/// <summary>
/// 执行，按实际结果返回
/// </summary>
/// <param name="letter">客户端递交的参数信息</param>
/// <returns></returns>
public static object Exec(Letter letter)
{
//1.创建对象,即$api.get("account/single")中的account
IViewAPI execObj = ExecuteMethod.CreateInstance(letter);
//2.获取要执行的方法，即$api.get("account/single")中的single
MethodInfo method = getMethod(execObj.GetType(), letter);
//清除缓存
if (letter.HTTP_METHOD.Equals("put", StringComparison.CurrentCultureIgnoreCase))
{
CacheAttribute.Remove(method, letter);
}
//3#.验证方法的特性,一是验证Http动词，二是验证是否登录后操作，三是验证权限
//----验证Http谓词访问限制
HttpAttribute.Verify(letter.HTTP_METHOD, method);
//LoginAttribute.Verify(method);
//----范围控制，本机或局域网，或同域
bool isRange = RangeAttribute.Verify(method, letter);
//----验证是否需要登录
LoginAttribute loginattr = LoginAttribute.Verify(method, letter);
//----清理参数值中的html标签,默认全部清理，通过设置not参数不过虑某参数
HtmlClearAttribute.Clear(method, letter);
//4.构建执行该方法所需要的参数
object[] parameters = getInvokeParam(method, letter);
//5.执行方法，返回结果
object objResult = null; //结果
//只有get方式时，才使用缓存
CacheAttribute cache = null;
//if (letter.HTTP_METHOD.Equals("put", StringComparison.CurrentCultureIgnoreCase))
// CacheAttribute.Remove(method, letter);
if (letter.HTTP_METHOD.Equals("get", StringComparison.CurrentCultureIgnoreCase))
{
cache = CacheAttribute.GetAttr <CacheAttribute>(method);
}
if (cache != null)
{
objResult = CacheAttribute.GetResult(method, letter);
if (objResult == null)
{
objResult = method.Invoke(execObj, parameters);
CacheAttribute.Insert(cache.Expires, method, letter, objResult);
}
}
else
{
objResult = method.Invoke(execObj, parameters);
}
//将执行结果写入日志
LoginAttribute.LogWrite(loginattr, objResult);
return(objResult);
}
/// <summary>
/// 创建对象，如果存在，则直接返回；如果不存在，创建后返回
/// </summary>
/// <param name="letter"></param>
/// <returns></returns>
public static IViewAPI CreateInstance(Letter letter)
{
string assemblyName = "Song.ViewData";
string classFullName = String.Format("{0}.Methods.{1}", assemblyName, letter.ClassName);
IViewAPI obj = null;
//由缓存中查找，是否存在
ExecuteMethod curr = ExecuteMethod.GetInstance();
foreach (KeyValuePair <string, object> kv in curr._objects)
{
if (classFullName.Trim().Equals(kv.Key, StringComparison.CurrentCultureIgnoreCase))
{
obj = (IViewAPI)kv.Value;
break;
}
}
if (obj != null)
{
return(obj);
}
//如果之前未创建，则重新创建
Type type = null;
Assembly assembly = Assembly.Load(assemblyName);
Type[] types = assembly.GetExportedTypes()
.Where(t => t.GetInterfaces().Contains(typeof(IViewAPI)))
.ToArray();
foreach (Type info in types)
{
if (info.FullName.Equals(classFullName, StringComparison.CurrentCultureIgnoreCase))
{
type = info;
break;
}
}
if (type == null)
{
throw new Exception(
string.Format("调用的接口'{0}'不存在, 可能是'{1}'拼写错误",
letter.API_PATH, letter.ClassName));
}
obj = (IViewAPI)System.Activator.CreateInstance(type); //创建对象
//记录到缓存
if (!ExecuteMethod.GetInstance()._objects.ContainsKey(type.FullName))
{
ExecuteMethod.GetInstance()._objects.Add(type.FullName, obj);
}
return(obj);
}
