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Posted to commits@zeppelin.apache.org by zj...@apache.org on 2020/12/24 14:36:06 UTC
svn commit: r1884775 [14/49] - in /zeppelin/site/docs: 0.9.0-SNAPSHOT/
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URL: http://svn.apache.org/viewvc/zeppelin/site/docs/0.9.0/interpreter/geode.html?rev=1884775&view=auto
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+ <title>Apache Zeppelin 0.9.0 Documentation: Geode/Gemfire OQL Interpreter for Apache Zeppelin</title>
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+ <a href="#" data-toggle="dropdown" class="dropdown-toggle">Setup<b class="caret"></b></a>
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+ <li>
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+ <li class="title"><span>Interpreters</span></li>
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+ <li><a href="/docs/0.9.0/interpreter/groovy.html">Groovy</a></li>
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+ <li><a href="/docs/0.9.0/interpreter/pig.html">Pig</a></li>
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+ <li><a href="/docs/0.9.0/interpreter/scalding.html">Scalding</a></li>
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+ <li><a href="/docs/0.9.0/interpreter/shell.html">Shell</a></li>
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+ <li><a href="/docs/0.9.0/interpreter/submarine.html">Submarine</a></li>
+ </ul>
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+ <a href="#" data-toggle="dropdown" class="dropdown-toggle">More<b class="caret"></b></a>
+ <ul class="dropdown-menu scrollable-menu" style="right: 0; left: auto;">
+ <li class="title"><span>Extending Zeppelin</span></li>
+ <li><a href="/docs/0.9.0/development/writing_zeppelin_interpreter.html">Writing Zeppelin Interpreter</a></li>
+ <li role="separator" class="divider"></li>
+ <li class="title"><span>Helium (Experimental)</span></li>
+ <li><a href="/docs/0.9.0/development/helium/overview.html">Overview</a></li>
+ <li><a href="/docs/0.9.0/development/helium/writing_application.html">Writing Helium Application</a></li>
+ <li><a href="/docs/0.9.0/development/helium/writing_spell.html">Writing Helium Spell</a></li>
+ <li><a href="/docs/0.9.0/development/helium/writing_visualization_basic.html">Writing Helium Visualization: Basics</a></li>
+ <li><a href="/docs/0.9.0/development/helium/writing_visualization_transformation.html">Writing Helium Visualization: Transformation</a></li>
+ <li role="separator" class="divider"></li>
+ <li class="title"><span>Contributing to Zeppelin</span></li>
+ <li><a href="/docs/0.9.0/setup/basics/how_to_build.html">How to Build Zeppelin</a></li>
+ <li><a href="/docs/0.9.0/development/contribution/useful_developer_tools.html">Useful Developer Tools</a></li>
+ <li><a href="/docs/0.9.0/development/contribution/how_to_contribute_code.html">How to Contribute (code)</a></li>
+ <li><a href="/docs/0.9.0/development/contribution/how_to_contribute_website.html">How to Contribute (website)</a></li>
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+ <li class="title"><span>External Resources</span></li>
+ <li><a target="_blank" href="https://zeppelin.apache.org/community.html">Mailing List</a></li>
+ <li><a target="_blank" href="https://cwiki.apache.org/confluence/display/ZEPPELIN/Zeppelin+Home">Apache Zeppelin Wiki</a></li>
+ <li><a target="_blank" href="http://stackoverflow.com/questions/tagged/apache-zeppelin">Stackoverflow Questions about Zeppelin</a></li>
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+ </div>
+
+
+
+ <div class="content">
+
+<!--<div class="hero-unit Geode/Gemfire OQL Interpreter for Apache Zeppelin">
+ <h1></h1>
+</div>
+-->
+
+<div class="row">
+ <div class="col-md-12">
+ <!--
+Licensed under the Apache License, Version 2.0 (the "License");
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+
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+
+Unless required by applicable law or agreed to in writing, software
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+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
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+-->
+
+<h1>Geode/Gemfire OQL Interpreter for Apache Zeppelin</h1>
+
+<div id="toc"></div>
+
+<h2>Overview</h2>
+
+<table class="table-configuration">
+ <tr>
+ <th>Name</th>
+ <th>Class</th>
+ <th>Description</th>
+ </tr>
+ <tr>
+ <td>%geode.oql</td>
+ <td>GeodeOqlInterpreter</td>
+ <td>Provides OQL environment for Apache Geode</td>
+ </tr>
+</table>
+
+<p>This interpreter supports the <a href="http://geode.incubator.apache.org/">Geode</a> <a href="http://geode-docs.cfapps.io/docs/developing/querying_basics/oql_compared_to_sql.html">Object Query Language (OQL)</a>.<br>
+With the OQL-based querying language:</p>
+
+<p><a href="https://www.youtube.com/watch?v=zvzzA9GXu3Q"><img align="right" src="http://img.youtube.com/vi/zvzzA9GXu3Q/3.jpg" alt="zeppelin-view" hspace="10" width="200"></img></a></p>
+
+<ul>
+<li>You can query on any arbitrary object</li>
+<li>You can navigate object collections</li>
+<li>You can invoke methods and access the behavior of objects</li>
+<li>Data mapping is supported</li>
+<li>You are not required to declare types. Since you do not need type definitions, you can work across multiple languages</li>
+<li>You are not constrained by a schema</li>
+</ul>
+
+<p>This <a href="https://www.youtube.com/watch?v=zvzzA9GXu3Q">Video Tutorial</a> illustrates some of the features provided by the <code>Geode Interpreter</code>.</p>
+
+<h2>Create Interpreter</h2>
+
+<p>By default Zeppelin creates one <code>Geode/OQL</code> instance. You can remove it or create more instances.</p>
+
+<p>Multiple Geode instances can be created, each configured to the same or different backend Geode cluster.
+But over time a <code>Notebook</code> can have only one Geode interpreter instance <code>bound</code>.
+That means you <em>cannot</em> connect to different Geode clusters in the same <code>Notebook</code>.
+This is a known Zeppelin limitation.</p>
+
+<p>To create new Geode instance open the <code>Interpreter</code> section and click the <code>+Create</code> button.
+Pick a <code>Name</code> of your choice and from the <code>Interpreter</code> drop-down select <code>geode</code>.<br>
+Then follow the configuration instructions and <code>Save</code> the new instance.</p>
+
+<blockquote>
+<p>Note: The <code>Name</code> of the instance is used only to distinguish the instances while binding them to the <code>Notebook</code>. The <code>Name</code> is irrelevant inside the <code>Notebook</code>. In the <code>Notebook</code> you must use <code>%geode.oql</code> tag.</p>
+</blockquote>
+
+<h2>Bind to Notebook</h2>
+
+<p>In the <code>Notebook</code> click on the <code>settings</code> icon in the top right corner.
+The select/deselect the interpreters to be bound with the <code>Notebook</code>.</p>
+
+<h2>Configuration</h2>
+
+<p>You can modify the configuration of the Geode from the <code>Interpreter</code> section.
+The Geode interpreter expresses the following properties:</p>
+
+<table class="table-configuration">
+ <tr>
+ <th>Property Name</th>
+ <th>Description</th>
+ <th>Default Value</th>
+ </tr>
+ <tr>
+ <td>geode.locator.host</td>
+ <td>The Geode Locator Host</td>
+ <td>localhost</td>
+ </tr>
+ <tr>
+ <td>geode.locator.port</td>
+ <td>The Geode Locator Port</td>
+ <td>10334</td>
+ </tr>
+ <tr>
+ <td>geode.max.result</td>
+ <td>Max number of OQL result to display to prevent the browser overload</td>
+ <td>1000</td>
+ </tr>
+</table>
+
+<h2>How to use</h2>
+
+<blockquote>
+<p><em>Tip 1: Use (CTRL + .) for OQL auto-completion.</em></p>
+
+<p><em>Tip 2: Always start the paragraphs with the full <code>%geode.oql</code> prefix tag! The short notation: <code>%geode</code> would still be able run the OQL queries but the syntax highlighting and the auto-completions will be disabled.</em></p>
+</blockquote>
+
+<h3>Create / Destroy Regions</h3>
+
+<p>The OQL specification does not support <a href="https://cwiki.apache.org/confluence/display/GEODE/Index#Index-MainConceptsandComponents">Geode Regions</a> mutation operations.
+To <code>create</code>/<code>destroy</code> regions one should use the <a href="http://geode-docs.cfapps.io/docs/tools_modules/gfsh/chapter_overview.html">GFSH</a> shell tool instead.
+In the following it is assumed that the GFSH is colocated with Zeppelin server.</p>
+<div class="highlight"><pre><code class="bash language-bash" data-lang="bash">%sh
+<span class="nb">source</span> /etc/geode/conf/geode-env.sh
+gfsh <span class="s"><< EOF</span>
+
+<span class="s"> connect --locator=ambari.localdomain[10334]</span>
+
+<span class="s"> destroy region --name=/regionEmployee</span>
+<span class="s"> destroy region --name=/regionCompany</span>
+<span class="s"> create region --name=regionEmployee --type=REPLICATE</span>
+<span class="s"> create region --name=regionCompany --type=REPLICATE</span>
+
+<span class="s"> exit;</span>
+<span class="s">EOF</span>
+</code></pre></div>
+<p>Above snippet re-creates two regions: <code>regionEmployee</code> and <code>regionCompany</code>.
+Note that you have to explicitly specify the locator host and port.
+The values should match those you have used in the Geode Interpreter configuration.
+Comprehensive list of <a href="http://geode-docs.cfapps.io/docs/tools_modules/gfsh/gfsh_quick_reference.html">GFSH Commands by Functional Area</a>.</p>
+
+<h3>Basic OQL</h3>
+<div class="highlight"><pre><code class="sql language-sql" data-lang="sql"><span class="o">%</span><span class="n">geode</span><span class="p">.</span><span class="n">oql</span>
+<span class="k">SELECT</span> <span class="k">count</span><span class="p">(</span><span class="o">*</span><span class="p">)</span> <span class="k">FROM</span> <span class="o">/</span><span class="n">regionEmployee</span>
+</code></pre></div>
+<p>OQL <code>IN</code> and <code>SET</code> filters:</p>
+<div class="highlight"><pre><code class="sql language-sql" data-lang="sql"><span class="o">%</span><span class="n">geode</span><span class="p">.</span><span class="n">oql</span>
+<span class="k">SELECT</span> <span class="o">*</span> <span class="k">FROM</span> <span class="o">/</span><span class="n">regionEmployee</span>
+<span class="k">WHERE</span> <span class="n">companyId</span> <span class="k">IN</span> <span class="k">SET</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span> <span class="k">OR</span> <span class="n">lastName</span> <span class="k">IN</span> <span class="k">SET</span><span class="p">(</span><span class="s1">'Tzolov13'</span><span class="p">,</span> <span class="s1">'Tzolov73'</span><span class="p">)</span>
+</code></pre></div>
+<p>OQL <code>JOIN</code> operations</p>
+<div class="highlight"><pre><code class="sql language-sql" data-lang="sql"><span class="o">%</span><span class="n">geode</span><span class="p">.</span><span class="n">oql</span>
+<span class="k">SELECT</span> <span class="n">e</span><span class="p">.</span><span class="n">employeeId</span><span class="p">,</span> <span class="n">e</span><span class="p">.</span><span class="n">firstName</span><span class="p">,</span> <span class="n">e</span><span class="p">.</span><span class="n">lastName</span><span class="p">,</span> <span class="k">c</span><span class="p">.</span><span class="n">id</span> <span class="k">as</span> <span class="n">companyId</span><span class="p">,</span> <span class="k">c</span><span class="p">.</span><span class="n">companyName</span><span class="p">,</span> <span class="k">c</span><span class="p">.</span><span class="n">address</span>
+<span class="k">FROM</span> <span class="o">/</span><span class="n">regionEmployee</span> <span class="n">e</span><span class="p">,</span> <span class="o">/</span><span class="n">regionCompany</span> <span class="k">c</span>
+<span class="k">WHERE</span> <span class="n">e</span><span class="p">.</span><span class="n">companyId</span> <span class="o">=</span> <span class="k">c</span><span class="p">.</span><span class="n">id</span>
+</code></pre></div>
+<p>By default the QOL responses contain only the region entry values. To access the keys, query the <code>EntrySet</code> instead:</p>
+<div class="highlight"><pre><code class="sql language-sql" data-lang="sql"><span class="o">%</span><span class="n">geode</span><span class="p">.</span><span class="n">oql</span>
+<span class="k">SELECT</span> <span class="n">e</span><span class="p">.</span><span class="k">key</span><span class="p">,</span> <span class="n">e</span><span class="p">.</span><span class="n">value</span><span class="p">.</span><span class="n">companyId</span><span class="p">,</span> <span class="n">e</span><span class="p">.</span><span class="n">value</span><span class="p">.</span><span class="n">email</span>
+<span class="k">FROM</span> <span class="o">/</span><span class="n">regionEmployee</span><span class="p">.</span><span class="n">entrySet</span> <span class="n">e</span>
+</code></pre></div>
+<p>Following query will return the EntrySet value as a Blob:</p>
+<div class="highlight"><pre><code class="sql language-sql" data-lang="sql"><span class="o">%</span><span class="n">geode</span><span class="p">.</span><span class="n">oql</span>
+<span class="k">SELECT</span> <span class="n">e</span><span class="p">.</span><span class="k">key</span><span class="p">,</span> <span class="n">e</span><span class="p">.</span><span class="n">value</span> <span class="k">FROM</span> <span class="o">/</span><span class="n">regionEmployee</span><span class="p">.</span><span class="n">entrySet</span> <span class="n">e</span>
+</code></pre></div>
+<blockquote>
+<p>Note: You can have multiple queries in the same paragraph but only the result from the first is displayed. [<a href="https://issues.apache.org/jira/browse/ZEPPELIN-178">1</a>], [<a href="https://issues.apache.org/jira/browse/ZEPPELIN-212">2</a>].</p>
+</blockquote>
+
+<h3>GFSH Commands From The Shell</h3>
+
+<p>Use the Shell Interpreter (<code>%sh</code>) to run OQL commands form the command line:</p>
+<div class="highlight"><pre><code class="bash language-bash" data-lang="bash">%sh
+<span class="nb">source</span> /etc/geode/conf/geode-env.sh
+gfsh -e <span class="s2">"connect"</span> -e <span class="s2">"list members"</span>
+</code></pre></div>
+<h3>Apply Zeppelin Dynamic Forms</h3>
+
+<p>You can leverage <a href="../usage/dynamic_form/intro.html">Zeppelin Dynamic Form</a> inside your OQL queries. You can use both the <code>text input</code> and <code>select form</code> parameterization features</p>
+<div class="highlight"><pre><code class="sql language-sql" data-lang="sql"><span class="o">%</span><span class="n">geode</span><span class="p">.</span><span class="n">oql</span>
+<span class="k">SELECT</span> <span class="o">*</span> <span class="k">FROM</span> <span class="o">/</span><span class="n">regionEmployee</span> <span class="n">e</span> <span class="k">WHERE</span> <span class="n">e</span><span class="p">.</span><span class="n">employeeId</span> <span class="o">></span> <span class="err">${</span><span class="n">Id</span><span class="err">}</span>
+</code></pre></div>
+<h3>Auto-completion</h3>
+
+<p>The Geode Interpreter provides a basic auto-completion functionality. On <code>(Ctrl+.)</code> it list the most relevant suggestions in a pop-up window.</p>
+
+<h2>Geode REST API</h2>
+
+<p>To list the defined regions you can use the <a href="http://geode-docs.cfapps.io/docs/geode_rest/chapter_overview.html">Geode REST API</a>:</p>
+<div class="highlight"><pre><code class="text language-text" data-lang="text">http://<geode server hostname>phd1.localdomain:8484/gemfire-api/v1/
+</code></pre></div><div class="highlight"><pre><code class="json language-json" data-lang="json"><span class="p">{</span>
+ <span class="nt">"regions"</span> <span class="p">:</span> <span class="p">[{</span>
+ <span class="nt">"name"</span> <span class="p">:</span> <span class="s2">"regionEmployee"</span><span class="p">,</span>
+ <span class="nt">"type"</span> <span class="p">:</span> <span class="s2">"REPLICATE"</span><span class="p">,</span>
+ <span class="nt">"key-constraint"</span> <span class="p">:</span> <span class="kc">null</span><span class="p">,</span>
+ <span class="nt">"value-constraint"</span> <span class="p">:</span> <span class="kc">null</span>
+ <span class="p">},</span> <span class="p">{</span>
+ <span class="nt">"name"</span> <span class="p">:</span> <span class="s2">"regionCompany"</span><span class="p">,</span>
+ <span class="nt">"type"</span> <span class="p">:</span> <span class="s2">"REPLICATE"</span><span class="p">,</span>
+ <span class="nt">"key-constraint"</span> <span class="p">:</span> <span class="kc">null</span><span class="p">,</span>
+ <span class="nt">"value-constraint"</span> <span class="p">:</span> <span class="kc">null</span>
+ <span class="p">}]</span>
+<span class="p">}</span>
+</code></pre></div>
+<blockquote>
+<p>To enable Geode REST API with JSON support add the following properties to geode.server.properties.file and restart:</p>
+</blockquote>
+<div class="highlight"><pre><code class="text language-text" data-lang="text">http-service-port=8484
+start-dev-rest-api=true
+</code></pre></div>
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+
+<!--<div class="hero-unit Apache Groovy Interpreter for Apache Zeppelin">
+ <h1></h1>
+</div>
+-->
+
+<div class="row">
+ <div class="col-md-12">
+ <!--
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
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+See the License for the specific language governing permissions and
+limitations under the License.
+-->
+
+<h1>Groovy Interpreter for Apache Zeppelin</h1>
+
+<h3>Samples</h3>
+<div class="highlight"><pre><code class="groovy language-groovy" data-lang="groovy"><span class="o">%</span><span class="n">groovy</span>
+<span class="c1">//get a parameter defined as z.angularBind('ngSearchParam', value, 'paragraph_id')</span>
+<span class="c1">//g is a context object for groovy to avoid mix with z object</span>
+<span class="kt">def</span> <span class="n">param</span> <span class="o">=</span> <span class="n">g</span><span class="o">.</span><span class="na">angular</span><span class="o">(</span><span class="s1">'ngSearchParam'</span><span class="o">)</span>
+<span class="c1">//send request https://www.googleapis.com/customsearch/v1?q=ngSearchParam_value</span>
+<span class="kt">def</span> <span class="n">r</span> <span class="o">=</span> <span class="n">HTTP</span><span class="o">.</span><span class="na">get</span><span class="o">(</span>
+ <span class="c1">//assume you defined the groovy interpreter property</span>
+ <span class="c1">// `search_baseurl`='https://www.googleapis.com/customsearch/v1'</span>
+ <span class="c1">//in groovy object o.getProperty('A') == o.'A' == o.A == o['A']</span>
+ <span class="n">url</span> <span class="o">:</span> <span class="n">g</span><span class="o">.</span><span class="na">search_baseurl</span><span class="o">,</span>
+ <span class="nl">query:</span> <span class="o">[</span> <span class="nl">q:</span> <span class="n">param</span> <span class="o">],</span>
+ <span class="nl">headers:</span> <span class="o">[</span>
+ <span class="s1">'Accept'</span><span class="o">:</span><span class="s1">'application/json'</span><span class="o">,</span>
+ <span class="c1">//'Authorization:' : g.getProperty('search_auth'),</span>
+ <span class="o">],</span>
+ <span class="n">ssl</span> <span class="o">:</span> <span class="n">g</span><span class="o">.</span><span class="na">getProperty</span><span class="o">(</span><span class="s1">'search_ssl'</span><span class="o">)</span> <span class="c1">// assume groovy interpreter property search_ssl = HTTP.getNaiveSSLContext()</span>
+<span class="o">)</span>
+<span class="c1">//check response code</span>
+<span class="k">if</span><span class="o">(</span> <span class="n">r</span><span class="o">.</span><span class="na">response</span><span class="o">.</span><span class="na">code</span><span class="o">==</span><span class="mi">200</span> <span class="o">)</span> <span class="o">{</span>
+ <span class="n">g</span><span class="o">.</span><span class="na">html</span><span class="o">().</span><span class="na">with</span><span class="o">{</span>
+ <span class="c1">//g.html() renders %angular to output and returns groovy.xml.MarkupBuilder</span>
+ <span class="n">h2</span><span class="o">(</span><span class="s2">"the response ${r.response.code}"</span><span class="o">)</span>
+ <span class="n">span</span><span class="o">(</span> <span class="n">r</span><span class="o">.</span><span class="na">response</span><span class="o">.</span><span class="na">body</span> <span class="o">)</span>
+ <span class="n">h2</span><span class="o">(</span><span class="s2">"headers"</span><span class="o">)</span>
+ <span class="n">pre</span><span class="o">(</span> <span class="n">r</span><span class="o">.</span><span class="na">response</span><span class="o">.</span><span class="na">headers</span><span class="o">.</span><span class="na">join</span><span class="o">(</span><span class="s1">'\n'</span><span class="o">)</span> <span class="o">)</span>
+ <span class="o">}</span>
+<span class="o">}</span> <span class="k">else</span> <span class="o">{</span>
+ <span class="c1">//just to show that it's possible to use println with multiline groovy string to render output</span>
+ <span class="n">println</span><span class="o">(</span><span class="s2">"""%angular</span>
+<span class="s2"> <script> alert ("</span><span class="n">code</span><span class="o">=</span><span class="n">$</span><span class="o">{</span><span class="n">r</span><span class="o">.</span><span class="na">response</span><span class="o">.</span><span class="na">code</span><span class="o">}</span> <span class="err">\</span><span class="n">n</span> <span class="n">msg</span><span class="o">=</span><span class="n">$</span><span class="o">{</span><span class="n">r</span><span class="o">.</span><span class="na">response</span><span class="o">.</span><span class="na">message</span><span class="o">}</span><span class="s2">") </script></span>
+<span class="s2"> """</span><span class="o">)</span>
+<span class="o">}</span>
+</code></pre></div><div class="highlight"><pre><code class="groovy language-groovy" data-lang="groovy"><span class="o">%</span><span class="n">groovy</span>
+
+<span class="c1">//renders a table with headers a, b, c and two rows</span>
+<span class="n">g</span><span class="o">.</span><span class="na">table</span><span class="o">(</span>
+ <span class="o">[</span>
+ <span class="o">[</span><span class="s1">'a'</span><span class="o">,</span><span class="s1">'b'</span><span class="o">,</span><span class="s1">'c'</span><span class="o">],</span>
+ <span class="o">[</span><span class="s1">'a1'</span><span class="o">,</span><span class="s1">'b1'</span><span class="o">,</span><span class="s1">'c1'</span><span class="o">],</span>
+ <span class="o">[</span><span class="s1">'a2'</span><span class="o">,</span><span class="s1">'b2'</span><span class="o">,</span><span class="s1">'c2'</span><span class="o">],</span>
+ <span class="o">]</span>
+<span class="o">)</span>
+</code></pre></div>
+<h3>the <code>g</code> object</h3>
+
+<ul>
+<li><p><code>g.angular(String name)</code></p>
+
+<p>Returns angular object by name. Look up notebook scope first and then global scope.</p></li>
+<li><p><code>g.angularBind(String name, Object value)</code></p>
+
+<p>Assign a new <code>value</code> into angular object <code>name</code></p></li>
+<li><p><code>java.util.Properties g.getProperties()</code></p>
+
+<p>returns all properties defined for this interpreter</p></li>
+<li><p><code>String g.getProperty('PROPERTY_NAME')</code> </p>
+<div class="highlight"><pre><code class="groovy language-groovy" data-lang="groovy"><span class="n">g</span><span class="o">.</span><span class="na">PROPERTY_NAME</span>
+<span class="n">g</span><span class="o">.</span><span class="s1">'PROPERTY_NAME'</span>
+<span class="n">g</span><span class="o">[</span><span class="s1">'PROPERTY_NAME'</span><span class="o">]</span>
+<span class="n">g</span><span class="o">.</span><span class="na">getProperties</span><span class="o">().</span><span class="na">getProperty</span><span class="o">(</span><span class="s1">'PROPERTY_NAME'</span><span class="o">)</span>
+</code></pre></div>
+<p>All above the accessor to named property defined in groovy interpreter.
+In this case with name <code>PROPERTY_NAME</code></p></li>
+<li><p><code>groovy.xml.MarkupBuilder g.html()</code></p>
+
+<p>Starts or continues rendering of <code>%angular</code> to output and returns <a href="http://groovy-lang.org/processing-xml.html#_markupbuilder">groovy.xml.MarkupBuilder</a>
+MarkupBuilder is usefull to generate html (xml)</p></li>
+<li><p><code>void g.table(obj)</code></p>
+
+<p>starts or continues rendering table rows.</p>
+
+<p>obj: List(rows) of List(columns) where first line is a header </p></li>
+<li><p><code>g.input(name, value )</code></p>
+
+<p>Creates <code>text</code> input with value specified. The parameter <code>value</code> is optional.</p></li>
+<li><p><code>g.select(name, default, Map<Object, String> options)</code></p>
+
+<p>Creates <code>select</code> input with defined options. The parameter <code>default</code> is optional.</p>
+
+<p><code>g.select('sex', 'm', ['m':'man', 'w':'woman'])</code></p></li>
+<li><p><code>g.checkbox(name, Collection checked, Map<Object, String> options)</code></p>
+
+<p>Creates <code>checkbox</code> input.</p></li>
+<li><p><code>g.get(name, default)</code></p>
+
+<p>Returns interpreter-based variable. Visibility depends on interpreter scope. The parameter <code>default</code> is optional.</p></li>
+<li><p><code>g.put(name, value)</code></p>
+
+<p>Stores new value into interpreter-based variable. Visibility depends on interpreter scope.</p></li>
+</ul>
+
+ </div>
+</div>
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