what.rst @ 873

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1	.. kernel-what:
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3	.. include:: <xhtml1-lat1.txt>
4	.. include:: <xhtml1-symbol.txt>
5
6	What is ZOO-Kernel ?
7	====================
8
9	ZOO-Kernel is the heart of the `ZOO-Project <http://zoo-project.org>`_ WPS platform. It is a WPS compliant implementation written in C language which provides a powerful and extensible WPS server.
10
11	ZOO-Kernel is an extensible WPS server that makes your system more
12	powerful. It provides a full-featured processing engine which runs on
13	Linux, Mac OSX \|trade\| and Windows \|trade\| operating
14	systems. ZOO-Kernel is a CGI program which works on common web servers
15	(namely `Apache <http://httpd.apache.org/>`_ or `IIS
16	<http://www.iis.net/>`_ \|trade\|). It can be seamlessly integrated to
17	new or existing web platforms.
18
19	ZOO-Kernel lets you process geospatial or non geospatial data using
20	well formed WPS requests. The WPS server is able to manage and chain
21	WPS Services (see ZOO-Services for examples) by loading dynamic
22	libraries and source code written in different programming languages.
23
24	First class WPS server
25	-----------------------
26
27	Simple
28	......
29
30	The ZOO-Kernel rely on simple principles and tends to ease the
31	implementation of new services by sharing similar data structures for
32	every supported programming languages. The ZOO-Kernel is responsible
33	to parse the requests it receives and return the corresponding WPS
34	response.
35
36	In case of an Execute request, the ZOO-Kernel stores informations in
37	a basic KVP data structure for the programming language used to
38	implement the service, dynamically load the Service Provider defined
39	in the zcfg file and run a specific function corresponding to the
40	service, passing three arguments. Once the function return, ZOO-Kernel
41	knows if the service run succeessfuly or failed by checking the
42	returned value. In the case it succeeded, the ZOO-Kernel then parse
43	the third arguments containing the result and produce the output in
44	the desired format.
45
46
47
48	Compliant
49	........................................................
50
51	ZOO-Kernel implements and complies with the `WPS 1.0.0
52	<http://www.opengeospatial.org/standards/wps/>`_ and the `WPS 2.0.0
53	<http://www.opengeospatial.org/standards/wps/>`_ standards edited by
54	the `Open Geospatial Consortium <http://www.opengeospatial.org/>`_. It
55	is able to perform the WPS operations defined in the OpenGIS \|reg\|
56	specification, such as:
57
58	* GetCapablities: Returns service-level metadata information.It
59	provides the list of available processing services.
60	* DescribeProcess: Returns a description of a process, including
61	its supported input and output.
62	* Execute: Launches computation and returns the output produced
63	by a particular process.
64	* GetStatus: only available in WPS 2.0.0, it lets the client fetch
65	the ongoing status of a running service.
66	* GetResult: only available in WPS 2.0.0, it lets the client fetch
67	the final result of a running service.
68	* Dismiss: only available in WPS 2.0.0, it lets the client ask
69	the server to stop a running service and remove any file it created.
70
71	ZOO-Kernel compliancy and performances can be tested using the
72	following tools:
73	* `cptesting <https://github.com/WPS-Benchmarking/cptesting>`_
74	* WPS Test Suite provided by the `OGC compliancy program <http://cite.opengeospatial.org/>`_
75	* XML responses validity can also be simply tested using `XMLint <http://xmlsoft.org/xmllint.html/>`_.
76
77	Polyglot
78	........................................................
79
80	ZOO-Kernel is a polyglot. The software is written in a valid form
81	of multiple programming languages, which performs the same operations
82	independent of the programming language used to compile or interpret
83	it. The supported programming languages are listed bellow:
84
85	============ =================== ========================= ============
86	Language ServiceProvider DataStructure Return
87	------------ ------------------- ------------------------- ------------
88	C / C++ Shared Library maps* M integer
89	Java Class File `HashMap`_ integer
90	Python Module File `Dictionary`_ integer
91	PHP Script File `Array`_ integer
92	Perl Script File integer
93	Ruby Script File `Hash`_ integer
94	Fortran Shared Library CHARACTER*(1024) M(10,30) integer
95	JavaScript Script file `Object`_ or Array Object/Array
96	============ =================== ========================= ============
97
98	.. _`HashMap`: http://download.oracle.com/javase/6/docs/api/java/util/HashMap.html
99	.. _`dictionary`: http://docs.python.org/tutorial/datastructures.html#dictionaries
100	.. _`Array`: http://php.net/manual/language.types.array.php
101	.. _`Object`: http://www.json.org/
102	.. _`Hash`: http://ruby-doc.org/core-2.2.0/Hash.html
103