src/eric7/Documentation/Source/eric7.Utilities.BackgroundService.html

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<h1>eric7.Utilities.BackgroundService</h1>

<p>
Module implementing a background service for the various checkers and other
Python interpreter dependent functions.
</p>
<h3>Global Attributes</h3>

<table>
<tr><td>None</td></tr>
</table>
<h3>Classes</h3>

<table>

<tr>
<td><a href="#BackgroundService">BackgroundService</a></td>
<td>Class implementing the main part of the background service.</td>
</tr>
</table>
<h3>Functions</h3>

<table>
<tr><td>None</td></tr>
</table>
<hr />
<hr />
<a NAME="BackgroundService" ID="BackgroundService"></a>
<h2>BackgroundService</h2>

<p>
    Class implementing the main part of the background service.
</p>
<h3>Signals</h3>
<dl>

<dt>batchJobDone(function, language)</dt>
<dd>
emitted to indicate the end of
        a batch job (str, str)
</dd>
<dt>serviceNotAvailable(function, language, filename, message)</dt>
<dd>
        emitted to indicate the non-availability of a service function
        (str, str, str, str)
</dd>
</dl>
<h3>Derived from</h3>
QTcpServer
<h3>Class Attributes</h3>

<table>
<tr><td>None</td></tr>
</table>
<h3>Class Methods</h3>

<table>
<tr><td>None</td></tr>
</table>
<h3>Methods</h3>

<table>

<tr>
<td><a href="#BackgroundService.__init__">BackgroundService</a></td>
<td>Constructor</td>
</tr>
<tr>
<td><a href="#BackgroundService.__getPythonInterpreter">__getPythonInterpreter</a></td>
<td>Private method to generate the path of the Python interpreter to be used to run the background client.</td>
</tr>
<tr>
<td><a href="#BackgroundService.__processQueue">__processQueue</a></td>
<td>Private method to take the next service request and send it to the client.</td>
</tr>
<tr>
<td><a href="#BackgroundService.__receive">__receive</a></td>
<td>Private method to receive the response from the clients.</td>
</tr>
<tr>
<td><a href="#BackgroundService.__send">__send</a></td>
<td>Private method to send a job request to one of the clients.</td>
</tr>
<tr>
<td><a href="#BackgroundService.__startExternalClient">__startExternalClient</a></td>
<td>Private method to start the background client as external process.</td>
</tr>
<tr>
<td><a href="#BackgroundService.enqueueRequest">enqueueRequest</a></td>
<td>Public method implementing a queued processing of incoming events.</td>
</tr>
<tr>
<td><a href="#BackgroundService.on_disconnectSocket">on_disconnectSocket</a></td>
<td>Private slot called when connection to a client is lost.</td>
</tr>
<tr>
<td><a href="#BackgroundService.on_newConnection">on_newConnection</a></td>
<td>Private slot for new incoming connections from the clients.</td>
</tr>
<tr>
<td><a href="#BackgroundService.preferencesOrProjectChanged">preferencesOrProjectChanged</a></td>
<td>Public slot to restart the built in languages.</td>
</tr>
<tr>
<td><a href="#BackgroundService.requestCancel">requestCancel</a></td>
<td>Public method to ask a batch job to terminate.</td>
</tr>
<tr>
<td><a href="#BackgroundService.restartService">restartService</a></td>
<td>Public method to restart a given language.</td>
</tr>
<tr>
<td><a href="#BackgroundService.serviceConnect">serviceConnect</a></td>
<td>Public method to announce a new service to the background service/client.</td>
</tr>
<tr>
<td><a href="#BackgroundService.serviceDisconnect">serviceDisconnect</a></td>
<td>Public method to remove the service from the service list.</td>
</tr>
<tr>
<td><a href="#BackgroundService.shutdown">shutdown</a></td>
<td>Public method to cleanup the connections and processes when eric is shutting down.</td>
</tr>
</table>
<h3>Static Methods</h3>

<table>
<tr><td>None</td></tr>
</table>

<a NAME="BackgroundService.__init__" ID="BackgroundService.__init__"></a>
<h4>BackgroundService (Constructor)</h4>
<b>BackgroundService</b>(<i>parent=None</i>)

<p>
        Constructor
</p>
<dl>

<dt><i>parent</i> (QObject)</dt>
<dd>
reference to the parent object
</dd>
</dl>
<a NAME="BackgroundService.__getPythonInterpreter" ID="BackgroundService.__getPythonInterpreter"></a>
<h4>BackgroundService.__getPythonInterpreter</h4>
<b>__getPythonInterpreter</b>(<i></i>)

<p>
        Private method to generate the path of the Python interpreter to be
        used to run the background client.
</p>
<dl>
<dt>Return:</dt>
<dd>
path of the Python interpreter
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
str
</dd>
</dl>
<a NAME="BackgroundService.__processQueue" ID="BackgroundService.__processQueue"></a>
<h4>BackgroundService.__processQueue</h4>
<b>__processQueue</b>(<i></i>)

<p>
        Private method to take the next service request and send it to the
        client.
</p>
<a NAME="BackgroundService.__receive" ID="BackgroundService.__receive"></a>
<h4>BackgroundService.__receive</h4>
<b>__receive</b>(<i>lang</i>)

<p>
        Private method to receive the response from the clients.
</p>
<dl>

<dt><i>lang</i> (str)</dt>
<dd>
language of the incoming connection
</dd>
</dl>
<dl>

<dt>Raises <b>RuntimeError</b>:</dt>
<dd>
raised if hashes don't match
</dd>
</dl>
<a NAME="BackgroundService.__send" ID="BackgroundService.__send"></a>
<h4>BackgroundService.__send</h4>
<b>__send</b>(<i>fx, lang, fn, data</i>)

<p>
        Private method to send a job request to one of the clients.
</p>
<dl>

<dt><i>fx</i> (str)</dt>
<dd>
remote function name to execute
</dd>
<dt><i>lang</i> (str)</dt>
<dd>
language to connect to
</dd>
<dt><i>fn</i> (str)</dt>
<dd>
filename for identification
</dd>
<dt><i>data</i> (any basic datatype)</dt>
<dd>
function argument(s)
</dd>
</dl>
<a NAME="BackgroundService.__startExternalClient" ID="BackgroundService.__startExternalClient"></a>
<h4>BackgroundService.__startExternalClient</h4>
<b>__startExternalClient</b>(<i>interpreter, port</i>)

<p>
        Private method to start the background client as external process.
</p>
<dl>

<dt><i>interpreter</i> (str)</dt>
<dd>
path and name of the executable to start
</dd>
<dt><i>port</i> (int)</dt>
<dd>
socket port to which the interpreter should connect
</dd>
</dl>
<dl>
<dt>Return:</dt>
<dd>
the process object
</dd>
</dl>
<dl>
<dt>Return Type:</dt>
<dd>
QProcess or None
</dd>
</dl>
<a NAME="BackgroundService.enqueueRequest" ID="BackgroundService.enqueueRequest"></a>
<h4>BackgroundService.enqueueRequest</h4>
<b>enqueueRequest</b>(<i>fx, lang, fn, data</i>)

<p>
        Public method implementing a queued processing of incoming events.
</p>
<p>
        Duplicate service requests update an older request to avoid overrun or
        starving of the services.
</p>
<dl>

<dt><i>fx</i> (str)</dt>
<dd>
function name of the service
</dd>
<dt><i>lang</i> (str)</dt>
<dd>
language to connect to
</dd>
<dt><i>fn</i> (str)</dt>
<dd>
filename for identification
</dd>
<dt><i>data</i> (any basic datatype)</dt>
<dd>
function argument(s)
</dd>
</dl>
<a NAME="BackgroundService.on_disconnectSocket" ID="BackgroundService.on_disconnectSocket"></a>
<h4>BackgroundService.on_disconnectSocket</h4>
<b>on_disconnectSocket</b>(<i>lang</i>)

<p>
        Private slot called when connection to a client is lost.
</p>
<dl>

<dt><i>lang</i> (str)</dt>
<dd>
client language which connection is lost
</dd>
</dl>
<a NAME="BackgroundService.on_newConnection" ID="BackgroundService.on_newConnection"></a>
<h4>BackgroundService.on_newConnection</h4>
<b>on_newConnection</b>(<i></i>)

<p>
        Private slot for new incoming connections from the clients.
</p>
<a NAME="BackgroundService.preferencesOrProjectChanged" ID="BackgroundService.preferencesOrProjectChanged"></a>
<h4>BackgroundService.preferencesOrProjectChanged</h4>
<b>preferencesOrProjectChanged</b>(<i></i>)

<p>
        Public slot to restart the built in languages.
</p>
<a NAME="BackgroundService.requestCancel" ID="BackgroundService.requestCancel"></a>
<h4>BackgroundService.requestCancel</h4>
<b>requestCancel</b>(<i>fx, lang</i>)

<p>
        Public method to ask a batch job to terminate.
</p>
<dl>

<dt><i>fx</i> (str)</dt>
<dd>
function name of the service
</dd>
<dt><i>lang</i> (str)</dt>
<dd>
language to connect to
</dd>
</dl>
<a NAME="BackgroundService.restartService" ID="BackgroundService.restartService"></a>
<h4>BackgroundService.restartService</h4>
<b>restartService</b>(<i>language, forceKill=False</i>)

<p>
        Public method to restart a given language.
</p>
<dl>

<dt><i>language</i> (str)</dt>
<dd>
to restart
</dd>
<dt><i>forceKill</i> (bool)</dt>
<dd>
flag to kill a running task
</dd>
</dl>
<a NAME="BackgroundService.serviceConnect" ID="BackgroundService.serviceConnect"></a>
<h4>BackgroundService.serviceConnect</h4>
<b>serviceConnect</b>(<i>fx, lang, modulepath, module, callback, onErrorCallback=None, onBatchDone=None, </i>)

<p>
        Public method to announce a new service to the background
        service/client.
</p>
<dl>

<dt><i>fx</i> (str)</dt>
<dd>
function name of the service
</dd>
<dt><i>lang</i> (str)</dt>
<dd>
language of the new service
</dd>
<dt><i>modulepath</i> (str)</dt>
<dd>
full path to the module
</dd>
<dt><i>module</i> (str)</dt>
<dd>
name to import
</dd>
<dt><i>callback</i> (function)</dt>
<dd>
function called on service response
</dd>
<dt><i>onErrorCallback</i></dt>
<dd>
function called, if client isn't available
            (function)
</dd>
<dt><i>onBatchDone</i> (function)</dt>
<dd>
function called when a batch job is done
</dd>
</dl>
<a NAME="BackgroundService.serviceDisconnect" ID="BackgroundService.serviceDisconnect"></a>
<h4>BackgroundService.serviceDisconnect</h4>
<b>serviceDisconnect</b>(<i>fx, lang</i>)

<p>
        Public method to remove the service from the service list.
</p>
<dl>

<dt><i>fx</i> (function)</dt>
<dd>
function name of the service
</dd>
<dt><i>lang</i> (str)</dt>
<dd>
language of the service
</dd>
</dl>
<a NAME="BackgroundService.shutdown" ID="BackgroundService.shutdown"></a>
<h4>BackgroundService.shutdown</h4>
<b>shutdown</b>(<i></i>)

<p>
        Public method to cleanup the connections and processes when eric is
        shutting down.
</p>
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