NET/MASTER Network Control Language (NCL) Programmer's Guide

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Setting Server Class Characteristics

Working With Pathway Server Classes

15–16 106160 Tandem Computers Incorporated

Specifying Reply Message

Structure

Two types of messages flow between an NCL PATHSEND requester and a server

process: request messages, which flow from the NCL PATHSEND requester to the

server process; and reply messages, which flow from the server process to the NCL

PATHSEND requester.

When a PSEND OPEN verb makes a server class available, it can use the FORMAT

and MAP operands of the PSEND OPEN verb to specify the structure of reply

messages (but not request messages). Reply messages can be either mapped or

unmapped. The following example makes a server class available and specifies that

reply messages are mapped using the map REPMAP:

PSEND OPEN ID=PSC_1 FORMAT=MAPPED MAP=REPMAP

The options for specifying reply (and request) message structure are discussed in more

detail later in this section.

Setting Server Class

Characteristics

All server classes have unique characteristics. After you make a server class available

for use by an NCL process, you can use the PSEND SET verb to explicitly set the

current server class characteristics.

Specifying the Current

Server Class Identifier

The current server class is the last server class that was explicitly identified in a

PSEND verb. The current server class is the server class with which NCL assumes it is

to work if a PSEND verb does not explicitly target a server class. You use the ID

operand in a PSEND verb to explicitly specify an identifier.

You can set the current server class in two ways:

Using the PSEND SET verb with the ID operand

Using any other PSEND verb that identifies a server class by identifier

Either technique results in a new current server class. The result of setting a server

class as the current server class is that PSEND verbs (except PSEND OPEN) do not

have to explicitly identify a server class to work on it.

Specifying the Current

Reply Message Structure

Reply message structure—mapped or unmapped—is normally specified using the

PSEND OPEN verb when a server class is made available for use by an NCL process.

You can specify reply message structure using the PSEND SET verb. This allows you