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<span class="project">groonga</span>
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<span class="description">An open-source fulltext search engine and column store.</span>
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<div class="section" id="plugin">
<h1><span class="section-number">7.25.3. </span>Plugin<a class="headerlink" href="#plugin" title="Permalink to this headline">¶</a></h1>
<div class="section" id="summary">
<h2><span class="section-number">7.25.3.1. </span>Summary<a class="headerlink" href="#summary" title="Permalink to this headline">¶</a></h2>
<p>Groonga supports plugin. You can create a new plugin with the
following API.</p>
<p>TOOD: Describe about how to create the minimum plugin here or create a
tutorial about it.</p>
</div>
<div class="section" id="reference">
<h2><span class="section-number">7.25.3.2. </span>Reference<a class="headerlink" href="#reference" title="Permalink to this headline">¶</a></h2>
<dl class="c function">
<dt id="c.GRN_PLUGIN_INIT">
grn_rc <code class="sig-name descname">GRN_PLUGIN_INIT</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em><span class="sig-paren">)</span><a class="headerlink" href="#c.GRN_PLUGIN_INIT" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
<dl class="c function">
<dt id="c.GRN_PLUGIN_REGISTER">
grn_rc <code class="sig-name descname">GRN_PLUGIN_REGISTER</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em><span class="sig-paren">)</span><a class="headerlink" href="#c.GRN_PLUGIN_REGISTER" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
<dl class="c function">
<dt id="c.GRN_PLUGIN_FIN">
grn_rc <code class="sig-name descname">GRN_PLUGIN_FIN</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em><span class="sig-paren">)</span><a class="headerlink" href="#c.GRN_PLUGIN_FIN" title="Permalink to this definition">¶</a><br /></dt>
<dd></dd></dl>
<dl class="c macro">
<dt id="c.GRN_PLUGIN_MALLOC">
<code class="sig-name descname">GRN_PLUGIN_MALLOC</code><span class="sig-paren">(</span><em>ctx</em>, <em>size</em><span class="sig-paren">)</span><a class="headerlink" href="#c.GRN_PLUGIN_MALLOC" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>GRN_PLUGIN_MALLOC() allocates <cite>size</cite> bytes and returns a pointer to the
allocated memory space. Note that the memory space is associated with <cite>ctx</cite>.</p>
</dd></dl>
<dl class="c macro">
<dt id="c.GRN_PLUGIN_REALLOC">
<code class="sig-name descname">GRN_PLUGIN_REALLOC</code><span class="sig-paren">(</span><em>ctx</em>, <em>ptr</em>, <em>size</em><span class="sig-paren">)</span><a class="headerlink" href="#c.GRN_PLUGIN_REALLOC" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>GRN_PLUGIN_REALLOC() resizes the memory space pointed to by <cite>ptr</cite> or
allocates a new memory space of <cite>size</cite> bytes. GRN_PLUGIN_REALLOC() returns
a pointer to the memory space. The contents is unchanged or copied from the
old memory space to the new memory space.</p>
</dd></dl>
<dl class="c macro">
<dt id="c.GRN_PLUGIN_FREE">
<code class="sig-name descname">GRN_PLUGIN_FREE</code><span class="sig-paren">(</span><em>ctx</em>, <em>ptr</em><span class="sig-paren">)</span><a class="headerlink" href="#c.GRN_PLUGIN_FREE" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>GRN_PLUGIN_FREE() frees a memory space allocated by GRN_PLUGIN_MALLOC() or
GRN_PLUGIN_REALLOC(). This means that <cite>ptr</cite> must be a pointer returned by
GRN_PLUGIN_MALLOC() or GRN_PLUGIN_REALLOC().</p>
</dd></dl>
<dl class="c macro">
<dt id="c.GRN_PLUGIN_LOG">
<code class="sig-name descname">GRN_PLUGIN_LOG</code><span class="sig-paren">(</span><em>ctx</em>, <em>level</em>, ...<span class="sig-paren">)</span><a class="headerlink" href="#c.GRN_PLUGIN_LOG" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>GRN_PLUGIN_LOG() reports a log of <cite>level</cite>. Its error message is generated
from the varying number of arguments, in which the first one is the format
string and the rest are its arguments. See grn_log_level in “groonga.h” for
more details of <cite>level</cite>.</p>
</dd></dl>
<dl class="c macro">
<dt id="c.GRN_PLUGIN_ERROR">
<code class="sig-name descname">GRN_PLUGIN_ERROR</code><span class="sig-paren">(</span><em>ctx</em>, <em>error_code</em>, ...<span class="sig-paren">)</span><a class="headerlink" href="#c.GRN_PLUGIN_ERROR" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>GRN_PLUGIN_ERROR() reports an error of <cite>error_code</cite>. Its error message is
generated from the varying number of arguments, in which the first one is the
format string and the rest are its arguments. See grn_rc in “groonga.h” for
more details of <cite>error_code</cite>.</p>
</dd></dl>
<dl class="c type">
<dt id="c.grn_plugin_mutex">
<em class="property">type </em><code class="sig-name descname">grn_plugin_mutex</code><a class="headerlink" href="#c.grn_plugin_mutex" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>grn_plugin_mutex is available to make a critical section. See the
following functions.</p>
</dd></dl>
<dl class="c function">
<dt id="c.grn_plugin_mutex_open">
<a class="reference internal" href="#c.grn_plugin_mutex" title="grn_plugin_mutex">grn_plugin_mutex</a> *<code class="sig-name descname">grn_plugin_mutex_open</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_plugin_mutex_open" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>grn_plugin_mutex_open() returns a pointer to a new object of
grn_plugin_mutex. Memory for the new object is obtained with
GRN_PLUGIN_MALLOC(). grn_plugin_mutex_open() returns NULL if sufficient
memory is not available.</p>
</dd></dl>
<dl class="c function">
<dt id="c.grn_plugin_mutex_close">
void <code class="sig-name descname">grn_plugin_mutex_close</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, <a class="reference internal" href="#c.grn_plugin_mutex" title="grn_plugin_mutex">grn_plugin_mutex</a> *<em>mutex</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_plugin_mutex_close" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>grn_plugin_mutex_close() finalizes an object of grn_plugin_mutex and then
frees memory allocated for that object.</p>
</dd></dl>
<dl class="c function">
<dt id="c.grn_plugin_mutex_lock">
void <code class="sig-name descname">grn_plugin_mutex_lock</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, <a class="reference internal" href="#c.grn_plugin_mutex" title="grn_plugin_mutex">grn_plugin_mutex</a> *<em>mutex</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_plugin_mutex_lock" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>grn_plugin_mutex_lock() locks a mutex object. If the object is already
locked, the calling thread waits until the object will be unlocked.</p>
</dd></dl>
<dl class="c function">
<dt id="c.grn_plugin_mutex_unlock">
void <code class="sig-name descname">grn_plugin_mutex_unlock</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, <a class="reference internal" href="#c.grn_plugin_mutex" title="grn_plugin_mutex">grn_plugin_mutex</a> *<em>mutex</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_plugin_mutex_unlock" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>grn_plugin_mutex_unlock() unlocks a mutex object. grn_plugin_mutex_unlock()
should not be called for an unlocked object.</p>
</dd></dl>
<dl class="c function">
<dt id="c.grn_plugin_proc_alloc">
<a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<code class="sig-name descname">grn_plugin_proc_alloc</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, <a class="reference internal" href="grn_user_data.html#c.grn_user_data" title="grn_user_data">grn_user_data</a> *<em>user_data</em>, grn_id <em>domain</em>, grn_obj_flags <em>flags</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_plugin_proc_alloc" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>grn_plugin_proc_alloc() allocates a <cite>grn_obj</cite> object.
You can use it in function that is registered as GRN_PROC_FUNCTION.</p>
</dd></dl>
<dl class="c function">
<dt id="c.grn_plugin_proc_get_var">
<a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> <code class="sig-name descname">grn_plugin_proc_get_var</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, <a class="reference internal" href="grn_user_data.html#c.grn_user_data" title="grn_user_data">grn_user_data</a> *<em>user_data</em>, <em class="property">const</em> char *<em>name</em>, int <em>name_size</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_plugin_proc_get_var" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>It gets a variable value from <cite>grn_user_data</cite> by specifying the variable name.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>name</strong> – The variable name.</p></li>
<li><p><strong>name_size</strong> – The number of bytes of name. If <cite>name_size</cite> is negative, <cite>name</cite> must be NUL-terminated. <cite>name_size</cite> is computed by <cite>strlen(name)</cite> for the case.</p></li>
</ul>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p>A variable value on success, NULL otherwise.</p>
</dd>
</dl>
</dd></dl>
<dl class="c function">
<dt id="c.grn_plugin_proc_get_var_by_offset">
<a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<code class="sig-name descname">grn_plugin_proc_get_var_by_offset</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, <a class="reference internal" href="grn_user_data.html#c.grn_user_data" title="grn_user_data">grn_user_data</a> *<em>user_data</em>, unsigned int <em>offset</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_plugin_proc_get_var_by_offset" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>It gets a variable value from <cite>grn_user_data</cite> by specifying the offset position of the variable.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>offset</strong> – The offset position of the variable.</p></li>
</ul>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p>A variable value on success, NULL otherwise.</p>
</dd>
</dl>
</dd></dl>
<dl class="c function">
<dt id="c.grn_plugin_win32_base_dir">
<em class="property">const</em> char *<code class="sig-name descname">grn_plugin_win32_base_dir</code><span class="sig-paren">(</span>void<span class="sig-paren">)</span><a class="headerlink" href="#c.grn_plugin_win32_base_dir" title="Permalink to this definition">¶</a><br /></dt>
<dd><div class="deprecated">
<p><span class="versionmodified deprecated">Deprecated since version 5.0.9.: </span>Use <a class="reference internal" href="#c.grn_plugin_windows_base_dir" title="grn_plugin_windows_base_dir"><code class="xref c c-func docutils literal notranslate"><span class="pre">grn_plugin_windows_base_dir()</span></code></a>
instead.</p>
</div>
<p>It returns the Groonga install directory. The install directory is
computed from the directory that has <code class="docutils literal notranslate"><span class="pre">groonga.dll</span></code>. You can use
the directory to generate install directory aware path. It only
works on Windows. It returns <code class="docutils literal notranslate"><span class="pre">NULL</span></code> on other platforms.</p>
</dd></dl>
<dl class="c function">
<dt id="c.grn_plugin_windows_base_dir">
<em class="property">const</em> char *<code class="sig-name descname">grn_plugin_windows_base_dir</code><span class="sig-paren">(</span>void<span class="sig-paren">)</span><a class="headerlink" href="#c.grn_plugin_windows_base_dir" title="Permalink to this definition">¶</a><br /></dt>
<dd><div class="versionadded">
<p><span class="versionmodified added">New in version 5.0.9.</span></p>
</div>
<p>It returns the Groonga install directory. The install directory is
computed from the directory that has <code class="docutils literal notranslate"><span class="pre">groonga.dll</span></code>. You can use
the directory to generate install directory aware path. It only
works on Windows. It returns <code class="docutils literal notranslate"><span class="pre">NULL</span></code> on other platforms.</p>
</dd></dl>
<dl class="c function">
<dt id="c.grn_plugin_charlen">
int <code class="sig-name descname">grn_plugin_charlen</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, <em class="property">const</em> char *<em>str_ptr</em>, unsigned int <em>str_length</em>, <a class="reference internal" href="grn_encoding.html#c.grn_encoding" title="grn_encoding">grn_encoding</a> <em>encoding</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_plugin_charlen" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>grn_plugin_charlen() returns the length (#bytes) of the first character
in the string specified by <cite>str_ptr</cite> and <cite>str_length</cite>. If the starting bytes
are invalid as a character, grn_plugin_charlen() returns 0. See
grn_encoding in “groonga.h” for more details of <cite>encoding</cite>.</p>
</dd></dl>
<dl class="c function">
<dt id="c.grn_plugin_isspace">
int <code class="sig-name descname">grn_plugin_isspace</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, <em class="property">const</em> char *<em>str_ptr</em>, unsigned int <em>str_length</em>, <a class="reference internal" href="grn_encoding.html#c.grn_encoding" title="grn_encoding">grn_encoding</a> <em>encoding</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_plugin_isspace" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>grn_plugin_isspace() returns the length (#bytes) of the first character
in the string specified by <cite>str_ptr</cite> and <cite>str_length</cite> if it is a space
character. Otherwise, grn_plugin_isspace() returns 0.</p>
</dd></dl>
<dl class="c function">
<dt id="c.grn_plugin_expr_var_init">
grn_rc <code class="sig-name descname">grn_plugin_expr_var_init</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, grn_expr_var *<em>var</em>, <em class="property">const</em> char *<em>name</em>, int <em>name_size</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_plugin_expr_var_init" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>It initializes a <cite>grn_expr_var</cite>.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>var</strong> – The pointer of <cite>grn_expr_var</cite> object to be initialized.</p></li>
<li><p><strong>name</strong> – The name of <cite>grn_expr_var</cite> object to be initialized.</p></li>
<li><p><strong>name_size</strong> – The number of bytes of name. If <cite>name_size</cite> is negative, <cite>name</cite> must be NUL-terminated. <cite>name_size</cite> is computed by <cite>strlen(name)</cite> for the case.</p></li>
</ul>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p><code class="docutils literal notranslate"><span class="pre">GRN_SUCCESS</span></code>. It doesn’t fail.</p>
</dd>
</dl>
</dd></dl>
<dl class="c function">
<dt id="c.grn_plugin_command_create">
<a class="reference internal" href="grn_obj.html#c.grn_obj" title="grn_obj">grn_obj</a> *<code class="sig-name descname">grn_plugin_command_create</code><span class="sig-paren">(</span><a class="reference internal" href="grn_ctx.html#c.grn_ctx" title="grn_ctx">grn_ctx</a> *<em>ctx</em>, <em class="property">const</em> char *<em>name</em>, int <em>name_size</em>, <a class="reference internal" href="grn_proc.html#c.grn_proc_func" title="grn_proc_func">grn_proc_func</a> <em>func</em>, unsigned int <em>n_vars</em>, grn_expr_var *<em>vars</em><span class="sig-paren">)</span><a class="headerlink" href="#c.grn_plugin_command_create" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>It creates a command.</p>
<dl class="field-list simple">
<dt class="field-odd">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>name</strong> – The <cite>proc</cite> name of the command to be created.</p></li>
<li><p><strong>name_size</strong> – The number of bytes of name. If <cite>name_size</cite> is negative, <cite>name</cite> must be NUL-terminated. <cite>name_size</cite> is computed by <cite>strlen(name)</cite> for the case.</p></li>
<li><p><strong>func</strong> – The function name to be called by the created command.</p></li>
<li><p><strong>n_vars</strong> – The number of the variables of the command to create.</p></li>
<li><p><strong>vars</strong> – The pointer of initialized <cite>grn_expr_var</cite> object.</p></li>
</ul>
</dd>
<dt class="field-even">Returns</dt>
<dd class="field-even"><p>The created command object if it creates a command successfully,
<cite>NULL</cite> otherwise. See <cite>ctx</cite> for error details.</p>
</dd>
</dl>
</dd></dl>
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