From d1eaab771110ae2ce2ebe9cf1689e6c6d06ea1e3 Mon Sep 17 00:00:00 2001
From: Jakob Ketterl <jakob.ketterl@gmx.de>
Date: Sat, 3 Aug 2019 23:44:56 +0200
Subject: [PATCH] delay startup of background services to increase user
 interface response

---
 owrx/service.py | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/owrx/service.py b/owrx/service.py
index b6c2731..d04ee0b 100644
--- a/owrx/service.py
+++ b/owrx/service.py
@@ -30,12 +30,13 @@ class ServiceHandler(object):
     def __init__(self, source):
         self.services = []
         self.source = source
+        self.startupTimer = None
         self.source.addClient(self)
         self.source.getProps().collect("center_freq", "samp_rate").wire(self.onFrequencyChange)
-        self.updateServices()
+        self.scheduleServiceStartup()
 
     def onSdrAvailable(self):
-        self.updateServices()
+        self.scheduleServiceStartup()
 
     def onSdrUnavailable(self):
         self.stopServices()
@@ -54,9 +55,16 @@ class ServiceHandler(object):
             service.start()
 
     def onFrequencyChange(self, key, value):
+        self.stopServices()
         if not self.source.isAvailable():
             return
-        self.updateServices()
+        self.scheduleServiceStartup()
+
+    def scheduleServiceStartup(self):
+        if self.startupTimer:
+            self.startupTimer.cancel()
+        self.startupTimer = threading.Timer(10, self.updateServices)
+        self.startupTimer.start()
 
     def updateServices(self):
         logger.debug("re-scheduling services due to sdr changes")