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HWKAPM-817 Add OT agent instrumentation rules for EJB #738

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objectiser commented Jan 13, 2017

@pavolloffay @jpkrohling Could review please?

Notes:

  • This PR includes basic instrumentation rules for demarcating Wildfly/EAP EJB usage. So is not a general EJB instrumentation approach - this could be investigated as a separate jira if there is a need (possibly using some additional class instrumentation outside byteman rules, leveraging the annotations).
  • Currently no tests, as existing agent tests do not rely on a separate server to be launched. Not sure whether it is work adding a specific test for this, or other approach would be to produce an example that includes EJBs, and test it in the instrumentation framework? Has been manually tested currently.

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I think an automated test would be beneficial to this. This is the kind of feature that might break without us realizing for some time.

IF !$2.getName().equals("onMessage")
DO
startSpanWithParent(getTracer().buildSpan($2.getName())
.withTag("EJB.uri", truncateAtDelimiter(simpleClassName($1),"$$$")),
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Is there a more reliable way to get the proxied bean name? Also, is this the bean name (interface), or the implementing class name? Would it be interesting to store also the kind of bean being invoked (Home, Local Home, Remote)?

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Its the implementing class name. I'll investigate, I originally copied some byteman rules someone else had created for tracking EJB usage.

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Agree automated is better, but depends whether we should have a set of tests that depend on a separate server to be launched (not sure how many of the agent rules would require this), or test by example (i.e. create a JEE example that incorporates EJBs, and verify the trace data using the instrumentation-test framework)?

If first option, we then have the choice between arquillian, which we haven't used so far, or just using the wildfly maven plugin?

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LGTM 👍

As Juca mentioned, have tests for this would be great.

@@ -435,4 +435,8 @@ protected TraceContext getTraceContext() {
}
return state;
}

public String toString() {
return super.toString() + "[operationName=" + getOperationName() + " state=" + state() + "]";
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super does not define toString() if it's added we end up with two operation names.

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If it can be tested with arqullian, it's better than instrumentation-framework I think. At least faster.

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