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Bound promise to CancellationToken...
Bound promise to CancellationToken Added new states to ExecutionSate enum. Added Safe.Guard() method to handle cleanup of the result of the promise
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ObjectPool.cs
75 lines | 2.7 KiB | text/x-csharp | CSharpLexer
/ Implab / Components / ObjectPool.cs
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 r152 using Implab.Parallels;
using System;
using System.Threading;
namespace Implab.Components {
/// <summary>
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 r154 /// The base class for creating object pools.
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 r152 /// </summary>
/// <remarks>
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 r154 /// <para>The objects pool is offers frequently requested objects to be reused, this gives
/// a gool speed improvement for the 'heavy' objects. To avoid memory overhead the pool uses
/// weak references allowing CG to do it's work. If there are no free objects in the pool
/// they are created on demand. </para>
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 r152 /// <para>
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 r154 /// Implementors need to defined a <see cref="CreateInstance()"/> method
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 r152 /// </para>
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 r154 /// <para>The instances of this class are thred-safe.</para>
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 r152 /// </remarks>
public abstract class ObjectPool<T> where T : class {
readonly AsyncQueue<WeakReference> m_queue = new AsyncQueue<WeakReference>();
readonly int m_size;
int m_count = 0;
protected ObjectPool() : this(Environment.ProcessorCount+1) {
}
protected ObjectPool(int size) {
Safe.ArgumentInRange(size,1,size,"size");
m_size = size;
}
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 r154 /// <summary>
/// Creates the instance if there are no free ones in the pool.
/// </summary>
/// <returns>The new instance.</returns>
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 r152 protected abstract T CreateInstance();
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 r154 /// <summary>
/// Cleanups the instance.
/// </summary>
/// <param name="instance">The instance to cleanup and prepare it for the next use.</param>
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 r152 protected virtual void CleanupInstance(T instance) {
}
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 r154 /// <summary>
/// Allocate free instance from the pool or reates a new one.
/// </summary>
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 r152 public T Allocate() {
WeakReference reference;
while (m_queue.TryDequeue(out reference)) {
Interlocked.Decrement(ref m_count);
object instance = reference.Target;
if (instance == null)
continue;
return (T)instance;
}
return CreateInstance();
}
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 r154 /// <summary>
/// Release the specified instance and returns it to the pool of free instances.
/// </summary>
/// <param name="instance">The instance to return to the pool.</param>
/// <remarks>Before the instance is returned to the pool the <see cref="CleanupInstance(T)"/> is called.</remarks>
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 r152 public void Release(T instance) {
if (m_count < m_size && instance != null) {
Interlocked.Increment(ref m_count);
CleanupInstance(instance);
m_queue.Enqueue(new WeakReference(instance));
}
}
}
}