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| 144 | <li>Creating your first ZOO Service</li> |
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| 155 | <div class="section" id="creating-your-first-zoo-service"> |
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| 156 | <span id="first-service"></span><h1><a class="toc-backref" href="#table-of-contents">Creating your first ZOO Service</a><a class="headerlink" href="#creating-your-first-zoo-service" title="Permalink to this headline">¶</a></h1> |
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| 157 | <div class="contents topic" id="table-of-contents"> |
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| 158 | <p class="topic-title first">Table of Contents</p> |
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| 159 | <ul class="simple"> |
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| 160 | <li><a class="reference internal" href="#creating-your-first-zoo-service" id="id5">Creating your first ZOO Service</a><ul> |
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| 161 | <li><a class="reference internal" href="#introduction" id="id6">Introduction</a></li> |
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| 162 | <li><a class="reference internal" href="#service-and-publication-process-overview" id="id7">Service and publication process overview</a></li> |
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| 163 | <li><a class="reference internal" href="#creating-your-first-zcfg-file" id="id8">Creating your first ZCFG file</a></li> |
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| 164 | <li><a class="reference internal" href="#test-requests" id="id9">Test requests</a><ul> |
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| 165 | <li><a class="reference internal" href="#test-the-getcapabilities-request" id="id10">Test the GetCapabilities request</a></li> |
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| 166 | <li><a class="reference internal" href="#test-the-describeprocess-request" id="id11">Test the DescribeProcess request</a></li> |
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| 167 | <li><a class="reference internal" href="#test-the-execute-request" id="id12">Test the Execute request</a></li> |
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| 168 | </ul> |
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| 169 | </li> |
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| 170 | <li><a class="reference internal" href="#implementing-the-python-service" id="id13">Implementing the Python Service</a><ul> |
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| 171 | <li><a class="reference internal" href="#general-principles" id="id14">General Principles</a></li> |
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| 172 | <li><a class="reference internal" href="#the-hello-service" id="id15">The Hello Service</a></li> |
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| 173 | </ul> |
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| 174 | </li> |
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| 175 | <li><a class="reference internal" href="#interracting-with-your-service-using-execute-requests" id="id16">Interracting with your service using Execute requests</a></li> |
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| 176 | <li><a class="reference internal" href="#conclusion" id="id17">Conclusion</a></li> |
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| 177 | </ul> |
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| 178 | </li> |
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| 179 | </ul> |
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| 180 | </div> |
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| 181 | <div class="section" id="introduction"> |
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| 182 | <h2><a class="toc-backref" href="#table-of-contents">Introduction</a><a class="headerlink" href="#introduction" title="Permalink to this headline">¶</a></h2> |
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| 183 | <p>In this part, you will create and publish a simple ZOO-Service named <code class="docutils literal"><span class="pre">Hello</span></code> which |
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| 184 | will simply return a hello message containing the input value provided. It will be usefull |
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| 185 | to present in deeper details general concept on how ZOO-Kernel works and handles |
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| 186 | Execute requests.</p> |
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| 187 | </div> |
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| 188 | <div class="section" id="service-and-publication-process-overview"> |
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| 189 | <h2><a class="toc-backref" href="#table-of-contents">Service and publication process overview</a><a class="headerlink" href="#service-and-publication-process-overview" title="Permalink to this headline">¶</a></h2> |
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| 190 | <p>Before starting developing a ZOO Service, you should remember that in |
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| 191 | ZOO-Project, a Service is a couple made of:</p> |
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| 192 | <blockquote> |
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| 193 | <div><ul class="simple"> |
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| 194 | <li>a metadata file: a ZOO Service Configuration File (ZCFG) containing metadata |
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| 195 | informations about a Service (providing informations about default / supported |
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| 196 | inputs and outputs for a Service)</li> |
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| 197 | <li>a Services Provider: it depends on the programming language used, but for Python it |
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| 198 | is a module and for JavaScript a script file.</li> |
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| 199 | </ul> |
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| 200 | </div></blockquote> |
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| 201 | <p>To publish your Service, which means make your ZOO Kernel aware of its presence, |
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| 202 | you should copy a ZCFG file in the directory where <code class="docutils literal"><span class="pre">zoo_loader.cgi</span></code> is located (in this workshop, <code class="docutils literal"><span class="pre">/usr/lib/cgi-bin</span></code>) or in any subdirectory.</p> |
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| 203 | <div class="admonition warning"> |
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| 204 | <p class="first admonition-title">Warning</p> |
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| 205 | <p class="last">only the ZCFG file is required for the Service to be considerate as |
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| 206 | available. So if you don’t get the Service Provider, obviously your Execute |
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| 207 | request will fail as we will discuss later.</p> |
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| 208 | </div> |
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| 209 | <p>Before publication, you should store your ongoing work, so you’ll start by |
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| 210 | creating a directory to store the files of your Services Provider:</p> |
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| 211 | <div class="highlight-none"><div class="highlight"><pre>mkdir -p /home/user/zoo-ws/ws_sp/cgi-env |
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| 212 | </pre></div> |
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| 213 | </div> |
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| 214 | <p>Once the ZCFG and the Python module are both ready, you can publish simply |
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| 215 | by copying the corresponding files in the same directory as the ZOO-Kernel.</p> |
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| 216 | </div> |
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| 217 | <div class="section" id="creating-your-first-zcfg-file"> |
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| 218 | <h2><a class="toc-backref" href="#table-of-contents">Creating your first ZCFG file</a><a class="headerlink" href="#creating-your-first-zcfg-file" title="Permalink to this headline">¶</a></h2> |
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| 219 | <p>You will start by creating the ZCFG file for the <code class="docutils literal"><span class="pre">Hello</span></code> Service. Edit the |
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| 220 | <code class="docutils literal"><span class="pre">/home/user/zoo-ws/ws_sp/cgi-env/Hello.zcfg</span></code> file |
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| 221 | and add the following content:</p> |
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| 222 | <div class="highlight-none"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1 |
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| 223 | 2 |
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| 224 | 3 |
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| 225 | 4 |
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| 226 | 5 |
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| 227 | 6 |
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| 228 | 7 |
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| 229 | 8 |
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| 230 | 9 |
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| 231 | 10 |
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| 232 | 11 |
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| 233 | 12 |
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| 234 | 13 |
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| 235 | 14 |
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| 236 | 15 |
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| 237 | 16 |
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| 238 | 17 |
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| 239 | 18 |
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| 240 | 19 |
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| 241 | 20 |
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| 242 | 21 |
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| 243 | 22 |
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| 244 | 23 |
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| 245 | 24 |
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| 246 | 25 |
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| 247 | 26 |
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| 248 | 27 |
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| 249 | 28</pre></div></td><td class="code"><div class="highlight"><pre>[Hello] |
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| 250 | Title = Return a hello message. |
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| 251 | Abstract = Create a welcome string. |
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| 252 | processVersion = 2 |
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| 253 | storeSupported = true |
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| 254 | statusSupported = true |
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| 255 | serviceProvider = test_service |
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| 256 | serviceType = Python |
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| 257 | <DataInputs> |
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| 258 | [name] |
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| 259 | Title = Input string |
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| 260 | Abstract = The string to insert in the hello message. |
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| 261 | minOccurs = 1 |
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| 262 | maxOccurs = 1 |
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| 263 | <LiteralData> |
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| 264 | dataType = string |
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| 265 | <Default /> |
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| 266 | </LiteralData> |
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| 267 | </DataInputs> |
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| 268 | <DataOutputs> |
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| 269 | [Result] |
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| 270 | Title = The resulting string |
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| 271 | Abstract = The hello message containing the input string |
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| 272 | <LiteralData> |
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| 273 | dataType = string |
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| 274 | <Default /> |
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| 275 | </LiteralData> |
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| 276 | </DataOutputs> |
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| 277 | </pre></div> |
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| 278 | </td></tr></table></div> |
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| 279 | <div class="admonition note"> |
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| 280 | <p class="first admonition-title">Note</p> |
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| 281 | <p class="last">the name of the ZCFG file and the name between braket (here <code class="docutils literal"><span class="pre">[Hello]</span></code>) |
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| 282 | should be the same and correspond to the function name you will define in your |
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| 283 | Services provider.</p> |
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| 284 | </div> |
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| 285 | <p>As you can see in the ZOO Service Configuration File presented above it is divided into |
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| 286 | three distinct sections:</p> |
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| 287 | <blockquote> |
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| 288 | <div><ol class="arabic simple"> |
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| 289 | <li>Main Metadata information (from line 2 to 8)</li> |
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| 290 | <li>List of Inputs metadata information (from 9 line to 19)</li> |
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| 291 | <li>List of Outputs metadata information (from line 20 to 28)</li> |
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| 292 | </ol> |
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| 293 | </div></blockquote> |
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| 294 | <p>You can get more informations about ZCFG from <a class="reference external" href="http://zoo-project.org/docs/services/zcfg-reference.html">the reference documentation</a>.</p> |
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| 295 | <p>If you copy the <code class="docutils literal"><span class="pre">Hello.zcfg</span></code> file in the same directory as your ZOO Kernel |
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| 296 | then you will be able to request for DescribeProcess using the <code class="docutils literal"><span class="pre">Hello</span></code> |
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| 297 | <code class="docutils literal"><span class="pre">Identifier</span></code>. The <code class="docutils literal"><span class="pre">Hello</span></code> service should also be listed from Capabilities |
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| 298 | document.</p> |
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| 299 | </div> |
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| 300 | <div class="section" id="test-requests"> |
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| 301 | <h2><a class="toc-backref" href="#table-of-contents">Test requests</a><a class="headerlink" href="#test-requests" title="Permalink to this headline">¶</a></h2> |
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| 302 | <p>In this section you will tests each WPS requests : GetCapabilities, |
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| 303 | DescribeProcess and Execute. Note that only GetCapabilities and DescribeProcess |
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| 304 | should work at this step.</p> |
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| 305 | <div class="section" id="test-the-getcapabilities-request"> |
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| 306 | <h3><a class="toc-backref" href="#table-of-contents">Test the GetCapabilities request</a><a class="headerlink" href="#test-the-getcapabilities-request" title="Permalink to this headline">¶</a></h3> |
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| 307 | <p>If you run the <code class="docutils literal"><span class="pre">GetCapabilities</span></code> request:</p> |
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| 308 | <div class="highlight-none"><div class="highlight"><pre>http://localhost/cgi-bin/zoo_loader.cgi?request=GetCapabilities&service=WPS |
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| 309 | </pre></div> |
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| 310 | </div> |
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| 311 | <p>Now, you should find your Hello Service in a <code class="docutils literal"><span class="pre">Process</span></code> node in |
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| 312 | <code class="docutils literal"><span class="pre">ProcessOfferings</span></code>:</p> |
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| 313 | <div class="highlight-xml"><div class="highlight"><pre><span class="nt"><wps:Process</span> <span class="na">wps:processVersion=</span><span class="s">"2"</span><span class="nt">></span> |
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| 314 | <span class="nt"><ows:Identifier></span>Hello<span class="nt"></ows:Identifier></span> |
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| 315 | <span class="nt"><ows:Title></span>Return a hello message.<span class="nt"></ows:Title></span> |
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| 316 | <span class="nt"><ows:Abstract></span>Create a welcome string.<span class="nt"></ows:Abstract></span> |
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| 317 | <span class="nt"></wps:Process></span> |
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| 318 | </pre></div> |
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| 319 | </div> |
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| 320 | </div> |
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| 321 | <div class="section" id="test-the-describeprocess-request"> |
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| 322 | <h3><a class="toc-backref" href="#table-of-contents">Test the DescribeProcess request</a><a class="headerlink" href="#test-the-describeprocess-request" title="Permalink to this headline">¶</a></h3> |
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| 323 | <p>You can access the <code class="docutils literal"><span class="pre">ProcessDescription</span></code> of the <code class="docutils literal"><span class="pre">Hello</span></code> service using the |
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| 324 | following <code class="docutils literal"><span class="pre">DescribeProcess</span></code> request:</p> |
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| 325 | <div class="highlight-none"><div class="highlight"><pre>http://localhost/cgi-bin/zoo_loader.cgi?request=DescribeProcess&service=WPS&version=1.0.0&Identifier=Hello |
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| 326 | </pre></div> |
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| 327 | </div> |
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| 328 | <p>You should get the following response:</p> |
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| 329 | <div class="highlight-xml"><div class="highlight"><pre><span class="nt"><wps:ProcessDescriptions</span> <span class="na">xmlns:ows=</span><span class="s">"http://www.opengis.net/ows/1.1"</span> <span class="na">xmlns:wps=</span><span class="s">"http://www.opengis.net/wps/1.0.0"</span> <span class="na">xmlns:xlink=</span><span class="s">"http://www.w3.org/1999/xlink"</span> <span class="na">xmlns:xsi=</span><span class="s">"http://www.w3.org/2001/XMLSchema-instance"</span> <span class="na">xsi:schemaLocation=</span><span class="s">"http://www.opengis.net/wps/1.0.0 http://schemas.opengis.net/wps/1.0.0/wpsDescribeProcess_response.xsd"</span> <span class="na">service=</span><span class="s">"WPS"</span> <span class="na">version=</span><span class="s">"1.0.0"</span> <span class="na">xml:lang=</span><span class="s">"en-US"</span><span class="nt">></span> |
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| 330 | <span class="nt"><ProcessDescription</span> <span class="na">wps:processVersion=</span><span class="s">"2"</span> <span class="na">storeSupported=</span><span class="s">"true"</span> <span class="na">statusSupported=</span><span class="s">"true"</span><span class="nt">></span> |
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| 331 | <span class="nt"><ows:Identifier></span>Hello<span class="nt"></ows:Identifier></span> |
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| 332 | <span class="nt"><ows:Title></span>Return a hello message.<span class="nt"></ows:Title></span> |
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| 333 | <span class="nt"><ows:Abstract></span>Create a welcome string.<span class="nt"></ows:Abstract></span> |
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| 334 | <span class="nt"><DataInputs></span> |
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| 335 | <span class="nt"><Input</span> <span class="na">minOccurs=</span><span class="s">"1"</span> <span class="na">maxOccurs=</span><span class="s">"1"</span><span class="nt">></span> |
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| 336 | <span class="nt"><ows:Identifier></span>name<span class="nt"></ows:Identifier></span> |
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| 337 | <span class="nt"><ows:Title></span>Input string<span class="nt"></ows:Title></span> |
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| 338 | <span class="nt"><ows:Abstract></span>The string to insert in the hello message.<span class="nt"></ows:Abstract></span> |
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| 339 | <span class="nt"><LiteralData></span> |
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| 340 | <span class="nt"><ows:DataType</span> <span class="na">ows:reference=</span><span class="s">"http://www.w3.org/TR/xmlschema-2/#string"</span><span class="nt">></span>string<span class="nt"></ows:DataType></span> |
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| 341 | <span class="nt"><ows:AnyValue/></span> |
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| 342 | <span class="nt"></LiteralData></span> |
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| 343 | <span class="nt"></Input></span> |
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| 344 | <span class="nt"></DataInputs></span> |
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| 345 | <span class="nt"><ProcessOutputs></span> |
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| 346 | <span class="nt"><Output></span> |
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| 347 | <span class="nt"><ows:Identifier></span>Result<span class="nt"></ows:Identifier></span> |
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| 348 | <span class="nt"><ows:Title></span>The resulting string<span class="nt"></ows:Title></span> |
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| 349 | <span class="nt"><ows:Abstract></span>The hello message containing the input string<span class="nt"></ows:Abstract></span> |
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| 350 | <span class="nt"><LiteralOutput></span> |
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| 351 | <span class="nt"><ows:DataType</span> <span class="na">ows:reference=</span><span class="s">"http://www.w3.org/TR/xmlschema-2/#string"</span><span class="nt">></span>string<span class="nt"></ows:DataType></span> |
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| 352 | <span class="nt"></LiteralOutput></span> |
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| 353 | <span class="nt"></Output></span> |
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| 354 | <span class="nt"></ProcessOutputs></span> |
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| 355 | <span class="nt"></ProcessDescription></span> |
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| 356 | <span class="nt"></wps:ProcessDescriptions></span> |
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| 357 | </pre></div> |
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| 358 | </div> |
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| 359 | </div> |
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| 360 | <div class="section" id="test-the-execute-request"> |
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| 361 | <h3><a class="toc-backref" href="#table-of-contents">Test the Execute request</a><a class="headerlink" href="#test-the-execute-request" title="Permalink to this headline">¶</a></h3> |
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| 362 | <p>Obviously, you cannot run your Service because the Python file was not published |
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| 363 | yet. If you try the following <code class="docutils literal"><span class="pre">Execute</span></code> request:</p> |
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| 364 | <div class="highlight-none"><div class="highlight"><pre>http://localhost/cgi-bin/zoo_loader.cgi?request=Execute&service=WPS&version=1.0.0&Identifier=Hello&DataInputs=name=toto |
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| 365 | </pre></div> |
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| 366 | </div> |
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| 367 | <p>You should get an ExceptionReport similar to the one provided in the following, |
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| 368 | which is normal behavior:</p> |
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| 369 | <div class="highlight-xml"><div class="highlight"><pre><span class="nt"><ows:ExceptionReport</span> <span class="na">xmlns:ows=</span><span class="s">"http://www.opengis.net/ows/1.1"</span> <span class="na">xmlns:xsi=</span><span class="s">"http://www.w3.org/2001/XMLSchema-instance"</span> <span class="na">xmlns:xlink=</span><span class="s">"http://www.w3.org/1999/xlink"</span> <span class="na">xsi:schemaLocation=</span><span class="s">"http://www.opengis.net/ows/1.1 http://schemas.opengis.net/ows/1.1.0/owsExceptionReport.xsd"</span> <span class="na">xml:lang=</span><span class="s">"en-US"</span> <span class="na">version=</span><span class="s">"1.1.0"</span><span class="nt">></span> |
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| 370 | <span class="nt"><ows:Exception</span> <span class="na">exceptionCode=</span><span class="s">"NoApplicableCode"</span><span class="nt">></span> |
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| 371 | <span class="nt"><ows:ExceptionText></span>Python module test_service cannot be loaded.<span class="nt"></ows:ExceptionText></span> |
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| 372 | <span class="nt"></ows:Exception></span> |
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| 373 | <span class="nt"></ows:ExceptionReport></span> |
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| 374 | </pre></div> |
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| 375 | </div> |
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| 376 | </div> |
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| 377 | </div> |
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| 378 | <div class="section" id="implementing-the-python-service"> |
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| 379 | <h2><a class="toc-backref" href="#table-of-contents">Implementing the Python Service</a><a class="headerlink" href="#implementing-the-python-service" title="Permalink to this headline">¶</a></h2> |
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| 380 | <div class="section" id="general-principles"> |
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| 381 | <h3><a class="toc-backref" href="#table-of-contents">General Principles</a><a class="headerlink" href="#general-principles" title="Permalink to this headline">¶</a></h3> |
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| 382 | <p>The most important thing you must know when implementing a new ZOO-Services |
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| 383 | using the Python language is that the function corresponding to your Service |
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| 384 | returns an integer value representing the status of execution |
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| 385 | (<code class="docutils literal"><span class="pre">SERVICE_FAILED</span></code> <a class="footnote-reference" href="#f1" id="id1">[1]</a> or <code class="docutils literal"><span class="pre">SERVICE_SUCCEEDED</span></code> <a class="footnote-reference" href="#f2" id="id2">[2]</a>) and takes three |
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| 386 | arguments (<a class="reference external" href="http://docs.python.org/tutorial/datastructures.html#dictionaries">Python dictionaries</a>):</p> |
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| 387 | <blockquote> |
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| 388 | <div><ul class="simple"> |
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| 389 | <li><code class="docutils literal"><span class="pre">conf</span></code> : the main environment configuration (corresponding to the main.cfg content)</li> |
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| 390 | <li><code class="docutils literal"><span class="pre">inputs</span></code> : the requested / default inputs (used to access input values)</li> |
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| 391 | <li><code class="docutils literal"><span class="pre">outputs</span></code> : the requested / default outputs (used to store computation result)</li> |
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| 392 | </ul> |
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| 393 | </div></blockquote> |
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| 394 | <div class="admonition note"> |
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| 395 | <p class="first admonition-title">Note</p> |
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| 396 | <p class="last">when your service return <code class="docutils literal"><span class="pre">SERVICE_FAILED</span></code> you can set |
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| 397 | <code class="docutils literal"><span class="pre">conf["lenv"]["message"]</span></code> to add a personalized message in the ExceptionReport |
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| 398 | returned by the ZOO Kernel in such case.</p> |
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| 399 | </div> |
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| 400 | <p>You get in the following a sample <code class="docutils literal"><span class="pre">conf</span></code> value based on the <code class="docutils literal"><span class="pre">main.cfg</span></code> file you |
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| 401 | saw <a class="reference external" href="using_zoo_from_osgeolivevm.html#zoo-kernel-configuration">before</a>.</p> |
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| 402 | <div class="highlight-javascript"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1 |
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| 403 | 2 |
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| 404 | 3 |
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| 405 | 4 |
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| 407 | 6 |
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| 408 | 7 |
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| 409 | 8 |
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| 411 | 10 |
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| 412 | 11 |
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| 413 | 12 |
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| 414 | 13 |
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| 415 | 14 |
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| 416 | 15 |
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| 417 | 16 |
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| 418 | 17 |
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| 419 | 18 |
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| 420 | 19 |
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| 421 | 20 |
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| 422 | 21 |
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| 423 | 22 |
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| 424 | 23 |
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| 425 | 24 |
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| 426 | 25 |
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| 427 | 26 |
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| 428 | 27 |
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| 429 | 28 |
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| 430 | 29 |
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| 431 | 30 |
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| 432 | 31 |
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| 433 | 32 |
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| 434 | 33</pre></div></td><td class="code"><div class="highlight"><pre><span class="p">{</span> |
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| 435 | <span class="s2">"main"</span><span class="o">:</span> <span class="p">{</span> |
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| 436 | <span class="nx">language</span><span class="o">:</span> <span class="s2">"en-US"</span><span class="p">,</span> |
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| 437 | <span class="nx">lang</span><span class="o">:</span> <span class="s2">"fr-FR,ja-JP"</span><span class="p">,</span> |
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| 438 | <span class="nx">version</span><span class="o">:</span> <span class="s2">"1.0.0"</span><span class="p">,</span> |
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| 439 | <span class="nx">encoding</span><span class="o">:</span> <span class="s2">"utf-8"</span><span class="p">,</span> |
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| 440 | <span class="nx">serverAddress</span><span class="o">:</span> <span class="s2">"http://localhost/cgi-bin/zoo_loader.cgi"</span><span class="p">,</span> |
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| 441 | <span class="nx">dataPath</span><span class="o">:</span> <span class="s2">"/var/data"</span><span class="p">,</span> |
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| 442 | <span class="nx">tmpPath</span><span class="o">:</span> <span class="s2">"/var/www/temp"</span><span class="p">,</span> |
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| 443 | <span class="nx">tmpUrl</span><span class="o">:</span> <span class="s2">"../temp"</span><span class="p">,</span> |
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| 444 | <span class="nx">cacheDir</span><span class="o">:</span> <span class="s2">"/var/www/temp/"</span> |
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| 445 | <span class="p">},</span> |
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| 446 | <span class="s2">"identification"</span><span class="o">:</span> <span class="p">{</span> |
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| 447 | <span class="nx">title</span><span class="o">:</span> <span class="s2">"ZOO-Project Workshop - FOSS4G 2014"</span><span class="p">,</span> |
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| 448 | <span class="nx">keywords</span><span class="o">:</span> <span class="s2">"WPS,GIS,buffer"</span><span class="p">,</span> |
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| 449 | <span class="kr">abstract</span><span class="o">:</span> <span class="s2">"Deploying Web Processing Services using ZOO-Project – Examples of Python based WPS using PgRouting"</span><span class="p">,</span> |
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| 450 | <span class="nx">accessConstraints</span><span class="o">:</span> <span class="s2">"none"</span><span class="p">,</span> |
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| 451 | <span class="nx">fees</span><span class="o">:</span> <span class="s2">"None"</span> |
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| 452 | <span class="p">},</span> |
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| 453 | <span class="s2">"provider"</span><span class="o">:</span> <span class="p">{</span> |
---|
| 454 | <span class="nx">positionName</span><span class="o">:</span> <span class="s2">"Developer"</span><span class="p">,</span> |
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| 455 | <span class="nx">providerName</span><span class="o">:</span> <span class="s2">"ZOO-Project"</span><span class="p">,</span> |
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| 456 | <span class="nx">addressAdministrativeArea</span><span class="o">:</span> <span class="s2">"Lattes"</span><span class="p">,</span> |
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| 457 | <span class="nx">addressCountry</span><span class="o">:</span> <span class="s2">"fr"</span><span class="p">,</span> |
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| 458 | <span class="nx">phoneVoice</span><span class="o">:</span> <span class="s2">"False"</span><span class="p">,</span> |
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| 459 | <span class="nx">addressPostalCode</span><span class="o">:</span> <span class="s2">"34970"</span><span class="p">,</span> |
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| 460 | <span class="nx">role</span><span class="o">:</span> <span class="s2">"Dev"</span><span class="p">,</span> |
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| 461 | <span class="nx">providerSite</span><span class="o">:</span> <span class="s2">"http://www.zoo-project.org"</span><span class="p">,</span> |
---|
| 462 | <span class="nx">phoneFacsimile</span><span class="o">:</span> <span class="s2">"False"</span><span class="p">,</span> |
---|
| 463 | <span class="nx">addressElectronicMailAddress</span><span class="o">:</span> <span class="s2">"gerald.fenoy@geolabs.fr"</span><span class="p">,</span> |
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| 464 | <span class="nx">addressCity</span><span class="o">:</span> <span class="s2">"Denver"</span><span class="p">,</span> |
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| 465 | <span class="nx">individualName</span><span class="o">:</span> <span class="s2">"Gérald FENOY"</span> |
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| 466 | <span class="p">}</span> |
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| 467 | </pre></div> |
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| 468 | </td></tr></table></div> |
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| 469 | <p>In the following you get a sample outputs value passed to a Python or a JavaScript Service:</p> |
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| 470 | <div class="highlight-javascript"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre>1 |
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| 471 | 2 |
---|
| 472 | 3 |
---|
| 473 | 4 |
---|
| 474 | 5 |
---|
| 475 | 6 |
---|
| 476 | 7</pre></div></td><td class="code"><div class="highlight"><pre><span class="p">{</span> |
---|
| 477 | <span class="s1">'Result'</span><span class="o">:</span> <span class="p">{</span> |
---|
| 478 | <span class="s1">'mimeType'</span><span class="o">:</span> <span class="s1">'application/json'</span><span class="p">,</span> |
---|
| 479 | <span class="s1">'inRequest'</span><span class="o">:</span> <span class="s1">'true'</span><span class="p">,</span> |
---|
| 480 | <span class="s1">'encoding'</span><span class="o">:</span> <span class="s1">'UTF-8'</span> |
---|
| 481 | <span class="p">}</span> |
---|
| 482 | <span class="p">}</span> |
---|
| 483 | </pre></div> |
---|
| 484 | </td></tr></table></div> |
---|
| 485 | <div class="admonition note"> |
---|
| 486 | <p class="first admonition-title">Note</p> |
---|
| 487 | <p class="last">the <code class="docutils literal"><span class="pre">inRequest</span></code> value is set internally by the ZOO-Kernel and can be used to determine from the Service if the key was provided in the request.</p> |
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| 488 | </div> |
---|
| 489 | <p>ZOO-Project provide a ZOO-API which was originally only available for |
---|
| 490 | JavaScript services, but thanks to the work of the ZOO-Project |
---|
| 491 | community, now you have also access to a ZOO-API when using |
---|
| 492 | the Python language. Thanks to the Python ZOO-API you don’t have to remember anymore |
---|
| 493 | the value of SERVICE_SUCCEDED and SERVICE_FAILED, you |
---|
| 494 | have the capability to translate any string from your Python service |
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| 495 | by calling the <code class="docutils literal"><span class="pre">_</span></code> function (ie: <code class="docutils literal"><span class="pre">zoo._('My</span> <span class="pre">string</span> <span class="pre">to</span> |
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| 496 | <span class="pre">translate')</span></code>) or to update the current status of a running service by |
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| 497 | using the <code class="docutils literal"><span class="pre">update_status</span></code> <a class="footnote-reference" href="#f4" id="id3">[3]</a> function the same way you use it from |
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| 498 | JavaScript or C services.</p> |
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| 499 | </div> |
---|
| 500 | <div class="section" id="the-hello-service"> |
---|
| 501 | <h3><a class="toc-backref" href="#table-of-contents">The Hello Service</a><a class="headerlink" href="#the-hello-service" title="Permalink to this headline">¶</a></h3> |
---|
| 502 | <p>You can copy and paste the following into the |
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| 503 | <code class="docutils literal"><span class="pre">/home/user/zoo-ws/ws_sp/cgi-env/test_service.py</span></code> file.</p> |
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| 504 | <div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">zoo</span> |
---|
| 505 | <span class="k">def</span> <span class="nf">Hello</span><span class="p">(</span><span class="n">conf</span><span class="p">,</span><span class="n">inputs</span><span class="p">,</span><span class="n">outputs</span><span class="p">):</span> |
---|
| 506 | <span class="n">outputs</span><span class="p">[</span><span class="s">"Result"</span><span class="p">][</span><span class="s">"value"</span><span class="p">]</span><span class="o">=</span>\ |
---|
| 507 | <span class="s">"Hello "</span><span class="o">+</span><span class="n">inputs</span><span class="p">[</span><span class="s">"name"</span><span class="p">][</span><span class="s">"value"</span><span class="p">]</span><span class="o">+</span><span class="s">" from the ZOO-Project Python world !"</span> |
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| 508 | <span class="k">return</span> <span class="n">zoo</span><span class="o">.</span><span class="n">SERVICE_SUCCEEDED</span> |
---|
| 509 | </pre></div> |
---|
| 510 | </div> |
---|
| 511 | <p>Once you finish editing the file, you should copy it in the <code class="docutils literal"><span class="pre">/usr/lib/cgi-bin</span></code> directory:</p> |
---|
| 512 | <div class="highlight-none"><div class="highlight"><pre>sudo cp /home/user/zoo-ws/ws_sp/cgi-env/* /usr/lib/cgi-bin |
---|
| 513 | </pre></div> |
---|
| 514 | </div> |
---|
| 515 | </div> |
---|
| 516 | </div> |
---|
| 517 | <div class="section" id="interracting-with-your-service-using-execute-requests"> |
---|
| 518 | <h2><a class="toc-backref" href="#table-of-contents">Interracting with your service using Execute requests</a><a class="headerlink" href="#interracting-with-your-service-using-execute-requests" title="Permalink to this headline">¶</a></h2> |
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| 519 | <p>Now, you can request for Execute using the following basic url:</p> |
---|
| 520 | <div class="highlight-none"><div class="highlight"><pre>http://localhost/cgi-bin/zoo_loader.cgi?request=Execute&service=WPS&version=1.0.0&Identifier=Hello&DataInputs=name=toto |
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| 521 | </pre></div> |
---|
| 522 | </div> |
---|
| 523 | <p>You can request the WPS Server to return a XML WPS Response containing the result of |
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| 524 | your computation, requesting for ResponseDocument or you can access the data directly |
---|
| 525 | requesting for RawDataOutput.</p> |
---|
| 526 | <ul class="simple"> |
---|
| 527 | <li>Sample request using the RawDataOutput parameter:</li> |
---|
| 528 | </ul> |
---|
| 529 | <div class="highlight-none"><div class="highlight"><pre>http://localhost/cgi-bin/zoo_loader.cgi?request=Execute&service=WPS&version=1.0.0&Identifier=Hello&DataInputs=name=toto&RawDataOutput=Result |
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| 530 | </pre></div> |
---|
| 531 | </div> |
---|
| 532 | <ul class="simple"> |
---|
| 533 | <li>Sample request using the default ResponseDocument parameter:</li> |
---|
| 534 | </ul> |
---|
| 535 | <div class="highlight-none"><div class="highlight"><pre>http://localhost/cgi-bin/zoo_loader.cgi?request=Execute&service=WPS&version=1.0.0&Identifier=Hello&DataInputs=name=toto&ResponseDocument=Result |
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| 536 | </pre></div> |
---|
| 537 | </div> |
---|
| 538 | <p>When you are using ResponseDocument there is specific attribut you can use to ask |
---|
| 539 | the ZOO Kernel to store the result: <code class="docutils literal"><span class="pre">asReference</span></code>. You can use the following example:</p> |
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| 540 | <div class="highlight-none"><div class="highlight"><pre>http://localhost/cgi-bin/zoo_loader.cgi?request=Execute&service=WPS&version=1.0.0&Identifier=Hello&DataInputs=name=toto&ResponseDocument=Result@asReference=true |
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| 541 | </pre></div> |
---|
| 542 | </div> |
---|
| 543 | <p>When computation take long time, the client should request the |
---|
| 544 | execution of a Service by setting both <code class="docutils literal"><span class="pre">storeExecuteResponse</span></code> and |
---|
| 545 | <code class="docutils literal"><span class="pre">status</span></code> parameter to true to force asynchronous execution. This |
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| 546 | will make the ZOO-Kernel return, without waiting for the Service execution |
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| 547 | completion but after starting another ZOO-Kernel process responsible |
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| 548 | of the Service execution, a ResponseDocument containing a <code class="docutils literal"><span class="pre">statusLocation</span></code> |
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| 549 | attribute which can be used to access the status of an ongoing service |
---|
| 550 | or the result when the process ended <a class="footnote-reference" href="#f3" id="id4">[4]</a>.</p> |
---|
| 551 | <div class="highlight-none"><div class="highlight"><pre>http://localhost/cgi-bin/zoo_loader.cgi?request=Execute&service=WPS&version=1.0.0&Identifier=Hello&DataInputs=name=toto&ResponseDocument=Result&storeExecuteResponse=true&status=true |
---|
| 552 | </pre></div> |
---|
| 553 | </div> |
---|
| 554 | </div> |
---|
| 555 | <div class="section" id="conclusion"> |
---|
| 556 | <h2><a class="toc-backref" href="#table-of-contents">Conclusion</a><a class="headerlink" href="#conclusion" title="Permalink to this headline">¶</a></h2> |
---|
| 557 | <p>Even if this first service was really simple it was useful to illustrate how the |
---|
| 558 | ZOO-Kernel fill <code class="docutils literal"><span class="pre">conf</span></code>, <code class="docutils literal"><span class="pre">inputs</span></code> and <code class="docutils literal"><span class="pre">outputs</span></code> parameter prior to load |
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| 559 | and run your function service, how to write a ZCFG file, how to publish a Services |
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| 560 | Provider by placing the ZCFG and Python files in the same directory as the |
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| 561 | ZOO-Kernel, then how to interract with your service using both |
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| 562 | <code class="docutils literal"><span class="pre">GetCapabilities</span></code>, <code class="docutils literal"><span class="pre">DescribeProcess</span></code> and <code class="docutils literal"><span class="pre">Execute</span></code> requests. We will see |
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| 563 | in the <a class="reference external" href="building_blocks_presentation.html">next section</a> how to write similar requests |
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| 564 | using the XML syntax.</p> |
---|
| 565 | <p class="rubric">Footnotes</p> |
---|
| 566 | <table class="docutils footnote" frame="void" id="f1" rules="none"> |
---|
| 567 | <colgroup><col class="label" /><col /></colgroup> |
---|
| 568 | <tbody valign="top"> |
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| 569 | <tr><td class="label"><a class="fn-backref" href="#id1">[1]</a></td><td><code class="docutils literal"><span class="pre">SERVICE_FAILED=4</span></code></td></tr> |
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| 570 | </tbody> |
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| 571 | </table> |
---|
| 572 | <table class="docutils footnote" frame="void" id="f2" rules="none"> |
---|
| 573 | <colgroup><col class="label" /><col /></colgroup> |
---|
| 574 | <tbody valign="top"> |
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| 575 | <tr><td class="label"><a class="fn-backref" href="#id2">[2]</a></td><td><code class="docutils literal"><span class="pre">SERVICE_SUCCEEDED=3</span></code></td></tr> |
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| 576 | </tbody> |
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| 577 | </table> |
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| 578 | <table class="docutils footnote" frame="void" id="f4" rules="none"> |
---|
| 579 | <colgroup><col class="label" /><col /></colgroup> |
---|
| 580 | <tbody valign="top"> |
---|
| 581 | <tr><td class="label"><a class="fn-backref" href="#id3">[3]</a></td><td>sample use of update_status is available <a class="reference external" href="http://zoo-project.org/trac/browser/trunk/zoo-project/zoo-services/utils/status/cgi-env/service.py#L1">here</a></td></tr> |
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| 582 | </tbody> |
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| 583 | </table> |
---|
| 584 | <table class="docutils footnote" frame="void" id="f3" rules="none"> |
---|
| 585 | <colgroup><col class="label" /><col /></colgroup> |
---|
| 586 | <tbody valign="top"> |
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| 587 | <tr><td class="label"><a class="fn-backref" href="#id4">[4]</a></td><td>To get on-going status url in <code class="docutils literal"><span class="pre">statusLocation</span></code>, you’ll |
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| 588 | need to setup the <a class="reference external" href="http://www.zoo-project.org/trac/browser/trunk/zoo-project/zoo-services/utils/status">utils/status</a> |
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| 589 | Service. If you don’t get this service available, the ZOO-Kernel will |
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| 590 | simply give the url to a flat XML file stored on the server which will |
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| 591 | contain, at the end of the execution, the result of the Service |
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| 592 | execution. For more informations please take a look into the |
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| 593 | reference <a class="reference external" href="http://zoo-project.org/docs/services/status.html">documentation</a>.</td></tr> |
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| 594 | </tbody> |
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| 595 | </table> |
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| 596 | </div> |
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| 597 | </div> |
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| 598 | |
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| 599 | |
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| 600 | </div> |
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| 601 | <footer> |
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| 603 | |
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| 604 | <hr/> |
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| 605 | <div class="pfoot"> |
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| 606 | <div role="contentinfo"> |
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| 607 | <p> |
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| 608 | © Copyright 2009-2015, ZOO-Project team. |
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| 609 | </p> |
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| 610 | </div> |
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| 611 | Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a <a href="https://github.com/snide/sphinx_rtd_theme">theme</a> inspired by <a href="https://readthedocs.org">Read the Docs</a>. |
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| 612 | </div> |
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| 613 | </footer> |
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| 615 | </div> |
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| 616 | </div> |
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| 617 | |
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| 618 | </section> |
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| 620 | </div> |
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| 628 | URL_ROOT:'../../', |
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| 630 | COLLAPSE_INDEX:false, |
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| 631 | FILE_SUFFIX:'.html', |
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| 632 | HAS_SOURCE: true |
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| 633 | }; |
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| 634 | </script> |
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| 635 | <script type="text/javascript" src="../../_static/jquery.js"></script> |
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| 649 | jQuery(function () { |
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| 650 | SphinxRtdTheme.StickyNav.enable(); |
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| 655 | </body> |
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| 656 | </html> |
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