Android Question Error HttpJob

[consultatech4android]

Good morning everyone.

I am developing an application which basically is a reservations manager and queue for bars and restaurants.
Using a tablet attendant accesses this application and making the booking for each client, providing the name, mobile and receive SMS or not. After confirming the reservation, the client is placed in a queue in the same order of booking, and this will receive two SMS one confirming their position in the queue and the other with instructions commands (if authorized sending SMS on reservation).
The database is on a PC with MS SQL Server, and communication with the tablet PC is via Webservice. Both Queue Reservations as Queue are created in an array object in memory on the tablet, and are updated every 60 seconds via the thread that calls the respective methods of the webservice.
Segunte error is occurring upon confirmation of booking:

An error occurred in sub: httpjoj_getstring2 (B4A line: 108)
tr.Initialize2 (File.OpenInput (HttpUtils2Service.TempFolder, taskId), Encoding)
java.io.FileNotFoundException: / data/data/br.com.consultatech.smartline/cache/99: open failed: ENOENT (No such file or directory)

This error occurs in HttpJob, I use to call the methods of the webservice, which in this case could be a sequence of calls (the end of a method can call another). The booking confirmation is a method that transfers customers queue booking for the queue, and soon after termination methods are called to update the arrays of rows


Booking Confirmation Method

Sub Confirma_Reserva_WS
    Dim reqConfirmar_Reserva As HttpRequest
    Dim Endereco, Pr As String
    Dim Para() As Byte
    Dim Connect As Boolean
    Dim Inp As InputStream
    Dim conv As ByteConverter

    'Checagem da versão do ANDROID (Cria objeto Versao e carrega a string da versão do sistema)
    Dim Versao As ApplicationWS '
    Versao.Initialize
    Versao.setVersionString(OS.Release)

    Pr = ""

    Connect = True

    If Versao.getVersionString_Number() < "3" Then    ' Versão do ANDROID menor que 3.0 utiliza a lib HTTP ( classes HttpClient e HttpRequest )
                                                    ' para requisições ao WEB Service
        Endereco = parametro.getWeb_Service & "/ConfirmarReserva"
        HttpConfirmarReserva.Initialize("HttpConfirmarReserva")
        reqConfirmar_Reserva.initializeget(Endereco)
        reqConfirmar_Reserva.Timeout = nTimeOut
        If HttpConfirmarReserva.Execute(reqConfirmar_Reserva, 0) = False Then
            Connect = False
        End If
    Else                                            ' Versão do ANDROID maior ou igual que 3.0 utiliza a classe HttpJob
                                                    ' para requisições ao WEB Service
        Endereco = parametro.getWeb_Service & "/ConfirmarReserva"
        HJConfirmarReserva.Initialize("ConfirmarReserva",Me)
        HJConfirmarReserva.PostString(Endereco,Pr)
        'Connect = HJConfirmarReserva.Success
    End If

    If Connect = False Then Return False

    Return True

End Sub

'#########################################################################################################
'# HttpConfirmarReserva                                                                                  #
'#########################################################################################################
Sub HttpConfirmarReserva_ResponseSuccess (Response As HttpResponse, TaskId As Int)

    lConfirma_Reserva = True
    Atualizar_Posicao_Fila_Espera_WS

End Sub

Sub HttpConfirmarReserva_ResponseError (Reason As String, StatusCode As Int, TaskId As Int)
    Dim msg As String
    ProgressDialogHide

    lConfirma_Reserva = False

    msg = "Erro ao conectar no Web Service." & CRLF & "Confirmar a Reserva"

    If Reason <> Null Then
        msg = msg & CRLF & "(" & StatusCode & ") " & Reason
    End If
    ToastMessageShow(msg, True)
End Sub

Reload position in the queue

Sub Atualizar_Posicao_Fila_Espera_WS
    Dim reqAtualizar_Posicao As HttpRequest
    Dim Endereco, Pr As String
    Dim Para() As Byte
    Dim Connect As Boolean
    Dim Inp As InputStream
    Dim conv As ByteConverter

    'Checagem da versão do ANDROID (Cria objeto Versao e carrega a string da versão do sistema)
    Dim Versao As ApplicationWS '
    Versao.Initialize
    Versao.setVersionString(OS.Release)

    Pr = ""

    Connect = True

    If Versao.getVersionString_Number() < "3" Then    ' Versão do ANDROID menor que 3.0 utiliza a lib HTTP ( classes HttpClient e HttpRequest )
                                                    ' para requisições ao WEB Service
        Endereco = parametro.getWeb_Service & "/AtualizarPosicaoFilaEspera"
        HttpAtualizar_Posicao.Initialize("HttpAtualizar_Posicao")
        reqAtualizar_Posicao.initializeget(Endereco)
        reqAtualizar_Posicao.Timeout = nTimeOut
        If HttpAtualizar_Posicao.Execute(reqAtualizar_Posicao, 0) = False Then
            Connect = False
        End If
    Else                                            ' Versão do ANDROID maior ou igual que 3.0 utiliza a classe HttpJob
                                                    ' para requisições ao WEB Service
        Endereco = parametro.getWeb_Service & "/AtualizarPosicaoFilaEspera"
        Pr = ""
        HJAtualizar_Posicao.Initialize("Atualizar_Posicao",Me)
        HJAtualizar_Posicao.PostString(Endereco,Pr)
        'Connect = HJAtualizar_Posicao.Success
    End If

    If Connect = False Then Return False

    Return True

End Sub

'#########################################################################################################
'# HttpAtualizar_Posicao                                                                                #
'#########################################################################################################
Sub HttpAtualizar_Posicao_ResponseSuccess (Response As HttpResponse, TaskId As Int)

    Retorna_Reservas_WS
    Retorna_Fila_Espera_WS

End Sub

Sub HttpAtualizar_Posicao_ResponseError (Reason As String, StatusCode As Int, TaskId As Int)
    Dim msg As String
    'Log(Reason)
    'Log(StatusCode)
    ProgressDialogHide
    msg = "Erro ao conectar no Web Service." & CRLF & "Atualizar a Posição na Fila de Espera"

    If Reason <> Null Then
        msg = msg & CRLF & "(" & StatusCode & ") " & Reason
    End If
    ToastMessageShow(msg, True)
End Sub

Method Returns Reservations

'#########################################################################################################
'# RESERVAS                                                                                              #
'#########################################################################################################
Sub Retorna_Reservas_WS() As Boolean
    Dim reqReservas As HttpRequest
    Dim Endereco, Pr As String
    Dim Para() As Byte
    Dim Connect As Boolean
    Dim Inp As InputStream
    Dim conv As ByteConverter

    'Checagem da versão do ANDROID (Cria objeto Versao e carrega a string da versão do sistema)
    Dim Versao As ApplicationWS '
    Versao.Initialize
    Versao.setVersionString(OS.Release)

    Pr = ""

    Connect = True

    If Versao.getVersionString_Number() < "3" Then    ' Versão do ANDROID menor que 3.0 utiliza a lib HTTP ( classes HttpClient e HttpRequest )
                                                    ' para requisições ao WEB Service
        Endereco = parametro.getWeb_Service & "/RetornaReservasFull"
        HttpReserva.Initialize("HttpReserva")
        reqReservas.initializeget(Endereco)
        reqReservas.Timeout = nTimeOut
        If HttpReserva.Execute(reqReservas, 0) = False Then
            Connect = False
        End If
    Else                                            ' Versão do ANDROID maior ou igual que 3.0 utiliza a classe HttpJob
                                                    ' para requisições ao WEB Service
        Endereco = parametro.getWeb_Service & "/RetornaReservasFull"
        Pr = ""
        HJReserva.Initialize("Reserva",Me)
        HJReserva.PostString(Endereco,Pr)
        'Connect = HJReserva.Success
    End If

    If Connect = False Then Return False

    Return True
End Sub

Sub HttpReserva_ResponseSuccess (Response As HttpResponse, TaskId As Int)
    Dim result As String
    Dim In As InputStream

    'Log("ResponseSuccess")
    ProgressDialogHide

    result = Response.GetString("UTF8") 'Convert the response to a string
    'Log(result)
    'Msgbox(result, "")

    'Usuarios
    'ProgressDialogShow("Atualizando Tabela Usuarios...")
    If File.Exists(File.DirDefaultExternal,"Reserva.xml") = True Then
        File.Delete(File.DirDefaultExternal,"Reserva.xml")
    End If
   
    File.WriteString(File.DirDefaultExternal,"Reserva.xml",result)

    parserReserva.Initialize

    'parse the xml file
    In = File.OpenInput(File.DirDefaultExternal, "Reserva.xml")
    parserReserva.parse(In, "parserReserva")
    In.Close
    File.Delete(File.DirDefaultExternal, "Reserva.xml")
    'ProgressDialogHide
   
End Sub

Sub  HttpReserva_ResponseError (Reason As String, StatusCode As Int, TaskId As Int)
    Dim msg As String
    'Log(Reason)
    'Log(StatusCode)
    'ProgressDialogHide
    msg = "Erro ao conectar no Web Service." & CRLF & "Reserva" 
   
    If Reason <> Null Then
        msg = msg & CRLF & "(" & StatusCode & ") " & Reason
    End If
    ToastMessageShow (msg, True)
End Sub

Sub parserReserva_StartElement (Uri As String, Name As String, Attributes As Attributes)
    If Name = "DataSet"         Then
        Reservas_Inicializa
    End If
    If Name = "Table" Then
        Reserva.Initialize
    End If
End Sub

Sub parserReserva_EndElement (Uri As String, Name As String, Text As StringBuilder)
    Dim cData, cHora As String
    'ToastMessageShow("Mesas" & CRLF & Uri & CRLF & Name & CRLF & Text,False)

    DoEvents

    If Name = "ID_Reservas" Then
        Reserva.setID_Reservas(Text)
    End If
    If Name = "Data" Then
        cData = Text.ToString.SubString2(8,10) & "/" & Text.ToString.SubString2(5,7) & "/" & Text.ToString.SubString2(0,4)
        cHora = Text.ToString.SubString2(11,19)
        Try
            Reserva.setData(DateTime.DateTimeParse(cData,cHora))
        Catch
            Reserva.setData(0)
        End Try
    End If
    If Name = "Nome" Then
        Reserva.setNome(Text)
    End If
    If Name = "Telefone" Then
        Reserva.setTelefone(Text)
    End If
    If Name = "SMS" Then
        Reserva.setSMS(Text)
    End If
    If Name = "Confirmado" Then
        Reserva.setConfirmado(Text)
    End If
    If Name = "Table" Then
        If MaxReserva <= 999 Then
            MaxReserva = MaxReserva + 1
            lReserva(MaxReserva).Assign(Reserva)
        End If
    End If
    If Name = "DataSet"         Then
        Atualiza_Reservas
    End If
End Sub

Method Returns Qeue

'#########################################################################################################
'# FILA_ESPERA                                                                                           #
'#########################################################################################################
Sub Retorna_Fila_Espera_WS() As Boolean
    Dim reqFila_Espera As HttpRequest
    Dim Endereco, Pr As String
    Dim Para() As Byte
    Dim Connect As Boolean
    Dim Inp As InputStream
    Dim conv As ByteConverter

    'Checagem da versão do ANDROID (Cria objeto Versao e carrega a string da versão do sistema)
    Dim Versao As ApplicationWS '
    Versao.Initialize
    Versao.setVersionString(OS.Release)

    Pr = ""

    Connect = True

    If Versao.getVersionString_Number() < "3" Then    ' Versão do ANDROID menor que 3.0 utiliza a lib HTTP ( classes HttpClient e HttpRequest )
                                                    ' para requisições ao WEB Service
        Endereco = parametro.getWeb_Service & "/RetornaFilaFull"
        HttpFila_Espera.Initialize("HttpFila_Espera")
        reqFila_Espera.initializeget(Endereco)
        reqFila_Espera.Timeout = nTimeOut
        If HttpFila_Espera.Execute(reqFila_Espera, 0) = False Then
            Connect = False
        End If
    Else                                            ' Versão do ANDROID maior ou igual que 3.0 utiliza a classe HttpJob
                                                    ' para requisições ao WEB Service
        Endereco = parametro.getWeb_Service & "/RetornaFilaFull"
        Pr = ""
        HJFila_Espera.Initialize("Fila_Espera",Me)
        HJFila_Espera.PostString(Endereco,Pr)
        'Connect = HJReserva.Success
    End If

    If Connect = False Then Return False

    Return True
End Sub

Sub HttpFila_Espera_ResponseSuccess (Response As HttpResponse, TaskId As Int)
    Dim result As String
    Dim In As InputStream

    'Log("ResponseSuccess")
    ProgressDialogHide

    result = Response.GetString("UTF8") 'Convert the response to a string
    'Log(result)
    'Msgbox(result, "")

    'Fila_Espera
    'ProgressDialogShow("Atualizando Tabela Fila_Espera...")
    If File.Exists(File.DirDefaultExternal,"Fila_Espera.xml") = True Then
        File.Delete(File.DirDefaultExternal,"Fila_Espera.xml")
    End If
   
    File.WriteString(File.DirDefaultExternal,"Fila_Espera.xml",result)

    parserFila_Espera.Initialize

    'parse the xml file
    In = File.OpenInput(File.DirDefaultExternal, "Fila_Espera.xml")
    parserFila_Espera.parse(In, "parserFila_Espera")
    In.Close
    File.Delete(File.DirDefaultExternal, "Fila_Espera.xml")
    'ProgressDialogHide
   
End Sub

Sub  HttpFila_Espera_ResponseError (Reason As String, StatusCode As Int, TaskId As Int)
    Dim msg As String
    'Log(Reason)
    'Log(StatusCode)
    'ProgressDialogHide
   
    lConfirma_Reserva = False
   
    msg = "Erro ao conectar no Web Service." & CRLF & "Fila_Espera" 
   
    If Reason <> Null Then
        msg = msg & CRLF & "(" & StatusCode & ") " & Reason
    End If
    ToastMessageShow (msg, True)
End Sub

Sub parserFila_Espera_StartElement (Uri As String, Name As String, Attributes As Attributes)
    If Name = "DataSet"         Then
        Fila_Espera_Inicializa
    End If
    If Name = "Table" Then
        Fila_Espera.Initialize
    End If
End Sub

Sub parserFila_Espera_EndElement (Uri As String, Name As String, Text As StringBuilder)
    Dim cData, cHora, msg As String
    'ToastMessageShow("Mesas" & CRLF & Uri & CRLF & Name & CRLF & Text,False)

    DoEvents

    If Name = "ID_Fila_Espera" Then
        Fila_Espera.setID_Fila_Espera(Text)
    End If
    If Name = "Posicao" Then
        Fila_Espera.setPosicao(Text)
    End If
    If Name = "Data" Then
        cData = Text.ToString.SubString2(8,10) & "/" & Text.ToString.SubString2(5,7) & "/" & Text.ToString.SubString2(0,4)
        cHora = Text.ToString.SubString2(11,19)
        Try
            Fila_Espera.setData(DateTime.DateTimeParse(cData,cHora))
        Catch
            Fila_Espera.setData(0)
        End Try
    End If
    If Name = "Nome" Then
        Fila_Espera.setNome(Text)
    End If
    If Name = "Telefone" Then
        Fila_Espera.setTelefone(Text)
    End If
    If Name = "SMS" Then
        Fila_Espera.setSMS(Text)
    End If
    If Name = "SMS_Qtd" Then
        Fila_Espera.setSMS_Qtd(Text)
    End If
    If Name = "Check_In" Then
        cData = Text.ToString.SubString2(8,10) & "/" & Text.ToString.SubString2(5,7) & "/" & Text.ToString.SubString2(0,4)
        cHora = Text.ToString.SubString2(11,19)
        Try
            Fila_Espera.setCheck_In(DateTime.DateTimeParse(cData,cHora))
        Catch
            Fila_Espera.setCheck_In(-1)
        End Try
    End If
    If Name = "ID_Reservas" Then
        Fila_Espera.setID_Reservas(Text)
    End If
    If Name = "Liberado" Then
        Fila_Espera.setLiberado(Text)
    End If
    If Name = "Desistiu" Then
        Fila_Espera.setDesistiu(Text)
    End If
    If Name = "Table" Then
        If MaxFila_Espera <= 999 Then
            MaxFila_Espera = MaxFila_Espera + 1
            lFila_Espera(MaxFila_Espera).Assign(Fila_Espera)
        End If
    End If
    If Name = "DataSet"         Then
        Atualiza_Fila_Espera
       
        If lConfirma_Reserva = True Then
            Envia_SMS_Confirmacao
        End If
       
        If nPosicao_Desistir_Fila <> -1 Then
            'Envio do SMS (adiciona na fila de envio)
            msg = SmartConfig.getMsg_Desistir().Replace("<#nome>", lFila_Espera(nPosicao_Desistir_Fila).getNome).Replace("<#pos>", lFila_Espera(nPosicao_Desistir_Fila).getPosicao)
            Add_SMS_Fila( lFila_Espera(nPosicao_Desistir_Fila).getTelefone, msg & CRLF & " " & CRLF & _
                                                            SmartConfig.getMsg_Promocional )
        End If
       
        GridFila_Espera_Select
       
        lConfirma_Reserva = False

    End If
End Sub

JobDone

'#########################################################################################################
'# HTTPJOB  JobDone                                                                                      #
'#########################################################################################################
Sub JobDone (Job As HttpJob)
    Dim In As InputStream
    Dim result As String

    ProgressDialogHide

    Log("JobName = " & Job.JobName & ", Success = " & Job.Success)
    If Job.Success = True Then
        result = Job.GetString 'Convert the response to a string

        Select Job.JobName
            Case "Reserva"
                'print the result to the logs
                'Log(result)
                'Msgbox(result,"Reserva")

                If File.Exists(File.DirDefaultExternal,"Reserva.xml") = True Then
                    File.Delete(File.DirDefaultExternal,"Reserva.xml")
                End If
   
                File.WriteString(File.DirDefaultExternal,"Reserva.xml",result)

                parserReserva.Initialize

                'parse the xml file
                In = File.OpenInput(File.DirDefaultExternal, "Reserva.xml")
                parserReserva.parse(In, "parserReserva")
                In.Close
                File.Delete(File.DirDefaultExternal, "Reserva.xml")

            Case "Fila_Espera"
                'print the result to the logs
                'Log(result)
                'Msgbox(result,"Fila_Espera")

                If File.Exists(File.DirDefaultExternal,"Fila_Espera.xml") = True Then
                    File.Delete(File.DirDefaultExternal,"Fila_Espera.xml")
                End If
   
                File.WriteString(File.DirDefaultExternal,"Fila_Espera.xml",result)

                parserFila_Espera.Initialize

                'parse the xml file
                In = File.OpenInput(File.DirDefaultExternal, "Fila_Espera.xml")
                parserFila_Espera.parse(In, "parserFila_Espera")
                In.Close
                File.Delete(File.DirDefaultExternal, "Fila_Espera.xml")

            Case "SmartConfig"
                'print the result to the logs
                'Log(result)
                'Msgbox(result,"SmartConfig")

                If File.Exists(File.DirDefaultExternal,"SmartConfig.xml") = True Then
                    File.Delete(File.DirDefaultExternal,"SmartConfig.xml")
                End If

                File.WriteString(File.DirDefaultExternal,"SmartConfig.xml",result)

                parserSmartConfig.Initialize

                'parse the xml file
                In = File.OpenInput(File.DirDefaultExternal, "SmartConfig.xml")
                parserSmartConfig.parse(In, "parserSmartConfig")
                In.Close
                File.Delete(File.DirDefaultExternal, "SmartConfig.xml")

            Case "ApagarReserva"
                Retorna_Reservas_WS

            Case "ConfirmarReserva"
                lConfirma_Reserva = True
                Atualizar_Posicao_Fila_Espera_WS
               
            Case "Atualizar_Posicao"   
                Retorna_Reservas_WS
                Retorna_Fila_Espera_WS

            Case "CheckIn_Fila"
                Atualizar_Posicao_Fila_Espera_WS
               
            Case "Desistir_Fila"
                Atualizar_Posicao_Fila_Espera_WS

            Case "Chamar_Fila"
                Atualizar_Posicao_Fila_Espera_WS
                nPosicao_Desistir_Fila = -1
        End Select
    Else
        Select Job.JobName
            Case "Fila_Espera"
                lConfirma_Reserva = False
            Case "ConfirmarReserva"
                lConfirma_Reserva = False
            Case "Desistir_Fila"
                nPosicao_Desistir_Fila = -1
           
        End Select

        Log("Erro: " & Job.ErrorMessage)
        ToastMessageShow("Erro: " & Job.ErrorMessage, True)
    End If
    Job.Release
End Sub

Confirmation by sending SMS (add a table to track the shipment)

Sub Envia_SMS_Confirmacao
    Dim msg As String
    Dim nFila_Espera_Ant As Int
    For x = 0 To MaxFila_Espera
        If    lFila_Espera(x).getPosicao <> 0  _
          AND lFila_Espera(x).getLiberado = "S" _
          AND lFila_Espera(x).getSms = "S"      _
          AND lFila_Espera(x).getSMS_Qtd = 0    _
          AND lFila_Espera(x).getCheck_In = (-1) Then
         
            'Envio do SMS  Boas Vindas (adiciona na fila de envio)
            msg = SmartConfig.getMsg_BoasVindas().Replace("<#nome>", lFila_Espera(x).getNome).Replace("<#pos>", lFila_Espera(x).getPosicao)
            Add_SMS_Fila( lFila_Espera(x).getTelefone, msg & CRLF & " " & CRLF & SmartConfig.getMsg_Promocional )
            'Envio do SMS  Instruções (adiciona na fila de envio)
            msg = SmartConfig.getMsg_Instrucao().Replace("<#nome>", lFila_Espera(x).getNome).Replace("<#pos>", lFila_Espera(x).getPosicao)
            Add_SMS_Fila( lFila_Espera(x).getTelefone, msg & CRLF & " " & CRLF & SmartConfig.getMsg_Promocional )
           
            'Atualiza Chamadas
            nFila_Espera_Ant = nFila_Espera
            nFila_Espera = x
            Chamar_Fila_WS
            nFila_Espera = nFila_Espera_Ant
         
        End If 
    Next
   
End Sub

What can be done to eliminate this error?

 

[consultatech4android]

I noticed that the error occurs when the fires of getString HttpJob, calling getString2 that references a folder / file on the device. Possibly the call should be several web methods deleting files that have not been used.
I need to have precise control of execution and return of the methods mentioned above.

 

[Erel]

Which line raises this error? I recommend you to only use HttpUtils2. Your current code will fail on Android 4+.

 

[consultatech4android]

Erel, therefore, as the version of android I use it or not.

    If Versao.getVersionString_Number() < "3" Then    ' Version ANDROID less than 3.0 uses the lib HTTP (classes HttpClient and HttpRequest)
                                                    'requests to the Web Service
        ...
        ...

    Else                                            ' ANDROID version greater than or equal to 3.0 uses class HttpJob
                                                    'requests to the Web Service
        ...
        ...
    End If

 

[consultatech4android]

Just to inform:

I managed to solve the issue by creating a line of web methods, where we inform each method parameter and its implementation on a table. Then I created a service execution for web methods, that every five seconds reads the first method inserted in the queue, executes it, and then remove it from the queue. With that solved the problem of sequential execution of methods, and also the error noted above did not happen anymore.

If anyone has the same problem and need guidance, just contact me.