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VocBench System Administration Manual

This manual supports System Administrators in all task related to installation and maintenance of the tool, usually including tasks which cannot be performed by the VocBench Administrator through the UI

Other Installation Options

Separate Triple Store

VocBench (or better, its RDF Backend Semantic Turkey), comes with an embedded distribution of RDF4J, which includes a couple of storage solutions: in-memory store and native store. Creating local repositories with this embedded solution is very convenient for quickly playing with the platform without any additional installation.

However, to the purpose of having full control over your data, we recommed to adopt a separate triple store and connect to it remotely.

VocBench requires a triple store compliant with the RDF4J client API and, in order to support the more advanced features of the system such as history and validation, compliant with the RDF4J's Sail Stack mechanism.

Current available options are:

Using history & validation: deploying the change-tracking sail component in the connected triple store

If the history or validation functionalities are required for projects connected to the separate triple store, then the component of Semantic Turkey for tracking changes in the repositories has to be deployed inside the connected store.

The component, which is implemented as a sail layer for triple stores compliant with RDF4J's Sail Stack mechanism, is available as a jar file called st-changetracking-sail-<version>.jar, deployed inside the system/it/uniroma2/art/semanticturkey/st-changetracking-sail/<version> directory of Semantic Turkey.

This jar file has to be copied inside the lib directory of the connected triple store in order to enable the history validation functionalities.

Separate HTTP Server

The standalone distribution contains everything needed to start playing with the system. Depending on the system administrator preference, organization policies, load balance optimization etc..., it might be desired to separate the RDF services managed by Semantic Turkey from the VocBench Web Application. In particular, since the Web Application contains only static assets, any standard http server can be adopted.

The VocBench web application is available as a web archive (.war file) in the /deploy directory of the distribution, with name: vocbench3-<versionnumber>.war

In both cases, it might be necessary to have the VocBench web application explicitly pointing to the Semantic Turkey server, as explained in the following section.

Further Configuration for reaching Semantic Turkey on a different host/port

Note that the custom settings below are not possible when running VocBench from inside the Karaf container as in the standalone distribution. You might want to have VocBench installed as a separate web application in a dedicated server, as explained in the previous section

In vbconfis.js (under src/ of the source package, or under the root folder of the built distribution) it is possible to configure the SemanticTurkey host resolution. By default VocBench3 resolves the IP address of the SemanticTurkey server dynamically by using the same IP address of the VocBench host machine. This is determined by the configuration property dynamic_st_host_resolution (by default set to true).

/**   
 * Tells if the system should use the IP of the machine which is serving the VB3 content to query the ST server.   
 * N.B. This can be left to true only if VocBench3 and SemanticTurkey are running on the same machine,   
 * otherwise, set this to false and change the value of the st_host parameter   
 */  

var dynamic_st_host_resolution = true;  

In case VocBench3 and SemanticTurkey run on two different hosts, it is possible to provide the SemanticTurkey IP address statically by setting the previous property to false and modifying the property st_host with the address of the target host (the property st_host is ignored if dynamic_st_host_resolution is true).

var dynamic_st_host_resolution = false;  

/**   
 * IP address/logical host name of the machine which hosts SemanticTurkey.
 * Configure this parameter only if dynamic_st_host_resolution is set to false.   
 */  

var st_host = "127.0.0.1";  

It is also possible to change the port where SemanticTurkey is listening (the default is 1979) by changing st_port property.

/**   
  * Port where SemanticTurkey server is listening   
  */  

var st_port = "1979";  

Maintenance and Settings

VocBench allows Administrators and other authenticated users to perform most of the fine tuning of the system, through the UI of the platform. This section deals with all the hidden tricks and tunings which need to work under the hood