Set verson to 1.2.1

Added null-check for creator in validate
Simlivied constructor using default values

ManagedPool/ManagedPool.csproj

@@ -4,7 +4,7 @@
     <TargetFramework>netcoreapp2.1</TargetFramework>
     <SignAssembly>false</SignAssembly>
     <RootNamespace>eu.railduction.netcore.dll.ManagedPool</RootNamespace>
-    <Version>1.1.0</Version>
+    <Version>1.2.1</Version>
     <PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>
     <DelaySign>true</DelaySign>
     <AssemblyOriginatorKeyFile>eu.railduction_assembly-key.pfx</AssemblyOriginatorKeyFile>

ManagedPool/Pool_T_.cs

@@ -7,25 +7,23 @@ using System.Threading.Tasks;
 namespace eu.railduction.netcore.dll.ManagedPool
 {
     public class Pool<T> where T : class
-    {
+    { 
-        private ConcurrentStack<T> pool = new ConcurrentStack<T>();
-        private int current = 0, max = 100, min = 10, batch = 5, increaseBuffer = 5, decreaseBuffer = 10;
-
         private Func<T> creator;
-        private Action<T> destructor;
-        private Func<T, bool> healthChecker = (T) => { return true; };
-
-        #region Attribute declaration
         /// <summary>Method to handle item-spawning (needs to return the item-type)</summary>
         public Func<T> Creator { get => creator; set => creator = value; }
 
-        /// <summary>Method to handle item-deleting/killing (needs to take the item-type as parameter)</summary>
+        private Func<T, bool> healthChecker = (T) => { return true; };
-        public Action<T> Destructor { get => destructor; set => destructor = value; }
-
         /// <summary>Method to handle item-health-checking (useful for unstable items)
         /// <para/>While running the health-check, the Thread will be blocked!</summary>
         public Func<T, bool> HealthChecker { get => healthChecker; set => healthChecker = value; }
 
+        private Action<T> destructor;
+        /// <summary>Method to handle item-deleting/killing (needs to take the item-type as parameter)</summary>
+        public Action<T> Destructor { get => destructor; set => destructor = value; }
+
+        private ConcurrentStack<T> pool = new ConcurrentStack<T>();
+        private int current = 0, max = 100, min = 10, batch = 5, increaseBuffer = 5, decreaseBuffer = 10;
+
         /// <summary>The current amount of items in the pool</summary>
         public int Current { get => min; }
         /// <summary>The current amount of items avaiaible in the pool</summary>
@@ -41,20 +39,22 @@ namespace eu.railduction.netcore.dll.ManagedPool
         public int IncreaseBuffer { get => increaseBuffer; set => increaseBuffer = value; }
         /// <summary>If more items are in the pool that the buffer, it will delete/kill the overflowing items</summary>
         public int DecreaseBuffer { get => decreaseBuffer; set => decreaseBuffer = value; }
-        #endregion
 
         /// <summary>
         /// Creates a managed pool<para/>
-        /// Will automatically spawn <paramref name="min"/> items
+        /// Will automatically spawn <paramref name="min"/> items<para/>
+        /// The health-check is run before an item is used for execution
         /// </summary>
         /// <param name="min">The minimum amount of items in the pool</param>
         /// <param name="max">The maximum amount of items in the pool</param>
         /// <param name="batch">Amount if items being spawned at a time if needed</param>
         /// <param name="increaseBuffer">If less items are in the pool than the <paramref name="increaseBuffer"/>, it will spawn <paramref name="batch"/>-amount</param>
         /// <param name="decreaseBuffer">If more items are in the pool than the <paramref name="decreaseBuffer"/>, it will delete/kill the overflowing items</param>
-        /// <param name="creator">Method to handle item-spawning (needs to return the item-type)</param>
+        /// <param name="creator">Method to handle item-spawning</param>
-        /// <param name="destructor">Method to handle item-deleting/killing (needs to take the item-type as parameter)</param>
+        /// <param name="destructor">Method to handle item-deleting/killing</param>
-        public Pool(int min, int max, int batch, int increaseBuffer, int decreaseBuffer, Func<T> creator, Action<T> destructor)
+        /// <param name="healthChecker">Method to handle item-health-checking (useful for unstable items)
+        /// <para/>While running the health-check, the Thread will be blocked!</param>
+        public Pool(int min, int max, int batch, int increaseBuffer, int decreaseBuffer, Func<T> creator, Action<T> destructor = null, Func<T, bool> healthChecker = null)
         {
             this.min = min;
             this.max = max;
@@ -62,36 +62,17 @@ namespace eu.railduction.netcore.dll.ManagedPool
             this.increaseBuffer = increaseBuffer;
             this.decreaseBuffer = decreaseBuffer;
 
+            this.creator = creator;
+            this.destructor = destructor;
+            this.healthChecker = healthChecker;
+
             // Validate objects state
             validate();
 
-            this.creator = creator;
-            this.destructor = destructor;
-
             // Create the minimum amount of objects
             Task.Run(() => createNewObjects(min));
         }
 
-        /// <summary>
-        /// Creates a managed pool<para/>
-        /// Will automatically spawn <paramref name="min"/> items<para/>
-        /// Will check health of items with method <paramref name="healthChecker"/>
-        /// </summary>
-        /// <param name="min">The minimum amount of items in the pool</param>
-        /// <param name="max">The maximum amount of items in the pool</param>
-        /// <param name="batch">Amount if items being spawned at a time if needed</param>
-        /// <param name="increaseBuffer">If less items are in the pool than the <paramref name="increaseBuffer"/>, it will spawn <paramref name="batch"/>-amount</param>
-        /// <param name="decreaseBuffer">If more items are in the pool than the <paramref name="decreaseBuffer"/>, it will delete/kill the overflowing items</param>
-        /// <param name="creator">Method to handle item-spawning (needs to return the item-type)</param>
-        /// <param name="destructor">Method to handle item-deleting/killing (needs to take the item-type as parameter)</param>
-        /// <param name="healthChecker">Method to handle item-health-checking (useful for unstable items)
-        /// <para/>While running the health-check, the Thread will be blocked!</param>
-        public Pool(int min, int max, int batch, int increaseBuffer, int decreaseBuffer, Func<T> creator, Action<T> destructor, Func<T, bool> healthChecker)
-            :this(min, max, batch, increaseBuffer, decreaseBuffer, creator, destructor)
-        {
-            this.healthChecker = healthChecker;
-        }
-
         private void validate()
         {
             if (min <= 0) throw new InvalidOperationException($"Invalid parameter min='{min}'. Must be at least '1'!");
@@ -99,10 +80,15 @@ namespace eu.railduction.netcore.dll.ManagedPool
             if (batch <= 0) throw new InvalidOperationException($"Invalid parameter batch='{batch}'. Must be at least '1'!");
             if (increaseBuffer <= 0) throw new InvalidOperationException($"Invalid parameter increaseBuffer='{increaseBuffer}'. Must be at least '1'!");
             if (decreaseBuffer <= 0) throw new InvalidOperationException($"Invalid parameter decreaseBuffer='{decreaseBuffer}'. Must be at least '1'!");
-            if (batch < decreaseBuffer) throw new InvalidOperationException($"Invalid parameter decreaseBuffer='{decreaseBuffer}'. Must be at least batch='{batch}'!");
+            if(creator == null) throw new InvalidOperationException($"Invalid parameter creator. Cannot be null!");
         }
 
-        private T getItem()
+        /// <summary>
+        /// Will try to get an avaible item out of the pool
+        /// If there is no item avaible, this function will block the thread and retry
+        /// </summary>
+        /// <returns>The item</returns>
+        public T getItem()
         {
             do{
                 T item;
@@ -119,7 +105,11 @@ namespace eu.railduction.netcore.dll.ManagedPool
 
                 if (popped)
                 {
-                    if (healthChecker(item))  // Check for item-health
+                    // Only run healthChecker if its set
+                    bool healthy = true;
+                    if (healthChecker != null) healthy = healthChecker(item);
+
+                    if (healthy)  // Check for item-health
                     {
                         return item;    // Item is healthy, return it
                     }
@@ -142,6 +132,9 @@ namespace eu.railduction.netcore.dll.ManagedPool
             
         }
 
+        // Todo [HIGHER]: Add function to put item back into the pool
+        //                Check if item was created by pool, reject otherwise
+
         private void createNewObjects(int size)
         {
             // create 'size'-amount of items, as long we dont hit our maximum
@@ -201,8 +194,8 @@ namespace eu.railduction.netcore.dll.ManagedPool
         {
             // decrease counter
             current--;
-            // Destruct it
+            // Destruct it when we have a descructor (otherwise the garbage-collector will take care)
-            destructor(item);
+            if(destructor != null) destructor(item);
         }
 
         /// <summary>