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| <!DOCTYPE document[ |
| <!ENTITY hellip "…" > |
| ]> |
| |
| <document id="$Id$"> |
| |
| <properties> |
| <title>Developer's guide: Dashboard generator</title> |
| </properties> |
| |
| <body> |
| |
| <section name="Dashboard generator"> |
| <p> |
| This document describes the architecture and operation of the |
| dashboard generation engine. |
| </p> |
| <subsection name="1 Overview" anchor="overview"> |
| <subsection name="1.1 Architecture" anchor="overview_architecture"> |
| <p> |
| The dashboard generation engine is a modular feature based on |
| samples operation processes. |
| <br /> |
| The processes can be represented by the following diagram: |
| </p> |
| <figure image="dashboard.png">Figure 1 - Dashboard generation overview</figure> |
| <p> |
| In this view, you can see: |
| <ul> |
| <li> |
| A source from where samples are produced (e.g. CSV file). |
| </li> |
| <li> |
| A chain of items, named consumers, that operate |
| on the samples |
| that go through the chain |
| (e.g. Filtering, sorting, calculation, …). |
| </li> |
| <li> |
| An execution context, named sample context, where the results |
| of consumers calculations are stored. |
| </li> |
| <li> |
| A set of items, named exporters, that use the content of the |
| sample context to generate a final result to the user (e.g. |
| HTML |
| page generation). |
| </li> |
| </ul> |
| </p> |
| </subsection> |
| <subsection name="1.2 Operation" anchor="overview_operation"> |
| <p> |
| Before producing samples, the source is associated with a sample |
| context that will be used to store the consumers results. |
| </p> |
| <p> |
| Then a chain of consumers is built using JMeter properties |
| (prefixed by |
| <code>jmeter.reportgenerator</code> |
| ) in order to enable the user to customize it. |
| </p> |
| <p> |
| When the source emits a sample, it sends it to the first consumer |
| of the chain. |
| <br /> |
| The consumer can have different behaviors: |
| <ul> |
| <li>It can process the sample and send it to the next |
| consumers.</li> |
| <li>It cannot process the sample, so it stores it and |
| continues to |
| receive other samples. When it can process the |
| stored samples, it |
| does so and sends the whole to the next |
| consumers (e.g. sorting).</li> |
| <li>It can choose to discard the sample (e.g. |
| filtering).</li> |
| </ul> |
| When the source stops producing samples, consumers can publish a |
| result in the sample context. |
| <br /> |
| The latter is send to the set of exporters in order to create |
| results used by final user. |
| </p> |
| </subsection> |
| </subsection> |
| |
| <subsection name="2 Consumers chain details" anchor="consumers_chain"> |
| <p> |
| |
| </p> |
| <figure image="chain.png">Figure 2 - Consumers chain</figure> |
| <p> |
| The chain begins with a normalizer consumer in charge of |
| standardizing the timestamp of each sample because JMeter allows |
| different timestamp formats (See |
| <code>jmeter.save.saveservice.timestamp_format</code> |
| ). |
| </p> |
| <p> |
| Then two consumers have to define the start time and end time of |
| the load tests. |
| </p> |
| <p> |
| At the same level a filter consumer keeps or |
| discards samples |
| depending on the |
| <code>jmeter.reportgenerator.sample_filter</code> |
| property. |
| </p> |
| <p> Another filter is plugged after to discard controller |
| samples. |
| </p> |
| <p> |
| Depending on the property |
| <code>jmeter.reportgenerator.graph.<graph_id>.exclude_controllers</code> |
| , the graph consumer matching the |
| <code>graph_id</code> |
| identifier will be |
| set at position |
| <code>A</code> |
| or |
| <code>B</code> |
| . |
| </p> |
| </subsection> |
| |
| <subsection name="3 Template processing" anchor="process_template"> |
| <subsection name="3.1 Overview" anchor="template_overview"> |
| <p> |
| The default exporter of the generator use the template engine |
| <a href="http://freemarker.org/">freemarker</a> |
| to produce html pages. |
| <br /> |
| Template files are located in the template |
| directory defined by |
| the JMeter property |
| "<code>jmeter.reportgenerator.template_dir</code>" |
| and have |
| the extension "<code>.fmkr</code>". |
| </p> |
| <p> |
| The graph references in the template |
| files use the syntax : |
| <code>${<graph_id>.<value>}</code> where : |
| <dl> |
| <dt><code>graph_id</code></dt> |
| <dd>is the identifier of the graph matching the JMeter |
| properties definition</dd> |
| <dt><code>value</code></dt> |
| <dd>is the name of the value where data are stored.</dd> |
| </dl> |
| </p> |
| <p> |
| Each graph produces the following values : |
| <dl> |
| <dt><code>maxX</code>:</dt> |
| <dd>The maximum abscissa of the graph (double).</dd> |
| <dt><code>maxY</code>:</dt> |
| <dd>The maximum ordinate of the graph (double).</dd> |
| <dt><code>minX</code>:</dt> |
| <dd>The minimum abscissa of the graph (double).</dd> |
| <dt><code>minY</code>:</dt> |
| <dd>The maximum ordinate of the graph (double).</dd> |
| <dt><code>title</code>:</dt> |
| <dd>The title of the graph (string).</dd> |
| <dt><code>values</code>:</dt> |
| <dd>A JSON object representing the data of the graph series |
| (string).</dd> |
| </dl> |
| </p> |
| <!-- <note> --> |
| <!-- Graph can provide some other values, see --> |
| <!-- <a href="#default_graphs">Default --> |
| <!-- graph section</a> --> |
| <!-- to get the list of these values for default graphs. --> |
| <!-- </note> --> |
| </subsection> |
| <subsection name="3.2 Customization" anchor="template_customization"> |
| <p>You can customize the dashboard generation by modifying the |
| files in the |
| template directory. |
| </p> |
| <p> |
| If you want to add a graph to the dashboard, |
| you have to |
| <a href="#configure_graph">declare it among the JMeter properties</a> |
| and use its references in the template files. |
| </p> |
| <p>If you want to remove |
| a graph from the dashboard, you must remove |
| all its references in |
| the template |
| files and clear JMeter |
| properties.</p> |
| </subsection> |
| </subsection> |
| |
| <subsection name="4 Limitations and Outlooks" anchor="outlooks"> |
| <ul> |
| <li> |
| <p>Till now, there is only one sample source implementation which |
| is strongly coupled with the CSV file format, we should allow |
| other kinds of source by using a sample source interface.</p> |
| </li> |
| <li> |
| <p> |
| To add customized graph, users must extend the |
| <code>AbstractGraphConsumer</code> |
| or use one of the implementations provided |
| in the package |
| <code>org.apache.jmeter.report.processor.graph.impl</code> |
| . |
| This could be enhanced by making concrete the base class and |
| give |
| public access to additional properties (like selectors). But |
| first |
| we have to resolve the issue of shared properties (e.g. over |
| time |
| graphs must dispatch the same granularity property to the |
| keys |
| selector and time rate aggregator). |
| </p> |
| </li> |
| <li> |
| <p> |
| The chain building is dispatched between the |
| <code>org.apache.jmeter.report.dashboard.ReportGenerator.generate</code> |
| method |
| and the implementation of the consumers. So the code in |
| charge of |
| the building is split and furthermore some consumers can |
| be |
| redundant and harm the performance of report generation, not |
| load testing. |
| </p> |
| <p> |
| E.g. Each |
| <code>LatencyVSRequestGraphConsumer</code> |
| and |
| <code>ResponseTimeVSRequestGraphConsumer</code> |
| instances use an embedded |
| consumer that could be shared depending |
| on |
| <code>granularity</code> |
| and |
| <code>exclude_controllers</code> |
| properties. |
| </p> |
| <p> |
| So we should enable the consumers to define the chain they |
| require and provide a single chain builder that processes these |
| chain requirements to instantiate needed consumers on demand. |
| I.e. |
| for the same chain requirement declaration, the same consumer |
| instances are used. Otherwise if the declaration differs, a new |
| branch of consumers is created. |
| </p> |
| </li> |
| <li> |
| <p> |
| The graphs (DOM elements) in the generated HTML page should be |
| dynamically build in order to match the graphs defined in JMeter |
| properties. |
| </p> |
| </li> |
| <li> |
| <p> |
| Some improvements can be done on the generated html pages: |
| <ul> |
| <li>Using a single page, and hide graphs depending on the |
| navigation menu selection.</li> |
| <li>Adding a loading animation when graphs are build or |
| refreshed.</li> |
| <li>Let the user determine if a graph is zoomable using a JMeter |
| property.</li> |
| <li> |
| Using the |
| <code>jquery.plot.setData()</code> |
| method to handle series |
| activation/deactivation rather than |
| rebuild the graph. |
| </li> |
| </ul> |
| </p> |
| </li> |
| </ul> |
| </subsection> |
| </section> |
| |
| </body> |
| </document> |
| |
