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Designing Server Programs......................................................................................................43
Design Considerations........................................................................................................43
Server Program Structure.....................................................................................................47
Designing Applications for Batch Processing..............................................................................50
3 Writing Pathsend Requesters......................................................................51
The Pathsend Procedure Calls...................................................................................................51
Interprocess Communication in the Pathsend Environment.............................................................52
Basic Pathsend Programming...................................................................................................52
Programming for Failure Recovery........................................................................................53
Security Issues...................................................................................................................57
Avoiding Coded PATHMON Names....................................................................................58
Context-Sensitive Pathsend Programming....................................................................................58
Using Context-Sensitive Requesters With Context-Free Servers..................................................59
Resource Utilization............................................................................................................59
Programming for Failure Recovery........................................................................................59
ACS Restart Errors..............................................................................................................60
Cancellation of Server-Class Send Operations.......................................................................60
Writing Requesters That Interoperate With NonStop Tuxedo Servers..............................................60
4 Writing Pathway Servers............................................................................62
Basic Pathway Server Programming...........................................................................................62
Servers Shared by Different Types of Requesters.....................................................................62
Guardian Servers and Pathway Servers.................................................................................62
Server Stop Protocol...........................................................................................................63
Handling of Messages from $RECEIVE.................................................................................63
Pathsend Requester Failures.................................................................................................63
LINKMON Process Failures.................................................................................................63
ACS Subsystem Failures......................................................................................................63
Linkage Space Considerations.............................................................................................63
Considerations for Servers Used With SCREEN COBOL Requesters..........................................64
Consideration for Servers Used With RSC/MP Clients.............................................................64
Nested Servers..................................................................................................................64
Using Context-Free Servers With Context-Sensitive Requesters..................................................64
Considerations for Servers That Use the TMF Subsystem...............................................................65
Recommended Structure for Applications...............................................................................65
Writing a Server to Use the TMF Subsystem...........................................................................66
Using Audited and Nonaudited Files....................................................................................66
Locking Records.................................................................................................................67
Grouping Transaction Operations........................................................................................67
Servers as Process Pairs......................................................................................................68
Transaction Deadlocks........................................................................................................69
Considerations for Debugging Pathway Servers..........................................................................69
LINKMON Process and TCP Timeouts...................................................................................69
PATHMON Process Timeouts...............................................................................................70
Server Timeouts.................................................................................................................70
Avoiding Timeout Errors......................................................................................................70
Writing Context-Sensitive Servers..............................................................................................70
Functions of a Context-Sensitive Server..................................................................................71
Detecting a Newly Established Dialog..................................................................................71
Receiving, Servicing, and Replying to Messages in a Dialog....................................................71
Correlating Messages With a Dialog....................................................................................73
Continuing a Dialog...........................................................................................................73
Aborting a Dialog..............................................................................................................73
Terminating a Dialog..........................................................................................................73
Detecting an Aborted Dialog...............................................................................................73
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