namespace NewLife.Configuration;
/// <summary>复合配置提供者。常用于本地配置与网络配置的混合</summary>
public class CompositeConfigProvider : IConfigProvider
{
#region 属性
/// <summary>日志提供者集合</summary>
/// <remarks>为了线程安全，使用数组</remarks>
public IConfigProvider[] Configs { get; set; } = new IConfigProvider[0];
/// <summary>名称</summary>
public String Name { get; set; }
/// <summary>根元素</summary>
public IConfigSection Root { get => Configs[0].Root; set => throw new NotImplementedException(); }
/// <summary>所有键</summary>
public ICollection<String> Keys
{
get
{
var ks = new List<String>();
foreach (var cfg in Configs)
{
if (cfg.Keys != null)
{
foreach (var item in cfg.Keys)
{
if (!ks.Contains(item)) ks.Add(item);
}
}
}
return ks;
}
}
/// <summary>是否新的配置文件</summary>
public Boolean IsNew { get => Configs[0].IsNew; set => Configs[0].IsNew = value; }
/// <summary>返回获取配置的委托</summary>
public GetConfigCallback GetConfig => key => GetSection(key)?.Value;
#endregion
#region 构造
/// <summary>实例化</summary>
public CompositeConfigProvider() => Name = GetType().Name.TrimEnd("ConfigProvider");
/// <summary>实例化</summary>
/// <param name="configProvider1"></param>
/// <param name="configProvider2"></param>
public CompositeConfigProvider(IConfigProvider configProvider1, IConfigProvider configProvider2) : this() => Configs = new IConfigProvider[] { configProvider1, configProvider2 };
/// <summary>添加</summary>
/// <param name="configProviders"></param>
public void Add(params IConfigProvider[] configProviders)
{
var list = new List<IConfigProvider>(Configs);
list.AddRange(configProviders);
Configs = list.ToArray();
}
#endregion
#region 取值
/// <summary>获取 或 设置 配置值</summary>
/// <param name="key">键</param>
/// <returns></returns>
public String this[String key]
{
get
{
foreach (var cfg in Configs)
{
var value = cfg[key];
if (value != null) return value;
}
return null;
}
set
{
foreach (var cfg in Configs)
{
//cfg[key] = value;
var section = cfg.GetSection(key);
if (section != null) section.Value = value;
}
}
}
/// <summary>查找配置项。可得到子级和配置</summary>
/// <param name="key">配置名</param>
/// <returns></returns>
public IConfigSection GetSection(String key)
{
foreach (var cfg in Configs)
{
var section = cfg.GetSection(key);
if (section != null) return section;
}
return null;
}
#endregion
#region 方法
/// <summary>从数据源加载数据到配置树</summary>
public Boolean LoadAll()
{
var rs = false;
foreach (var cfg in Configs)
{
rs |= cfg.LoadAll();
}
return rs;
}
/// <summary>保存配置树到数据源</summary>
public Boolean SaveAll()
{
var rs = false;
foreach (var cfg in Configs)
{
rs |= cfg.SaveAll();
}
return rs;
}
/// <summary>加载配置到模型</summary>
/// <typeparam name="T">模型。可通过实现IConfigMapping接口来自定义映射配置到模型实例</typeparam>
/// <param name="path">路径。配置树位置，配置中心等多对象混合使用时</param>
/// <returns></returns>
public T Load<T>(String path = null) where T : new()
{
foreach (var cfg in Configs)
{
var model = cfg.Load<T>(path);
if (model != null) return model;
}
return default;
}
/// <summary>保存模型实例</summary>
/// <typeparam name="T">模型</typeparam>
/// <param name="model">模型实例</param>
/// <param name="path">路径。配置树位置</param>
public Boolean Save<T>(T model, String path = null)
{
foreach (var cfg in Configs)
{
var rs = cfg.Save(model, path);
if (rs) return true;
}
return false;
}
#endregion
#region 绑定
private readonly IDictionary<Object, String> _models = new Dictionary<Object, String>();
private readonly IDictionary<Object, ModelWrap> _models2 = new Dictionary<Object, ModelWrap>();
/// <summary>绑定模型，使能热更新，配置存储数据改变时同步修改模型属性</summary>
/// <typeparam name="T">模型。可通过实现IConfigMapping接口来自定义映射配置到模型实例</typeparam>
/// <param name="model">模型实例</param>
/// <param name="autoReload">是否自动更新。默认true</param>
/// <param name="path">命名空间。配置树位置，配置中心等多对象混合使用时</param>
public virtual void Bind<T>(T model, Boolean autoReload = true, String path = null)
{
// 如果有命名空间则使用指定层级数据源
var source = GetSection(path);
if (source != null)
{
if (model is IConfigMapping map)
map.MapConfig(this, source);
else
source.MapTo(model, this);
}
if (autoReload && !_models.ContainsKey(model))
{
_models.Add(model, path);
}
AddChanged();
}
/// <summary>绑定模型，使能热更新，配置存储数据改变时同步修改模型属性</summary>
/// <typeparam name="T">模型。可通过实现IConfigMapping接口来自定义映射配置到模型实例</typeparam>
/// <param name="model">模型实例</param>
/// <param name="path">命名空间。配置树位置，配置中心等多对象混合使用时</param>
/// <param name="onChange">配置改变时执行的委托</param>
public virtual void Bind<T>(T model, String path, Action<IConfigSection> onChange)
{
// 如果有命名空间则使用指定层级数据源
var source = GetSection(path);
if (source != null)
{
if (model is IConfigMapping map)
map.MapConfig(this, source);
else
source.MapTo(model, this);
}
if (onChange != null && !_models2.ContainsKey(model))
{
_models2.Add(model, new ModelWrap { Path = path, OnChange = onChange });
}
AddChanged();
}
private class ModelWrap
{
public String Path { get; set; }
public Action<IConfigSection> OnChange { get; set; }
}
/// <summary>通知绑定对象，配置数据有改变</summary>
protected virtual void NotifyChange()
{
foreach (var item in _models)
{
var model = item.Key;
var source = GetSection(item.Value);
if (source != null)
{
if (model is IConfigMapping map)
map.MapConfig(this, source);
else
source.MapTo(model, this);
}
}
foreach (var item in _models2)
{
var model = item.Key;
var source = GetSection(item.Value.Path);
if (source != null) item.Value.OnChange(source);
}
// 通过事件通知外部
_Changed?.Invoke(this, EventArgs.Empty);
}
#endregion
#region 配置变化
private Int32 _count;
private event EventHandler _Changed;
/// <summary>配置改变事件。执行了某些动作，可能导致配置数据发生改变时触发</summary>
public event EventHandler Changed
{
add
{
_Changed += value;
// 首次注册事件时，向内部提供者注册事件
AddChanged();
}
remove
{
// 最后一次取消注册时，向内部提供者取消注册
if (Interlocked.Decrement(ref _count) == 0)
{
foreach (var cfg in Configs)
{
cfg.Changed -= OnChange;
}
}
_Changed -= value;
}
}
private void AddChanged()
{
if (Interlocked.Increment(ref _count) == 1)
{
foreach (var cfg in Configs)
{
cfg.Changed += OnChange;
}
}
}
private void OnChange(Object sender, EventArgs e) => NotifyChange();
#endregion
}
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