MobSOS Query Visualization

MobSOS Query Visualization is a Web service for the interactive exploration and visualization of relational data sets. The exploration basically consists in authoring query visualizations that can be persisted, exported to written reports or published on Web sites. Authoring a query visualization consists in three simple steps:

1. selecting a data set,
2. formulating a query statement (usually in SQL) and
3. selecting a visualization type (e.g. pie or bar chart).

Optionally, query statements and visualizations can be parameterized and further described by meta data such as title or display dimensions.

Use

• You can try the service at https://las2peer.dbis.rwth-aachen.de/qv-service/.
• The wiki of this project features a tutorial with step-by-step instructions.
• A short description of the service's browser interface is available as separate help page.

Build

Before you build the project make sure you have set up a database.

mysql -u YOUR_USER -p -e 'CREATE DATABASE QVS;'
mysql -u YOUR_USER -p QVS < db.sql
mysql -u YOUR_USER -p -e "SET GLOBAL time_zone = '+00:00';"

Enter the credentials in the property file. The following values are important:

Property	Description
stDbKey	Default database key
stDbHost	Host for the connection
stDbPort	Port of the SQL Server
stDbDatabase	Name of the database
stDbUser	Login name
stDbPassword	Password

Execute the following command on your shell:

./gradlew clean build --info

Sometimes the tests would fail on the first run. try the above command again if that happened to you

Deploy

The start_network.bat script uses the L2PNodeLauncher class to start the service. It does also register the content of the "startup" directory and it starts the Web-Connector at port 8080.

For running the frontend server read #frontend

How to run using Docker

First build the image:

docker build . -t mobsos-query-visualization

Then you can run the image like this:

docker run -e MYSQL_USER=myuser -e MYSQL_PASSWORD=mypasswd -p 8080:8080 -p 9011:9011 mobsos-query-visualization

Replace myuser and mypasswd with the username and password of a MySQL user with access to a database named QVS. By default the database host is mysql and the port is 3306. The REST-API will be available via http://localhost:8080/QVS and the las2peer node is available via port 9011.

In order to customize your setup you can set further environment variables.

Node Launcher Variables

Set las2peer node launcher options with these variables. The las2peer port is fixed at 9011.

Variable	Default	Description
BOOTSTRAP	unset	Set the --bootstrap option to bootrap with existing nodes. The container will wait for any bootstrap node to be available before continuing.
SERVICE_PASSPHRASE	processing	Set the second argument in startService('service@version', '<SERVICE_PASSPHRASE>').
SERVICE_EXTRA_ARGS	unset	Set additional launcher arguments. Example: --observer to enable monitoring.

Service Variables

Variables for service configuration.

Variable	Default
MYSQL_USER	mandatory
MYSQL_PASSWORD	mandatory
MYSQL_HOST	mysql
MYSQL_PORT	3306
INIT_EXAMPLE_DATABASE	unset
MYSQL_EXAMPLE_USER	example
MYSQL_EXAMPLE_PASSWORD	example
MYSQL_EXAMPLE_HOST	mysql
MYSQL_EXAMPLE_PORT	3306

Web Connector Variables

Set WebConnector properties with these variables. httpPort and httpsPort are fixed at 8080 and 8443.

Variable	Default
START_HTTP	TRUE
START_HTTPS	FALSE
SSL_KEYSTORE	""
SSL_KEY_PASSWORD	""
CROSS_ORIGIN_RESOURCE_DOMAIN	*
CROSS_ORIGIN_RESOURCE_MAX_AGE	60
ENABLE_CROSS_ORIGIN_RESOURCE_SHARING	TRUE
OIDC_PROVIDERS	https://api.learning-layers.eu/o/oauth2,https://accounts.google.com

Other Variables

Variable	Default	Description
DEBUG	unset	Set to any value to get verbose output in the container entrypoint script.

Frontend

In your frontend, make sure to adjust the data-redirect attribute in the sign-in button of the frontend/demo.html file.

    data-redirect="http://localhost:5500/demo.html"

Also you need to change the data-clientid.

    data-clientid="localtestclient"

You also need to adjust the REST API endpoint. In frontend/js/queryviz.js,adjust the LASHOST variable to reflect the url on which your endpoint is reachable.

var LASHOST='http://127.0.0.1:8080/';

Then you can build and run the frontend server:

npm install
node index.js

Volumes

The following places should be persisted in volumes in productive scenarios:

Path	Description
/src/node-storage	Pastry P2P storage.
/src/etc/startup	Service agent key pair and passphrase.
/src/log	Log files.

Do not forget to persist you database data

Background

The original use case behind MobSOS QV was the exploration of MobSOS datasets for metrics explaining the success (or failure) of artifacts (i.e. services or tools) provided by a community information system (CIS). Any MobSOS data set comprises automatically collected, cleaned and metadata-enriched usage data as well as end-user-contributed survey data. The exploration of possible CIS success metrics is much more convenient and intuitive with the help of interactive query visualizations. Additional persistence of such query visualizations enables analysts to build up their own CIS success metric catalogues, to create dashboards showing query visualizations on real-time data and ultimately to compile MobSOS-style hierarchical CIS success models. CIS success metrics thereby serve as proxy indicators of certain CIS success factors. These factors in turn are assigned to one of six predefined and scientifically validated CIS success dimensions. The result is a CIS success model to be validated and refined over time to reflect a community's changing understanding of CIS success for given CIS artifacts. However, MobSOS QV quickly turned out to be a rather generic tool for query visualizations on arbitrary relational data sets. It has been used for creating dashboards on the evolution of different scientific or open-source developer communities.