scopedec

[bitfaster]

Provide an explicit ScopedCache to ease working with scoped IDisposable values. All read operations are prefixed with 'Scoped' and return lifetimes instead of values. Scoped methods implement logic to ensure the lifetime returned is always valid.

public class Foo
{
    private const int capacity = 666;
    private ScopedCache<int, SomeDisposable> lru = new(new ConcurrentLru<int, Scoped<SomeDisposable>>(capacity));

    public void Bar()
    {
        var valueFactory = new SomeDisposableValueFactory();

        using (var lifetime = lru.ScopedGetOrAdd(1, k => valueFactory.Create(k)))
        {
            // lifetime.Value is guaranteed to be alive until the lifetime is disposed
        }
    }
}

public class SomeDisposableValueFactory
{
    public Scoped<SomeDisposable> Create(int key)
    {
        return new Scoped<SomeDisposable>(new SomeDisposable(key));
    }
}