EMS Manual

EMS Manual—426909-005
16-1
16 Event Routing
This section describes dynamic routing of events by the printing distributor to selected
destinations:
Routing Capability
The printing distributor allows distribution of events to selected destinations. The
destinations are determined in the filter on an event basis, and a list of routing IDs is
passed by the filter interpreter to the distributor event processing logic. All potential
destinations are defined as profiles in the filter source and are stored in the filter object.
The maximum number of event sources allowed is ten. Likewise, the maximum
number of destinations for printing distributors is ten. There is no memory allocation
limitation. Buffer space is allocated from an extended segment. Future expansions are
easily accommodated.
Launching of Destination Processes
A routing distributor can start or restart a destination process. This feature, originally
required by TMDS for fault analyzers, is available for any process that has startup
parameters defined in its configuration profile. Destination processes must be able to
receive events, and overall response time is in direct relation to the slowest
destination. A time limit is set so the distributor does not hang up on a specific
destination.
A destination process is started or restarted when an event is received for it as a result
of a filter PASS statement. Security has been provided to prevent unauthorized
launching of processes. To safeguard against launching of processes that might inherit
super.super access from the distributor, a SPI command requesting the loading of a
filter that contains DESTINATION statements with startup information is accepted only
if the sender's access ID matches the access ID of the distributor process. A filter ADD
command is the only mechanism to introduce a new process for launching.
Topic Page
Routing Capability
16-1
Launching of Destination Processes 16-1
Formatting Selection 16-2
Multiple Filters 16-2
User Interfaces 16-3
Selection of Collectors for Internal Events 16-3
Distributor Generated Messages 16-4
Note. A routing distributor is a printing distributor with a filter that contains destination profiles.