About

An open source project by OverOps.

Visit the site to download a sample result or read more on the blog

Requirements

• Groovy installed
• Gradle installed
• Java installed

Installation

• Download, unzip, and you’re ready to go

Run settings

• ./gradlew run (default parameters, generates one jar with 10 classes)
• cd output && gradle fatJar to build the generated project
• java -cp output/build/libs/tester.jar helpers.Main to run it

Or, you can simply run ./scripts/small.sh, or ./scripts/big.sh, with preconfigured run settings.

Flags

• -Poutput-directory (relative path to output directory)
• -Poutput-classes (number of classes to generate)
• -Psubprojects (number of jars to generate)

Keep in mind that generating over 500 classes will take quite some time. Our biggest run had 20,000 classes, but it's better to keep this under 5,000.

Running sub projects

• gradle build (get a WAR file)
• Go to bin
• A shell script is created per project, root will run them all

Advanced config

There are some additional options that give you fine grained control over the generated code, but might mess it up, use at your own risk:

• Low level config: src/main/groovy/generator/Config.groovy
• Higher level config is available in the output folder. There are more options to add logging, and fine tune the behavior of the application but it’s experimental at the moment.

If you’d like to learn more, feel free to reach out for a deeper walkthrough (hello@overops.com). Default settings are no logs, and an exception on every 10th frame in the call stack.

Docker Quick start

In simple cases the following command will allow for local execution of the image. If running backend and collector also in docker see "advance" networking section.

docker run -d --rm -e TAKIPI_COLLECTOR_HOST=<collector_hostname>  -e TAKIPI_COLLECTOR_PORT=6060 -e TAKIPI_APPLICATION_NAME=java-bullshifier -e TAKIPI_DEPLOYMENT_NAME=deployment1 -e TAKIPI_SERVER_NAME=DEV -e COLOR=white/yellow/red/black overops-java-bullshifier:latest

Note: Depending if you built or pulled the image your Image name may vary!

Docker: Advance Networking

If running multiple components in separate docker images (i.e. Backend and collector), it is recommend running with a docker network to allow for communications:

If not already created, create a docker network and start the image on the network:

docker network create --driver bridge overops

docker run -d --rm --network overops -e TAKIPI_COLLECTOR_HOST=<collector_hostname>  -e TAKIPI_COLLECTOR_PORT=6060 -e TAKIPI_APPLICATION_NAME=java-bullshifier -e TAKIPI_DEPLOYMENT_NAME=deployment1 -e TAKIPI_SERVER_NAME=DEV -e COLOR=<white/yellow/red/black> overops-java-bullshifier:latest

Note: This assumes you have a collector running in docker with --network overops --name overops-collector

The following table lists the configurable ENVS of the Java Bullshifier using -e:

Parameter	Description	Default
TAKIPI_COLLECTOR_HOST	Collector hostname or K8s Service Name	collector
TAKIPI_COLLECTOR_PORT	Collector port	6060
COLOR	The plan of the Bulshifier - affect on how intense will be the load on the application - (Options: white/yellow/red/black) .	white
RUNNING_DURATION_HOURS	The number of hours java-bullshifier app should be running	0
RUNNING_DURATION_MINUTES	The number of minutes java-bullshifier app should be running	5
INERVAL_MILLIS	Interval between events (millis)	300
GEN_SEED	(Optional) Numerical value used to seed random functions when generating Java Application
APP_SEED	(Optional) Numerical value used to seed random functions when running the generated application
TAKIPI_SERVER_NAME	Override the server name used by the agent	hostname joined with index
TAKIPI_APPLICATION_NAME	Override the application name used by the agent	tester or what is provided during gradle run with the name option
TAKIPI_DEPLOYMENT_NAME	Override the deployment name used by the agent	hostname joined with app name and deployment seed/process count
TAKIPI_ENV_ID	Set the environment name used by the agent	value of TAKIPI_SERVER_NAME