Hello,
JMeter does not seem to include a test element that allows a string out of a
list to be assinged to a variable, guaranteeing at most once semantics for all
users, even in distributed mode. Meaning that every element of the list will
only be used once, even trhoughout multiple test runs.
I have the following in mind:
Creating a ConfigTestElement (currently a TestBean) which allows the user to
add a list of values. When starting the test, this list would be put into a
centrally accessible singleton and everytime a value would be read in
iterationStart, it would be removed from this central list and assigned to a
variable, similarly to CSV Data Set Config, only that the value is not read
from a file.
So far possible.
When the test is completed, only the remaining unused values should be present
in the test element. How can I modify a specific element in the test tree? If I
implement TestListener and change the list in testEnded, this change is not
applied to the test element if I open it in the test plan. It is probably
cloned, but even by overriding clone and keeping a reference to the original
element, I cannot get the test element's values changes.
Furthermore, in distributed mode, I would need to split the list in equal parts
to the different client hosts. This could be done somewhere in
ClientJMeterEngine#Configure, not cloning the element, but taking a sublist of
the complete list. The total number of hosts and the number of the current host
would need to be known for this. These two values could be filled into some
context in RemoteStart#doAction.
Every host would then perform its test run and at the end, they would need to
send back the sublist of unused items. As far as I understand, only the
Listeners are wrapped with RemoteListenerWrapper so that they can transfer back
information. Maybe the information which elements of the list were not used can
be piggybacked somewhere on testEnded? The compund list of remaining items
would then again need to be incorporated into the original test element - a
problem I already described above.
Any help in solving any of these sub tasks is very appreciated.
Jens
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