rfc2188.txt

<VC++网络游戏建摸与实现>源代码

   The ESROS-INVOKE service is used by an ESROS-User (the invoker) to
   cause the invocation of an OPERATION to be performed by the other
   ESROS-User (the performer).

   ESROS Invoker User issues ESROS-INVOKE.request primitive to invoke an
   operation.

   ESROS-INVOKE.indication primitive provides the ESROS Performer User
   with the parameters of the invoked operation.

   ESRO Service Provider issues the ESROS-INVOKE-P.confirm primitive to
   provide the ESROS Invoker User with Invoke-ID of the invoked
   operation.

   The related service structure consists of three service primitives as
   illustrated in Figure 3 and Table 5.

2.4.1  Operation-value

   This value is the identifier of the operation to be invoked.  The
   value is agreed upon between the ESROS Users.  This parameter has to
   be supplied by the invoker of the service.

   ESROS Invoker User provides the Operation-value parameter for the
   ESROS-INVOKE.request primitive.  The Operation-value parameter of
   ESROS-INVOKE.indication is provided to the ESROS Performer User.



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RFC 2188                          ESRO                    September 1997


          _____________________________________________________________
          | Primitive                |Parameters                       |
          |__________________________|_________________________________|
          |                          |Operation-value                  |
          |                          |Performer-address                |
          | ESROS-INVOKE.request     |Invoke-argument-encoding-type    |
          |                          |Invoke-argument                  |
          |__________________________|_________________________________|
          |                          |Operation-value                  |
          |                          |Invoker-address                  |
          |                          |Invoke-argument-encoding-type    |
          | ESROS-INVOKE.indication  |Invoke-argument                  |
          |                          |Invoke-ID                        |
          |__________________________|_________________________________|
          | ESROS-INVOKE-P.confirm   |Invoke-ID                        |
          |                          |Failure-value                    |
          |__________________________|_________________________________|
          | ESROS-FAILURE.indication |Invoke-ID                        |
          |__________________________|_________________________________|


     Table 5:  ESROS-INVOKE service primitives and associated parameters




2.4.2  Performer-address

   This parameter is the address of the ESROS Performer User which
   consists of ESRO Service Access Point (SAP) Selector, Transport
   Service Access Point (TSAP) Selector (e.g., port number), and Network
   Service Access Point (NSAP) address (e.g., IP address).  This
   parameter has to be supplied by the invoker of the service.

   ESROS Invoker User provides the Performer-address parameter for the
   ESROS-INVOKE.request primitive.

2.4.3  Invoker-address

   This parameter is the address of the ESROS Invoker User which
   consists of ESRO Service Access Point (SAP) Selector, Transport
   Service Access Point (TSAP) Selector (e.g.  port number), and Network
   Service Access Point (NSAP) address (e.g.  IP address).

   The Invoker-address parameter of ESROS-INVOKE.indication is provided
   to the ESROS Performer User.





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RFC 2188                          ESRO                    September 1997


2.4.4  Invoke-argument-encoding-type

   This parameter identifies the encoding type of the Invoke-argument
   (see next subsection).  The encoding type has to be agreed upon
   between ESROS Users.  This parameter has to be supplied by the
   invoker of the service.

   ESROS Invoker User provides the Invoke-argument-encoding-type
   parameter for the ESROS-INVOKE.request primitive.  The Invoke-
   argument-encoding-type parameter of ESROS-INVOKE.indication is
   provided to the ESROS Performer User.

2.4.5  Invoke-argument

   This parameter is the argument of the invoked operation.  The type
   has to be agreed between the ESROS Users.  This parameter has to be
   supplied by the invoker of the service.  Encoding type of the
   Invoke-argument is specified through the Invoke-argument-encoding-
   type parameter (see previous subsection).

   ESROS Invoker User provides the Invoke-argument parameter for the
   ESROS-INVOKE.request primitive.  The Invoke-argument parameter of
   ESROS-INVOKE.indication is provided to the ESROS Performer User.

2.4.6  Invoke-ID

   This parameter identifies the invocation of an ESROS-INVOKE service
   and is used to correlate this invocation with the corresponding
   replies (ESROS-RESULT, ESROS-ERROR, and ESROS-FAILURE services.)
   This parameter has to be supplied by the ESROS provider.

   This parameter distinguishes several invocations of the service in
   progress (asynchronous operations).  The ESROS provider may begin to
   reuse Invoke-ID values whenever it chooses, subject to the constraint
   that it may not reuse an Invoke-ID value that was previously assigned
   to an invocation of the service for which it expects, but has not yet
   received a reply.  In other words, the provider does not reuse a
   previously used Invoke-ID unless the corresponding service is fully
   completed.












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RFC 2188                          ESRO                    September 1997


2.4.7  Failure-value

   This parameter identifies the failure that occurred during the
   processing or transmission of any of the service primitives of ESROS.

                  Invoker        Performer
                 ESROS AP         ESROS AP
                       |               |
                       |               |
   ESROS-RESULT.ind.   |               | ESROS-RESULT.req.
   --------<-----------|               |--------<---------
                       |               |
                       |               | ESROS-RESULT.conf.
                       |               |-------->---------
                       |               |
                       |               | ESROS-FAILURE.ind.
                       |               |-------->---------
                       |               |


   Figure 4:  Time sequence diagram for ESROS-RESULT service



   This parameter has to be supplied by the ESROS provider (see also
   Section 2.7).

2.5  ESROS-RESULT Service

   The ESROS-RESULT service is used by an ESROS User to reply to a
   previous ESROS-INVOKE.indication in the case of a successfully
   performed operation.  This service is either confirmed or non-
   confirmed based on the service mode (see Section 2).

   The related service structure consists of three service primitives as
   illustrated in Figure 4 and Table 6.

2.5.1  Result-argument-encoding-type

   This parameter identifies the encoding type of the Result-argument
   (see next subsection).  The encoding type has to be agreed upon
   between the ESROS Users.  This parameter has to be supplied by the
   ESROS Performer User.

   ESROS Performer User provides the Result-argument-encoding-type
   parameter for the ESROS-RESULT.request primitive.  The Result-
   argument-encoding-type parameter of ESROS-RESULT.indication is
   provided to the ESROS Invoker User.



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RFC 2188                          ESRO                    September 1997


   ______________________________________________________________
   | Primitive                |Parameters                       |
   |__________________________|_________________________________|
   |                          |Result-argument-encoding-type    |
   |                          |Result-argument                  |
   | ESROS-RESULT.request     |Invoke-ID                        |
   |__________________________|_________________________________|
   |                          |                                 |
   |                          |Result-argument-encoding-type    |
   |                          |Result-argument                  |
   | ESROS-RESULT.indication  |Invoke-ID                        |
   |__________________________|_________________________________|
   |                          |                                 |
   | ESROS-RESULT.confirm     |Invoke-ID                        |
   |                          |Failure-value                    |
   |                          |                                 |
   |__________________________|_________________________________|
   | ESROS-FAILURE.indication |Invoke-ID                        |
   |__________________________|_________________________________|


   Table 6:  ESROS-RESULT service primitives and associated parameters




2.5.2  Result-argument

   This parameter is the result of an invoked and successfully performed
   operation.  The type has to be agreed between the ESROS Users.  This
   parameter has to be supplied by the invoker of the service.  Encoding
   type of the Result-argument is specified through the Result-
   argument-encoding-type parameter (see previous subsection).

   ESROS Performer User provides the Result-argument parameter for the
   ESROS-RESULT.request primitive.  The Result-argument parameter of
   ESROS-RESULT.indication is provided to the ESROS Invoker User.

2.5.3  Invoke-ID

   This parameter identifies the corresponding invocation.  This
   Invoke-ID, which is originally generated by the ESROS provider at the
   time of ESROS-INVOKE indication, is extracted from the Invoke ID that
   has to be supplied by the ESROS performer User.  The value is that of
   the corresponding ESROS-INVOKE.indication primitive.






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RFC 2188                          ESRO                    September 1997


                  Invoker        Performer
                 ESROS AP         ESROS AP
                       |               |
                       |               |
   ESROS-ERROR.ind.    |               | ESROS-ERROR.req.
   --------<-----------|               |--------<---------
                       |               |
                       |               | ESROS-ERROR.conf.
                       |               |-------->---------
                       |               |
                       |               | ESROS-FAILURE.ind.
                       |               |-------->---------


   Figure 5:  Time sequence diagram for ESROS-ERROR service




2.5.4  Failure-value

   This parameter identifies the failure that occurred during the
   processing or transmission of any of the service primitives of ESROS.
   This parameter has to be supplied by the ESROS provider (see also
   Section 2.7).

2.6  ESROS-ERROR Service

   The ESROS-ERROR service is used by an ESROS User to reply to a
   previous ESROS-INVOKE.indication in the case of an unsuccessfully
   performed operation.  This service is either confirmed or non-
   confirmed based on the service mode (see Section 2).

   The related service structure consists of three service primitives as
   illustrated in Figure 5 and Table 7.

2.6.1  Error-value

   This parameter identifies the error in reply to a previous ESROS-
   INVOKE.indication in the case of an unsuccessfully performed
   operation.  The value has to be agreed between the ESROS-Users.  This
   parameter has to be supplied by the ESROS Performer User.

   ESROS Performer User provides the Error-argument parameter for the
   ESROS-ERROR.request primitive.  The Error-argument parameter of
   ESROS-ERROR.indication is provided to the ESROS Invoker User.





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RFC 2188                          ESRO                    September 1997


          ________________________________________________________
          | Primitive                |Parameters                  |
          |__________________________|____________________________|
          |                          |Error-value                 |
          |                          |Error-argument-encoding-type|
          | ESROS-ERROR.request      |Error-argument              |
          |__________________________|____________________________|
          |                          |                            |
          |                          |Error-value                 |
          |                          |Error-argument-encoding-type|
          | ESROS-ERROR.indication   |Error-argument              |
          |                          |Invoke-ID                   |
          |                          |                            |
          |__________________________|____________________________|
          | ESROS-ERROR.confirm      |Invoke-ID                   |
          |                          |Failure-value               |
          |                          |                            |
          |__________________________|____________________________|
          | ESROS-FAILURE.indication |Invoke-ID                   |
          |__________________________|____________________________|



    Table 7:  ESROS-ERROR service primitives and associated parameters

2.6.2  Error-argument-encoding-type

   This parameter identifies the encoding type of the Error-argument
   (see next subsection).  The encoding type has to be agreed upon
   between the ESROS Users.  This parameter has to be supplied by the
   ESROS Performer User.

   ESROS Performer User provides the Error-argument-encoding-type
   parameter for the ESROS-ERROR.request primitive.  The Error-
   argument-encoding-type parameter of ESROS-ERROR.indication is
   provided to the ESROS Invoker User.