From 82a6493facb2fac5ca35a68052610bffbade971c Mon Sep 17 00:00:00 2001
From: Samuel Gaist <samuel.gaist@idiap.ch>
Date: Fri, 5 Oct 2018 14:24:06 +0200
Subject: [PATCH] [executor] Fix lazy loading of algorithm's runner

---
 beat/backend/python/executor.py | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/beat/backend/python/executor.py b/beat/backend/python/executor.py
index ce1f722..bbd6b9a 100644
--- a/beat/backend/python/executor.py
+++ b/beat/backend/python/executor.py
@@ -92,7 +92,7 @@ class Executor(object):
             self.data = simplejson.loads(f.read().decode('utf-8'))
 
         self.prefix = os.path.join(directory, 'prefix')
-        self.runner = None
+        self._runner = None
 
         # Temporary caches, if the user has not set them, for performance
         database_cache = database_cache if database_cache is not None else {}
@@ -134,10 +134,21 @@ class Executor(object):
             )
 
 
+    @property
+    def runner(self):
+        """Returns the algorithm runner
+
+        This property allows for lazy loading of the runner
+        """
+
+        if self._runner is None:
+            self._runner = self.algorithm.runner()
+        return self._runner
+
+
     def setup(self):
         """Sets up the algorithm to start processing"""
 
-        self.runner = self.algorithm.runner()
         retval = self.runner.setup(self.data['parameters'])
         logger.debug("User algorithm is setup")
         return retval
@@ -146,7 +157,6 @@ class Executor(object):
     def prepare(self):
         """Prepare the algorithm"""
 
-        self.runner = self.algorithm.runner()
         retval = self.runner.prepare(self.data_loaders)
         logger.debug("User algorithm is prepared")
         return retval
-- 
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