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<a href="dbus-module.html">Package dbus</a> ::
Module service
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<!-- ==================== MODULE DESCRIPTION ==================== -->
<h1 class="epydoc">Module service</h1><p class="nomargin-top"><span class="codelink"><a href="dbus.service-pysrc.html">source code</a></span></p>
<!-- ==================== CLASSES ==================== -->
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<span class="summary-type"> </span>
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<a href="dbus.service._VariantSignature-class.html" class="summary-name" onclick="show_private();">_VariantSignature</a><br />
A fake method signature which, when iterated, yields an endless stream
of 'v' characters representing variants (handy with zip()).
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<span class="summary-type"> </span>
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<a href="dbus.service.BusName-class.html" class="summary-name">BusName</a><br />
A base class for exporting your own Named Services across the Bus.
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<span class="summary-type"> </span>
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<span class="summary-type"> </span>
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<a href="dbus.service.Interface-class.html" class="summary-name" onclick="show_private();">Interface</a>
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<a href="dbus.service.Object-class.html" class="summary-name">Object</a><br />
A base class for exporting your own Objects across the Bus.
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<a href="dbus.service.FallbackObject-class.html" class="summary-name" onclick="show_private();">FallbackObject</a><br />
An object that implements an entire subtree of the object-path
tree.
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<!-- ==================== FUNCTIONS ==================== -->
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<td><span class="summary-sig"><a href="dbus.service-module.html#method" class="summary-sig-name">method</a>(<span class="summary-sig-arg">dbus_interface</span>,
<span class="summary-sig-arg">in_signature</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">out_signature</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">async_callbacks</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">sender_keyword</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">path_keyword</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">destination_keyword</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">message_keyword</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">connection_keyword</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">byte_arrays</span>=<span class="summary-sig-default">False</span>,
<span class="summary-sig-arg">rel_path_keyword</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">**kwargs</span>)</span><br />
Factory for decorators used to mark methods of a <a href="dbus.service.Object-class.html" class="link">dbus.service.Object</a>
to be exported on the D-Bus.</td>
<td align="right" valign="top">
<span class="codelink"><a href="dbus.decorators-pysrc.html#method">source code</a></span>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="dbus.service-module.html#signal" class="summary-sig-name">signal</a>(<span class="summary-sig-arg">dbus_interface</span>,
<span class="summary-sig-arg">signature</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">path_keyword</span>=<span class="summary-sig-default">None</span>,
<span class="summary-sig-arg">rel_path_keyword</span>=<span class="summary-sig-default">None</span>)</span><br />
Factory for decorators used to mark methods of a <a href="dbus.service.Object-class.html" class="link">dbus.service.Object</a>
to emit signals on the D-Bus.</td>
<td align="right" valign="top">
<span class="codelink"><a href="dbus.decorators-pysrc.html#signal">source code</a></span>
</td>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a href="dbus.service-module.html#_method_lookup" class="summary-sig-name" onclick="show_private();">_method_lookup</a>(<span class="summary-sig-arg">self</span>,
<span class="summary-sig-arg">method_name</span>,
<span class="summary-sig-arg">dbus_interface</span>)</span><br />
Walks the Python MRO of the given class to find the method to invoke.</td>
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<span class="codelink"><a href="dbus.service-pysrc.html#_method_lookup">source code</a></span>
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<td><span class="summary-sig"><a name="_method_reply_return"></a><span class="summary-sig-name">_method_reply_return</span>(<span class="summary-sig-arg">connection</span>,
<span class="summary-sig-arg">message</span>,
<span class="summary-sig-arg">method_name</span>,
<span class="summary-sig-arg">signature</span>,
<span class="summary-sig-arg">*retval</span>)</span></td>
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<span class="codelink"><a href="dbus.service-pysrc.html#_method_reply_return">source code</a></span>
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<span class="summary-type"> </span>
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<td><span class="summary-sig"><a name="_method_reply_error"></a><span class="summary-sig-name">_method_reply_error</span>(<span class="summary-sig-arg">connection</span>,
<span class="summary-sig-arg">message</span>,
<span class="summary-sig-arg">exception</span>)</span></td>
<td align="right" valign="top">
<span class="codelink"><a href="dbus.service-pysrc.html#_method_reply_error">source code</a></span>
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<!-- ==================== VARIABLES ==================== -->
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<span class="summary-type"> </span>
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<a name="_logger"></a><span class="summary-name">_logger</span> = <code title="logging.getLogger('dbus.service')">logging.getLogger('dbus.service')</code>
</td>
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<span class="summary-type"> </span>
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<a name="_MANY"></a><span class="summary-name">_MANY</span> = <code title="object()">object()</code><br />
A unique object used as the value of Object._object_path and
Object._connection if it's actually in more than one place
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<span class="summary-type"> </span>
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<a name="__package__"></a><span class="summary-name">__package__</span> = <code title="'dbus'"><code class="variable-quote">'</code><code class="variable-string">dbus</code><code class="variable-quote">'</code></code>
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<!-- ==================== FUNCTION DETAILS ==================== -->
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<td align="left"><span class="table-header">Function Details</span></td>
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<a name="method"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">method</span>(<span class="sig-arg">dbus_interface</span>,
<span class="sig-arg">in_signature</span>=<span class="sig-default">None</span>,
<span class="sig-arg">out_signature</span>=<span class="sig-default">None</span>,
<span class="sig-arg">async_callbacks</span>=<span class="sig-default">None</span>,
<span class="sig-arg">sender_keyword</span>=<span class="sig-default">None</span>,
<span class="sig-arg">path_keyword</span>=<span class="sig-default">None</span>,
<span class="sig-arg">destination_keyword</span>=<span class="sig-default">None</span>,
<span class="sig-arg">message_keyword</span>=<span class="sig-default">None</span>,
<span class="sig-arg">connection_keyword</span>=<span class="sig-default">None</span>,
<span class="sig-arg">byte_arrays</span>=<span class="sig-default">False</span>,
<span class="sig-arg">rel_path_keyword</span>=<span class="sig-default">None</span>,
<span class="sig-arg">**kwargs</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="dbus.decorators-pysrc.html#method">source code</a></span>
</td>
</tr></table>
<p>Factory for decorators used to mark methods of a <a href="dbus.service.Object-class.html" class="link">dbus.service.Object</a>
to be exported on the D-Bus.</p>
<p>The decorated method will be exported over D-Bus as the method of the
same name on the given D-Bus interface.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>dbus_interface</code></strong> (str) - Name of a D-Bus interface</li>
<li><strong class="pname"><code>in_signature</code></strong> (str or None) - If not None, the signature of the method parameters in the usual
D-Bus notation</li>
<li><strong class="pname"><code>out_signature</code></strong> (str or None) - If not None, the signature of the return value in the usual
D-Bus notation</li>
<li><p><strong class="pname"><code>async_callbacks</code></strong> (tuple containing (str,str), or None) - If None (default) the decorated method is expected to return
values matching the <code class="link">out_signature</code> as usual, or raise
an exception on error. If not None, the following applies:</p>
<p><code class="link">async_callbacks</code> contains the names of two keyword arguments to
the decorated function, which will be used to provide a success
callback and an error callback (in that order).</p>
<p>When the decorated method is called via the D-Bus, its normal
return value will be ignored; instead, a pair of callbacks are
passed as keyword arguments, and the decorated method is
expected to arrange for one of them to be called.</p>
<p>On success the success callback must be called, passing the
results of this method as positional parameters in the format
given by the <code class="link">out_signature</code>.</p>
<p>On error the decorated method may either raise an exception
before it returns, or arrange for the error callback to be
called with an Exception instance as parameter.</p></li>
<li><strong class="pname"><code>sender_keyword</code></strong> (str or None) - If not None, contains the name of a keyword argument to the
decorated function, conventionally <tt class="rst-rst-docutils literal rst-docutils literal">'sender'</tt>. When the
method is called, the sender's unique name will be passed as
this keyword argument.</li>
<li><p><strong class="pname"><code>path_keyword</code></strong> (str or None) - If not None (the default), the decorated method will receive
the destination object path as a keyword argument with this
name. Normally you already know the object path, but in the
case of "fallback paths" you'll usually want to use the object
path in the method's implementation.</p>
<p>For fallback objects, <code class="link">rel_path_keyword</code> (new in 0.82.2) is
likely to be more useful.</p></li>
<li><strong class="pname"><code>rel_path_keyword</code></strong> (str or None) - If not None (the default), the decorated method will receive
the destination object path, relative to the path at which the
object was exported, as a keyword argument with this
name. For non-fallback objects the relative path will always be
'/'.</li>
<li><strong class="pname"><code>destination_keyword</code></strong> (str or None) - If not None (the default), the decorated method will receive
the destination bus name as a keyword argument with this name.
Included for completeness - you shouldn't need this.</li>
<li><strong class="pname"><code>message_keyword</code></strong> (str or None) - If not None (the default), the decorated method will receive
the <a href="dbus.lowlevel.MethodCallMessage-class.html" class="link">dbus.lowlevel.MethodCallMessage</a> as a keyword argument
with this name.</li>
<li><strong class="pname"><code>connection_keyword</code></strong> (str or None) - If not None (the default), the decorated method will receive
the <a href="dbus.connection.Connection-class.html" class="link">dbus.connection.Connection</a> as a keyword argument
with this name. This is generally only useful for objects
that are available on more than one connection.</li>
<li><p><strong class="pname"><code>utf8_strings</code></strong> (bool) - If False (default), D-Bus strings are passed to the decorated
method as objects of class dbus.String, a unicode subclass.</p>
<p>If True, D-Bus strings are passed to the decorated method
as objects of class dbus.UTF8String, a str subclass guaranteed
to be encoded in UTF-8.</p>
<p>This option does not affect object-paths and signatures, which
are always 8-bit strings (str subclass) encoded in ASCII.</p></li>
<li><p><strong class="pname"><code>byte_arrays</code></strong> (bool) - If False (default), a byte array will be passed to the decorated
method as an <a href="dbus.Array-class.html" class="link">Array</a> (a list subclass) of <a href="dbus.Byte-class.html" class="link">Byte</a> objects.</p>
<p>If True, a byte array will be passed to the decorated method as
a <a href="dbus.ByteArray-class.html" class="link">ByteArray</a>, a str subclass. This is usually what you want,
but is switched off by default to keep dbus-python's API
consistent.</p></li>
</ul></dd>
</dl>
<div class="fields"> <strong>Since:</strong>
<ul class="nomargin-top">
<li>
0.80.0?
</li>
<li>
0.82.2
</li>
<li>
0.80.0?
</li>
<li>
0.80.0?
</li>
<li>
0.82.0
</li>
<li>
0.80.0
</li>
<li>
0.80.0
</li>
</ul>
</div></td></tr></table>
</div>
<a name="signal"></a>
<div>
<table class="details" border="1" cellpadding="3"
cellspacing="0" width="100%" bgcolor="white">
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<table width="100%" cellpadding="0" cellspacing="0" border="0">
<tr valign="top"><td>
<h3 class="epydoc"><span class="sig"><span class="sig-name">signal</span>(<span class="sig-arg">dbus_interface</span>,
<span class="sig-arg">signature</span>=<span class="sig-default">None</span>,
<span class="sig-arg">path_keyword</span>=<span class="sig-default">None</span>,
<span class="sig-arg">rel_path_keyword</span>=<span class="sig-default">None</span>)</span>
</h3>
</td><td align="right" valign="top"
><span class="codelink"><a href="dbus.decorators-pysrc.html#signal">source code</a></span>
</td>
</tr></table>
<p>Factory for decorators used to mark methods of a <a href="dbus.service.Object-class.html" class="link">dbus.service.Object</a>
to emit signals on the D-Bus.</p>
<p>Whenever the decorated method is called in Python, after the method
body is executed, a signal with the same name as the decorated method,
with the given D-Bus interface, will be emitted from this object.</p>
<dl class="fields">
<dt>Parameters:</dt>
<dd><ul class="nomargin-top">
<li><strong class="pname"><code>dbus_interface</code></strong> (str) - The D-Bus interface whose signal is emitted</li>
<li><strong class="pname"><code>signature</code></strong> (str) - The signature of the signal in the usual D-Bus notation</li>
<li><p><strong class="pname"><code>path_keyword</code></strong> (str or None) - A keyword argument to the decorated method. If not None,
that argument will not be emitted as an argument of
the signal, and when the signal is emitted, it will appear
to come from the object path given by the keyword argument.</p>
<p>Note that when calling the decorated method, you must always
pass in the object path as a keyword argument, not as a
positional argument.</p>
<p>This keyword argument cannot be used on objects where
the class attribute <tt class="rst-rst-docutils literal rst-docutils literal">SUPPORTS_MULTIPLE_OBJECT_PATHS</tt> is true.</p></li>
<li><p><strong class="pname"><code>rel_path_keyword</code></strong> (str or None) - A keyword argument to the decorated method. If not None,
that argument will not be emitted as an argument of
the signal.</p>
<p>When the signal is emitted, if the named keyword argument is given,
the signal will appear to come from the object path obtained by
appending the keyword argument to the object's object path.
This is useful to implement "fallback objects" (objects which
own an entire subtree of the object-path tree).</p>
<p>If the object is available at more than one object-path on the
same or different connections, the signal will be emitted at
an appropriate object-path on each connection - for instance,
if the object is exported at /abc on connection 1 and at
/def and /x/y/z on connection 2, and the keyword argument is
/foo, then signals will be emitted from /abc/foo and /def/foo
on connection 1, and /x/y/z/foo on connection 2.</p></li>
</ul></dd>
</dl>
<div class="fields"> <p><strong>Deprecated:</strong>
since 0.82.0. Use <code class="link">rel_path_keyword</code> instead.
</p>
<p><strong>Since:</strong>
0.82.0
</p>
</div></td></tr></table>
</div>
<a name="_method_lookup"></a>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">_method_lookup</span>(<span class="sig-arg">self</span>,
<span class="sig-arg">method_name</span>,
<span class="sig-arg">dbus_interface</span>)</span>
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><span class="codelink"><a href="dbus.service-pysrc.html#_method_lookup">source code</a></span>
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<p>Walks the Python MRO of the given class to find the method to invoke.</p>
<p>Returns two methods, the one to call, and the one it inherits from which
defines its D-Bus interface name, signature, and attributes.</p>
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