Android Question Parallel HttpJob requests

GaNdAlF89

Active Member
Licensed User
Hi, I have this class:

HttpTask:
Sub Class_Globals
   
    Dim ModuleCallback As Object
    Dim SocketEvent As String
   
    Dim HJRequest As HttpJob
   
End Sub

Public Sub Initialize (mCallback As Object, sEvent As String)
   
    ModuleCallback = mCallback
    SocketEvent = sEvent
   
    HJRequest.Initialize("",Me)
   
End Sub

Public Sub ExecuteRemoteQuery (RemoteQuery As String, TaskId As Int)
   
    Dim RemoteQueryStr As String = "cmd=" & RemoteQuery & "&version=" & Starter.VersionNumber
   
    HJRequest.PostBytes(Starter.ServerAddress & "/" & Starter.RemoteQueryScript,RemoteQueryStr.GetBytes("UTF8"))
    HJRequest.GetRequest.Timeout = Starter.TimeoutOffline

    Wait For (HJRequest) JobDone (HJResponse As HttpJob)
   
    Dim Success As Boolean = HJResponse.Success
    If (Success = True) Then
       
        Dim ResponseData As String = HJResponse.GetString2("UTF8")
       
        CallSubDelayed3(ModuleCallback,SocketEvent & "_ResponseSuccess",ResponseData,TaskId)
       
    Else
       
        Dim Response As OkHttpResponse = HJResponse.Response
       
        CallSubDelayed3(ModuleCallback,SocketEvent & "_ResponseError",Response,TaskId)
       
        Response.Release
       
    End If
   
    HJResponse.Release
    HJRequest.Release
   
End Sub

Everything works perfectly. But if there are many parallel request, like:

Activity sub:
Sub GetDataFromServer

    If (Condition1) Then

        Dim HT As HttpTask
        HT.Initialize(Me,"CRSocket")
        HT.ExecuteRemoteQuery("...params...",48)

    End If

    If (Condition2) Then

        Dim HT As HttpTask
        HT.Initialize(Me,"MBSocket")
        HT.ExecuteRemoteQuery("...params...",50)

    End If

    If (Condition3) Then

        Dim HT As HttpTask
        HT.Initialize(Me,"TPSocket")
        HT.ExecuteRemoteQuery("...params...",54)

    End If

End Sub

I obtain this error:
B4X:
ResponseError - Reason: java.net.SocketTimeoutException

How can I solve this, avoiding making requests one after the other? Thanks
 
Last edited:

DonManfred

Expert
Licensed User
How can I solve this, avoiding making requests one after the other?
 
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GaNdAlF89

Active Member
Licensed User
Thank for reply.
I know, but my question is:
why can't I send multiple httpjob requests at the same time (with different objects, obviously), and I have to wait the completion of a request to execute the next? (as was the case with old HttpRequest)
 
Last edited:
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GaNdAlF89

Active Member
Licensed User
Once you understand how to work with Wait For, you will see that this class only makes things more complicated. Correcting the bugs in this code will not help in any way.
I made this class as a requests handler to aggregate them in all activities, in order to avoid writing almost the same code in all places.
Since the code in this class is almost identical to what I should write in all places (apart from the initialization), I would like to understand the reason why it is more complicated, and where bugs are inside it. Thank you for all :)
 
Last edited:
Upvote 0

HAH

Well-Known Member
Licensed User
I think the problem is in httpjob referencing, you should try using object array, so all your requests will work in parallel.
Try like this "Not tested"
B4X:
Sub Globals
   
    Dim HJRequest() As HttpJob
   
End Sub

'Each request has unique httpjob object, note TaskId also should be unique
Public Sub ParallelRequest (RemoteQuery As String, TaskId As Int)
    Dim RemoteQueryStr As String = "cmd=" & RemoteQuery & "&version=" & Starter.VersionNumber
    HJRequest(TaskId).Initialize("",Me)
    HJRequest(TaskId).PostBytes("url",RemoteQueryStr.GetBytes("UTF8"))
    Wait For (HJRequest(TaskId)) JobDone (HJResponse As HttpJob)
    Dim Success As Boolean = HJResponse.Success
    If Success Then
        Dim ResponseData As String = HJResponse.GetString2("UTF8")
        'do what you want ...
    End If
    HJResponse.Release
    HJRequest(TaskId).Release  
End Sub
 
Upvote 1

GaNdAlF89

Active Member
Licensed User
I think the problem is in httpjob referencing, you should try using object array, so all your requests will work in parallel.
Try like this "Not tested"
B4X:
Sub Globals
  
    Dim HJRequest() As HttpJob
  
End Sub

'Each request has unique httpjob object, note TaskId also should be unique
Public Sub ParallelRequest (RemoteQuery As String, TaskId As Int)
    Dim RemoteQueryStr As String = "cmd=" & RemoteQuery & "&version=" & Starter.VersionNumber
    HJRequest(TaskId).Initialize("",Me)
    HJRequest(TaskId).PostBytes("url",RemoteQueryStr.GetBytes("UTF8"))
    Wait For (HJRequest(TaskId)) JobDone (HJResponse As HttpJob)
    Dim Success As Boolean = HJResponse.Success
    If Success Then
        Dim ResponseData As String = HJResponse.GetString2("UTF8")
        'do what you want ...
    End If
    HJResponse.Release
    HJRequest(TaskId).Release 
End Sub
Thank you! I will try...
 
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