Allow configuration of number of JavaScript engines in the pool in IReactSiteConfiguration

Author: Daniel15

src/React/IReactSiteConfiguration.cs

@@ -77,5 +77,27 @@ public interface IReactSiteConfiguration
 		/// Sets whether Flow types should be stripped out.
 		/// </summary>
 		IReactSiteConfiguration SetStripTypes(bool stripTypes);
+
+		/// <summary>
+		/// Gets or sets the number of engines to initially start when a pool is created. 
+		/// Defaults to <c>10</c>.
+		/// </summary>
+		int? StartEngines { get; set; }
+		/// <summary>
+		/// Sets the number of engines to initially start when a pool is created. 
+		/// Defaults to <c>10</c>.
+		/// </summary>
+		IReactSiteConfiguration SetStartEngines(int? startEngines);
+
+		/// <summary>
+		/// Gets or sets the maximum number of engines that will be created in the pool. 
+		/// Defaults to <c>25</c>.
+		/// </summary>
+		int? MaxEngines { get; set; }
+		/// <summary>
+		/// Sets the maximum number of engines that will be created in the pool. 
+		/// Defaults to <c>25</c>.
+		/// </summary>
+		IReactSiteConfiguration SetMaxEngines(int? maxEngines);
 	}
 }

src/React/JavaScriptEngineFactory.cs

@@ -107,11 +107,21 @@ IFileSystem fileSystem
 		/// </summary>
 		protected virtual IJsPool CreatePool()
 		{
-			return new JsPool(new JsPoolConfig
+			var poolConfig = new JsPoolConfig
 			{
 				EngineFactory = _factory,
 				Initializer = InitialiseEngine,
-			});
+			};
+			if (_config.MaxEngines != null)
+			{
+				poolConfig.MaxEngines = _config.MaxEngines.Value;
+			}
+			if (_config.StartEngines != null)
+			{
+				poolConfig.StartEngines = _config.StartEngines.Value;
+			}
+
+			return new JsPool(poolConfig);
 		}
 
 		/// <summary>

src/React/ReactSiteConfiguration.cs

@@ -124,5 +124,35 @@ public IReactSiteConfiguration SetStripTypes(bool stripTypes)
 			StripTypes = stripTypes;
 			return this;
 		}
+
+		/// <summary>
+		/// Gets or sets the number of engines to initially start when a pool is created. 
+		/// Defaults to <c>10</c>.
+		/// </summary>
+		public int? StartEngines { get; set; }
+		/// <summary>
+		/// Sets the number of engines to initially start when a pool is created. 
+		/// Defaults to <c>10</c>.
+		/// </summary>
+		public IReactSiteConfiguration SetStartEngines(int? startEngines)
+		{
+			StartEngines = startEngines;
+			return this;
+		}
+
+		/// <summary>
+		/// Gets or sets the maximum number of engines that will be created in the pool. 
+		/// Defaults to <c>25</c>.
+		/// </summary>
+		public int? MaxEngines { get; set; }
+		/// <summary>
+		/// Sets the maximum number of engines that will be created in the pool. 
+		/// Defaults to <c>25</c>.
+		/// </summary>
+		public IReactSiteConfiguration SetMaxEngines(int? maxEngines)
+		{
+			MaxEngines = maxEngines;
+			return this;
+		}
 	}
 }