Network Resources

<Matrix xmlns="http://schemas.matrix.com/network/2024">
    <Matrix.Resources>
        <!-- Connection string resource -->
        <NetworkResource x:Key="DatabaseConnection"
                        Type="ConnectionString"
                        Scope="Global">
            <NetworkResource.Value>
                Server=db.service;Database=orders;Encrypt=true
            </NetworkResource.Value>
            <NetworkResource.Metadata>
                <ResourceMetadata 
                    Environment="Production"
                    Region="us-west" />
            </NetworkResource.Metadata>
        </NetworkResource>

        <!-- Service configuration resource -->
        <NetworkResource x:Key="ProcessorConfig"
                        Type="Configuration"
                        Scope="Service">
            <NetworkResource.Value>
                <ServiceConfiguration 
                    MaxConcurrency="100"
                    BatchSize="50"
                    RetryCount="3" />
            </NetworkResource.Value>
        </NetworkResource>

        <!-- Shared certificate resource -->
        <NetworkResource x:Key="ServiceCertificate"
                        Type="Certificate"
                        Scope="Zone">
            <NetworkResource.Value>
                <CertificateConfiguration 
                    Path="/certs/service.pfx"
                    Password="{SecureString}" />
            </NetworkResource.Value>
        </NetworkResource>
    </Matrix.Resources>

    <!-- Resource usage in service -->
    <ServiceNode Name="OrderProcessor">
        <ServiceNode.Configuration>
            <ResourceReference Key="ProcessorConfig" />
        </ServiceNode.Configuration>
        <ServiceNode.Security>
            <ResourceReference Key="ServiceCertificate" />
        </ServiceNode.Security>
    </ServiceNode>
</Matrix>

public class NetworkResource : CommunicationElement
{
    public static readonly DependencyProperty ValueProperty =
        DependencyProperty.Register(
            "Value",
            typeof(object),
            typeof(NetworkResource),
            new CommunicationPropertyMetadata(
                null,
                OnResourceValueChanged
            )
        );

    public static readonly DependencyProperty ScopeProperty =
        DependencyProperty.Register(
            "Scope",
            typeof(ResourceScope),
            typeof(NetworkResource)
        );

    public object Value
    {
        get => GetValue(ValueProperty);
        set => SetValue(ValueProperty, value);
    }

    public ResourceScope Scope
    {
        get => (ResourceScope)GetValue(ScopeProperty);
        set => SetValue(ScopeProperty, value);
    }

    public async Task<T> GetValueAsync<T>()
    {
        await EnsureResourceLoadedAsync();
        return (T)Value;
    }

    private async Task EnsureResourceLoadedAsync()
    {
        if (Value == null)
        {
            Value = await LoadResourceValueAsync();
        }
    }
}

public class NetworkResourceProvider : CommunicationElement
{
    private readonly IResourceStore _store;
    private readonly IResourceCache _cache;
    private readonly ConcurrentDictionary<string, NetworkResource> _resources;

    public async Task<T> GetResourceAsync<T>(string key)
    {
        // Check cache first
        if (_cache.TryGetValue(key, out var cached))
            return (T)cached;

        // Load from store
        var resource = await _store.LoadResourceAsync(key);
        _resources.TryAdd(key, resource);

        // Cache the resource
        _cache.Set(key, resource.Value);

        return (T)resource.Value;
    }

    public IObservable<T> ObserveResource<T>(string key)
    {
        return Observable.Create<T>(observer =>
        {
            // Initial value
            var resource = _resources.GetOrAdd(
                key, 
                k => _store.LoadResourceAsync(k).Result
            );
            
            observer.OnNext((T)resource.Value);

            // Subscribe to changes
            var subscription = resource
                .ObserveValue()
                .Select(v => (T)v)
                .Subscribe(observer);

            return subscription;
        });
    }
}

public class ResourceResolver : CommunicationElement
{
    private readonly INetworkResourceProvider _provider;
    private readonly ISecurityProvider _security;

    public async Task<T> ResolveResourceAsync<T>(
        ResourceReference reference)
    {
        // Check access rights
        if (!await _security.CanAccessResourceAsync(reference))
            throw new ResourceAccessDeniedException(reference.Key);

        // Resolve the resource
        var resource = await _provider.GetResourceAsync<T>(reference.Key);

        // Apply any transformations
        return await TransformResourceAsync(resource, reference);
    }

    private async Task<T> TransformResourceAsync<T>(
        T resource, 
        ResourceReference reference)
    {
        foreach (var transformer in reference.Transformers)
        {
            resource = await transformer.TransformAsync(resource);
        }
        return resource;
    }
}