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-- C954011.A

--

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--

-- OBJECTIVE:

--      Check that a requeue is placed on the correct entry; that the

--      original caller waits for the completion of the requeued rendezvous;

--      that the original caller continues after the rendezvous.

--      Specifically, this test checks requeue to an entry in a different

--      task, requeue where the entry has parameters, and requeue with

--      abort.

--

-- TEST DESCRIPTION:

--      In the Distributor task, requeue two successive calls on the entries

--      of two separate target tasks.  Each task in each of the  paths adds

--      identifying information in the transaction being passed.  This

--      information is checked by the Message tasks on completion ensuring that

--      the requeues have been placed on the correct queues.

--

--      This series of tests uses a simulation of a transaction driven

--      processing system.  Line Drivers accept input from an external source

--      and build them into transaction records.  These records are then

--      encapsulated in message tasks which remain extant for the life of the

--      transaction in the system. The message tasks put themselves on the

--      input queue of a Distributor which, from information in the

--      transaction and/or system load conditions forwards them to other

--      operating tasks. These in turn might forward the transactions to yet

--      other tasks for further action.  The routing is, in real life,

--      dynamic and unpredictable at the time of message generation. All

--      rerouting in this  model is done by means of requeues.

--

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--      26 Nov 95   SAIC    Fixed problems with shared global variables

--                          for ACVC 2.0.1

--

--!

with Report;

with ImpDef;

procedure C954011 is

   -- Arbitrary test values

   Credit_Return : constant := 1;

   Debit_Return  : constant := 2;

   type Transaction_Code is (Credit, Debit);

   type Transaction_Record;

   type acc_Transaction_Record is access Transaction_Record;

   type Transaction_Record is

      record

         ID               : integer := 0;

         Code             : Transaction_Code := Debit;

         Account_Number   : integer := 0;

         Stock_Number     : integer := 0;

         Quantity         : integer := 0;

         Return_Value     : integer := 0;

         TC_Message_Count : integer := 0;

         TC_Thru_Distrib  : Boolean := false;

      end record;

   protected type Message_Mgr is

      procedure Mark_Complete;

      function Is_Complete return Boolean;

   private

      Complete : Boolean := False;

   end Message_Mgr;

   protected body Message_Mgr is

      procedure Mark_Complete is

      begin

         Complete := True;

      end Mark_Complete;

      Function Is_Complete return Boolean is

      begin

         return Complete;

      end Is_Complete;

   end Message_Mgr;

   TC_Debit_Message  : Message_Mgr;

   TC_Credit_Message : Message_Mgr;

   task type Message_Task is

      entry Accept_Transaction (In_Transaction : acc_Transaction_Record);

   end Message_Task;

   type acc_Message_Task is access Message_Task;

   task Line_Driver is

      entry Start;

   end Line_Driver;

   task Distributor is

      entry Input(Transaction : acc_Transaction_Record);

   end Distributor;

   task Credit_Computation is

      entry Input(Transaction : acc_Transaction_Record);

   end Credit_Computation;

   task Debit_Computation is

      entry Input(Transaction : acc_Transaction_Record);

   end Debit_Computation;

   -- Assemble messages received from an external source

   --   Creates a message task for each. The message tasks remain extant

   --   for the life of the messages in the system.

   --      The Line Driver task would normally be designed to loop continuously

   --      creating the messages as input is received.  Simulate this

   --      but limit it to two dummy messages for this test and allow it

   --      to terminate at that point

   --

   task body Line_Driver is

      Current_ID : integer := 1;

      TC_Last_was_for_credit : Boolean := false;

      procedure Build_Credit_Record

                              ( Next_Transaction : acc_Transaction_Record ) is

         Dummy_Account : constant integer := 100;

      begin

            Next_Transaction.ID := Current_ID;

            Next_Transaction.Code := Credit;

            Next_Transaction.Account_Number := Dummy_Account;

            Current_ID := Current_ID + 1;

      end Build_Credit_Record;

      procedure Build_Debit_Record

                              ( Next_Transaction : acc_Transaction_Record ) is

         Dummy_Account : constant integer := 200;

      begin

            Next_Transaction.ID := Current_ID;

            Next_Transaction.Code := Debit;

            Next_Transaction.Account_Number := Dummy_Account;

            Current_ID := Current_ID + 1;

      end Build_Debit_Record;

   begin

      accept Start;      -- Wait for trigger from Main

      for i in 1..2 loop  -- arbitrarily limit to two messages for the test

         declare

            -- Create a task for the next message

            Next_Message_Task : acc_Message_Task := new Message_Task;

            -- Create a record for it

            Next_Transaction : acc_Transaction_Record

                                                 := new Transaction_Record;

         begin

            if TC_Last_was_for_credit then

               Build_Debit_Record ( Next_Transaction );

            else

               Build_Credit_Record( Next_Transaction );

               TC_Last_was_for_credit := true;

            end if;

            Next_Message_Task.Accept_Transaction ( Next_Transaction );

         end;   -- declare

      end loop;

   exception

      when others =>

         Report.Failed ("Unexpected exception in Line_Driver");

   end Line_Driver;

   task body Message_Task is

      TC_Original_Transaction_Code : Transaction_Code;

      This_Transaction : acc_Transaction_Record := new Transaction_Record;

   begin

      accept Accept_Transaction (In_Transaction : acc_Transaction_Record) do

         This_Transaction.all := In_Transaction.all;

      end Accept_Transaction;

      -- Note the original code to ensure correct return

      TC_Original_Transaction_Code := This_Transaction.Code;

      -- Queue up on Distributor's Input queue

      Distributor.Input ( This_Transaction );

      -- This task will now wait for the requeued rendezvous

      -- to complete before proceeding

      -- After the required computations have been performed

      -- return the Transaction_Record appropriately (probably to an output

      -- line driver)

      null;            -- stub

      -- The following is all Test Control Code

      -- Check that the return values are as expected

      if TC_Original_Transaction_Code /= This_Transaction.Code then

         -- Incorrect rendezvous

         Report.Failed ("Message Task: Incorrect code returned");

      end if;

      if This_Transaction.Code = Credit then

         if This_Transaction.Return_Value     /= Credit_Return or

            This_Transaction.TC_Message_Count /= 1             or not

            This_Transaction.TC_Thru_Distrib     then

               Report.Failed ("Expected path not traversed");

         end if;

         TC_Credit_Message.Mark_Complete;

      else

         if This_Transaction.Return_Value     /= Debit_Return or

            This_Transaction.TC_Message_Count /= 1             or not

            This_Transaction.TC_Thru_Distrib      then

               Report.Failed ("Expected path not traversed");

         end if;

         TC_Debit_Message.Mark_Complete;

      end if;

   exception

      when others =>

         Report.Failed ("Unexpected exception in Message_Task");

   end Message_Task;

   -- Dispose each input Transaction_Record to the appropriate

   -- computation tasks

   --

   task body Distributor is

   begin

      loop

         select

            accept Input (Transaction : acc_Transaction_Record) do

               -- Mark the message as having passed through the distributor

               Transaction.TC_Thru_Distrib := true;

               -- Pass this transaction on the appropriate computation

               -- task

               case Transaction.Code is

                  when Credit =>

                     requeue Credit_Computation.Input with abort;

                  when Debit =>

                     requeue Debit_Computation.Input with abort;

               end case;

            end Input;

         or

            terminate;

         end select;

      end loop;

   exception

      when others =>

         Report.Failed ("Unexpected exception in Distributor");

   end Distributor;

   -- Computation task.

   --   Note:  After the computation is performed in this task and the

   --          accept body is completed the rendezvous in the original

   --          message task is completed.

   --

   task body Credit_Computation is

      Message_Count   : integer := 0;

   begin

      loop

         select

            accept Input ( Transaction : acc_Transaction_Record) do

               -- Perform the computations required for this transaction

               null;      -- stub

               -- For the test:

               if not Transaction.TC_Thru_Distrib then

                  Report.Failed

                         ("Credit Task: Wrong queue, Distributor bypassed");

               end if;

               if Transaction.code /= Credit then

                  Report.Failed

                         ("Credit Task: Requeue delivered to the wrong queue");

               end if;

               -- for the test plug a known value and count

               Transaction.Return_Value := Credit_Return;

               -- one, and only one message should pass through

               Message_Count := Message_Count + 1;

               Transaction.TC_Message_Count := Message_Count;

            end Input;

         or

            terminate;

         end select;

      end loop;

   exception

      when others =>

         Report.Failed ("Unexpected exception in Credit_Computation");

   end Credit_Computation;

   -- Computation task.

   --   Note:  After the computation is performed in this task and the

   --          accept body is completed the rendezvous in the original

   --          message task is completed.

   --

   task body Debit_Computation is

      Message_Count   : integer := 0;

   begin

      loop

         select

            accept Input (Transaction : acc_Transaction_Record) do

               -- Perform the computations required for this message

               null;      -- stub

               -- For the test:

               if not Transaction.TC_Thru_Distrib then

                  Report.Failed

                         ("Debit Task: Wrong queue, Distributor bypassed");

               end if;

               if Transaction.code /= Debit then

                  Report.Failed

                         ("Debit Task: Requeue delivered to the wrong queue");

               end if;

               -- for the test plug a known value and count

               Transaction.Return_Value := Debit_Return;

               -- one, and only one, message should pass through

               Message_Count := Message_Count + 1;

               Transaction.TC_Message_Count := Message_Count;

            end Input;

         or

            terminate;

         end select;

      end loop;

   exception

      when others =>

         Report.Failed ("Unexpected exception in Debit_Computation");

   end Debit_Computation;

begin -- c954011

   Report.Test ("C954011", "Requeue from task body to task entry");

   Line_Driver.Start;        -- Start the test

   -- Ensure that the message tasks complete before reporting the result

   while not (TC_Credit_Message.Is_Complete and

              TC_Debit_Message.Is_Complete) loop

      delay ImpDef.Minimum_Task_Switch;

   end loop;

   Report.Result;

end C954011;