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Message
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| vladd |
 Posted: Thu Mar 25, 2021 3:57 am Post subject: Monitoring event filters (IIB10) |
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Newbie
Joined: 25 Mar 2021
Posts: 4
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I need to capture some events using monitoring feature when a certain Boolean $Environment variable is TRUE. But I can't get it to work.
Until now I've tried the following to add in Filter XPath field:
1.
| Code: |
| $Environment/Variables/DebugLogging=true() |
DebugLogging = FALSE => LOG YES
DebugLogging = TRUE => LOG YES
2.
| Code: |
| $Environment/Variables[DebugLogging=true()] |
DebugLogging = FALSE => LOG NO
DebugLogging = TRUE => LOG NO
3.
| Code: |
| $Environment/Variables/DebugLogging |
DebugLogging = FALSE => LOG NO
DebugLogging = TRUE => LOG NO
4.
| Code: |
| $Environment/Variables/DebugLogging=TRUE |
DebugLogging = FALSE => LOG NO
DebugLogging = TRUE => LOG NO
5.
| Code: |
| $Environment/Variables/DebugLogging!=false() |
DebugLogging = FALSE => LOG YES
DebugLogging = TRUE => LOG YES
6.
| Code: |
| $Environment/Variables/DebugLogging=1 |
DebugLogging = FALSE => LOG NO
DebugLogging = TRUE => LOG NO
What am I doing wrong?   |
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| timber |
| Posted: Fri Mar 26, 2021 6:52 am Post subject: |
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Grand Master
Joined: 25 Aug 2015
Posts: 1292
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| vladd |
| Posted: Fri Mar 26, 2021 9:37 am Post subject: |
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Newbie
Joined: 25 Mar 2021
Posts: 4
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| timber wrote: |
See
The language accepted by this field is XPath, so there is no point in trying any expression that is not a valid XPath.
Are you sure that you are allowed to reference the Environment tree from this field? Have you tried referencing something in $Body to check that the filter mechanism is working? |
My first example is XPath 1.0 accepted (also simulated here freeformatter. com/xpath-tester.html#ad-output)
But your url helped a lot. It worked like this:
| Code: |
| $Environment/Variables/DebugLogging='true' |
Against all my believes and instincts but it works
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| timber |
| Posted: Mon Mar 29, 2021 1:29 am Post subject: |
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Grand Master
Joined: 25 Aug 2015
Posts: 1292
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| Quote: |
| your url helped a lot |
It's not mine. It is the IBM documentation for your task, so the first place that you should have looked!
I assume that your message flow is setting the Environment field to the string value 'true'. That explains why your XPaths did not work - they were testing for a Boolean result. |
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| vladd |
| Posted: Tue Mar 30, 2021 1:15 am Post subject: |
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Newbie
Joined: 25 Mar 2021
Posts: 4
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| timber wrote: |
| Quote: |
| your url helped a lot |
It's not mine. It is the IBM documentation for your task, so the first place that you should have looked!
I assume that your message flow is setting the Environment field to the string value 'true'. That explains why your XPaths did not work - they were testing for a Boolean result. |
No, actually it is SET as Boolean ( the value comes from an external Boolean variable), this is why is strange for me to evaluate it against 'true'. |
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| timber |
| Posted: Tue Mar 30, 2021 3:55 am Post subject: |
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Grand Master
Joined: 25 Aug 2015
Posts: 1292
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| Quote: |
| No, actually it is SET as Boolean |
Can you verify that using the output of a Trace node? |
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| vladd |
| Posted: Tue Mar 30, 2021 1:32 pm Post subject: |
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Newbie
Joined: 25 Mar 2021
Posts: 4
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| Code: |
2021-03-31 00:18:16.964778 83920 UserTrace BIP2537I: Node 'monitoring_test.Compute': Executing statement ''SET Environment.Variables.DebugLogging = DebugLogging;'' at ('.monitoring_test_Compute.Main', '5.3').
2021-03-31 00:18:16.964792 83920 UserTrace BIP2539I: Node '{5}': Evaluating expression '{4}' at ('DebugLogging', 'FALSE'). This resolved to ''DebugLogging''. The result was ''.
2021-03-31 00:18:16.964804 83920 UserTrace BIP2566I: Node 'monitoring_test.Compute': Assigning value ''FALSE'' to field / variable ''Environment.Variables.DebugLogging''.
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from debug i can see the variable is set as Boolean:
| Code: |
Environment
Variables
DebugLogging:BOOLEAN:false
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and the actual xPath evaluations are:
| Code: |
2021-03-31 00:18:16.965078 83920 UserTrace BIP4074I: The event filter on the event emitted by event source ''Log1.terminal.in'' in flow ''monitoring_test'' has been evaluated and returned 'TRUE'. The query text was ''$Environment/Variables/DebugLogging = true()''.
The event filter, which controls whether an event is emitted, has been evaluated for event source ''Log1.terminal.in'' in flow ''monitoring_test''.
The result of the evaluation was 'TRUE'.
The query text evaluated was ''$Environment/Variables/DebugLogging = true()''. |
and (the one that actually works):
| Code: |
2021-03-31 00:18:16.965258 83920 UserTrace BIP4074I: The event filter on the event emitted by event source ''Log2.terminal.in'' in flow ''monitoring_test'' has been evaluated and returned 'FALSE'. The query text was ''$Environment/Variables/DebugLogging = 'true'''.
The event filter, which controls whether an event is emitted, has been evaluated for event source ''Log2.terminal.in'' in flow ''monitoring_test''.
The result of the evaluation was 'FALSE'.
The query text evaluated was ''$Environment/Variables/DebugLogging = 'true'''. |
[/code] |
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| timber |
| Posted: Tue Mar 30, 2021 1:48 pm Post subject: |
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Grand Master
Joined: 25 Aug 2015
Posts: 1292
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| Thanks Vladd - that looks very much like a product defect to me. I think your first XPath should work. |
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