C# ZLibrary数字资源分发

以下是实现ZLibrary数字资源分发架构核心功能的C#代码示例，包含基础架构组件和关键功能模块：

基础架构组件

csharp 复制代码

public interface IResourceDistributor
{
    Task<Resource> FetchResourceAsync(string resourceId);
    Task<bool> DistributeResourceAsync(Resource resource, Node[] targetNodes);
}

public class Resource
{
    public string Id { get; set; }
    public byte[] Content { get; set; }
    public Metadata Metadata { get; set; }
}

public class Node
{
    public string Id { get; set; }
    public Uri Endpoint { get; set; }
    public int Priority { get; set; }
}

分布式节点管理

csharp 复制代码

public class NodeManager
{
    private readonly ConcurrentDictionary<string, Node> _activeNodes;
    
    public void RegisterNode(Node node)
    {
        _activeNodes.TryAdd(node.Id, node);
    }

    public Node[] GetOptimalNodes(int count)
    {
        return _activeNodes.Values
            .OrderBy(n => n.Priority)
            .Take(count)
            .ToArray();
    }
}

资源分发实现

csharp 复制代码

public class ZLibraryDistributor : IResourceDistributor
{
    private readonly NodeManager _nodeManager;
    private readonly IStorageService _storage;

    public async Task<Resource> FetchResourceAsync(string resourceId)
    {
        var resource = await _storage.RetrieveAsync(resourceId);
        if (resource == null) throw new ResourceNotFoundException(resourceId);
        return resource;
    }

    public async Task<bool> DistributeResourceAsync(Resource resource, Node[] targetNodes)
    {
        var distributionTasks = targetNodes.Select(node => 
            SendToNodeAsync(resource, node));
        
        var results = await Task.WhenAll(distributionTasks);
        return results.All(r => r);
    }

    private async Task<bool> SendToNodeAsync(Resource resource, Node node)
    {
        using var client = new HttpClient();
        var content = new ByteArrayContent(resource.Content);
        var response = await client.PostAsync(node.Endpoint, content);
        return response.IsSuccessStatusCode;
    }
}

负载均衡策略

csharp 复制代码

public class LoadBalancer
{
    public Node SelectNode(IEnumerable<Node> availableNodes)
    {
        var random = new Random();
        var nodes = availableNodes.ToArray();
        return nodes[random.Next(nodes.Length)];
    }
}

该实现包含以下关键技术点：

异步资源获取和分发接口
节点注册与优先级管理
基于HTTP协议的资源传输
随机负载均衡策略
线程安全的节点管理

可根据实际需求扩展以下功能：

增加资源缓存层
实现更复杂的负载均衡算法
添加分布式事务支持
集成内容分发网络(CDN)