SharedResource

.SharedResource() constructs and shares resource for same key. Resource is disposed when all IHandle<Value> are disposed.

// .SharedResource()
IProvider<string, Semaphore> namedSemaphores = Providers.Func<string, Semaphore>(name => new Semaphore(1, 1));
IProvider<string, IHandle<Semaphore>> sharedNamedSemaphores = namedSemaphores.SharedResource();

// Create handles, each has to be disposed.
IHandle<Semaphore> handleX0 = sharedNamedSemaphores["X"];
IHandle<Semaphore> handleX1 = sharedNamedSemaphores["X"];

// Get same shared reference
Semaphore x0 = handleX0.Value;
Semaphore x1 = handleX1.Value;

// Print reference id
Console.WriteLine(RuntimeHelpers.GetHashCode(x0)); // 12345
Console.WriteLine(RuntimeHelpers.GetHashCode(x1)); // 12345

// Dispose handles
handleX0.Dispose();
handleX1.Dispose(); // <- Semaphore is disposed here.

Full Example

Full example

using System;
using System.Runtime.CompilerServices;
using System.Threading;
using Avalanche.Utilities.Provider;

class provider_sharedresource
{
    public static void Run()
    {
        {
            // <01>
            // .SharedResource()
            IProvider<string, Semaphore> namedSemaphores = Providers.Func<string, Semaphore>(name => new Semaphore(1, 1));
            IProvider<string, IHandle<Semaphore>> sharedNamedSemaphores = namedSemaphores.SharedResource();

            // Create handles, each has to be disposed.
            IHandle<Semaphore> handleX0 = sharedNamedSemaphores["X"];
            IHandle<Semaphore> handleX1 = sharedNamedSemaphores["X"];

            // Get same shared reference
            Semaphore x0 = handleX0.Value;
            Semaphore x1 = handleX1.Value;

            // Print reference id
            Console.WriteLine(RuntimeHelpers.GetHashCode(x0)); // 12345
            Console.WriteLine(RuntimeHelpers.GetHashCode(x1)); // 12345

            // Dispose handles
            handleX0.Dispose();
            handleX1.Dispose(); // <- Semaphore is disposed here.
            // </01>
        }
    }
}