MkErrorC_JV_API

MkErrorC - the class known as err or error is used to create and manage an error message … More...

Collaboration diagram for MkErrorC_JV_API:

Topics
	MkErrorC_Class_JV_API
	MkErrorC - define the class …
	MkErrorC_TOR_JV_API
	MkErrorC - various functions to 'create' and 'delete' a MkErrorS …
	MkErrorC_System_JV_API
	MkErrorC - various functions to raise a 'System' messagen on MkErrorS …
	MkErrorC_Signal_JV_API
	MkErrorC - various functions to set and check a 'signal' on a MkErrorS …
	MkErrorC_Get_JV_API
	MkErrorC - various functions to 'get' data out of a MkErrorS …
	MkErrorC_Raise_JV_API
	MkErrorC - various functions to 'raise' a MkErrorS …
	MkErrorC_Misc_JV_API
	MkErrorC - various functions to 'work' on a MkErrorS …

Classes
class	jvmkkernel.MkErrorC
	MkErrorC - the class known as err or error is used to create and manage an error message … More...

Detailed Description

MkErrorC - the class known as err or error is used to create and manage an error message …

An error is a singleton object per thread created at startup and is located at MkRuntimeRLS using the datatype MkErrorC.

‍As error-indicator the enum MkErrorE is used.

The MkErrorC is used to collect all data needed to handle an error and provide global ressources required to process and report the error.

The MkErrorC is also used to integrate the error-handling from jvmkkernel into the error-handling-code of the target Java.

Example from Filter6.java → use MqContextErrorCatch to convert a Java error into a jvmkkernel error

  public static void main(String[] argv) {
    MqContextC srv = MqFactoryC.Add(Filter6.class).New();
    try {
      srv.LinkCreate(argv);
      srv.ProcessEvent(MqWaitOnEventE.FOREVER);
    } catch (Throwable e) {
      srv.ErrorCatch(e);
    } finally {
      srv.Exit();
    }
  }

MkExceptionC

MkExceptionC - The default-exception of the Programming-Language-Micro-Kernel (PLMK) …

The Programming-Language-Micro-Kernel (PLMK) provide with MkErrorC a complete error-handling with focus to support the "C" Programming-Language. The support include catch, raise, signal and attributes. In addition every Target-Programming-Language (TPL) add their own error-handling and the purpose of MkExceptionC is to integrate the MkErrorC into the Target-Programming-Language (TPL).

The default-exception MkExceptionC is used to connect the MkErrorC with the Target-Programming-Language (TPL) error-object.

• The default-error is defined in MkRuntimeS::error_mk.
• On error the default-error is set to the error-data, the MkErrorE status change to MK_ERROR.
• The non-C language create a copy from the default-error and throw the copy as MkExceptionC exception.
• The C language just return the MkErrorE status of the default-error.

The implementation of an exception depends heavily on the Target-Programming-Language (TPL), starting with no exception at all, for example. C, an exception as a class object, or as an exception as a global attribute.

Attention

• All MkExceptionC code is implemented at the Target-Programming-Language (TPL) without support by the Programming-Language-Micro-Kernel (PLMK) compiler.
• By default, MkExceptionC is only used internally, hidden by the class MkErrorC.

ExceptionCheck

Checks if Exception is of type MkExceptionC and returns true or false …

Example: test case to check KILL and RECOVER feature, check on MkExceptionC

          var VAL = ReadBUF();
          mycl = new Client();
          mycl.LinkCreate(ConfigGetStartAs());
          int PID = (int) mycl.Send("W", "GPID@I");
          int RET=0;
          SysKill(PID,9);
          for (int i = 0; i < 3; i++) {
            try {
              RET = (int) mycl.Send("W", "ECOI:U@I", VAL);
            } catch (MkExceptionC ex) {
              var err = mycl.ErrorCatch(ex);
              if (err.IsSOCKET()) {
                err.Reset();
                mycl.LinkConnect();
                continue;
              } else {
                err.Raise();
              }
            }
            break;
          }
          SendSTART();
          SendI32(RET);

Returns

the result of the check, true or false

Parameters

[in]

exception

the exception object from Java, if null the global exception object is used