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<li class="toctree-l3"><a class="reference internal" href="geopm_agent_power_balancer.7.html">geopm_agent_power_balancer(7) – agent optimizes performance under a power cap</a></li>
<li class="toctree-l3"><a class="reference internal" href="geopm_agent_power_governor.7.html">geopm_agent_power_governor(7) – agent enforces a power cap</a></li>
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<section id="geopm-pluginfactory-3-abstract-factory-for-plugins">
<h1>geopm::PluginFactory(3) – abstract factory for plugins<a class="headerlink" href="#geopm-pluginfactory-3-abstract-factory-for-plugins" title="Link to this heading"></a></h1>
<section id="namespaces">
<h2>Namespaces<a class="headerlink" href="#namespaces" title="Link to this heading"></a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">PluginFactory</span></code> class template is a member of the <code class="docutils literal notranslate"><span class="pre">namespace</span> <span class="pre">geopm</span></code>, but
the full name, <code class="docutils literal notranslate"><span class="pre">geopm::PluginFactory<class</span> <span class="pre">T></span></code>, has been abbreviated in this
manual. Similarly, the <code class="docutils literal notranslate"><span class="pre">std::</span></code> namespace specifier has been omitted from the
interface definitions for the following standard types: <code class="docutils literal notranslate"><span class="pre">std::vector</span></code>,
<code class="docutils literal notranslate"><span class="pre">std::string</span></code>, <code class="docutils literal notranslate"><span class="pre">std::set</span></code>, and <code class="docutils literal notranslate"><span class="pre">std::function</span></code>, to enable better rendering of
this manual.</p>
</section>
<section id="synopsis">
<h2>Synopsis<a class="headerlink" href="#synopsis" title="Link to this heading"></a></h2>
<p>#include <a class="reference external" href="https://github.com/geopm/geopm/blob/dev/libgeopmd/include/geopm/PluginFactory.hpp"><geopm/PluginFactory.hpp></a></p>
<p>Link with <code class="docutils literal notranslate"><span class="pre">-lgeopm</span></code> <strong>(MPI)</strong> or <code class="docutils literal notranslate"><span class="pre">-lgeopm</span></code> <strong>(non-MPI)</strong></p>
<div class="highlight-c++ notranslate"><div class="highlight"><pre><span></span><span class="kt">void</span><span class="w"> </span><span class="n">PluginFactory</span><span class="o"><</span><span class="n">T</span><span class="o">>::</span><span class="n">register_plugin</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">plugin_name</span><span class="p">,</span>
<span class="w"> </span><span class="n">function</span><span class="o"><</span><span class="n">unique_ptr</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">()</span><span class="o">></span><span class="w"> </span><span class="n">make_plugin</span><span class="p">,</span>
<span class="w"> </span><span class="k">const</span><span class="w"> </span><span class="n">map</span><span class="o"><</span><span class="n">string</span><span class="p">,</span><span class="w"> </span><span class="n">string</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="n">dictionary</span><span class="p">);</span>
<span class="n">unique_ptr</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="w"> </span><span class="n">PluginFactory</span><span class="o"><</span><span class="n">T</span><span class="o">>::</span><span class="n">make_plugin</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">plugin_name</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="p">;</span>
<span class="n">vector</span><span class="o"><</span><span class="n">string</span><span class="o">></span><span class="w"> </span><span class="n">PluginFactory</span><span class="o"><</span><span class="n">T</span><span class="o">>::</span><span class="n">plugin_names</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="p">;</span>
<span class="k">const</span><span class="w"> </span><span class="n">map</span><span class="o"><</span><span class="n">string</span><span class="p">,</span><span class="w"> </span><span class="n">string</span><span class="o">>&</span><span class="w"> </span><span class="n">PluginFactory</span><span class="o"><</span><span class="n">T</span><span class="o">>::</span><span class="n">dictionary</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="n">string</span><span class="w"> </span><span class="o">&</span><span class="n">plugin_name</span><span class="p">)</span><span class="w"> </span><span class="k">const</span><span class="p">;</span>
</pre></div>
</div>
</section>
<section id="description">
<h2>Description<a class="headerlink" href="#description" title="Link to this heading"></a></h2>
<p>GEOPM can be extended though <code class="docutils literal notranslate"><span class="pre">Agent</span></code>, <code class="docutils literal notranslate"><span class="pre">IOGroup</span></code>, and <code class="docutils literal notranslate"><span class="pre">Comm</span></code> plugins.
This man page describes the steps for adding a plugin. Refer to
<a class="reference internal" href="geopm%3A%3AAgent.3.html"><span class="doc">geopm::Agent(3)</span></a>, and <a class="reference internal" href="geopm%3A%3AIOGroup.3.html"><span class="doc">geopm::IOGroup(3)</span></a> for
more details about these interfaces. Any <strong>C++</strong> class that derives from
one of these plugin base classes and is compiled into a shared object
file can be loaded at application launch time through the GEOPM plugin
interface. This allows users and system administrators to extend the
features and behavior of the monitor and control process that GEOPM
executes without recompiling the GEOPM runtime.</p>
<p>There are several steps to implementing and integrating a plugin into
GEOPM. First, the base class interface must be completely implemented
by the new class. In addition to the <code class="docutils literal notranslate"><span class="pre">virtual</span></code> methods required by the
interface, there are several recommended <code class="docutils literal notranslate"><span class="pre">static</span></code> class methods,
described below, that should also be implemented by the derived class
to aid in registration with the plugin factory. Finally, the plugin
must be registered with the appropriate factory at plugin load time.
This process is discussed in more detail in the following sections.
The factory singletons for <code class="docutils literal notranslate"><span class="pre">Agent</span></code>, <code class="docutils literal notranslate"><span class="pre">IOGroup</span></code>, and <code class="docutils literal notranslate"><span class="pre">Comm</span></code> plugins are
available through their respective single accessor functions:
<code class="docutils literal notranslate"><span class="pre">geopm::agent_factory()</span></code>, <code class="docutils literal notranslate"><span class="pre">geopm::iogroup_factory()</span></code>, and
<code class="docutils literal notranslate"><span class="pre">geopm::comm_factory()</span></code>.</p>
<p>A good starting point for implementing a new <code class="docutils literal notranslate"><span class="pre">Agent</span></code> or <code class="docutils literal notranslate"><span class="pre">IOGroup</span></code>
plugin is to modify the examples found in the <a class="reference external" href="https://github.com/geopm/geopm/tree/dev/tutorial/agent">Agent tutorial</a> and
the <a class="reference external" href="https://github.com/geopm/geopm/tree/dev/tutorial/iogroup">IOGroup tutorial</a>.
This code is located in the GEOPM source under <code class="docutils literal notranslate"><span class="pre">tutorial/agent</span></code> and
<code class="docutils literal notranslate"><span class="pre">tutorial/iogroup</span></code> respectively.</p>
</section>
<section id="terms">
<h2>Terms<a class="headerlink" href="#terms" title="Link to this heading"></a></h2>
<p>Below are some definitions of terms that are used to describe
different parts of the GEOPM runtime. Understanding these terms will
help to interpret the documentation about how to extend the GEOPM
runtime. These are arranged from from highest levels of abstraction
down to the lowest levels of abstraction.</p>
<dl class="simple">
<dt><strong>launcher</strong>:</dt><dd><p>Wrapper of system application launch (e.g. <code class="docutils literal notranslate"><span class="pre">srun</span></code> or <code class="docutils literal notranslate"><span class="pre">aprun</span></code>) that
executes the GEOPM runtime with the application.</p>
</dd>
<dt><strong>report</strong>:</dt><dd><p>Text file containing summary of aggregated stats collected during
application run.</p>
</dd>
<dt><strong>trace</strong>:</dt><dd><p>Time series of signals collected over application run in a pipe
separated ASCII table.</p>
</dd>
<dt><strong>agent</strong>:</dt><dd><p>Implementation used by GEOPM to interpret sampled data and
enforce the appropriate controls.</p>
</dd>
<dt><strong>policy</strong>:</dt><dd><p>Array of floating-point settings for <code class="docutils literal notranslate"><span class="pre">Agent</span></code>-specific control
parameters in SI units.</p>
</dd>
<dt><strong>sample</strong>:</dt><dd><p>Array of floating-point values providing <code class="docutils literal notranslate"><span class="pre">Agent</span></code>-specific runtime
statistics in SI units.</p>
</dd>
<dt><strong>endpoint</strong>:</dt><dd><p>Interface between resource manager and GEOPM runtime. This feature
is still under development and is only available when GEOPM is compiled
with the <code class="docutils literal notranslate"><span class="pre">--enable-beta</span></code> flag.</p>
</dd>
<dt><strong>profile</strong>:</dt><dd><p>Interface for annotating compute application; provides <code class="docutils literal notranslate"><span class="pre">PlatformIO</span></code>
region signals.</p>
</dd>
<dt><strong>controller</strong>:</dt><dd><p>Thread on each compute node that loads plugins and runs GEOPM
algorithm.</p>
</dd>
<dt><strong>level</strong>:</dt><dd><p>Attribute of an <code class="docutils literal notranslate"><span class="pre">Agent</span></code> describing the number of edges between it
and the nearest leaf <code class="docutils literal notranslate"><span class="pre">Agent</span></code> in the communication tree (a leaf
<code class="docutils literal notranslate"><span class="pre">Agent</span></code> is <em>level</em> zero).</p>
</dd>
<dt><strong>signal</strong>:</dt><dd><p>Named parameter in SI units that can be measured using <code class="docutils literal notranslate"><span class="pre">PlatformIO</span></code>.</p>
</dd>
<dt><strong>control</strong>:</dt><dd><p>Named parameter in SI units that can be set using <code class="docutils literal notranslate"><span class="pre">PlatformIO</span></code>.</p>
</dd>
</dl>
</section>
<section id="factory-class-methods">
<h2>Factory Class Methods<a class="headerlink" href="#factory-class-methods" title="Link to this heading"></a></h2>
<dl class="simple">
<dt><code class="docutils literal notranslate"><span class="pre">register_plugin()</span></code></dt><dd><p>Add a plugin to this factory. The <em>plugin_name</em> parameter will be used to request plugins of the
registered type. The <em>make_plugin</em> parameter is a function that
returns a new object of the registered type. The <em>dictionary</em> is
an optional string-to-string dictionary containing static
information about the registered type.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">make_plugin()</span></code></dt><dd><p>Creates an object of the registered type. If the type was not previously registered, an exception will be thrown. The
<em>plugin_name</em> parameter will be used to look up the constructor function
used to create the object. Returns a <code class="docutils literal notranslate"><span class="pre">unique_ptr</span></code> to the created object.
The caller owns the created object.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">plugin_names()</span></code></dt><dd><p>Returns a list of all valid plugin names that have been registered with this factory.</p>
</dd>
<dt><code class="docutils literal notranslate"><span class="pre">dictionary()</span></code></dt><dd><p>Returns an optional dictionary of static metadata about a registered type. If the type was not registered, an exception is thrown.
The <em>plugin_name</em> parameter is used to look up the desired dictionary.</p>
</dd>
</dl>
</section>
<section id="building-a-plugin-shared-object">
<h2>Building A Plugin Shared Object<a class="headerlink" href="#building-a-plugin-shared-object" title="Link to this heading"></a></h2>
<p>A GEOPM plugin is a shared object file that is loaded at runtime by
the <em>controller</em> through the <a class="reference external" href="https://man7.org/linux/man-pages/man3/dlopen.3.html">dlopen(3)</a> interface. Each file
provides a new implementation for one of the three extensible classes:
<code class="docutils literal notranslate"><span class="pre">IOGroup</span></code>, <code class="docutils literal notranslate"><span class="pre">Agent</span></code>, and <code class="docutils literal notranslate"><span class="pre">Comm</span></code>. Each implementation is identified by
a unique name string referred to as the <em>plugin_name</em>. An exception
will be thrown if more than one plugin of the same name and same type
are loaded. The <em>plugin_name</em> is standardized to be all lower case
letters. The shared object file names must conform to the pattern:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">libgeopm</span><span class="o"><</span><span class="n">CLASS</span><span class="o">></span><span class="n">_</span><span class="o"><</span><span class="n">NAME</span><span class="o">>.</span><span class="n">so</span><span class="mf">.2.1.0</span>
</pre></div>
</div>
<p>Here <code class="docutils literal notranslate"><span class="pre"><NAME></span></code> is the <em>plugin_name</em> and <code class="docutils literal notranslate"><span class="pre"><CLASS></span></code> is one of the three
strings identifying the plugin type: <code class="docutils literal notranslate"><span class="pre">"iogroup"</span></code>, <code class="docutils literal notranslate"><span class="pre">"agent"</span></code>, or <code class="docutils literal notranslate"><span class="pre">"comm"</span></code>.
The current GEOPM ABI version is <code class="docutils literal notranslate"><span class="pre">1.0.0</span></code>, and the file name must end
with this string. Plugins must be marked to have exactly the same ABI
version as the GEOPM library they are intended to be loaded by. Do
not link the plugin shared object against any of the GEOPM libraries;
this will cause a circular link dependency. Compile the shared object
with flags appropriate for a dynamically loaded library, e.g. for
<code class="docutils literal notranslate"><span class="pre">g++</span></code> and <code class="docutils literal notranslate"><span class="pre">icpx</span></code> you must provide the <code class="docutils literal notranslate"><span class="pre">-fPIC</span></code> and <code class="docutils literal notranslate"><span class="pre">-shared</span></code> options.</p>
</section>
<section id="plugin-search-path-and-load-order">
<h2>Plugin Search Path And Load Order<a class="headerlink" href="#plugin-search-path-and-load-order" title="Link to this heading"></a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">GEOPM_PLUGIN_PATH</span></code> is a colon-separated list of directories
that contain plugin shared object files to be loaded by the GEOPM
runtime. Any symlink that resides in a directory specified by this
variable will be ignored. See <a class="reference internal" href="geopm.7.html"><span class="doc">geopm(7)</span></a> for details
about <code class="docutils literal notranslate"><span class="pre">GEOPM_PLUGIN_PATH</span></code>. Note that an Exception will be thrown by
the <code class="docutils literal notranslate"><span class="pre">register_plugin()</span></code> method if an attempt is made to register a
plugin with the same name as a previously registered plugin.</p>
<p>In the case of <code class="docutils literal notranslate"><span class="pre">IOGroup</span></code> plugins, the most recently loaded plugin to
register a signal or control name provides the implementation at
runtime, even if an earlier <code class="docutils literal notranslate"><span class="pre">IOGroup</span></code> plugin had provided a signal or
control with the same name. The plugins in the <code class="docutils literal notranslate"><span class="pre">GEOPM_PLUGIN_PATH</span></code>
are loaded in reverse (right to left) order so that plugins earlier in
the search path from left to right are preferred when looking up
signal and control implementations. The default search path
(<code class="docutils literal notranslate"><span class="pre"><PREFIX>/lib/geopm</span></code>) will have the lowest priority.</p>
<p>For example, if <code class="docutils literal notranslate"><span class="pre">GEOPM_PLUGIN_PATH</span></code> is set using the exports below,
the plugins in <code class="docutils literal notranslate"><span class="pre">$HOME/plugin/iogroup</span></code> will be used with the highest
priority to provide signal and control names, followed by the plugins
in <code class="docutils literal notranslate"><span class="pre">$GEOPM_HOME/tutorial/iogroup</span></code>. Plugins in the default path will
only be used if no higher priority implementation is found. A more
detailed example of plugin load order can be found in
<code class="docutils literal notranslate"><span class="pre">tutorial/plugin_load</span></code>.</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="nb">export</span><span class="w"> </span><span class="nv">GEOPM_PLUGIN_PATH</span><span class="o">=</span><span class="nv">$GEOPM_HOME</span>/tutorial/iogroup
<span class="nb">export</span><span class="w"> </span><span class="nv">GEOPM_PLUGIN_PATH</span><span class="o">=</span><span class="nv">$HOME</span>/plugin/iogroup:<span class="nv">$GEOPM_PLUGIN_PATH</span>
</pre></div>
</div>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>It is imperative that any dynamically loaded library that is a dependency
of a plugin is available in the environment of the systemd initiated geopmd
service. If dependent libraries are not available on the root user’s
LD_LIBRARY_PATH, the plugin will fail to load.
For this reason, it is recommended that any plugins are compiled with
system installed gcc/g++ compilers.</p>
</div>
</section>
<section id="plugin-load-constructor-function">
<h2>Plugin Load Constructor Function<a class="headerlink" href="#plugin-load-constructor-function" title="Link to this heading"></a></h2>
<p>The shared object file must provide a function that is decorated with
the <code class="docutils literal notranslate"><span class="pre">constructor</span></code> compiler directive. The <code class="docutils literal notranslate"><span class="pre">__attribute__((constructor))</span></code>
enables the registration of plugins when the shared object is loaded
by a call to <a class="reference external" href="https://man7.org/linux/man-pages/man3/dlopen.3.html">dlopen(3)</a>.
Please see the <code class="docutils literal notranslate"><span class="pre">gcc</span></code> documentation for the
<a class="reference external" href="https://gcc.gnu.org/onlinedocs/gcc-4.3.0/gcc/Function-Attributes.html">constructor attribute</a>.</p>
</section>
<section id="plugin-class-static-methods">
<h2>Plugin Class Static Methods<a class="headerlink" href="#plugin-class-static-methods" title="Link to this heading"></a></h2>
<p>It is recommended that each class deriving from one of the GEOPM
plugin classes implement two static helper methods called
<code class="docutils literal notranslate"><span class="pre">plugin_name()</span></code> and <code class="docutils literal notranslate"><span class="pre">make_plugin()</span></code>. These functions can be used to
provide the inputs to <code class="docutils literal notranslate"><span class="pre">PluginFactory::register_plugin()</span></code>. Note that
the first argument to <code class="docutils literal notranslate"><span class="pre">register_plugin()</span></code> is a <code class="docutils literal notranslate"><span class="pre">string</span></code>, i.e. the result
of calling <code class="docutils literal notranslate"><span class="pre">plugin_name()</span></code>, whereas the <code class="docutils literal notranslate"><span class="pre">make_plugin()</span></code> function itself is
passed as the second argument. The <code class="docutils literal notranslate"><span class="pre">make_plugin()</span></code> function should take
no arguments and returns a <code class="docutils literal notranslate"><span class="pre">unique_ptr</span></code> to an object of the derived
class. The <code class="docutils literal notranslate"><span class="pre">plugin_name()</span></code> function should take no arguments and return a
<code class="docutils literal notranslate"><span class="pre">string</span></code> specifying the name of the plugin. The process for registering
<code class="docutils literal notranslate"><span class="pre">IOGroup</span></code> and <code class="docutils literal notranslate"><span class="pre">Comm</span></code> plugins is identical other than the factory singleton
name and is shown in the example below. In the case of <code class="docutils literal notranslate"><span class="pre">Agent</span></code> plugins,
additional metadata is passed in the form of a dictionary as the third
argument to <code class="docutils literal notranslate"><span class="pre">register_plugin()</span></code>. This dictionary is used by <code class="docutils literal notranslate"><span class="pre">Agent</span></code>
class helper methods to look up information about the sample and
policy names required by the <code class="docutils literal notranslate"><span class="pre">Agent</span></code>.</p>
</section>
<section id="example-register-iogroup-plugin">
<h2>EXAMPLE: REGISTER IOGROUP PLUGIN<a class="headerlink" href="#example-register-iogroup-plugin" title="Link to this heading"></a></h2>
<p>Please see the <a class="reference external" href="https://github.com/geopm/geopm/tree/dev/tutorial/iogroup">IOGroup tutorial</a> for more
information. This code is located in the GEOPM source under <code class="docutils literal notranslate"><span class="pre">tutorial/iogroup</span></code>.</p>
<div class="highlight-c++ notranslate"><div class="highlight"><pre><span></span><span class="c1">// This example shows how to register an IOGroup plugin</span>
<span class="cp">#include</span><span class="w"> </span><span class="cpf"><geopm/IOGroup.hpp></span><span class="c1"> // geopm::IOGroup,</span>
<span class="w"> </span><span class="c1">// geopm::iogroup_factory</span>
<span class="cp">#include</span><span class="w"> </span><span class="cpf"><geopm/Helper.hpp></span><span class="c1"> // geopm::make_unique</span>
<span class="c1">// Header providing class ExampleIOGroup interface</span>
<span class="cp">#include</span><span class="w"> </span><span class="cpf">"ExampleIOGroup.hpp"</span>
<span class="c1">// Called during dlopen() to register plugin</span>
<span class="k">static</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">__attribute__</span><span class="p">((</span><span class="n">constructor</span><span class="p">))</span>
<span class="n">register_plugin_example_iogroup</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span>
<span class="p">{</span>
<span class="w"> </span><span class="n">geopm</span><span class="o">::</span><span class="n">PluginFactory</span><span class="o"><</span><span class="n">geopm</span><span class="o">::</span><span class="n">IOGroup</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="n">iof</span><span class="w"> </span><span class="o">=</span>
<span class="w"> </span><span class="n">geopm</span><span class="o">::</span><span class="n">iogroup_factory</span><span class="p">();</span>
<span class="w"> </span><span class="n">iof</span><span class="p">.</span><span class="n">register_plugin</span><span class="p">(</span><span class="n">ExampleIOGroup</span><span class="o">::</span><span class="n">plugin_name</span><span class="p">(),</span>
<span class="w"> </span><span class="n">ExampleIOGroup</span><span class="o">::</span><span class="n">make_plugin</span><span class="p">);</span>
<span class="p">}</span>
<span class="c1">// Static method used by the factory to create objects</span>
<span class="n">std</span><span class="o">::</span><span class="n">unique_ptr</span><span class="o"><</span><span class="n">IOGroup</span><span class="o">></span><span class="w"> </span><span class="n">ExampleIOGroup</span><span class="o">::</span><span class="n">make_plugin</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span>
<span class="p">{</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">geopm</span><span class="o">::</span><span class="n">make_unique</span><span class="o"><</span><span class="n">ExampleIOGroup</span><span class="o">></span><span class="p">();</span>
<span class="p">}</span>
<span class="c1">// Static method providing unique plugin name</span>
<span class="n">std</span><span class="o">::</span><span class="n">string</span><span class="w"> </span><span class="n">ExampleIOGroup</span><span class="o">::</span><span class="n">plugin_name</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span>
<span class="p">{</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="s">"example"</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
</section>
<section id="example-register-agent-plugin">
<h2>EXAMPLE: REGISTER AGENT PLUGIN<a class="headerlink" href="#example-register-agent-plugin" title="Link to this heading"></a></h2>
<p>Please see the <a class="reference external" href="https://github.com/geopm/geopm/tree/dev/tutorial/agent">Agent tutorial</a> for more
information. This code is located in the GEOPM source under <code class="docutils literal notranslate"><span class="pre">tutorial/agent</span></code>.</p>
<div class="highlight-c++ notranslate"><div class="highlight"><pre><span></span><span class="c1">// This example shows how to register an Agent plugin</span>
<span class="cp">#include</span><span class="w"> </span><span class="cpf"><geopm/Agent.hpp></span><span class="c1"> // geopm::Agent,</span>
<span class="w"> </span><span class="c1">// geopm::agent_factory</span>
<span class="cp">#include</span><span class="w"> </span><span class="cpf"><geopm/Helper.hpp></span><span class="c1"> // geopm::make_unique</span>
<span class="c1">// Header providing class ExampleAgent interface</span>
<span class="cp">#include</span><span class="w"> </span><span class="cpf">"ExampleAgent.hpp"</span>
<span class="c1">// Called during dlopen() to register plugin</span>
<span class="k">static</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">__attribute__</span><span class="p">((</span><span class="n">constructor</span><span class="p">))</span>
<span class="n">register_plugin_example_agent</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span>
<span class="p">{</span>
<span class="w"> </span><span class="n">geopm</span><span class="o">::</span><span class="n">PluginFactory</span><span class="o"><</span><span class="n">geopm</span><span class="o">::</span><span class="n">Agent</span><span class="o">></span><span class="w"> </span><span class="o">&</span><span class="n">af</span><span class="w"> </span><span class="o">=</span>
<span class="w"> </span><span class="n">geopm</span><span class="o">::</span><span class="n">agent_factory</span><span class="p">();</span>
<span class="w"> </span><span class="n">af</span><span class="p">.</span><span class="n">register_plugin</span><span class="p">(</span><span class="n">ExampleAgent</span><span class="o">::</span><span class="n">plugin_name</span><span class="p">(),</span>
<span class="w"> </span><span class="n">ExampleAgent</span><span class="o">::</span><span class="n">make_plugin</span><span class="p">,</span>
<span class="w"> </span><span class="n">geopm</span><span class="o">::</span><span class="n">Agent</span><span class="o">::</span><span class="n">make_dictionary</span><span class="p">(</span>
<span class="w"> </span><span class="n">ExampleAgent</span><span class="o">::</span><span class="n">policy_names</span><span class="p">(),</span>
<span class="w"> </span><span class="n">ExampleAgent</span><span class="o">::</span><span class="n">sample_names</span><span class="p">()));</span>
<span class="p">}</span>
<span class="c1">// Static method used by the factory to create objects</span>
<span class="n">std</span><span class="o">::</span><span class="n">unique_ptr</span><span class="o"><</span><span class="n">geopm</span><span class="o">::</span><span class="n">Agent</span><span class="o">></span><span class="w"> </span><span class="n">ExampleAgent</span><span class="o">::</span><span class="n">make_plugin</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span>
<span class="p">{</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">geopm</span><span class="o">::</span><span class="n">make_unique</span><span class="o"><</span><span class="n">ExampleAgent</span><span class="o">></span><span class="p">();</span>
<span class="p">}</span>
<span class="c1">// Static method providing unique plugin name</span>
<span class="n">std</span><span class="o">::</span><span class="n">string</span><span class="w"> </span><span class="n">ExampleAgent</span><span class="o">::</span><span class="n">plugin_name</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span>
<span class="p">{</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="s">"example"</span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
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</section>
<section id="see-also">
<h2>See Also<a class="headerlink" href="#see-also" title="Link to this heading"></a></h2>
<p><a class="reference internal" href="geopm.7.html"><span class="doc">geopm(7)</span></a>,
<a class="reference internal" href="geopm%3A%3AAgent.3.html"><span class="doc">geopm::Agent(3)</span></a>,
<a class="reference internal" href="geopm%3A%3AIOGroup.3.html"><span class="doc">geopm::IOGroup(3)</span></a>,
<a class="reference external" href="https://man7.org/linux/man-pages/man3/dlopen.3.html">dlopen(3)</a></p>
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