Ruakij/ManagedPool
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Alexander B 2019-02-27 14:00:41 +01:00
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ManagedPool.sln Normal file
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ManagedPool/ManagedPool.csproj Normal file
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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>netcoreapp2.1</TargetFramework>
<SignAssembly>false</SignAssembly>
<RootNamespace>eu.railduction.netcore.dll.ManagedPool</RootNamespace>
<Version>1.1.0</Version>
<PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>
<DelaySign>true</DelaySign>
<AssemblyOriginatorKeyFile>eu.railduction_assembly-key.pfx</AssemblyOriginatorKeyFile>
</PropertyGroup>
</Project>

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ManagedPool/Pool_T_.cs Normal file
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using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
namespace eu.railduction.netcore.dll.ManagedPool
{
public class Pool<T> where T : class
{
private Func<T> creator;
/// <summary>Method to handle item-spawning (needs to return the item-type)</summary>
public Func<T> Creator { get => creator; set => creator = value; }
private Func<T, bool> healthChecker = (T) => { return true; };
/// <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>
public int CurrentAvaiaible { get => pool.Count; }
/// <summary>The minimum amount of items in the pool</summary>
public int Min { get => min; set => min = value; }
/// <summary>The maximum amount of items in the pool</summary>
public int Max { get => max; set => max = value; }
/// <summary>Amount if items being spawned at a time if needed</summary>
public int Batch { get => batch; set => batch = value; }
/// <summary>If less items are in the pool that the buffer, it will spawn 'batch'-amount</summary>
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; }
/// <summary>
/// Creates a managed pool<para/>
/// Will automatically spawn <paramref name="min"/> items
/// </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>
public Pool(int min, int max, int batch, int increaseBuffer, int decreaseBuffer, Func<T> creator, Action<T> destructor)
{
this.min = min;
this.max = max;
this.batch = batch;
this.increaseBuffer = increaseBuffer;
this.decreaseBuffer = decreaseBuffer;
// 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/>
/// 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</param>
/// <param name="destructor">Method to handle item-deleting/killing</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 = min;
this.max = max;
this.batch = batch;
this.increaseBuffer = increaseBuffer;
this.decreaseBuffer = decreaseBuffer;
// Validate objects state
validate();
this.creator = creator;
this.destructor = destructor;
this.healthChecker = healthChecker;
// Create the minimum amount of objects
Task.Run(() => createNewObjects(min));
}
private void validate()
{
if (min <= 0) throw new InvalidOperationException($"Invalid parameter min='{min}'. Must be at least '1'!");
if (max < min) throw new InvalidOperationException($"Invalid parameter max='{max}'. Must be at least min='{min}'!");
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($"Invalid parameter decreaseBuffer='{decreaseBuffer}'. Must be at least '1'!");
}
/// <summary>
/// Will try to get an avaible item out of the pool
/// If there is no item avaible, this function will block the thread and retry
/// </summary>
/// <returns>The item</returns>
public T getItem()
{
do{
T item;
bool popped = pool.TryPop(out item);
if (pool.Count < increaseBuffer) // less than 'buffer'-amount of items avaiaible
{
Task.Run(() => createNewObjects(batch)); // Start generating new ones
}
if (pool.Count > decreaseBuffer) // more than 'buffer'-amount of items avaiaible
{
Task.Run(() => decrease()); // run decease check
}
if (popped)
{
if (healthChecker(item)) // Check for item-health
{
return item; // Item is healthy, return it
}
else
{
Task.Run(() => {
destruct(item); // Item is not healthy, destruct it
createNewObjects(1); // Create new one
});
popped = false;
}
}
// No item or healthCheck failed
Thread.Sleep(1); // Block the current thread for short time
} while (true); // retry infinite
}
private void createNewObjects(int size)
{
// create 'size'-amount of items, as long we dont hit our maximum
for (int i = 0; i < size && current < max; i++)
{
// create new item
T item = create();
// add new item to the pool
pool.Push(item);
}
}
private T create()
{
// Try to run create-method
T item;
try
{
current++;
item = creator();
// Check if create-delegate returned a null-reference
if (item == null)
{
throw new NullReferenceException("Creator-delegate returned 'null'-reference!");
}
else
{
return item;
}
}
catch (Exception ex)
{
current--;
throw new Exception($"Error while creating new '{typeof(T).ToString()}'", ex);
}
}
private void decrease()
{
if (pool.Count > decreaseBuffer + min)
{
for (int i = 0; i < pool.Count - decreaseBuffer - min; i++)
{
T item;
bool popped = pool.TryPop(out item);
if (popped)
{
// Run descructor-method with item
destruct(item);
}
}
}
}
private void destruct(T item)
{
// decrease counter
current--;
// Destruct it
destructor(item);
}
/// <summary>
/// Execute an function-task with an item of the pool<para/>
/// Will get an item out of the pool, run the <paramref name="task"/> and then return it to the pool.
/// </summary>
/// <param name="task">Task to run</param>
public U Exec<U>(Func<T, U> task)
{
T item = getItem(); // Get item from stack
try
{
return task(item); // Run task with item and return result
}
catch (Exception ex)
{
throw new Exception($"Error while executing task with '{typeof(T).ToString()}'", ex);
}
finally
{
pool.Push(item); // Put it back to the stack
Task.Run(() => decrease()); // Run decrease check
}
}
/// <summary>
/// Execute an action-task with an item of the pool<para/>
/// Will get an item out of the pool, run the <paramref name="task"/> and then return it to the pool.
/// </summary>
/// <param name="task">Task to run</param>
public void Exec(Action<T> task)
{
T item = getItem(); // Get item from stack
try
{
task(item); // Run my task with item
}
catch (Exception ex)
{
throw new Exception($"Error while executing task with '{typeof(T).ToString()}'", ex);
}
finally
{
pool.Push(item); // Put it back to the stack
Task.Run(() => decrease()); // Run decrease check
}
}
}
}