Could I immediately reset coverage history?

[Roger Hsu]

Hello everyone, I am a newbie to Jacoco. Currently I want to use Jacoco to dynamically track all the methods and classes that are called when performing some tasks.

However, Jacoco does not provide a direct reset command, which means that the output of the dump command will contain a lot of useless information, is there any way to clear the coverage history directly?

I built a REST API application for this, first, it connects to Jacoco Agent, when I request a certain endpoint of the REST application, it starts logging all the coverage information (as it is), then, I visit another endpoint , will stop logging and export coverage information.

The problem is that I can't guarantee that no code will be executed when I start recording coverage information. So I need to manually remove the interference.

Any suggestions?

[Marc Hoffmann]

Hi Roger,

our APIs support resetting coverage data. Depending on how you integrate with JaCoCo the relevant APIs are:

Runtime API (in process) / JMX

IAgend.reset()

Also note that the dump() method in the same interface has an boolean parameter to control whether execution data should be reset after the dump.

Remote Protocol

RemoteControlWriter.visitDumpCommand(boolean dump, boolean reset)

With the reset parameter set tu true this command will trigger a reset.

Regards,

-marc

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[Roger Hsu]

Hi Marc,

Thanks for your answer, I am connecting to jacoco through port 6300 (TCP mode), refer to the example of https://www.jacoco.org/jacoco/trunk/doc/examples/java/ExecutionDataClient.java

It provides writer.visitDumpCommand method, use for downloading data, but there is no way to call IAgent.

Not sure if I could call IAgent in remote control.

Regards,

Roger

Marc Hoffmann <hoff...@mountainminds.com> 于2023年6月11日周日 03:41写道：

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[Marc Hoffmann]

Hi Roger,

as I wrote in my answer you can set the “reset" parameter to true:

RemoteControlWriter.visitDumpCommand(boolean dump, boolean reset)

Regards,

-marc

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[Roger Hsu]

Thanks! It did solve my problem.