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Technical Reference: Communications, Volume 1
lb_$lookup_object Library Routine (NCS)
Purpose
Looks up information about an object in the Global
Location Broker (GLB) database.
Syntax
void lb_$lookup_object ( object, lookup_handle)
void lb_$lookup_object ( max_results, num_results, results, status)
uuid_$t *object;
lb_$lookup_handle_t *lookup_handle;
unsigned long max_results;
unsigned long *num_results;
lb_$entry_t results [ ];
status_$t *status;
Description
The lb_$lookup_object routine
returns GLB database entries whose fields in the object parameter match the specified object. It returns information about all
replicas of an object and all interfaces to the object.
The lb_$lookup_object routine
cannot return more than the number of matching entries specified by max_results parameter at one time. The lookup_handle parameter directs this routine to do sequential lookup calls to find
all matching entries.
Notes:
- The Location Broker does not prevent modification
of the database between lookup calls, which can cause the locations of entries
relative to a value of the lookup_handle parameter
to change. If multiple calls are made to find all matching results in the
database, the returned information may skip or duplicate entries from the
database.
- It is also possible for the results of a single
lookup call to skip or duplicate entries. This can occur if the size of the
results exceeds the size of a remote procedure call (RPC) packet (64KB).
Parameters
Input
object |
Points to the Universal Unique Identifier (UUID) of the object being
looked up. |
max_results |
Specifies the maximum number of matching entries that can be returned
by a single call. This should be the number of elements in the results parameter array. |
Input/Output
lookup_handle |
Specifies a location in the database. On input, the value of the lookup_handle parameter indicates the location in the
database where the search begins. An input value of lb_$default_lookup_handle specifies that the search starts at the beginning of the database. |
|
On return, the lookup_handle parameter indicates
the next unsearched part of the database (that is, the point at which the
next search should begin). A return value of lb_$default_lookup_handle indicates that the search reached the end of the database. Any other
value indicates that the search found at most the number of matching entries
specified by the max_results parameter before it reached
the end of the database. |
Output
num_results |
Points to the number of entries that were returned in the results parameter array. |
results |
Specifies the array that contains the matching GLB database entries,
up to the number specified in the max_results parameter.
If the array contains any entries for servers on the local network, those
entries appear first. |
status |
Points to the completion status. |
Examples
To look up GLB database entries for the bank bank_id, enter:
lb_$lookup_object(&bank_id, &lookup_handle, MAX_LOCS, &n_locs,
bank_loc, &st);
Related Information
Remote Procedure Call (RPC)
Runtime Library (NCS) in AIX 5L Version 5.2 Communications Programming Concepts.
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