SeeView Server Gateway (SSG) Manual

Introducing SSG
HP NonStop SeeView Server Gateway (SSG) Manual—526356-004
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SSG Messaging
SSG Messaging
SSG messaging is achieved via a combination of built-in low-level SeeView messaging
services coupled with high-level request/reply functions provided by the SSGshell
script, as shown in Figure 1-10.
SeeView handles low-level interprocess communication message functions,
automatically managing processes, allocating memory, blocking messages, recovering
from errors, and queuing prompts.
SSGshell handles the high-level request/reply client-to-CI message functions,
providing private and shared context services.
Together, the CSG and SSG provide efficient access to hundreds of host-based
command interpreter threads.
SSG Key Points to Remember
•
The SSG provides a generalized command interpreter gateway.
•
The gateway provides process management, interprocess message caching, and
automatic process recovery.
•
The gateway provides private and shared command interpreter context services.
•
The SSG acts as a proxy agent, solving the linker-to-linker problem and also
reducing message overhead.
•
The SSG reduces the number of host command interpreter servers because it
allows shared CI resources.
•
The SSG provides automatic message blocking, boxcarring, and a segmented
message protocol to handle messages greater than 32K.
Figure 1-10. SSG Messaging
Client
WriteRead
Reply
WriteRead
Reply
WriteRead
Reply
SSG
Open, WriteRead
Client
Cache
Client
Cache
Cache
Cache
Cache
Cache
CI
Open, WriteRead
Open, WriteRead
CI
CI
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