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What is ZOO-Kernel ?
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ZOO-Kernel is the heart of the ZOO-Project WPS platform. It is a WPS compliant implementation written in C language which provides a powerful and extensible WPS server.
ZOO-Kernel is an extensible WPS server that makes your system more powerful. It provides a full-featured processing engine which runs on Linux, Mac OSX |trade| and Windows |trade| operating systems. ZOO-Kernel is a CGI program which works on common web servers (namely Apache or IIS |trade|). It can be seamlessly integrated to new or existing web platforms.
ZOO-Kernel lets you process geospatial or non geospatial data using well formed WPS requests. The WPS server is able to manage and chain WPS Services (see ZOO-Services for examples) by loading dynamic libraries and source code written in different programming languages.
First class WPS server
Compliant
ZOO-Kernel implements and complies with the WPS 1.0.0 and the WPS 2.0.0 standards edited by the Open Geospatial Consortium. It is able to perform the WPS operations defined in the OpenGIS |reg| specification, such as:
- GetCapablities: Returns service-level metadata information.It provides the list of available processing services.
- DescribeProcess: Returns a description of a process, including its supported input and output.
- Execute: Launches computation and returns the output produced by a particular process.
- GetStatus: only available in WPS 2.0.0, it lets the client fetch the ongoing status of a running service.
- GetResult: only available in WPS 2.0.0, it lets the client fetch the final result of a running service.
- Dismiss: only available in WPS 2.0.0, it lets the client ask the server to stop a running service and remove any file it created.
ZOO-Kernel compliancy and performances can be tested using the following tools:
- cptesting
- WPS Test Suite provided by the OGC compliancy program
- XML responses validity can also be simply tested using XMLint.
Polyglot
ZOO-Kernel is a polyglot. The software is written in a valid form of multiple programming languages, which performs the same operations independent of the programming language used to compile or interpret it. The supported programming languages are listed bellow:
| Language | ServiceProvider | DataStructure | Return |
| C / C++ | Shared Library | maps* M | integer |
| Java | Class File | HashMap | integer |
| Python | Module File | Dictionary | integer |
| PHP | Script File | Array | integer |
| Perl | Script File | integer | |
| Ruby | Script File | Hash | integer |
| Fortran | Shared Library | CHARACTER*(1024) M(10,30) | integer |
| JavaScript | Script file | Object or Array | Object/Array |
Scalable
ZOO-Kernel can scale to large infrastructures involving high numbers of (concurrent) WPS requests and/or huge amounts of input/output.
