Use ref int instead of callback for progress

Solver/Solver.cs

@@ -22,20 +22,18 @@ public sealed class Solver : IDisposable
     private int progress;
     private int maxProgress;
 
+    // In iterative algorithms, the value can be reset back to 0.
+    // In other algorithms, the value increases monotonically.
+    public int ProgressValue => progress;
+    public int ProgressMax => maxProgress;
+
     public delegate void LogDelegate(string text);
-    public delegate void WorkerProgressDelegate(SolverSolution solution, float score);
-    public delegate void ProgressDelegate(int value, int maxValue);
     public delegate void NewActionDelegate(ActionType action);
     public delegate void SolutionDelegate(SolverSolution solution);
 
     // Print to console or plugin log.
     public event LogDelegate? OnLog;
 
-    // Always called in some form in every algorithm.
-    // In iterative algorithms, the value can be reset back to 0.
-    // In other algorithms, the value increases monotonically.
-    public event ProgressDelegate? OnProgress;
-
     // Always called when a new step is generated.
     public event NewActionDelegate? OnNewAction;
 
@@ -115,27 +113,9 @@ public sealed class Solver : IDisposable
             OnNewAction?.Invoke(sanitizedAction);
     }
 
-    private void IncrementProgress() =>
-        IncrementProgressBy(MCTS.ProgressUpdateFrequency);
-
-    private void IncrementRemainingProgress(int iterations) =>
-        IncrementProgressBy(iterations & MCTS.ProgressUpdateFrequency);
-
-    private void IncrementProgressBy(int value)
-    {
-        OnProgress?.Invoke(Interlocked.Add(ref progress, value), maxProgress);
-    }
-
-    private void IncrementProgressSequence()
+    private void ResetProgress()
     {
         Interlocked.Exchange(ref progress, 0);
-        OnProgress?.Invoke(0, maxProgress);
-    }
-
-    private void SearchWithIncrement(MCTS mcts, int iterations)
-    {
-        mcts.Search(iterations, Token, IncrementProgress);
-        IncrementRemainingProgress(iterations);
     }
 
     private async Task<SolverSolution> SearchStepwiseFurcated()
@@ -167,7 +147,7 @@ public sealed class Solver : IDisposable
                         await semaphore.WaitAsync(Token).ConfigureAwait(false);
                         try
                         {
-                            SearchWithIncrement(solver, iterCount);
+                            solver.Search(iterCount, ref progress, Token);
                         }
                         finally
                         {
@@ -184,7 +164,7 @@ public sealed class Solver : IDisposable
             semaphore.Release(Config.MaxThreadCount);
             await Task.WhenAll(tasks).WaitAsync(Token).ConfigureAwait(false);
             s.Stop();
-            OnLog?.Invoke($"{s.Elapsed.TotalMilliseconds:0.00}ms {Config.Iterations / Config.ForkCount / s.Elapsed.TotalSeconds / 1000:0.00} kI/s/t");
+            OnLog?.Invoke($"{s.Elapsed.TotalMilliseconds:0.00}ms {(float)progress / Config.ForkCount / s.Elapsed.TotalSeconds / 1000:0.00} kI/s/t");
 
             Token.ThrowIfCancellationRequested();
 
@@ -252,7 +232,7 @@ public sealed class Solver : IDisposable
                 }
             }
 
-            IncrementProgressSequence();
+            ResetProgress();
 
             activeStates = newStates;
         }
@@ -292,7 +272,7 @@ public sealed class Solver : IDisposable
                     await semaphore.WaitAsync(Token).ConfigureAwait(false);
                     try
                     {
-                        SearchWithIncrement(solver, iterCount);
+                        solver.Search(iterCount, ref progress, Token);
                     }
                     finally
                     {
@@ -308,7 +288,7 @@ public sealed class Solver : IDisposable
             semaphore.Release(Config.MaxThreadCount);
             await Task.WhenAll(tasks).WaitAsync(Token).ConfigureAwait(false);
             s.Stop();
-            OnLog?.Invoke($"{s.Elapsed.TotalMilliseconds:0.00}ms {Config.Iterations / Config.ForkCount / s.Elapsed.TotalSeconds / 1000:0.00} kI/s/t");
+            OnLog?.Invoke($"{s.Elapsed.TotalMilliseconds:0.00}ms {(float)progress / Config.ForkCount / s.Elapsed.TotalSeconds / 1000:0.00} kI/s/t");
 
             Token.ThrowIfCancellationRequested();
 
@@ -328,7 +308,7 @@ public sealed class Solver : IDisposable
             (_, state) = sim.Execute(state, chosenAction);
             actions.Add(chosenAction);
 
-            IncrementProgressSequence();
+            ResetProgress();
         }
 
         return new(actions, state);
@@ -351,9 +331,9 @@ public sealed class Solver : IDisposable
             var solver = new MCTS(MCTSConfig, state);
 
             var s = Stopwatch.StartNew();
-            SearchWithIncrement(solver, Config.Iterations);
+            solver.Search(Config.Iterations, ref progress, Token);
             s.Stop();
-            OnLog?.Invoke($"{s.Elapsed.TotalMilliseconds:0.00}ms {Config.Iterations / s.Elapsed.TotalSeconds / 1000:0.00} kI/s");
+            OnLog?.Invoke($"{s.Elapsed.TotalMilliseconds:0.00}ms {progress / s.Elapsed.TotalSeconds / 1000:0.00} kI/s");
 
             var solution = solver.Solution();
 
@@ -371,7 +351,7 @@ public sealed class Solver : IDisposable
             (_, state) = sim.Execute(state, chosenAction);
             actions.Add(chosenAction);
 
-            IncrementProgressSequence();
+            ResetProgress();
         }
 
         return Task.FromResult(new SolverSolution(actions, state));
@@ -383,6 +363,7 @@ public sealed class Solver : IDisposable
         maxProgress = iterCount * Config.ForkCount;
 
         using var semaphore = new SemaphoreSlim(0, Config.MaxThreadCount);
+        var s = Stopwatch.StartNew();
         var tasks = new Task<(float MaxScore, SolverSolution Solution)>[Config.ForkCount];
         for (var i = 0; i < Config.ForkCount; ++i)
             tasks[i] = Task.Run(async () =>
@@ -391,7 +372,7 @@ public sealed class Solver : IDisposable
                 await semaphore.WaitAsync(Token).ConfigureAwait(false);
                 try
                 {
-                    SearchWithIncrement(solver, iterCount);
+                    solver.Search(iterCount, ref progress, Token);
                 }
                 finally
                 {
@@ -406,6 +387,8 @@ public sealed class Solver : IDisposable
             }, Token);
         semaphore.Release(Config.MaxThreadCount);
         await Task.WhenAll(tasks).WaitAsync(Token).ConfigureAwait(false);
+        s.Stop();
+        OnLog?.Invoke($"{s.Elapsed.TotalMilliseconds:0.00}ms {(float)progress / Config.ForkCount / s.Elapsed.TotalSeconds / 1000:0.00} kI/s/t");
 
         var solution = tasks.Select(t => t.Result).MaxBy(r => r.MaxScore).Solution;
         foreach (var action in solution.Actions)
@@ -419,7 +402,12 @@ public sealed class Solver : IDisposable
         maxProgress = Config.Iterations;
 
         var solver = new MCTS(MCTSConfig, State);
-        SearchWithIncrement(solver, Config.Iterations);
+
+        var s = Stopwatch.StartNew();
+        solver.Search(Config.Iterations, ref progress, Token);
+        s.Stop();
+        OnLog?.Invoke($"{s.Elapsed.TotalMilliseconds:0.00}ms {progress / s.Elapsed.TotalSeconds / 1000:0.00} kI/s");
+
         var solution = solver.Solution();
         foreach (var action in solution.Actions)
             InvokeNewAction(action);