12 +45,34 @@
       <HintPath>..\packages\System.Numerics.Vectors.4.3.0\lib\net46\System.Numerics.Vectors.dll</HintPath>
       <Private>True</Private>
     </Reference>
+    <Reference Include="System.Reactive.Core, Version=3.0.3000.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263, processorArchitecture=MSIL">
+      <HintPath>..\packages\System.Reactive.Core.3.1.1\lib\net46\System.Reactive.Core.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="System.Reactive.Interfaces, Version=3.0.1000.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263, processorArchitecture=MSIL">
+      <HintPath>..\packages\System.Reactive.Interfaces.3.1.1\lib\net45\System.Reactive.Interfaces.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="System.Reactive.Linq, Version=3.0.3000.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263, processorArchitecture=MSIL">
+      <HintPath>..\packages\System.Reactive.Linq.3.1.1\lib\net46\System.Reactive.Linq.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="System.Reactive.PlatformServices, Version=3.0.3000.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263, processorArchitecture=MSIL">
+      <HintPath>..\packages\System.Reactive.PlatformServices.3.1.1\lib\net46\System.Reactive.PlatformServices.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="System.Reactive.Windows.Threading, Version=3.0.1000.0, Culture=neutral, PublicKeyToken=94bc3704cddfc263, processorArchitecture=MSIL">
+      <HintPath>..\packages\System.Reactive.Windows.Threading.3.1.1\lib\net45\System.Reactive.Windows.Threading.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="System.Windows" />
     <Reference Include="System.Xml.Linq" />
     <Reference Include="System.Data.DataSetExtensions" />
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="System.Data" />
     <Reference Include="System.Net.Http" />
     <Reference Include="System.Xml" />
+    <Reference Include="WindowsBase" />
   </ItemGroup>
   <ItemGroup>
     <Compile Include="PrecomputedPermutationsGenerator.cs" />

WhiteRabbit/packages.config

@@ -2,4 +2,10 @@
 <packages>
   <package id="System.Collections.Immutable" version="1.3.1" targetFramework="net46" />
   <package id="System.Numerics.Vectors" version="4.3.0" targetFramework="net46" />
+  <package id="System.Reactive" version="3.1.1" targetFramework="net46" />
+  <package id="System.Reactive.Core" version="3.1.1" targetFramework="net46" />
+  <package id="System.Reactive.Interfaces" version="3.1.1" targetFramework="net46" />
+  <package id="System.Reactive.Linq" version="3.1.1" targetFramework="net46" />
+  <package id="System.Reactive.PlatformServices" version="3.1.1" targetFramework="net46" />
+  <package id="System.Reactive.Windows.Threading" version="3.1.1" targetFramework="net46" />
 </packages>