The Resource Pool (ResPool) service is described in section "8.15 Resource
Pool (ResPool) Service" in the STAF User's Guide at
http://staf.sourceforge.net/current/STAFUG.htm#HDRRESSRV. In particular,
see sub-section "8.15.10 REQUEST" for more information and examples
(especially in the "Command Line sub-sub-section") about how to request a
resource from a resource pool using the ResPool service.
A REQUEST request submitted to the ResPool service obtains exclusive
access to an entry in the resource pool. If an entry is available that
meets the specified criteria in the request, then the entry will become
owned by the STAF handle on the machine that submitted the REQUEST POOL
request to the ResPool service. If an entry is not currently available
that meets the specified criteria in the request, the request will be
added to the "Pending Requests" list in ascending order by "priority" and
then by the timestamp when the request was submitted, and the request will
wait indefinitely until a resource is available (or you can specify the
TIMEOUR option to specify the longest time you are willing to wait for a
resource to become available).
When you are finished with a resource, you can submit a RELEASE request to
the ResPool service so that that resource is now available and can be used
to satisfy other requests.
Here's an example of creating a machine pool containing 2 machines (via
the command line):
C:\>STAF local RESPOOL CREATE POOL MachinePool DESCRIPTION "Machine Pool"
Response
--------
C:\>STAF local RESPOOL ADD POOL MachinePool ENTRY machine1.company.com
Response
--------
C:\>STAF local RESPOOL ADD POOL MachinePool ENTRY machine2.company.com
Response
--------
You can query the pool and see that both of these machines in the machine
pool are currently available:
C:\>STAF local RESPOOL QUERY Pool MachinePool
Response
--------
{
Description : Machine Pool
Pending Requests: []
Resources : [
{
Entry: machine1.company.com
Owner: <None>
}
{
Entry: machine2.company.com
Owner: <None>
}
]
}
You can request an entry from this pool to obtain exclusive access to a
random machine in the pool so that while you own this resource, the
resource pool will not make this resource available to another REQUEST
submitted to the ResPool service for this resource pool. Note, instead
you could specify to request a particular entry from the pool or the first
available entry in the pool instead of requesting a random entry from the
pool. Since I'm showing you this example using the command line, I need
to create a STAF handle and set the STAF_HANDLE_NAME environment variable
to that handle number. If you were submitting these STAF service requests
via a Java/Python/Perl/Tclprogram, you would have already created a STAF
handle to use to submit STAF service requests, or if submitting this
request via a STAX job, a STAF handle is created automatically for each
STAX job and you can simply use the <stafcmd> element to submit a RESPOOL
REQUEST request (or another request to the RESPOOL service).
C:\>STAF local HANDLE CREATE HANDLE NAME ResourcePoolHandle
Response
--------
18
C:\>set STAF_STATIC_HANDLE=18
C:\>STAF local RESPOOL REQUEST POOL MachinePool
Response
--------
machine2.company.com
C:\>STAF local RESPOOL QUERY POOL MachinePool
Response
--------
{
Description : Machine Pool
Pending Requests: []
Resources : [
{
Entry: machine1.company.com
Owner: <None>
}
{
Entry: machine2.company.com
Owner: {
Machine : IBM-0JUBIF7T5B8
Handle Name : ResourcePoolHandle
Handle : 18
User : none://anonymous
Endpoint : local://local
Date-Time Requested : 20140326-15:43:04
Date-Time Acquired : 20140326-15:43:04
Perform Garbage Collection: Yes
}
}
]
}
You could then request another resource from this machine pool (via this
STAF handle or via another STAF handle, or another STAX job, etc) and you
will get the other available resource in the resource pool and now both
resources in this machine pool are owned (none are currently available to
be requested) as shown by the QUERY request:
C:\>STAF local RESPOOL REQUEST POOL MachinePool
Response
--------
machine1.company.com
C:\>STAF local RESPOOL QUERY POOL MachinePool
Response
--------
{
Description : Machine Pool
Pending Requests: []
Resources : [
{
Entry: machine1.company.com
Owner: {
Machine : IBM-0JUBIF7T5B8
Handle Name : ResourcePoolHandle
Handle : 18
User : none://anonymous
Endpoint : local://local
Date-Time Requested : 20140326-15:43:52
Date-Time Acquired : 20140326-15:43:52
Perform Garbage Collection: Yes
}
}
{
Entry: machine2.company.com
Owner: {
Machine : IBM-0JUBIF7T5B8
Handle Name : ResourcePoolHandle
Handle : 18
User : none://anonymous
Endpoint : local://local
Date-Time Requested : 20140326-15:43:04
Date-Time Acquired : 20140326-15:43:04
Perform Garbage Collection: Yes
}
}
]
}
Since all the resources in this machine pool are owned and none are
available, if you request another resource, the request will wait (will
not complete) until one of the resources are released.
C:\>STAF local RESPOOL REQUEST POOL MachinePool
If you opened another command prompt, and submitted a QUERY request to the
RESPOOL service to query the machine pool, you'll see that there is now an
entry in the "Pending Requests" list for this machine pool.
C:\>STAF local RESPOOL QUERY Pool MachinePool
Response
--------
{
Description : Machine Pool
Pending Requests: [
{
Priority : 50
Date-Time Requested : 20140326-15:44:06
Requested Entry : <None>
Machine : IBM-0JUBIF7T5B8
Handle Name : ResourcePoolHandle
Handle : 18
User : none://anonymous
Endpoint : local://local
Perform Garbage Collection: Yes
}
]
Resources : [
{
Entry: machine1.company.com
Owner: {
Machine : IBM-0JUBIF7T5B8
Handle Name : ResourcePoolHandle
Handle : 18
User : none://anonymous
Endpoint : local://local
Date-Time Requested : 20140326-15:43:52
Date-Time Acquired : 20140326-15:43:52
Perform Garbage Collection: Yes
}
}
{
Entry: machine2.company.com
Owner: {
Machine : IBM-0JUBIF7T5B8
Handle Name : ResourcePoolHandle
Handle : 18
User : none://anonymous
Endpoint : local://local
Date-Time Requested : 20140326-15:43:04
Date-Time Acquired : 20140326-15:43:04
Perform Garbage Collection: Yes
}
}
]
}
Once you release a machine that you own from the machine pool, then the
pending request will become satisfied:
C:\>STAF local RESPOOL RELEASE POOL MachinePool ENTRY machine2.company.com
Response
--------
C:\>STAF local RESPOOL QUERY POOL MachinePool
Response
--------
{
Description : Machine Pool
Pending Requests: []
Resources : [
{
Entry: machine1.company.com
Owner: {
Machine : IBM-0JUBIF7T5B8
Handle Name : ResourcePoolHandle
Handle : 18
User : none://anonymous
Endpoint : local://local
Date-Time Requested : 20140326-15:43:52
Date-Time Acquired : 20140326-15:43:52
Perform Garbage Collection: Yes
}
}
{
Entry: machine2.company.com
Owner: {
Machine : IBM-0JUBIF7T5B8
Handle Name : ResourcePoolHandle
Handle : 18
User : none://anonymous
Endpoint : local://local
Date-Time Requested : 20140326-15:44:06
Date-Time Acquired : 20140326-15:45:02
Perform Garbage Collection: Yes
}
}
]
}
Here's an example of releasing the machine1.company.com entry in the
machine pool and querying the machine pool to show that this entry is no
longer owned:
C:\>STAF local RESPOOL RELEASE POOL MachinePool ENTRY machine1.company.com
Response
--------
C:\>STAF local RESPOOL QUERY POOL MachinePool
Response
--------
{
Description : Machine Pool
Pending Requests: []
Resources : [
{
Entry: machine1.company.com
Owner: <None>
}
{
Entry: machine2.company.com
Owner: {
Machine : IBM-0JUBIF7T5B8
Handle Name : ResourcePoolHandle
Handle : 18
User : none://anonymous
Endpoint : local://local
Date-Time Requested : 20140326-15:44:06
Date-Time Acquired : 20140326-15:45:02
Perform Garbage Collection: Yes
}
}
]
}
Hope this helps you understand the ResPool service better.
--------------------------------------------------------------
Sharon Lucas
IBM Austin, [email protected]
(512) 286-7313 or Tieline 363-7313
From: "Zhu, Cindy" <[email protected]>
To: "[email protected]"
<[email protected]>,
Date: 03/25/2014 04:55 PM
Subject: [staf-users] ResPool Service
Hi,
We have a group of machines that needed to be shared by numerous test
cases. I guess ResPool service is the right one to go with.
Can you give me some examples or links of examples to show how to use this
service to run test cases whenever one resource in the pool is available?
Thanks,
Cindy
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