C# 如何在执行公共任务时等待多个线程?
我有多个线程并行执行API调用。每当jwt令牌过期时,我希望所有线程等待,直到调用刷新令牌API并返回有效的更新jwt令牌。我有一个singleton类,它有一个刷新令牌方法,该方法将进行调用并更新令牌。我如何确保所有其他线程都将等待令牌获取完成C# 如何在执行公共任务时等待多个线程?,c#,multithreading,asynchronous,async-await,thread-synchronization,C#,Multithreading,Asynchronous,Async Await,Thread Synchronization,我有多个线程并行执行API调用。每当jwt令牌过期时,我希望所有线程等待,直到调用刷新令牌API并返回有效的更新jwt令牌。我有一个singleton类,它有一个刷新令牌方法,该方法将进行调用并更新令牌。我如何确保所有其他线程都将等待令牌获取完成 public class JWTTokenManager { private static JWTTokenManager _tokenManager; private string _token;
public class JWTTokenManager
{
private static JWTTokenManager _tokenManager;
private string _token;
private bool _refreshingToken;
public static JWTTokenManager GetManager()
{
if (_tokenManager == null)
_tokenManager = new JWTTokenManager();
return _tokenManager;
}
public void UpdateToken(string token)
{
_token = token;
}
public string GetToken()
{
return _token;
}
public async Task<bool> ValidateRefreshTocken()
{
UserInfo userdata = JsonConvert.DeserializeObject<UserInfo>(GetUserInfo(_token), new Helper.DefaultJsonSetting());
if (!string.IsNullOrWhiteSpace(userdata.Exp) && TokenExpired(long.Parse(userdata.Exp)))
{
_refreshingToken = true;
JWTToken jwtToken = Database.DBService.GetDB().FetchJWTToken();
RefreshToken requestRefresh = new RefreshToken
{
ExpiredTocken = jwtToken.Token,
RefreshTocken = jwtToken.RefreshToken
};
HttpClient httpClient = CloudService.GetCloudService().GetHttpClient();
HttpResponseMessage response = await httpClient.PostAsync($"account/v1/tokenRefresh", new StringContent(JsonConvert.SerializeObject(requestRefresh), Encoding.UTF8, "application/json"));
bool responseStatus = await ParseTokenResponseAsync(response);
_refreshingToken = false;
return responseStatus;
}
else
{
return true;
}
}
private string GetUserInfo(string key)
{
string[] base64Url = key.Split('.');
if (base64Url.Length > 1)
{
string userinfo = base64Url[1];
userinfo = userinfo.Replace(" ", "+");
int mod4 = userinfo.Length % 4;
if (mod4 > 0)
{
userinfo += new string('=', 4 - mod4);
}
var base64EncodedBytes = System.Convert.FromBase64String(userinfo);
return Encoding.UTF8.GetString(base64EncodedBytes);
}
else
{
return "";
}
}
public bool TokenExpired(long unixTimeStamp)
{
DateTime tokenExpiryDateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
tokenExpiryDateTime = tokenExpiryDateTime.AddSeconds(unixTimeStamp).ToLocalTime();
DateTime currentDateTime = DateTime.Now;
return DateTime.Compare(tokenExpiryDateTime, currentDateTime) <= 0;
}
public async Task<bool> ParseTokenResponseAsync(HttpResponseMessage httpResponse)
{
if (httpResponse.IsSuccessStatusCode == true)
{
string responseString = await httpResponse.Content.ReadAsStringAsync();
Newtonsoft.Json.Linq.JObject responsedataObject = Newtonsoft.Json.Linq.JObject.Parse(responseString);
string token = responsedataObject["data"]["token"].ToString();
string refreshToken = responsedataObject["data"]["refreshToken"].ToString();
_token = token;
JWTToken updatedToken = new JWTToken()
{
Token = _token,
RefreshToken = refreshToken
};
Database.DBService.GetDB().InsertOrUpdateJWTToken(updatedToken);
return true;
}
else
{
return false;
}
}
}
public class CloudService
{
private const int TIME_OUT = 50;
private const int HTTP_GET = 0;
private const int HTTP_PUT = 1;
private const int HTTP_POST = 2;
private const int HTTP_DELETE = 3;
private static CloudService _serviceInstance;
public static CloudService GetCloudService()
{
if (_serviceInstance == null)
_serviceInstance = new CloudService();
return _serviceInstance;
}
private async Task<HttpResponseMessage> ExecuteHttpTask(int taskType, string url, StringContent content = null)
{
HttpClient httpClient = GetHttpClient();
switch (taskType)
{
case HTTP_GET:
return await httpClient.GetAsync(url);
case HTTP_PUT:
return await httpClient.PutAsync(url, content);
case HTTP_POST:
return await httpClient.PostAsync(url, content);
case HTTP_DELETE:
return await httpClient.DeleteAsync(url);
default:
return null;
}
}
public async Task<Response> HTTPTask(string url, int taskType, StringContent content = null, bool login = false)
{
bool refreshTocken = await JWTTokenManager.GetManager().ValidateRefreshTocken();
Response httpResponse = new Response();
try
{
HttpResponseMessage response = await ExecuteHttpTask(taskType, url, content);
string responseString = await response.Content.ReadAsStringAsync();
if (!response.IsSuccessStatusCode)
httpResponse.status = "error";
else
httpResponse.status = "data";
httpResponse.data = ParseResponseData(httpResponse.status, responseString);
}
catch (Exception e)
{
httpResponse = GenericErrorResponse(e.Message);
}
return httpResponse;
}
public async Task<Response> GetSectionAsync(string id)
{
string url = $"catalog/v2/homepageSections/{id}?order-by=name,asc";
return await HTTPTask(url, Constants.HTTP_GET);
}
public async Task<Response> GetProductAsync(string id)
{
string url = $"catalog/v2/products/{id}";
return await HTTPTask(url, Constants.HTTP_GET);
}
public async Task<Response> GetCourseDetailsAsync(string id)
{
string url = $"catalog/v2/products/{id}/courseDetails";
return await HTTPTask(url, Constants.HTTP_GET);
}
}
公共类JWTTokenManager
{
私有静态JWTTokenManager\u tokenManager;
私有字符串\u令牌;
私立学校进修课程;
公共静态JWTTokenManager GetManager()
{
if(_tokenManager==null)
_tokenManager=新的JWTTokenManager();
返回"标记管理器;;
}
公共void UpdateToken(字符串标记)
{
_令牌=令牌;
}
公共字符串GetToken()
{
返回令牌;
}
公共异步任务ValidateRefreshTocken()
{
UserInfo userdata=JsonConvert.DeserializeObject(GetUserInfo(_标记),new Helper.DefaultJsonSetting());
如果(!string.IsNullOrWhiteSpace(userdata.Exp)&&TokenExpired(long.Parse(userdata.Exp)))
{
_refreshingToken=true;
JWTToken JWTToken=Database.DBService.GetDB().FetchJWTToken();
RefreshToken requestRefresh=新的RefreshToken
{
expiredToken=jwtToken.Token,
RefreshTocken=jwtToken.RefreshToken
};
HttpClient HttpClient=CloudService.GetCloudService().GetHttpClient();
HttpResponseMessage response=等待httpClient.PostAsync($“account/v1/tokenRefresh”,新的StringContent(JsonConvert.SerializeObject(requestRefresh),Encoding.UTF8,“application/json”);
bool responseStatus=wait-ParseTokenResponseAsync(响应);
_refreshingToken=false;
返回响应状态;
}
其他的
{
返回true;
}
}
私有字符串GetUserInfo(字符串键)
{
字符串[]base64Url=key.Split('.');
如果(base64Url.Length>1)
{
字符串userinfo=base64Url[1];
userinfo=userinfo.Replace(“,“+”);
int mod4=userinfo.Length%4;
如果(mod4>0)
{
userinfo+=新字符串('=',4-mod4);
}
var base64EncodedBytes=System.Convert.FromBase64String(userinfo);
返回Encoding.UTF8.GetString(base64EncodedBytes);
}
其他的
{
返回“”;
}
}
公共bool令牌过期(长unixTimeStamp)
{
DateTime令牌ExpireyDateTime=新的日期时间(1970,1,1,0,0,0,0,DateTimeKind.Utc);
tokenExpiryDateTime=tokenExpiryDateTime.AddSeconds(unixTimeStamp.ToLocalTime();
DateTime currentDateTime=DateTime.Now;
返回日期时间。比较(tokenExpiryDateTime、currentDateTime)1)
{
字符串userinfo=base64Url[1];
userinfo=userinfo.Replace(“,“+”);
int mod4=userinfo.Length%4;
如果(mod4>0)
{
userinfo+=新字符串('=',4-mod4);
}
var base64EncodedBytes=System.Convert.FromBase64String(userinfo);
返回Encoding.UTF8.GetString(base64EncodedBytes);
}
其他的
{
返回“”;
}
}
公共bool令牌过期(长unixTimeStamp)
{
DateTime令牌ExpireyDateTime=新的日期时间(1970,1,1,0,0,0,0,DateTimeKind.Utc);
tokenExpiryDateTime=tokenExpiryDateTime.AddSeconds(unixTimeStamp.ToLocalTime();
DateTime currentDateTime=DateTime.Now;
return DateTime.Compare(tokenexpireydatetime,currentDateTime)您可以使用a。假设您有三个线程a、B(并行调用api调用)和C(执行令牌刷新)
您应该让JWTTokenManager
返回一个令牌,而不是它需要一个令牌
如果令牌有效,它将返回带有有效令牌的已完成任务,如果无效,它将返回在检索令牌时将完成的任务。同一任务可由多个并发线程等待
public class JWTTokenManager
{
private Task<string> tokenTask;
private readonly object sync = new object();
public Task<string> GetTokenAsync()
{
lock (sync)
{
if (tokenTask.IsCompleted && !IsTokenValid(tokenTask.Result))
{
tokenTask = GetNewTokenAsync();
}
return tokenTask;
}
}
}
公共类JWTTokenManager
{
私有任务标记任务;
私有只读对象同步=新对象();
公共任务GetTokenAsync()
{
锁定(同步)
{
if(tokenTask.IsCompleted&!IsTokenValid(tokenTask.Result))
{
tokenTask=GetNewTokenAsync();
}
返回任务;
}
}
}
无锁版本:
public class JWTTokenManager
{
private Task<string> tokenTask;
private readonly object sync = new object();
public Task<string> GetTokenAsync()
{
var currentTokenTask = Volatile.Read(ref tokenTask);
if (currentTokenTask .IsCompleted && !IsTokenValid(currentTokenTask .Result))
{
currentTokenTask = GetNewTokenAsync();
Volatile.Write(ref tokenTask, currentTokenTask);
}
return currentTokenTask ;
}
}
公共类JWTTokenManager
{
私有任务标记任务;
私有只读对象同步=新对象();
公共任务GetTokenAsync()
{
var currentTokenTask=Volatile.Read(ref-tokenTask);
if(currentTokenTask.IsCompleted&!IsTokenValid(currentTokenTask.Result))
{
currentTokenTask=GetNewTokenAsync();
Volatile.Write(ref-tokenTask,currentTokenTask);
}
返回当前任务;
}
}
Look for wait all Unrelated:你的Singleton实现不是线程安全的。你确定没有任何问题吗?@Fildor请你详细说明一下。理论上,JWTTokenManager可能不止一个实例。这可能会导致问题。特别是当你试图同步你的thr时eads。很可能您忽略了隐式线程竞赛错误。您无法确保令牌不会在线程竞赛失败时过期
public class JWTTokenManager
{
private Task<string> tokenTask;
private readonly object sync = new object();
public Task<string> GetTokenAsync()
{
lock (sync)
{
if (tokenTask.IsCompleted && !IsTokenValid(tokenTask.Result))
{
tokenTask = GetNewTokenAsync();
}
return tokenTask;
}
}
}
public class JWTTokenManager
{
private Task<string> tokenTask;
private readonly object sync = new object();
public Task<string> GetTokenAsync()
{
var currentTokenTask = Volatile.Read(ref tokenTask);
if (currentTokenTask .IsCompleted && !IsTokenValid(currentTokenTask .Result))
{
currentTokenTask = GetNewTokenAsync();
Volatile.Write(ref tokenTask, currentTokenTask);
}
return currentTokenTask ;
}
}