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+<title>eric5.Utilities.BackgroundService</title>
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+<h1>eric5.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>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 of the BackgroundService class.</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.__startInternalClient">__startInternalClient</a></td>
+<td>Private method to start the background client as internal thread.</td>
+</tr><tr>
+<td><a href="#BackgroundService.enqueueRequest">enqueueRequest</a></td>
+<td>Implement a queued processing of incomming events.</td>
+</tr><tr>
+<td><a href="#BackgroundService.on_disconnectSocket">on_disconnectSocket</a></td>
+<td>Slot when connection to a client is lost.</td>
+</tr><tr>
+<td><a href="#BackgroundService.on_newConnection">on_newConnection</a></td>
+<td>Slot for new incomming connections from the clients.</td>
+</tr><tr>
+<td><a href="#BackgroundService.serviceConnect">serviceConnect</a></td>
+<td>Announce a new service to the background service/ client.</td>
+</tr><tr>
+<td><a href="#BackgroundService.serviceDisconnect">serviceDisconnect</a></td>
+<td>Remove the service from the service list.</td>
+</tr><tr>
+<td><a href="#BackgroundService.shutdown">shutdown</a></td>
+<td>Cleanup the connections and processes when Eric is shuting 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></i>)
+<p>
+        Constructor of the BackgroundService class.
+</p><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></dt>
+<dd>
+language of the incomming connection (str)
+</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></dt>
+<dd>
+remote function name to execute (str)
+</dd><dt><i>lang</i></dt>
+<dd>
+language to connect to (str)
+</dd><dt><i>fn</i></dt>
+<dd>
+filename for identification (str)
+</dd><dt><i>data</i></dt>
+<dd>
+function argument(s) (any basic datatype)
+</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></dt>
+<dd>
+path and name of the executable to start (string)
+</dd><dt><i>port</i></dt>
+<dd>
+socket port to which the interpreter should connect (int)
+</dd>
+</dl><dl>
+<dt>Returns:</dt>
+<dd>
+the process object (QProcess or None)
+</dd>
+</dl><a NAME="BackgroundService.__startInternalClient" ID="BackgroundService.__startInternalClient"></a>
+<h4>BackgroundService.__startInternalClient</h4>
+<b>__startInternalClient</b>(<i>port</i>)
+<p>
+        Private method to start the background client as internal thread.
+</p><dl>
+<dt><i>port</i></dt>
+<dd>
+socket port to which the interpreter should connect (int)
+</dd>
+</dl><dl>
+<dt>Returns:</dt>
+<dd>
+the thread object (Thread) 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>
+        Implement a queued processing of incomming events.
+</p><p>
+        Dublicate service requests updates an older request to avoid overrun or
+        starving of the services.
+</p><dl>
+<dt><i>fx</i></dt>
+<dd>
+function name of the service (str)
+</dd><dt><i>lang</i></dt>
+<dd>
+language to connect to (str)
+</dd><dt><i>fn</i></dt>
+<dd>
+filename for identification (str)
+</dd><dt><i>data</i></dt>
+<dd>
+function argument(s) (any basic datatype(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>
+        Slot when connection to a client is lost.
+</p><dl>
+<dt><i>lang</i></dt>
+<dd>
+client language which connection is lost (str)
+</dd>
+</dl><a NAME="BackgroundService.on_newConnection" ID="BackgroundService.on_newConnection"></a>
+<h4>BackgroundService.on_newConnection</h4>
+<b>on_newConnection</b>(<i></i>)
+<p>
+        Slot for new incomming connections from the clients.
+</p><a NAME="BackgroundService.serviceConnect" ID="BackgroundService.serviceConnect"></a>
+<h4>BackgroundService.serviceConnect</h4>
+<b>serviceConnect</b>(<i>fx, lang, modulepath, module, callback, onErrorCallback=None</i>)
+<p>
+        Announce a new service to the background service/ client.
+</p><dl>
+<dt><i>fx</i></dt>
+<dd>
+function name of the service (str)
+</dd><dt><i>lang</i></dt>
+<dd>
+language of the new service (str)
+</dd><dt><i>modulepath</i></dt>
+<dd>
+full path to the module (str)
+</dd><dt><i>module</i></dt>
+<dd>
+name to import (str)
+</dd><dt><i>callback</i></dt>
+<dd>
+function on service response (function)
+</dd><dt><i>onErrorCallback</i></dt>
+<dd>
+function if client isn't available (function)
+</dd>
+</dl><a NAME="BackgroundService.serviceDisconnect" ID="BackgroundService.serviceDisconnect"></a>
+<h4>BackgroundService.serviceDisconnect</h4>
+<b>serviceDisconnect</b>(<i>fx, lang</i>)
+<p>
+        Remove the service from the service list.
+</p><dl>
+<dt><i>fx</i></dt>
+<dd>
+function name of the service (function)
+</dd><dt><i>lang</i></dt>
+<dd>
+language of the service (str)
+</dd>
+</dl><a NAME="BackgroundService.shutdown" ID="BackgroundService.shutdown"></a>
+<h4>BackgroundService.shutdown</h4>
+<b>shutdown</b>(<i></i>)
+<p>
+        Cleanup the connections and processes when Eric is shuting down.
+</p>
+<div align="right"><a href="#top">Up</a></div>
+<hr />
+</body></html>
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