/// <summary>
/// Helper method to invoke <see cref="E_ResourcePooling.UseResourceAsync{TResource, T}(AsyncResourcePool{TResource}, Func{TResource, Task{T}}, CancellationToken)"/> with callback which synchronously uses the resource.
/// </summary>
/// <typeparam name="TResource">The type of resources handled by this pool.</typeparam>
/// <param name="pool">This <see cref="AsyncResourcePool{TResource}"/>.</param>
/// <param name="user">The callback which synchronously uses resource.</param>
/// <param name="token">The optional <see cref="CancellationToken"/> to use during resource acquirement.</param>
/// <returns>A task which completes after resource has been returned to the pool.</returns>
/// <exception cref="NullReferenceException">If this <see cref="AsyncResourcePool{TResource}"/> is <c>null</c>.</exception>
public static async Task UseResourceAsync <TResource>(this AsyncResourcePool <TResource> pool, Action <TResource> user, CancellationToken token)
{
await pool.UseResourceAsync(resource =>
{
user(resource);
return(TaskUtils.CompletedTask);
}, token);
}
/// <summary>
/// Helper method to invoke <see cref="E_ResourcePooling.UseResourceAsync{TResource, T}(AsyncResourcePool{TResource}, Func{TResource, Task{T}}, CancellationToken)"/> with callback which asynchronously returns value of type <typeparamref name="T"/>.
/// </summary>
/// <typeparam name="TResource">The type of resources handled by this pool.</typeparam>
/// <typeparam name="T">The type of return value of asynchronous callback.</typeparam>
/// <param name="pool">This <see cref="AsyncResourcePool{TResource}"/>.</param>
/// <param name="user">The callback which asynchronously returns some value of type <typeparamref name="T"/>.</param>
/// <param name="token">The optional <see cref="CancellationToken"/> to use during asynchronous operations inside <paramref name="user"/> callback.</param>
/// <returns>A task which returns the result of <paramref name="user"/> on its completion.</returns>
/// <exception cref="NullReferenceException">If this <see cref="AsyncResourcePool{TResource}"/> is <c>null</c>.</exception>
public static async Task <T> UseResourceAsync <TResource, T>(this AsyncResourcePool <TResource> pool, Func <TResource, Task <T> > user, CancellationToken token)
{
var retVal = default(T);
await pool.UseResourceAsync(async resource =>
{
retVal = await user(resource);
}, token);
return(retVal);
}
