异步调用Discuz!NT接口的实现方法

最近在做Discuz!NT论坛与网站整合的东西，于是便用到了Discuz提供的Discuz! Toolkit看了看源码，应该说这是个不错的工具库，提供了关于注册、登录、 文章、积分等论坛操作的一篮子功能，而且配备了对应的Wiki只可惜，Discuz!NT终归是异构的系统，响应速度和突发异常并非如自己的代码一样可控，使用同步方式调用API就显得有那么些不智了
好在Toolkit是开源的，可以DIY，看看它提供的同步访问Web Service方法：

public static byte[] GetResponseBytes(string apiUrl, string method_name, string postData)
{
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(apiUrl);
request.Method = "POST";
request.ContentType = "application/x- -form-urlencoded";
request.ContentLength = postData.Length;
request.Timeout = 20000;
HttpWebResponse response = null;
try
{
StreamWriter swRequestWriter = new StreamWriter(request.GetRequestStream());
swRequestWriter.Write(postData);
if (swRequestWriter != null)
swRequestWriter.Close();
response = (HttpWebResponse)request.GetResponse();
using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
{
return Encoding.UTF8.GetBytes(reader.ReadToEnd());
}
}
finally
{
if (response != null)
response.Close();
}
}

要进行异步的调用，原本的同步流程会被切成两部分：
1、调用开始等待响应
2、响应触发调用完成。
演化成语言：一个方法以委托的方式，在这两部分之间传递，第1部分会将方法指针（委托）塞入请求里，在流程执行到第2部分时，方法被取出回调。
先设计委托原型：

public delegate void GetResponseGeneric<T>(T objects);

异步请求数据结构：

public class RequestState
{
public HttpWebRequest request;
public HttpWebResponse response;
}

扩展一下Util工具类，加上异步调用接口方法：

/// <summary>
/// 异步获取响应开始
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="fun">泛型回调方法</param>
/// <param name="method_name"></param>
/// <param name="parameters"></param>
#region void GetResponseBegin<T>(GetResponseGeneric<T> fun,string method_name, params DiscuzParam[] parameters)
public void GetResponseBegin<T>(GetResponseGeneric<T> fun,string method_name, params DiscuzParam[] parameters)
{
DiscuzParam[] signed = Sign(method_name, parameters);
StringBuilder builder = new StringBuilder();
for (int i = 0; i < signed.Length; i++)
{
if (i > 0)
builder.Append("&");
builder.Append(signed.ToEncodedString());
}
//异步获取字节流
GetResponseBytesBegin<T>(fun,Url, method_name, builder.ToString());
}
#endregion
/// <summary>
/// 异步获取响应完成
/// </summary>
#region void GetReponseEnd<T>(GetResponseGeneric<T> fun,byte[] response_bytes)
public void GetReponseEnd<T>(GetResponseGeneric<T> fun, byte[] response_bytes)
{
XmlSerializer response_serializer = GetSerializer(typeof(T));
try
{
T response = (T)response_serializer.Deserialize(new MemoryStream(response_bytes));
//回调 调用方 接收方法
fun(response);
}
catch
{
Error error = (Error)ErrorSerializer.Deserialize(new MemoryStream(response_bytes));
throw new DiscuzException(error.ErrorCode, error.ErrorMsg);
}
}
#endregion
/// <summary>
/// 异步获取字节流开始
/// </summary>
/// <param name="callback">回调方法</param>
/// <param name="apiUrl"></param>
/// <param name="method_name"></param>
/// <param name="postData"></param>
#region void GetResponseBytesBegin<T>(GetResponseGeneric<T> fun,string apiUrl, string method_name, string postData)
private void GetResponseBytesBegin<T>(GetResponseGeneric<T> fun, string apiUrl, string method_name, string postData)
{
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(apiUrl);
request.Method = "POST";
request.ContentType = "application/x- -form-urlencoded";
request.ContentLength = postData.Length;
request.Timeout = 20000;
StreamWriter swRequestWriter = new StreamWriter(request.GetRequestStream());
swRequestWriter.Write(postData);
if (swRequestWriter != null)
swRequestWriter.Close();
RequestState myRequestState = new RequestState();
myRequestState.request = request;
//异步调用
request.BeginGetResponse(ar => GetResponseBytesEnd<T>(fun, ar), myRequestState);
}
#endregion
/// <summary>
/// 异步获取字节流完成
/// </summary>
/// <param name="asynchronousResult"></param>
#region void GetResponseBytesEnd<T>(GetResponseGeneric<T> fun,IAsyncResult asynchronousResult)
private void GetResponseBytesEnd<T>(GetResponseGeneric<T> fun, IAsyncResult asynchronousResult)
{
RequestState myRequestState = (RequestState)asynchronousResult.AsyncState;
HttpWebRequest myHttpWebRequest = myRequestState.request;
try
{
//接收完成
myRequestState.response = (HttpWebResponse)myHttpWebRequest.EndGetResponse(asynchronousResult);
using (StreamReader reader = new StreamReader(myRequestState.response.GetResponseStream(), Encoding.UTF8))
{
byte[] response_bytes = Encoding.UTF8.GetBytes(reader.ReadToEnd());
//回调 异步获取响应完成 方法
GetReponseEnd<T>(fun, response_bytes);
}
}
catch (WebException ex)
{
DiscuzLogger.WriteLog(typeof(Util), ex);
}
finally
{
if (myRequestState.response != null)
myRequestState.response.Close();
}
}
#endregion
/// <summary>
/// 异步 获取主题列表 开始
/// </summary>
/// <param name="fid"></param>
/// <param name="page_size"></param>
/// <param name="page_index"></param>
/// <returns></returns>
public void GetTopicListBegin(GetResponseGeneric<TopicGetListResponse> fun,
int fid, int page_size, int page_index, string typeIdList)
{
List<DiscuzParam> param_list = new List<DiscuzParam>();
if (session_info != null && !string.IsNullOrEmpty(session_info.SessionKey))
{
param_list.Add(DiscuzParam.Create("session_key", session_info.SessionKey));
}
param_list.Add(DiscuzParam.Create("type_id_list", typeIdList));
param_list.Add(DiscuzParam.Create("fid", fid));
param_list.Add(DiscuzParam.Create("page_size", page_size));
param_list.Add(DiscuzParam.Create("page_index", page_index));
//异步开始
util.GetResponseBegin<TopicGetListResponse>(fun, "topics.getList", param_list.ToArray());
}
调用方使用起来只需要定义好接收方法，剩下就是收数据（CacheObjectCollection.HomepageTopicList是一个缓存项的getter/setter）：
/// <summary>
/// 异步获取论坛指定板块的帖子列表开始
/// </summary>
/// <param name="fid">板块ID</param>
/// <param name="pageSize">数量</param>
/// <param name="pageIndex">索引</param>
/// <param name="typeIdList">主题ID 以 , 为分隔符</param>
#region static void HomepageTopicGetBegin(int fid, int pageSize, int pageIndex, string typeIdList)
public static void HomepageTopicGetBegin(int fid, int pageSize, int pageIndex, string typeIdList)
{
if (CacheObjectConllection.HomepageTopicList == null)
{
try
{
DiscuzSession session = GetSession();
session.GetTopicListBegin(HomepageTopicGetEnd, fid, pageSize, pageIndex, typeIdList);
}
catch (DiscuzException ex)
{
Logger.WriteLog(typeof(DiscuzHelper),
string.Format("DISCUZ!NT异步获取论坛指定板块的帖子列表错误：\r\n{0}"
, ex.ToString()));
}
}
}
#endregion
/// <summary>
/// 异步获取论坛指定板块的帖子列表完成
/// </summary>
#region static void HomepageTopicGetEnd(TopicGetListResponse result)
public static void HomepageTopicGetEnd(TopicGetListResponse result)
{
CacheObjectConllection.HomepageTopicList = result;
}
#endregion

到此，异步调用框架完成，个人感觉很好。

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