A tutorial benchmark for ACM DEBS Grand Challenge 2017.
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ACM DEBS Grand Challenge tutorial system

The system implemented it this repository is able to pass DEBSParrotBenchmark. In order to do that it receives messages on inputQueue and sends all of them except TERMINATION_MESSAGE to outputQueue. Receiving of the TERMINATION_MESSAGE on inputQueue means no more followed messages. After the system has processed all the messages it must send TERMINATION_MESSAGE to outputQueue. The termination message is just a value of string "~~Termination Message~~" encoded to bytes with UTF-8.

Uploading system to the HOBBIT platform

In order to upload this system to the HOBBIT platfrom you need to do a few steps described below.

  1. Compile this code and build jar. Probably, the easiest way to do this is to execute corresponding Maven task of this project.
  2. Build Docker image. Put your jar file to the directory where you have Dockerfile. In my case, jar file is named debs-parrotbenchmark-system-1.0-SNAPSHOT.jar and located under [projcect root]/deploy directory. Navigate to that directory and execute the following command to buld Docker image: docker build -t git.project-hobbit.eu:4567/<user name>/<image name> . In my case the command is docker build -t git.project-hobbit.eu:4567/rkaterinenko/debsparrotsystemexample . Note! The last comma is required- it is path to your current directory.
  3. Upload the image to HOBBIT's gitlab. Login to gitlab: docker login git.project-hobbit.eu:4567 and upload: docker push git.project-hobbit.eu:4567/rkaterinenko/debsparrotsystemexample, in my case.
  4. Put system.ttl directly to the root of you gitlab project.

You may have different names or steps, but the result should be the same - docker image and system.ttl uploaded to HOBBIT's gitlab. These two artifacts are enough for the HOBBIT platform to instatiate and run your system. In this repository, under [projcect root]/deploy, you can find example files that I use. But you don't have to stick to them.

Running the system locally

If you need to run your system locally, then after you started HOBBIT platform and Rabbit MQ locally, you need to execute something like this: docker run --network="hobbit" --network="hobbit-core" --env-file ./env --name cont_name_debsparrotsystemexample git.project-hobbit.eu:4567/rkaterinenko/debsparrotsystemexample It mimicks what the platform does with your image when instantiates Docker container from it:

  • Attach to hobbit and hobbit-core networks
  • Supply environment variables (in this example from env file.)

Supply of that environment variables is platform responsibility. You don't have to supply them yourself. But if you want to run the system locally then you need to do that because system code checks for their existence. In this case you can specify any valid values to the mentioned environment variables.